Original instructions

BG00602127 en-US D.001.1 2018-08-28

HL 820T, HF 820T Rock drill

operation, maintenance and repair
instructions
HL 820T, HF 820T Rock drill operation, maintenance and repair
instructions

WARNING
IGNORING INSTRUCTIONS HAZARD!
To avoid death or injury you MUST read, understand and follow
operator's and maintenance manuals before installing, inspecting,
operating, servicing, testing, cleaning, transporting, storing,
dismantling or disposing of the product or a part or accessory of the
product. Keep this publication for future reference.

Copyright © Sandvik
ID: BG00602127 en-US D.001.1 2018-08-28
HL 820T, HF 820T Rock drill operation, maintenance and repair
instructions

This page is intentionally left blank

Copyright © Sandvik
ID: BG00602127 en-US D.001.1 2018-08-28
HL 820T, HF 820T Rock drill operation, maintenance and repair
instructions

Table of Contents

1 Introduction ................................................................... 7
1.1 The Purpose of these instructions ......................................................7
1.1.1 Validity of the manuals ................................................................ 7

2 Safety and environmental instructions .......................9

2.1 Safety precautions ................................................................................9
2.2 Lifting instructions ............................................................................... 9
2.3 Disposal .................................................................................................11

3 Rock drill main components ........................................ 13

3.1 Main components ................................................................................. 13
3.2 Lubrication circulation ......................................................................... 13
3.2.1 Percussion mechanism and rotation motor ................................. 13
3.2.2 Shank lubrication circulation ........................................................14

4 Rock drill operation ...................................................... 17

4.1 Lifting points ......................................................................................... 17
4.2 Taking a new rock drill in use ..............................................................20
4.2.1 Preparations ................................................................................ 20
4.3 Hose connections .................................................................................21
4.4 Test run ..................................................................................................21
4.4.1 Warming the hydraulic oil before the test run .............................. 23
4.4.2 Performing the test run ................................................................24

5 Rock drill maintenance instructions ........................... 27

5.1 Scheduled maintenance .......................................................................27
5.2 Tools needed for on-site maintenance ............................................... 27
5.3 Daily maintenance ................................................................................ 27
5.3.1 Hydraulic rock drill HL 820T, HF 820T .........................................27
5.4 Periodic maintenance ...........................................................................28
5.4.1 Before replacing the bushings and bearings ............................... 28
5.4.2 Hydraulic rock drill HL 820T, HF 820T .........................................29
5.5 Service follow-up .................................................................................. 50
5.6 HL 820T, HF 820T rock drill overhaul .................................................. 51
5.6.1 Repair facilities ............................................................................ 51
5.6.2 Rock drill overhaul instructions ....................................................52
5.6.3 Attaching the rock drill to the assembly stand ............................. 53
5.6.4 Removing the flushing device ..................................................... 53
5.6.5 Detaching the pressure accumulators .........................................54
5.6.6 Detaching the hydraulic motor .....................................................55

Copyright © Sandvik
ID: BG00602127 en-US D.001.1 2018-08-28
HL 820T, HF 820T Rock drill operation, maintenance and repair
instructions

5.6.7 Detaching the side bolts .............................................................. 57

5.6.8 Turning the assembly stand to a vertical position ........................58
5.6.9 Detaching the rear cover ............................................................. 59
5.6.10 Detaching the percussion cartridge .............................................60
5.6.11 Disassembling the percussion cartridge ......................................60
5.6.12 Detaching the body ..................................................................... 63
5.6.13 Detaching the front cylinder .........................................................63
5.6.14 Turning the assembly stand to a horizontal position ................... 64
5.6.15 Detaching the stabilizer spacer ................................................... 65
5.6.16 Disassembling the gear housing ................................................. 73
5.6.17 Checking the body and rear cover .............................................. 80
5.6.18 Checking the gear housing ..........................................................81
5.6.19 Wear limits and wear parts ..........................................................82
5.6.20 Assembly .....................................................................................84
5.6.21 Assembling the gear housing ...................................................... 86
5.6.22 Installing the spacing ring and stabilizer pistons ......................... 88
5.6.23 Installing the stabilizer spacer ..................................................... 89
5.6.24 Installing the body ....................................................................... 91
5.6.25 Assembling the percussion cartridge .......................................... 94
5.6.26 Installing the percussion cartridge ...............................................96
5.6.27 Installing the rear cover ............................................................... 97
5.6.28 Assembling the hydraulic motor .................................................. 98
5.6.29 Installing the hydraulic motor .......................................................101
5.6.30 Installing the pressure accumulators ...........................................103
5.6.31 Attaching the flushing housing .................................................... 104
5.6.32 Pressurizing the accumulators .................................................... 105
5.7 Special tools ..........................................................................................105

Copyright © Sandvik
ID: BG00602127 en-US D.001.1 2018-08-28
HL 820T, HF 820T Rock drill operation, maintenance and repair
instructions

1 INTRODUCTION
1.1 The Purpose of these instructions
This manual contains supplementary information for operation,
maintenance and repair of a component.
Before operating, or performing maintenance or repair procedures for the
component or system described in this manual, read and understand the
information in operator´s and maintenance manuals supplied with the
machine. Pay special attention to the safety information in chapter "2 Safety
and environmental instructions" of those manuals.
1.1.1 Validity of the manuals
This manual, and especially the safety information, is valid only if no
unauthorized changes to the product are made.
Continuing improvement and advancement of product design might have
caused changes to your product which are not included in this publication.
Note also that if a third party has made changes to the product after
delivery from the manufacturer, this publication does not include information
on these changes or their influences on the product.
Whenever a question arises regarding your product, or this manual, please
consult your local Sandvik representative for the latest available
information.

Copyright © Sandvik 7 (110)

ID: BG00602127 en-US D.001.1 2018-08-28
HL 820T, HF 820T Rock drill operation, maintenance and repair
instructions

This page is intentionally left blank

8 (110) Copyright © Sandvik

ID: BG00602127 en-US D.001.1 2018-08-28
HL 820T, HF 820T Rock drill operation, maintenance and repair
instructions

2 SAFETY AND ENVIRONMENTAL INSTRUCTIONS

2.1 Safety precautions

DANGER
ENTANGLEMENT HAZARD!
Getting entangled in rotating parts will cause death or severe injury.
Carry out maintenance and repair work only when the rig is not
running. Make sure that the rig cannot be started unintentionally
during maintenance work.

Operating, service and adjustment procedures must be carried out

only by personnel with specialized operation and service training.
Read and ensure that you understand the operating, maintenance,
and safety instructions before using or servicing the component.

2.2 Lifting instructions

A B

The maximum load capacity of the lifting eye is marked on the eye
circumference (A) or the frame (B).

Copyright © Sandvik 9 (110)

ID: BG00602127 en-US D.001.1 2018-08-28
HL 820T, HF 820T Rock drill operation, maintenance and repair
instructions

CORRECT INCORRECT

Fasten the lifting eye bolt to the tapped hole. Screw the lifting eye bolt to
the object to be lifted, use washer if necessary.
If there is no thread in the lift hole, use nut to fasten the lifting eye. Use
suitable washers.

45° 45°
90° 90°

180°

NOTE! Refer to the manufacturer's load tables for maximum load of the
lifting device in various positions.

10 (110) Copyright © Sandvik

ID: BG00602127 en-US D.001.1 2018-08-28
HL 820T, HF 820T Rock drill operation, maintenance and repair
instructions

2.3 Disposal
This section gives useful advice to identify which parts of the product are
recoverable, with a view to recycling or reusing the materials or
components for new applications. To ensure environmentally sound
treatment of a product and all of its components, the recovery issues are
already taken into account during the design phase of the product. Correct
handling of waste materials reduces costs and promotes the best use of the
components and materials.
• Metal parts: All the steel constructions and other metals of the body,
bearings, bushings, and rotation mechanisms are recyclable. The metals
can be melted and used as raw material for new products, except for
parts that have been in contact with substances that are regarded as
hazardous waste. The contaminated parts can usually be simply cleaned
or rinsed, after which they can be recycled.
• Plastic: Most plastic parts are recyclable, similarly to the metals. Each
plastic part carries information on the material used and a manufacturing
date, which can be used for determining whether the part can be
recycled.
• Rubber parts: Rubber parts must be cleaned before they are disposed
of.
• Sensor waste: Electrical and electronic components contain valuable
and recyclable materials, and in addition a set of chemicals and heavy
metals. Electrical components that are classified as hazardous waste
(batteries, circuit boards) and other hazardous waste must be delivered
to a licensed waste treatment location or be disposed of according to
local regulations. Never dump hazardous electrical or electronic waste.
• Oils and fluids: Oil waste must not be disposed of by burning, and
under no circumstances must oil be poured down the drain or into water
systems. Waste oil shall be collected in appropriate containers. The best
containers for collecting oil waste are the original containers for the oils.
The original containers already have the necessary warning labels, are
easy to close, and can be moved around fairly easily. Always strike out
the product name on the label and clearly label the container "oil waste".
Empty oil containers must not be dumped in landfills without having been
cleaned. Cleaned plastic containers can be disposed of as regular waste.
Most countries have arranged a recycling system for metal barrels.
Greases, fuels, solvents, and other substances must not be mixed with
oil waste.

Copyright © Sandvik 11 (110)

ID: BG00602127 en-US D.001.1 2018-08-28
HL 820T, HF 820T Rock drill operation, maintenance and repair
instructions

This page is intentionally left blank

12 (110) Copyright © Sandvik

ID: BG00602127 en-US D.001.1 2018-08-28
HL 820T, HF 820T Rock drill operation, maintenance and repair
instructions

3 ROCK DRILL MAIN COMPONENTS

3.1 Main components

4 5
3
6
2

7
8
9

1 Flushing housing 2 Gearbox

3 Rotation motor 4 High-pressure accumulator
5 Stabilizer accumulator 6 Rear cover
7 Low-pressure accumulator 8 Body
9 Spacer

3.2 Lubrication circulation

3.2.1 Percussion mechanism and rotation motor
The percussion mechanism and the rotation motor of the rock drill are
lubricated by the hydraulic oil flowing through them.

Copyright © Sandvik 13 (110)

ID: BG00602127 en-US D.001.1 2018-08-28
HL 820T, HF 820T Rock drill operation, maintenance and repair
instructions

3.2.2 Shank lubrication circulation

RISK OF DAMAGING THE ROCK DRILL!
Proper shank lubrication is necessary when operating the rock drill.
Inadequate lubrication quickly causes serious damage to the rock
NOTICE drill and overheating of the rotation bushing and shank. Overheating
leads to rapid wear of these components and also causes shank
breakage.

RISK OF PROPERTY DAMAGE!

NOTICE Do not let the rear cover make contact with water when the
lubrication blow is not on.

The rotation mechanism and shank are lubricated with oil mist lubrication.
The lubrication hose from the central lubrication device is connected to the
fitting in the rock drill. From there, the oil mist lubricates the rotation
mechanism, chuck, coupling, and flushing housing bearing. The drain oil
from the rear section of the piston is led to the front through the passage.
Oil mist that has travelled through the rock drill’s lubrication circulation
system is removed from the rock drill through the flushing housing fitting.
This used lubrication oil can be conveyed to a container with a hose.
RISK OF DAMAGING THE HYDRAULIC SYSTEM!
NOTICE Conveying the oil mist to the hydraulic system return line is
absolutely prohibited.

14 (110) Copyright © Sandvik

ID: BG00602127 en-US D.001.1 2018-08-28
HL 820T, HF 820T Rock drill operation, maintenance and repair
instructions

Copyright © Sandvik 15 (110)

ID: BG00602127 en-US D.001.1 2018-08-28
HL 820T, HF 820T Rock drill operation, maintenance and repair
instructions

Adjusting the shank lubrication device

Monitor the consumption from the shank lubrication recovery line (if
available).
The oil consumption should be 400-850 g/h. If necessary, turn the mixture-
adjusting screw of KVL or adjust the SLU settings accordingly.
Without pressurized air, shank lubrication does not work. Make sure that
the pressurized air distributes the shank lubrication oil to the lubricating
points.

16 (110) Copyright © Sandvik

ID: BG00602127 en-US D.001.1 2018-08-28
HL 820T, HF 820T Rock drill operation, maintenance and repair
instructions

4 ROCK DRILL OPERATION

4.1 Lifting points
Weights:
HL/HF 820T approx. 260 kg
HL/HF 820T Power Extractor approx. 300 kg

1
2

Remove the plugs (1) from the rear cover and install the lifting eyes (2).
Tie the lifting straps to the rock drill as shown in the figures.

Copyright © Sandvik 17 (110)

ID: BG00602127 en-US D.001.1 2018-08-28
HL 820T, HF 820T Rock drill operation, maintenance and repair
instructions

18 (110) Copyright © Sandvik

ID: BG00602127 en-US D.001.1 2018-08-28
HL 820T, HF 820T Rock drill operation, maintenance and repair
instructions

1 2

Remove the plugs (1) from the Power Extractor and install the lifting eyes
(2). Use a 6 mm washer under the lifting eye in the Power Extractor.

Copyright © Sandvik 19 (110)

ID: BG00602127 en-US D.001.1 2018-08-28
HL 820T, HF 820T Rock drill operation, maintenance and repair
instructions

4.2 Taking a new rock drill in use

4.2.1 Preparations
RISK OF PROPERTY DAMAGE!
NOTICE The new rock drill is supplied with unpressurized accumulators and
plugged hose connections.

• Pressurize the accumulators and connect the hoses before taking the
rock drill into use.
• Follow the instructions when pressurizing the accumulators. See manual
“Pressure accumulator for hydraulic rock drill; Maintenance instructions”.
The filling pressures are:
- High-pressure accumulator = 50 bar
- Low-pressure accumulator = 4 bar
- Stabilizer accumulator = 30 bar
• With a new rock drill, a hydraulic check and system flushing must be
performed before the rock drill is installed.

20 (110) Copyright © Sandvik

ID: BG00602127 en-US D.001.1 2018-08-28
HL 820T, HF 820T Rock drill operation, maintenance and repair
instructions

4.3 Hose connections

4
7
8
1

3
2

5
6
9

1 Shank lubrication 2 Percussion mechanism,

pressure side (H.P.)
3 Percussion mechanism, re- 4 Flushing
turn side (L.P.) (orifice Ø 8
mm)
5 Shank lubrication, recovery 6 Rotation, drain line
7 Rotation, receiver (L.P.) 8 Rotation, pressure (H.P.)
9 Stabilizer

4.4 Test run

WARNING
NOISE HAZARD!
Continuous exposure to noise above 80 dB (A) could cause hearing
impairment.
Wear approved hearing protectors.

Copyright © Sandvik 21 (110)

ID: BG00602127 en-US D.001.1 2018-08-28
HL 820T, HF 820T Rock drill operation, maintenance and repair
instructions

RISK OF DAMAGING THE ROCK DRILL!

Avoid using full percussion pressure when the drill bit is not in
contact with the rock, as this can strain the accumulator membranes
NOTICE and cause cavitation in the percussion mechanism. Such "idle
drilling" is especially likely when drilling upward and when cleaning
holes by pumping.

RISK OF DAMAGING THE ROCK DRILL!

NOTICE It is forbidden to test run the rock drill onto the assembly stand!
The shank must be removed before the test run.

When the maintenance is complete, the rock drill should be tested in the
service facility using hydraulic power pack before attaching it onto the drill
rig.
The purpose of the test run is to check the operation of the percussion and
rotation mechanisms of the rock drill, and to detect any possible leaks.
When testing the rotation mechanism, the percussion mechanism hoses
must be connected to the rock drill in order to enable the operation of the
internal lubrication of the rotation motor.
During the test run, observe the following:
• the operation of the shank lubrication
• the flushing operation
• the pressures and the temperature
• possible oil leaks.
Note! The shank lubrication and flushing operation can be tested only on a
drill rig or on a test bench that has a separate cushion unit.

Sandvik recommends that the rock drill is tested on the light test bench.
The manual explaining the test procedure is supplied with the light test
bench.
To get more information about light test bench, please contact to:
sfdrills.partssupport@sandvik.com or ugdrills.partssupport@sandvik.com.

22 (110) Copyright © Sandvik

ID: BG00602127 en-US D.001.1 2018-08-28
HL 820T, HF 820T Rock drill operation, maintenance and repair
instructions

4.4.1 Warming the hydraulic oil before the test run

1. Using a double nipple (A), connect the hoses of the power pack (B) to
make a loop so that the lines of both pumps form their own closed
circuits.
2. Turn on the power pack.
3. Pull the levers of the percussion and rotation control valves into operating
position.
Oil starts flowing through the systems in free circulation.
4. Allow the power pack to run for about 3 minutes, after which it is ready
for the test run.

Copyright © Sandvik 23 (110)

ID: BG00602127 en-US D.001.1 2018-08-28
HL 820T, HF 820T Rock drill operation, maintenance and repair
instructions

4.4.2 Performing the test run

4 5
6 6

7 8

10

2 3 1 9

1 Electric motor 2 Pump, percussion (30 - 45 l/

min)
3 Pump, rotation (15 - 20 l/min) 4 Control valve (percussion)
5 Control valve (rotation) 6 Pressure-relief valve
7 Pressure gauge (percussion) 8 Pressure gauge (rotation)
9 Return filter 10 Differential pressure valve

1. Connect the rock drill according to the hydraulic flowchart.

2. Make sure that
a) there is enough oil in the tank
b) the control valve (4) and (5) levers are in neutral position.
3. Start the powerpack.

24 (110) Copyright © Sandvik

ID: BG00602127 en-US D.001.1 2018-08-28
HL 820T, HF 820T Rock drill operation, maintenance and repair
instructions

4. Start percussion with the control valve (4).

Adjust the percussion pressure to 80 ... 100 bar.
5. Start rotation with the control valve (5).
Change the direction of rotation by moving the lever to the other extreme
position.
6. Continue the test run for about 5 minutes, and observe possible leaks.

Copyright © Sandvik 25 (110)

ID: BG00602127 en-US D.001.1 2018-08-28
HL 820T, HF 820T Rock drill operation, maintenance and repair
instructions

This page is intentionally left blank

26 (110) Copyright © Sandvik

ID: BG00602127 en-US D.001.1 2018-08-28
HL 820T, HF 820T Rock drill operation, maintenance and repair
instructions

5 ROCK DRILL MAINTENANCE INSTRUCTIONS

5.1 Scheduled maintenance
The idea of scheduled maintenance is to take the rock drill in for servicing
before a failure stops it during operation. This will prevent expensive
consequential failures and downtime that adversely affects production.
The maintenance interval varies according to local conditions and must
therefore be determined on the basis of experience.
When defining the correct maintenance interval, initially the scheduled
maintenance table should be consulted first and then the maintenance
interval should be adjusted until a suitable maintenance interval for local
conditions is determined.
In addition to this, the rock drill should undergo maintenance whenever the
operator reports a malfunction that could lead to a failure or production
downtime.

5.2 Tools needed for on-site maintenance

• Wrench, 19 mm
• Wrench, 24 mm
• Wrench, 36 mm
• Check gauge for low-pressure accumulator
• Check gauge for high-pressure accumulator
• Torque wrench
• Reversible ratchet wrench
• Socket extension
• Socket, 19 mm
• Socket, 24 mm
• Socket, 30 mm
• Socket, 36 mm

5.3 Daily maintenance

5.3.1 Hydraulic rock drill HL 820T, HF 820T

Checking the percussion hour reading

1. Check the percussion hour reading.
According to the reading, it is easier to schedule the next maintenance
date.

Checking the possible leaks

1. Check the rock drill for leaks.
Determine the cause for the leak and repair the leak source to avoid
further damage.

Copyright © Sandvik 27 (110)

ID: BG00602127 en-US D.001.1 2018-08-28
HL 820T, HF 820T Rock drill operation, maintenance and repair
instructions

Checking the condition of the hoses and connectors

1. Visually check the condition of the hoses and connectors of the rock drill.
2. Check that the connectors are not loose.
3. Check that the hoses do not chafe on anything.
4. Any faulty hoses or connectors must be changed before operating the
machine.
If necessary, contact local Sandvik service.

Checking the flushing housing seals

1. Start the flushing.

2. Check the condition of the flushing housing seals.
The flushing housing seals must be replaced
when the flushing air or water escapes from the drain holes (location of
the drain holes are shown in the picture).
3. Stop the flushing.

5.4 Periodic maintenance

5.4.1 Before replacing the bushings and bearings
The best method for installing the bushings and bearings is to take
advantage of temperature differences. The force needed in installation is
smaller when using cooled bushings and warm parts.
Before starting the maintenance work, put the new bushings in a freezer.
After removing the bushings and/or bearings, wash the other parts with hot
water, do not heat the parts.
Note! Do not install seals to cold parts, they may become brittle and break.
Let the parts warm up before installing the new seals.

28 (110) Copyright © Sandvik

ID: BG00602127 en-US D.001.1 2018-08-28
HL 820T, HF 820T Rock drill operation, maintenance and repair
instructions

5.4.2 Hydraulic rock drill HL 820T, HF 820T

Removing the flushing housing

RISK OF PROPERTY DAMAGE!
In replacing the shank, the rock drill must be tilted to as horizontal
NOTICE an orientation as possible to prevent the rotation bushing and
coupling from dropping.

6
7
5
4
3
2
1

1. Open the bolts (1).

2. Remove the flushing housing (2).
3. Remove the gasket plate (3).
4. Remove the shank (4, if attached).
5. Open the locking screw (8).
When the locking screw is opened, the coupling (5) and chuck (7) are
released first. When the screw is opened further, the rotation bushing (6)
is released.
6. Remove the coupling (5).
7. Remove the chuck (7).
8. Remove the rotation bushing (6).

Copyright © Sandvik 29 (110)

ID: BG00602127 en-US D.001.1 2018-08-28
HL 820T, HF 820T Rock drill operation, maintenance and repair
instructions

Wear limits for the flushing housing bushings

1 2

A B

Check the condition of the bearing bushing (1) and shank bushing (2).
The bearing must be replaced when the bearing surface is worn to the level
of the wear indicator groove (A) at any point.
The shank bushing must be replaced when 1 mm has worn from its
surface, the inner diameter rounding (B) has worn to a point, or the shank
bushing has cracks in it.

30 (110) Copyright © Sandvik

ID: BG00602127 en-US D.001.1 2018-08-28
HL 820T, HF 820T Rock drill operation, maintenance and repair
instructions

Disassembling of the flushing housing

1
6
5
4
2
3

1. Remove the U-seal (2) from the cover (4).

2. Open the bolts (3).
3. Pull the cover (4) from the flushing housing (1).
4. Remove the O-ring (5) from the cover (4).
5. Remove the gasket plate (6).
6. Open the bolts (7).

11

10

7. Pull the flushing line connector (8) from the flushing house (1).
8. Remove the O-rings (9 and 10) from the connector (8) flange.
9. Remove the gasket plate (11).
10. Press the seal housing (12) out from the flushing housing (1).

1
12

Copyright © Sandvik 31 (110)

ID: BG00602127 en-US D.001.1 2018-08-28
HL 820T, HF 820T Rock drill operation, maintenance and repair
instructions

11. Remove the O-rings (13) and U-seals (14) from the seal housing (12).

13
14
12
14
13

Checking the coupling

1. Pull the coupling out from the rotation bushing.

2. Check the coupling.
Replace the coupling if the edges of the inner teeth are worn to a pointed
shape, or visible cracks are seen.

Checking the rotation bushing

1. Check the wear of the rotation bushing teeth and the bearing surfaces.

32 (110) Copyright © Sandvik

ID: BG00602127 en-US D.001.1 2018-08-28
HL 820T, HF 820T Rock drill operation, maintenance and repair
instructions

Changing the rotation bushing bearing

1. Check the condition of the rotation bushing bearing.

The bearing must be replaced when the bearing surface is worn to the
level of the wear indicator groove (A) at any point around the
circumference.
2. Press the bearing (3) out of the rotation bushing (2).
Use the hydraulic press and the extension bar (T6) and punches (T15
and T18).

T6

T15

T18

3. Clean the parts.

4. Lubricate the parts with hydraulic oil.

Copyright © Sandvik 33 (110)

ID: BG00602127 en-US D.001.1 2018-08-28
HL 820T, HF 820T Rock drill operation, maintenance and repair
instructions

5. Install the new bearing (7) to the rotation bushing (6).

Use a hydraulic press and the extension bar (T6) and punches (T15 and
T19).

T6

T15

T19

Checking the chuck

1 mm

1. Check the axial support surface, where the shank rests.

The chuck must be replaced when 1 mm has worn from its surface, or
the chuck has cracks in it.

34 (110) Copyright © Sandvik

ID: BG00602127 en-US D.001.1 2018-08-28
HL 820T, HF 820T Rock drill operation, maintenance and repair
instructions

Checking the shank

RISK OF PROPERTY DAMAGE!
Remove the storage grease and labels off from the new shank,
before installing it to the rock drill.
NOTICE When installing a new shank to the rock drill, ensure that no
impurities are carried into the rock drill with the shank.
Push the shank carefully through the flushing housing to avoid
damaging the flushing housing seals.

max. 1 mm max. 1 mm
min. 1 mm

1. Measure the shank.

The shank must be replaced when any of the bevels at its rear has worn
off or any other wear limit is exceeded.

Copyright © Sandvik 35 (110)

ID: BG00602127 en-US D.001.1 2018-08-28
HL 820T, HF 820T Rock drill operation, maintenance and repair
instructions

Changing the flushing housing bushings

1. Check the parts.

If the part is damaged, replace it to the new one. If one or more of the
bushings has worn to the level of the indicator groove, replace them as
described below.
Bushings must be changed if they have been used at 500 hours. Check
the time used from the rock drill service card.
2. Press the bearing bushing (2) out of the front cover (1).
Use the hydraulic press and the punch (T14).

T14

3. Clean the parts.

4. Install the new bearing (2) to the front cover (1).
Use a hydraulic press and a suitable tool (A) (example the metal sheet, if
necessary).
NOTE! Before assembly, check that the bearing is at the right position in
comparison with the front cover. See the picture.

36 (110) Copyright © Sandvik

ID: BG00602127 en-US D.001.1 2018-08-28
HL 820T, HF 820T Rock drill operation, maintenance and repair
instructions

5. Install the new U-seal (3) to the front cover (2).

NOTE! The orientation in which the seals should be installed depends on
the flushing mode:
A) Air flushing.
B) Water / water mist flushing.

A B

Copyright © Sandvik 37 (110)

ID: BG00602127 en-US D.001.1 2018-08-28
HL 820T, HF 820T Rock drill operation, maintenance and repair
instructions

6. Press the shank bushing (5) out of the flushing housing (4).
Use the hydraulic press and the extension bar (T6) and punch (T15).

T6

T15

7. Clean the parts.

8. Install the new shank bushing (5) to the flushing housing (4).
Use a hydraulic press and punch (T15) or suitable metal sheet.
NOTE! Before assembly, check that the bushing is at the right position in
comparison with the flushing housing. See the picture.

T15

38 (110) Copyright © Sandvik

ID: BG00602127 en-US D.001.1 2018-08-28
HL 820T, HF 820T Rock drill operation, maintenance and repair
instructions

Assembling the flushing housing

1. Install new U-seals (14) into the seal housing (12).
NOTE! The orientation in which the seals should be installed depends on
the flushing mode:
A) Air flushing.
B) Water / water mist flushing.

A 13 12

14

B 13 12

14

2. Install new O-rings (13) onto the seal housing (12).

3. Push the seal housing (12) into the flushing housing (1).
Make sure that the holes (A) are aligned.

A
A

12 1

Copyright © Sandvik 39 (110)

ID: BG00602127 en-US D.001.1 2018-08-28
HL 820T, HF 820T Rock drill operation, maintenance and repair
instructions

4. Put new gasket plate (11) on the connector (8).

11

10

5. Install new O-rings (9 and 10) onto the connector (8) flange.
6. Install the connector (8) to the flushing housing (1).
7. Put new lockwashers onto the bolts (7).
8. Lubricate the bolt threads with grease.
9. Tighten the bolts (7).
See the section "Flushing line connector bolts" for the bolt tightening
instructions.
10. Put new gasket plate (6) on the front cover (4).

1
6
5
4
2
3

11. Install new O-ring (5) onto the front cover (4).
12. Install the front cover (4) to the flushing housing (1).
13. Put new lockwashers on the bolts (3).
14. Lubricate the bolt threads with grease.
15. Tighten the bolts (3).
See the section "Flushing housing front cover bolts" for the bolt
tightening instructions.

40 (110) Copyright © Sandvik

ID: BG00602127 en-US D.001.1 2018-08-28
HL 820T, HF 820T Rock drill operation, maintenance and repair
instructions

Attaching the flushing housing

6
7
5
4
3
2
1

1. Push the rotation bushing (6) into the rock drill.

2. Tighten the locking screw (8) to secure the rotation bushing (6).
Do not turn the locking screw too much. Turning the locking screw too
deep prevents the installation of the chuck (7) and the coupling (5).
3. Push the chuck (7) into the rotation bushing (6).
Note the orientation of the chuck (7). Push the chuck in the rotation
bushing at the grooved end first.
4. Push the coupling (5) into rotation bushing (6).
5. Tighten the locking screw (8).
6. Push the shank (4) carefully into place in the flushing housing (1).
NOTE! Do not damage the U-seals while pushing the shank.
7. Place the gasket plate (3) on the face of the rock drill.
8. Put new O-ring on the flushing housing.
9. Fasten the flushing housing (2) to the rock drill.
10. Put new lockwashers onto the bolts (1).
11. Lubricate the bolt (1) threads with grease.
12. Tighten the bolts (1).
See the section "Flushing housing front cover bolts" for the bolt
tightening instructions.

Copyright © Sandvik 41 (110)

ID: BG00602127 en-US D.001.1 2018-08-28
HL 820T, HF 820T Rock drill operation, maintenance and repair
instructions

Checking the accumulator filling valve and cover plug condition

WARNING
HIGH PRESSURE HAZARD!
High pressure could cause death or severe injury
Do not remove the filling valve from a pressurized accumulator.

Required tools:
• Wrench, 10 mm
• Wrench, 19 mm
• Torque wrench
• Socket, 19 mm

4
3
2
1

1. Check that the filling valve (4) is tightened.

2. Check that the rubber protection cap (1) or the metal cap (2) is installed
on the filling valve (4) thread.
Note! There must be a cap protecting the thread.

Replace the cap with a new one if it is damaged or missing.

3. Remove the rubber protection cap (1) or the metal cap (2).
4. Check that the filling valve or its parts are not damaged.
Refer to the separate Pressure accumulator maintenance instructions to
change the damaged valve. Do not remove the filling valve from a
pressurized accumulator!
5. Check that the locking nut (3) is tightened to 15 Nm.
6. Install the rubber protection cap (1) or the metal cap (2).

42 (110) Copyright © Sandvik

ID: BG00602127 en-US D.001.1 2018-08-28
HL 820T, HF 820T Rock drill operation, maintenance and repair
instructions

Checking the accumulator pressure

RISK OF DAMAGING THE ROCK DRILL!
An empty pressure accumulator causes cavitation, which will
NOTICE damage the rock drill.
Check the accumulator pressure regularly. Change or repair the
accumulator immediately if there is no pressure.

Check the accumulator pressure every 50 hours or earlier, if necessary.

Pressure loss may be a result of a damaged filling valve or a broken
diaphragm. Replace the filling valve and the diaphragm to ensure flawless
operation of the accumulator.
1. Check the accumulator pressure.
Detailed instructions are in the manual Pressure accumulator for
hydraulic rock drill.

Checking the bolt tightness and tightening torques

Checking the tightness of the bolts is an important maintenance procedure
for a rock drill.
Check the bolts during regular maintenance.
1. Check that the threads are clean.
The bolts cannot be tightened to the correct torque if the threads are not
clean. If necessary, clean and check the threads and lubricate them with
grease.
2. Check the tightness of the bolts.
When checking the tightness of the bolts, use the correct tightening
sequence and a tightening torque 10% greater than what is specified.
A bolt is too loose if it can turn. In this case, other appropriate bolts must
be loosened and re-tightened according to the tightening instructions.

Note! Only use calibrated, high-quality torque wrench.

Copyright © Sandvik 43 (110)

ID: BG00602127 en-US D.001.1 2018-08-28
HL 820T, HF 820T Rock drill operation, maintenance and repair
instructions

Accumulator bolts

Required tools:
• torque wrench
• socket, 24 mm
1. Lubricate the bolt threads with grease.
2. Tighten the bolts to 100 Nm (10 kpm).
Use torque wrench.
3. Re-tighten the bolts to 200 Nm (20 kpm).
Use torque wrench.

RISK OF DAMAGING THE ACCUMULATOR!

NOTICE The four-bolt accumulator must be tighten by using a
crosstightening method.

44 (110) Copyright © Sandvik

ID: BG00602127 en-US D.001.1 2018-08-28
HL 820T, HF 820T Rock drill operation, maintenance and repair
instructions

Flushing housing mounting bolts

D A

B C

Required tools:
• torque wrench
• socket, 36 mm
• wrench, 36 mm
1. Lubricate the bolt threads with grease.
2. Put new lockwashers onto the bolt.
3. Tighten the bolts to 300 Nm (30 kpm).
Use torque wrench.
Use the tightening sequence A, B, C, D.
4. Re-tighten the bolts to 600 Nm (60 kpm).
Use torque wrench.
Use the tightening sequence A, B, C, D.

Alternative tightening procedure:

• Tighten bolts to 200 Nm (20 kpm)
• Re-tighten the bolts by turning them at 30° degree.

Flushing housing front cover bolts

Required tools:
• torque wrench
• socket, 24 mm
1. Lubricate the bolt threads with grease.
2. Put new lockwashers onto the bolts.
3. Tighten the bolts to 100 Nm (10 kpm).
Use torque wrench.
4. Re-tighten the bolts to 200 Nm (20 kpm).
Use torque wrench.

Copyright © Sandvik 45 (110)

ID: BG00602127 en-US D.001.1 2018-08-28
HL 820T, HF 820T Rock drill operation, maintenance and repair
instructions

Side bolts
Required tools:
• torque wrench
• socket, 24 mm.
1. Push the side bolts (3) through the holes.

1
3
2

2. Lubricate the side bolt threads and nut (1 and 2) faces with grease.
3. Turn the rearmost nuts (1) fully closed.
4. Tighten the nuts (2) to 200 Nm (20 kpm).
Use torque wrench.
Use the tightening sequence A, B, C, D.

2 B

D
A

5. Re-tighten the nuts (2) to 400 Nm (40 kpm).

Use torque wrench.
Use the tightening sequence A, B, C, D.

46 (110) Copyright © Sandvik

ID: BG00602127 en-US D.001.1 2018-08-28
HL 820T, HF 820T Rock drill operation, maintenance and repair
instructions

Flushing line connector bolts

Required tools:
• torque wrench
• socket, 24 mm
1. Lubricate the bolt threads with grease.
2. Put new lockwashers onto the bolt.
3. Tighten the bolts to 100 Nm (10 kpm).
Use torque wrench.
4. Re-tighten the bolts to 200 Nm (20 kpm).
Use torque wrench.

Intermediate gear pin bolts

Required tools:
• torque wrench
• socket, 24 mm
1. Lubricate the bolt threads with grease.
2. Put new lockwashers onto the bolts.
3. Tighten the bolts to 100 Nm (10 kpm).
Use torque wrench.
4. Re-tighten the bolts to 200 Nm (20 Nm).
Use torque wrench.

Copyright © Sandvik 47 (110)

ID: BG00602127 en-US D.001.1 2018-08-28
HL 820T, HF 820T Rock drill operation, maintenance and repair
instructions

Hydraulic motor mounting bolts

B
D

C
A

Required tools:
• torque wrench
• socket, 24 mm
1. Lubricate the bolt threads with grease.
2. Tighten the bolts to 100 Nm (10 kpm).
Use torque wrench.
Use the tightening sequence A, B, C, D.
3. Re-tighten the bolts to 200 Nm (20 kpm).
Use torque wrench.
Use the tightening sequence A, B, C, D.

48 (110) Copyright © Sandvik

ID: BG00602127 en-US D.001.1 2018-08-28
HL 820T, HF 820T Rock drill operation, maintenance and repair
instructions

Rear cover bolts

F D

A B

C E

Required tools:
• torque wrench
• socket, 30 mm
1. Lubricate the bolt threads with grease.
2. Put new lockwashers onto the bolts.
3. Tighten the bolts to 200 Nm (20 kpm).
Use torque wrench.
Use the tightening sequence A, B, C, D, E, F.
4. Re-tighten the bolts to 400 Nm (40 kpm).
Use torque wrench.
Use the tightening sequence A, B, C, D, E, F.

Rock drill overhaul

The rock drill should be disassembled and its components checked
regularly.
The recommended maintenance interval for the rock drill overhaul is 500
percussion hours, but the interval varies according to local conditions and
must therefore be determined on the basis of experience. It is better to
perform preventive maintenance than repair the machine after the damage
has already happened.
Write down the percussion hours and/or number of meters drilled per shift
during each maintenance interval. Fill in the rock drill maintenance card.
Overhaul instructions and maintenance tasks are defined in the rock drill
technical manual, chapter Rock drill overhaul.

Copyright © Sandvik 49 (110)

ID: BG00602127 en-US D.001.1 2018-08-28
HL 820T, HF 820T Rock drill operation, maintenance and repair
instructions

Replacing the rear cover bolts (HF 820T only)

1. Replace the rear cover mounting bolts during every other overhaul (every
1000 percussion hours).
Use new lockwashers.

After rock drill service

After the maintenance is complete, the reinstalled components, especially
when surfaces are worn, settle into their proper places for a while, causing
the side bolts and mounting bolts to loosen.
Following maintenance, re-tighten all the rock drill bolts after drilling
about 100–200 meters.

5.5 Service follow-up

When a rock drill is brought in for maintenance, the previous maintenance
cards must be available. The card is filled in with as much information
about the maintenance as possible.
The maintenance card indicates the replacement rate of parts in each rock
drill, and the effect of different conditions and procedures can be seen by
comparing the various cards.
• The card must be available for preventive maintenance.
• A properly completed card contains the entire maintenance history of a
rock drill.
• The card simplifies the decision to scrap an old machine.

50 (110) Copyright © Sandvik

ID: BG00602127 en-US D.001.1 2018-08-28
HL 820T, HF 820T Rock drill operation, maintenance and repair
instructions

5.6 HL 820T, HF 820T rock drill overhaul

5.6.1 Repair facilities
RISK OF DAMAGING THE ROCK DRILL!
Any dust and debris getting inside the rock drill will cause premature
NOTICE wearing of the rock drill components.
The drill bit grinding device, or any other device creating dust or
debris, should not be housed at the rock drill repair facility.

Faultless operation of a rock drill stems largely from appropriate use of the
repair facilities. Make sure that the repair site is clean.
Characteristics of suitable repair facilities:
• well lit
• appropriate washing facilities
• compressed air available
• free of dust
• has all required documentation
• has the required tools.
Example of equipment available at repair facilities:

2 3

4 5
1
9

6 7 8

1 Spare part storage 2 Hydraulic press, 30 t

3 Washing bay 4 Rubber-coated work table
5 Vice 6 Bench drill
7 Tools 8 Assembly stand
9 Hoist

Copyright © Sandvik 51 (110)

ID: BG00602127 en-US D.001.1 2018-08-28
HL 820T, HF 820T Rock drill operation, maintenance and repair
instructions

5.6.2 Rock drill overhaul instructions

The following instructions are intended for persons servicing and repairing
Sandvik hydraulic rock drills. Disassembling and assembling the rock drill
requires expertise and familiarity with the rock drill.

WARNING
HIGH PRESSURE HAZARD!
High pressure could cause death or severe injury.
Release the accumulator pressure before performing maintenance
work on the rock drill.
Before pressurizing a pressure accumulator, install it to the rock
drill. Do not pressurize a pressure accumulator if it is not installed to
a rock drill.

WARNING
CRUSHING HAZARD!
Tilting assembly/service stand could cause severe injury.
Always use a hoist when tilting the rock drill in the assembly/service
stand.

Follow the instructions in the regular maintenance table. With regular

preventive maintenance, optimal utilization is achieved. Replace any worn
part promptly to avoid more serious damage.
Before performing installation, carefully check that the parts are clean since
even new parts can be dirty (a bottle brush is useful for cleaning the
components of the rock drill cylinder). The use of unauthorized, i.e. non-
OEM, spare parts has been found to cause increased costs in almost all
cases. The warranty for the entire system becomes void immediately if any
part is replaced with a non-OEM part.
Checking the tightness of the side bolts is one of the most important
maintenance procedures for a rock drill. Neglecting this procedure can
cause rapid wear of the rock drill frame's end faces.
Check the wear of the parts. See wear limits for section Wear limits and
wear parts.
After the rock drill overhaul, perform a test run to the rock drill before
mounting it to the drill rig.

Disassembly of the rock drill

Before disassembly, the rock drill must be washed externally with, for
example, high-pressure water. In addition, we recommend that the rock drill
is washed externally with a brush and appropriate solvent before it is
brought to the final repair location.

52 (110) Copyright © Sandvik

ID: BG00602127 en-US D.001.1 2018-08-28
HL 820T, HF 820T Rock drill operation, maintenance and repair
instructions

Removing the seals

RISK OF DAMAGING THE ROCK DRILL!
Scratches on the seal grooves will cause leaks and premature
NOTICE wearing of the seals and O-rings.
Do not scratch the seal grooves when replacing seals and O-rings.

The seals are the most sensitive and important components of a rock drill.
When disassembling a rock drill, always replace all seals and O-rings.

Be careful not to scratch the seal grooves and components inside the rock
drill.
5.6.3 Attaching the rock drill to the assembly stand

B
C

1. Turn the assembly stand in a horizontal position.

2. Secure the assembly stand in a horizontal position with the latch (A).
3. Tighten the bolts (B).
4. Attach the rock drill to the assembly stand with the bolts (C).
5.6.4 Removing the flushing device
Remove the flushing housing as instructed in the section Removing the
flushing housing.

Copyright © Sandvik 53 (110)

ID: BG00602127 en-US D.001.1 2018-08-28
HL 820T, HF 820T Rock drill operation, maintenance and repair
instructions

5.6.5 Detaching the pressure accumulators

WARNING
HIGH PRESSURE HAZARD!
High pressure could cause death or severe injury.
Make sure that accumulator pressure has been released before
removing the accumulator from the rock drill.

6 5 1
4

3 2

3
6

1. Make sure that the accumulator pressure has been released by opening
the filling valves (1).
2. Open the accumulator bolts (7).
3. Detach the accumulators (2).
4. Remove the O-rings (3, 4, and 6).
5. Remove the gasket plate (5).
6. Insert protective plugs into the rock drill openings.
7. Check the condition of the accumulators.
Replace the accumulator if required.

More detailed information about disassembly, inspection, assembly, and

pressurizing of the pressure accumulators are shown in the manual :
“Pressure accumulator for hydraulic rock drill; Maintenance instructions“.

54 (110) Copyright © Sandvik

ID: BG00602127 en-US D.001.1 2018-08-28
HL 820T, HF 820T Rock drill operation, maintenance and repair
instructions

5.6.6 Detaching the hydraulic motor

2 1
3

1. Open the hydraulic motor mounting bolts (1).

2. Pull the hydraulic motor assembly (2) from the gear housing.
3. Remove the O-ring (3).

Copyright © Sandvik 55 (110)

ID: BG00602127 en-US D.001.1 2018-08-28
HL 820T, HF 820T Rock drill operation, maintenance and repair
instructions

Disassembling the hydraulic motor

4 3

T7 T22

1
2

1. Remove the cover bolts (2).

2. Pull the rotation shaft assembly (1) out of the bearing housing (3).
Use the special tools (T7 and T22).
3. Remove the O-ring (4) from the bearing housing (3).
4. Remove the thrust (15) from the rotation shaft (16).

9
14
13

15
16

5
6
7
8
10
11
12

5. Remove spherical bearing inner ring (5).

Use the puller.
6. Lift the lock washer (7) locking plate from the lock nut (6) groove.
7. Open the lock nut (6).
8. Remove the lock washer (7).
9. Pull the spherical roller bearing (8) from the rotation shaft (16).

56 (110) Copyright © Sandvik

ID: BG00602127 en-US D.001.1 2018-08-28
HL 820T, HF 820T Rock drill operation, maintenance and repair
instructions

10. Pull the rotation shaft (16) from the cover (9).
11. Remove the circlip (11).
12. Remove the shaft seal (12).
13. Remove the circlip (13).
14. Remove the shaft seal (14).
15. Remove the O-ring (10).
5.6.7 Detaching the side bolts

3
1

1. Open the front nuts (1) and remove them.

2. Open the rearmost nuts (2) and remove them.
3. Push the side bolts (3) out.

Copyright © Sandvik 57 (110)

ID: BG00602127 en-US D.001.1 2018-08-28
HL 820T, HF 820T Rock drill operation, maintenance and repair
instructions

5.6.8 Turning the assembly stand to a vertical position

D A

1. Install lifting eye (D) to flushing housing mounting hole.

2. Tie the lifting strap to lifting eye and lifting hook.
3. Tighten the lifting strap.
4. Remove the vertical position locking bolt (C).
5. Remove the horizontal position locking bolts (B).
6. Open the latch (A).
7. Turn the assembly stand to a vertical position.
8. Lock the position by tightening the locking bolt (C) to its place.

58 (110) Copyright © Sandvik

ID: BG00602127 en-US D.001.1 2018-08-28
HL 820T, HF 820T Rock drill operation, maintenance and repair
instructions

5.6.9 Detaching the rear cover

1. Open the rear cover (3) bolts (4).

2. Detach the rear cover (3) from the rock drill.
3. Remove the O-ring (2) from the rear cover.
4. Remove the O-ring (1) from the rock drill.

Copyright © Sandvik 59 (110)

ID: BG00602127 en-US D.001.1 2018-08-28
HL 820T, HF 820T Rock drill operation, maintenance and repair
instructions

5.6.10 Detaching the percussion cartridge

1. Attach the lifting eye (A) to the end of the percussion cartridge (1).
2. Lift the percussion cartridge (1) out of the rock drill.
5.6.11 Disassembling the percussion cartridge

1 2 3 4

1. Remove the rear cylinder (3) and distributor (2) from the piston (1).
2. Remove the bearing (4) from the rear cylinder (3).
3. Remove O-rings and seals from the parts.

60 (110) Copyright © Sandvik

ID: BG00602127 en-US D.001.1 2018-08-28
HL 820T, HF 820T Rock drill operation, maintenance and repair
instructions

Checking the percussion cartridge parts

1. Check parts for cracks, seizure marks, and other damage.

Minor scratches can be polished with a cloth wheel; grinding is not
allowed.
2. Check the rear cylinder.
If the rear cylinder has scratches, remove them by polishing with a cloth
wheel.
If the sliding surface has scratches that can be felt with a finger, replace
the rear cylinder.

3. Check the distributor.

If the distributor has light scratches, remove them by polishing with a
cloth wheel.
If the distributor has seizure marks, replace the distributor.

Copyright © Sandvik 61 (110)

ID: BG00602127 en-US D.001.1 2018-08-28
HL 820T, HF 820T Rock drill operation, maintenance and repair
instructions

4. Check the piston.

If necessary, the piston may be polished with a cloth wheel.
Replace the piston if:
• the bevel (A) at the percussion end has worn off
• the piston has cracks
• the piston has seizure marks in it.

62 (110) Copyright © Sandvik

ID: BG00602127 en-US D.001.1 2018-08-28
HL 820T, HF 820T Rock drill operation, maintenance and repair
instructions

5.6.12 Detaching the body

1. Attach the lifting eyes (A) to the body (1) as shown in the picture.
2. Tie the lifting strap to the lifting eyes and lifting hook.
3. Tighten the lifting strap.
4. Remove the rear mounting bolts (B).
5. Lift the body (1) off.
5.6.13 Detaching the front cylinder

1. Push the front cylinder (1) out of the body.

Copyright © Sandvik 63 (110)

ID: BG00602127 en-US D.001.1 2018-08-28
HL 820T, HF 820T Rock drill operation, maintenance and repair
instructions

5.6.14 Turning the assembly stand to a horizontal position

1. Install the lifting eye to flushing housing mounting hole.

2. Tie the lifting strap to the lifting eye and lifting hook.
3. Remove the horizontal position locking bolts (B).
4. Remove the vertical position locking bolt (C).
5. Open the latch (A).
6. Turn the assembly stand to a horizontal position.
7. Turn and the lock the latch (A) over the assembly stand.
8. Install and tighten the locking bolts (B).
9. Remove the lifting strap.

64 (110) Copyright © Sandvik

ID: BG00602127 en-US D.001.1 2018-08-28
HL 820T, HF 820T Rock drill operation, maintenance and repair
instructions

5.6.15 Detaching the stabilizer spacer

1. Pull the spacer off.

Use plastic hammer to hit the spacer if it is stuck.

Disassembling the stabilizer spacer

3
2
1

1. Pull the spacing ring (1), the long movement piston (2), and the short
movement piston (3) out of the spacer.

Copyright © Sandvik 65 (110)

ID: BG00602127 en-US D.001.1 2018-08-28
HL 820T, HF 820T Rock drill operation, maintenance and repair
instructions

Changing the stabilizer spacer bushings and bearings

T15

T21

1. Press the sealing bushing (5) out of the spacer (4).

Use a hydraulic press and special tool (T15 and T21).
2. Press the outer bearing (6) out of the spacer (4).
Use a hydraulic press and special tools (T23 and T24).

4 T24

T23

66 (110) Copyright © Sandvik

ID: BG00602127 en-US D.001.1 2018-08-28
HL 820T, HF 820T Rock drill operation, maintenance and repair
instructions

3. Press the inner bearing (7) out of the spacer (4).

Use a hydraulic press and special tool (T24).

4 T24

4. Clean the parts.

5. Install the new inner bearing (7) to the spacer (4).
Use a hydraulic press and special tools (T15 and T21).

T15

4 T21

Copyright © Sandvik 67 (110)

ID: BG00602127 en-US D.001.1 2018-08-28
HL 820T, HF 820T Rock drill operation, maintenance and repair
instructions

6. Install the new outer bearing (6) to the spacer (4).

Use a hydraulic press and special tools (T10 and T21).

T10

T21

4 6

7. Check the sealing bushing (5) piston seal grooves (A).

Check the groove width with the gauge G1. Maximum groove width is
4.35 mm. Check the grooves visually.
NOTE! If a groove is too wide or damaged, replace the sealing bushing.

G1

A A

68 (110) Copyright © Sandvik

ID: BG00602127 en-US D.001.1 2018-08-28
HL 820T, HF 820T Rock drill operation, maintenance and repair
instructions

8. Install the O-ring (8) in the spacer.

10
11

8 9
4 5 12 13

9. Install the stabilizer piston seal O-ring (9) in the sealing bushing (5).
10. Install the rod seal O-rings (11) in the sealing bushing (5).
11. Install the rod seals (12) in the sealing bushing (5).
NOTE! Make sure that the seals are installed at the correct position.
See the picture.
12. Install the O-ring (13) on the sealing bushing (5).
13. Install the stabilizer piston seal (10) in the sealing bushing (5).
a) Warm the seals in oil (to 50–60 ºC) to facilitate the installation.
b) Lubricate the O-ring and the outer surface of the seal, and install
the piston seal O-ring first.
Do not roll the O-ring into the groove.
c) Bend the seal with your fingers as shown in the figure so that the
bend indicated with an arrow is as smooth as possible.
Use only your fingers; not your fingernails.
d) Press the seal into its groove as indicated by the arrows (1, 2, and
3).
NOTE! Do not use any tool to press the seal. The sealing surface
(D) in particular is easily damaged.
NOTE! At this stage, the outer edges of the seal (C) tends to
spread out, impending the installation.
Prevent the seal from spreading by squeezing it from the sides,
and guide it into its groove in the direction indicated by the arrow
(4).
e) Centralize the seal with stabilizer piston.
Use plenty of oil on the seal and gently push the part to be
installed over the seal.

Copyright © Sandvik 69 (110)

ID: BG00602127 en-US D.001.1 2018-08-28
HL 820T, HF 820T Rock drill operation, maintenance and repair
instructions

4
D

1 3

2
C

14. Install the sealing bushing (5) to the spacer (4).

NOTE! Before pressing the sealing bushing to the spacer, align the
sealing bushing groove with the spacer groove (B).
Use hydraulic press and special tool (T10).

4 T10 B

70 (110) Copyright © Sandvik

ID: BG00602127 en-US D.001.1 2018-08-28
HL 820T, HF 820T Rock drill operation, maintenance and repair
instructions

Changing the short movement piston bearing

T26

T26

14 15
14 15

1. Press the short movement piston bearing (15) out of the short movement
piston (14).
Use a hydraulic press and special tool (T26).
2. Clean the parts.
3. Install the new bearing (15) to the short movement piston (14).
Use a hydraulic press and special tool (T26).

Copyright © Sandvik 71 (110)

ID: BG00602127 en-US D.001.1 2018-08-28
HL 820T, HF 820T Rock drill operation, maintenance and repair
instructions

Changing the spacing ring bearing

T25 T25

16 17 16 17

1. Push the spacing ring bearing (17) out of the spacing ring (16).
Use a hydraulic press and special tool (T25).
2. Clean the parts.
3. Install the new spacing ring bearing (17) to the spacing ring (16).
Use a hydraulic press and special tool (T25).

72 (110) Copyright © Sandvik

ID: BG00602127 en-US D.001.1 2018-08-28
HL 820T, HF 820T Rock drill operation, maintenance and repair
instructions

5.6.16 Disassembling the gear housing

3
T27
T7
2

5
4
5

1. Open the bolts (2).

2. Pull the intermediate pin (3) out of the gear housing (1).
Use special tools (T7 and T27) to pull the pin out.
NOTE! When pulling the pin out, the intermediate gear (4) and the
support plates (5) drop inside of the gear housing.
3. Remove the intermediate gear (4) and support plates (5) from the gear
housing (1).
4. Remove the U-seal (6) from the gear housing (1).

T5 8 6 A T5 9

5. Remove the plug (7).

6. Remove the plug (8).
7. Drop the special tool (T5) into the gear housing (1), behind the bearing
(9) through the plug (8) hole.
8. Push the bearing (9) out of the gear housing (1).
Use a hammer, the special tool (T5) and suitable punch (A) (max
diameter 15 mm) through the plug (7) hole.

Copyright © Sandvik 73 (110)

ID: BG00602127 en-US D.001.1 2018-08-28
HL 820T, HF 820T Rock drill operation, maintenance and repair
instructions

Changing the intermediate gearwheel needle bearings

RISK OF PROPERTY DAMAGE!
NOTICE Ensure that the hard ends of the needle bearings (the sides with text)
are on the outside of the gear faces.

T16
T16

1 2 1 2

T17
2

T17

1. Press the needle bearings (2) out of the intermediate gear (1).
Use a hydraulic press and special tools (T16 and T17).
2. Clean the parts.
3. Install the first new needle bearing (2) to the intermediate gear (1).
Use a hydraulic press and special tools (T16 and T17).
NOTE! Make sure that the hard end (text side) of the bearing is on the
outside of the gear face.
4. Turn the intermediate gear (1) other way round.
5. Install the second new needle bearing (2) to the intermediate gear (1).
Use a hydraulic press and special tools (T16 and T17).
NOTE! Make sure that the hard end (text side) of the bearing is on the
outside of the gear face.

74 (110) Copyright © Sandvik

ID: BG00602127 en-US D.001.1 2018-08-28
HL 820T, HF 820T Rock drill operation, maintenance and repair
instructions

Changing the gear housing bushings and bearings

T9 1 T9 2
T7

1. Check the wear of the bushings (1 and 2).

Change them if necessary.
2. Press the first bushing (1) out of the gear housing.
Use a hydraulic press and special tool (T9).
Let the bushing drop into the gear housing.
3. Push the special tool (T9) inwards so the studs of the special tool (T9)
goes in the holes of the bushing (2).
4. Attach the special tool (T7) to the special tool (T9).
5. Pull the bushing (2) out of the gear housing.
6. Install the lifting eyes (A) to the flushing housing upper mounting bolt
holes.

7. Tie lifting strap to lifting eyes and lifting hook.

8. Remove the bolts (B).
9. Lift the gear housing.
10. Check the condition of the front bearing.
Change the bearing if the patterns of the bearing surface are worn out.

Copyright © Sandvik 75 (110)

ID: BG00602127 en-US D.001.1 2018-08-28
HL 820T, HF 820T Rock drill operation, maintenance and repair
instructions

11. Remove the front bearing (3).

Use a hammer and a screwdriver. Start removing the bearing from
factory made cut (C).
NOTE! Do not scratch the inner surface of the gear housing with a
screwdriver.

C 3

12. Check the condition of the rear bearing.

If the bearing surface (D) has worn to the level of surface (E), bearing
must be changed.
If the bushing surface has worn to the level of the wear indicator groove
(F), bushing must be changed.

D T4

76 (110) Copyright © Sandvik

ID: BG00602127 en-US D.001.1 2018-08-28
HL 820T, HF 820T Rock drill operation, maintenance and repair
instructions

13. Press the rear bearing (4) out of the gear housing.
Use a hydraulic press and the special tool (T4).
14. Remove the stabilizer piston seal and O-ring from the rear bearing.
15. Press the rear bearing bushing (5) out of the rear bearing (4).
Use a hydraulic press and special tools (T6 and T28).

T6

4
T28

16. Clean the parts.

17. Lubricate parts with the hydraulic oil.
18. Install the new bushing (5) into the rear bearing (4).
Use a hydraulic press and suitable metal plate.
19. Install new O-ring (7) and stabilizer piston seal (6) to the rear bearing
(4).

7
6
4

Copyright © Sandvik 77 (110)

ID: BG00602127 en-US D.001.1 2018-08-28
HL 820T, HF 820T Rock drill operation, maintenance and repair
instructions

20. Install the rear bearing (4) in the gear housing.

NOTE! Before pressing the rear bearing to the gear housing, align the
rear bearing shoulder with the gear housing shoulder (G).
Use a hydraulic press and special tools (T3 and T4).

T4
G G
T3

21. Install the new front bearing (3) into the gear housing.
Use a hydraulic press and special tools (T3 and T4).

T4

T3

78 (110) Copyright © Sandvik

ID: BG00602127 en-US D.001.1 2018-08-28
HL 820T, HF 820T Rock drill operation, maintenance and repair
instructions

22. Install the new bushing (2).

Use a hydraulic press and special tool (T9).
NOTE! Push the bushing in the gear housing at the bevel (A) first.

T9 2 T9 1

A A

23. Install the new bushing (1).

Use a hydraulic press and special tool (T9).
NOTE! Push the bushing in the gear housing at the bevel (A) first.
NOTE! Do not press the bushing too deep. Pressing the bushing too
deep prevents for intermediate gearwheel and support plates to fit in
their place.
24. Attach the gear housing back to the assembly stand.
Make sure that the assembly stand is in a horizontal position and it is
locked with mounting bolts (H) and the latch (J).

J
B

25. Tighten the bolts (B).

Copyright © Sandvik 79 (110)

ID: BG00602127 en-US D.001.1 2018-08-28
HL 820T, HF 820T Rock drill operation, maintenance and repair
instructions

5.6.17 Checking the body and rear cover

1 3 2

A B

1. Wash the components.

Before assembly and measurement, check that the components are
clean and that no oil film is present.
2. Measure the length (C) of the front cylinder and rear cylinder (3).
3. Take measurement A and B.
Measurement A-B must be greater than value C. if measurement A-B is
smaller than C, body (1) and rear cover (2) must be discarded.

80 (110) Copyright © Sandvik

ID: BG00602127 en-US D.001.1 2018-08-28
HL 820T, HF 820T Rock drill operation, maintenance and repair
instructions

5.6.18 Checking the gear housing

min 270 mm

1. Measure the length of the gear housing.

Manufacturing length is 271 mm. If the length is 270 mm or smaller,
discard the gear housing.

Copyright © Sandvik 81 (110)

ID: BG00602127 en-US D.001.1 2018-08-28
HL 820T, HF 820T Rock drill operation, maintenance and repair
instructions

5.6.19 Wear limits and wear parts

max. 1 mm max. 1 mm
min. 1 mm

2
1

6
5
4

9
10
7

15
14
13

12
11
8

18
17

16

82 (110) Copyright © Sandvik

ID: BG00602127 en-US D.001.1 2018-08-28
HL 820T, HF 820T Rock drill operation, maintenance and repair
instructions

Part Wear limits

Shank front bearing The bushing must be replaced when the bushing surface has worn
1
bushing down to the level of the wear indicator groove at any point.
The shank bushing must be replaced when 1 mm has worn from its
2 Shank bushing surface, the inner diameter rounding has worn to a point, or has
cracks in it.
The shank must be replaced when any of the bevels at its rear has
3 Shank
worn off or any other wear limit is exceeded.
The coupling must be replaced if the edges of the inner teeth are
4 Coupling
worn to a pointed shape, or has cracks in it.
The chuck must be replaced when 1 mm has worn from its surface, or
5 Chuck
has cracks in it.
Rotation bushing The bearing must be replaced when the bearing surface has worn
6
bearing down to the level of the wear indicator groove at any point.
Intermediate gear Replace when the shaft/sleeve is worn or if the shaft surface is dam-
7
shaft aged.
Gear housing front The bearing must be replaced when the patterns of the bearing sur-
8
bearing face are worn out at any point.
Gear housing rear The bearing must be replaced if any of the wear indicators has worn
9
bearing off.
Gear housing rear The bushing must be replaced if the bushing surface has worn to the
10
bearing bushing level of the wear indicator groove.
Spacing ring bear-
11 The bearing must be replaced every 500 percussion hours.
ing
Short movement
12 The bearing must be replaced every 500 percussion hours.
piston bearing
Spacer outer bear-
13 The bearing must be replaced every 1000 percussion hours.
ing
Spacer inner bear-
14 The bearing must be replaced every 1000 percussion hours.
ing
Spacer sealing The sealing bushing must be replaced when the piston seal groove is
15
bushing worn out.
The piston must be replaced if bevel at the percussion end is worn
16 Piston
out, the piston has cracks or the piston has seizure marks in it.
17 Distributor The distributor must be replaced if the distributor has seizure marks.
The rear cylinder must be replaced if the sliding surface has scratch-
18 Rear cylinder
es that can be felt with a finger.

Copyright © Sandvik 83 (110)

ID: BG00602127 en-US D.001.1 2018-08-28
HL 820T, HF 820T Rock drill operation, maintenance and repair
instructions

5.6.20 Assembly
Before assembly:
1. Remove all the old O-rings and seals.
2. Clean all the parts thoroughly.
3. Check the condition of the parts.
4. Lubricate all the parts using a generous amount of lubricant.

Installing seals

1. Warm the seals in oil (to 50–60 ºC) to facilitate the installation.
2. Lubricate the O-ring and the outer surface of the seal, and install the O-
ring (1) first.
Do not roll the O-ring into the groove.
3. Bend the seal with your fingers as shown in the figure so that the bend
indicated with an arrow is as smooth as possible.
Use only your fingers; not your fingernails.
In particular, the seal lip (A) is easily damaged by, for example, careless
handling during installation of seals.
4. Install the seal in place by pressing it with fingers lightly and equally on
both sides so that the seal settles in the correct position.
Do not use any tool to press the seal.
5. Calibrate the seals. Use plenty of oil on the seal and gently push the part
to be installed over the seal.

84 (110) Copyright © Sandvik

ID: BG00602127 en-US D.001.1 2018-08-28
HL 820T, HF 820T Rock drill operation, maintenance and repair
instructions

Storage of the seals

Most rubber parts change in physical properties during storage and can
become unserviceable due to hardening, softening, cracking, or other
surface degradation.
Follow these rules to keep the seals in good condition:
• Keep the storage temperature between +0º C and +25º C. If the
temperature goes below +0º C, the seal temperature should be increased
slowly to room temperature, before assembling. Direct contacts to
heaters, ovens, radiators, and direct sunlight should be avoided.
• The relative humidity should be below 70%. Condensation of water
should not occur. Seals should not be stored when they are moist.
• Store parts in individual UV-resistant bags. Direct sunlight or artificial light
with ultraviolet content can be disastrous.
• Keep ventilation low, if the seals are not stored in air tight bags.
• Do not store seals near the apparatus that generates a lot of ozone (e.g.
powerful fluorescent lamp, devices with high tension current, big electric
motors, or devices which can cause electric sparking).
• Store the seals without the tension (e.g. do not keep the seal fitted in a
subassembly like a valve or a cylinder).
• Never wash the rubber seals with solvent. Only use water and soap to
wash, if needed. Do not store seals in contact with dissolvents.
• Do not keep seals in storage for more than five years, even when storing
them in good conditions (as described above). After five years properties
of the seals will be lost gradually, but not totally.

Copyright © Sandvik 85 (110)

ID: BG00602127 en-US D.001.1 2018-08-28
HL 820T, HF 820T Rock drill operation, maintenance and repair
instructions

5.6.21 Assembling the gear housing

11
T8

1 12

1. Install the spherical bearing (11) into the gear housing (1).
NOTE! Check that the roller cage rivets are pointing toward the rear of
the rock drill.
Use a hammer and special tool (T8).
2. Install the U-seal (12) into the gear housing (1).
Check the orientation of the U-seal (12) from the picture.
3. Install the plugs (9 and 10) to the gear housing (1).
Use sealant (example Loctite 542) on the threads.

9
10 1

3
2
4
8

5
6
5

4. Install new O-rings (3 and 4) over the intermediate pin (2).

5. Grease the gear housing grooves for the support plates.
6. Install new support plates (5) to their grooves inside the gear housing (1).
7. Push the intermediate gear pin (2) inside of the gear housing (1).
While pushing put the intermediate gear (6) on the intermediate gear pin
(2). Make sure that the support plates (5) do not drop.
The intermediate gear pin must go up to the O-ring when pushed by
hand. Drive the pin carefully into place with a rubber mallet.

86 (110) Copyright © Sandvik

ID: BG00602127 en-US D.001.1 2018-08-28
HL 820T, HF 820T Rock drill operation, maintenance and repair
instructions

8. Put new lockwashers over the bolts (8).

9. Install and tighten the bolts (8).
See the section “Intermediate gear pin bolts” for the bolt tightening
instructions.
10. Install the lifting eye (D) to flushing housing mounting hole.

B
D

11. Tie the lifting strap to the lifting eye and the hoist.
12. Tighten the lifting strap.
13. Remove the vertical position locking bolt (C).
14. Remove the horizontal position locking bolts (A).
15. Open the latch (B).
16. Lower the assembly stand to a vertical position.
Use a hoist.
17. Lock the position by tightening the locking bolt (C) to its place.
18. Remove the lifting strap.

Copyright © Sandvik 87 (110)

ID: BG00602127 en-US D.001.1 2018-08-28
HL 820T, HF 820T Rock drill operation, maintenance and repair
instructions

5.6.22 Installing the spacing ring and stabilizer pistons

A B
2

1. Install the spacing ring (2) into the gear housing (1).
Place the spacing ring in the gear housing so the rear bearing pins (A) go
into the holes (B) in the spacing ring.
2. Install the long movement piston (3) into the gear housing (1).
Push the long movement piston (3) into the gear housing (1) at the
shorter end first.
3. Install the short movement piston (4) over the long movement piston (3).
NOTE! The short movement piston (4) has to be installed in the correct
way. Position is correct when the short movement piston (4) lubrication
grooves (C) are against the long movement piston (3) shoulder.

88 (110) Copyright © Sandvik

ID: BG00602127 en-US D.001.1 2018-08-28
HL 820T, HF 820T Rock drill operation, maintenance and repair
instructions

5.6.23 Installing the stabilizer spacer

WARNING
CRUSHING HAZARD!
Dropping the spacer may cause severe injury.
When handling the spacer do not let it drop.

WARNING
CRUSHING HAZARD!
Finger(s) squeezing between the spacer and the gear housing may
cause severe injury.
While lowering the spacer to the gear housing do not put your
finger(s) between the spacer and the gear housing.

RISK OF PROPERTY DAMAGE!

Do not use force when lowering the spacer to the gear housing.
NOTICE Forcing the spacer down by hitting or by pushing harder may
damage the bearings.

3 2 4

Copyright © Sandvik 89 (110)

ID: BG00602127 en-US D.001.1 2018-08-28
HL 820T, HF 820T Rock drill operation, maintenance and repair
instructions

1. Install the O-ring (2) onto the gear housing (1).

Use grease to keep the O-ring at its place.
2. Install the O-rings (3, 8 pieces) onto the gear housing (1).
Use grease to keep the O-ring at its place.
3. Install the O-ring (4) onto the gear housing (1).
Use multi-purpose adhesive for rubber (example Loctite 401) to glue the
O-ring to its place.
4. Install the spacer (5) to the gear housing (1).
Lower the spacer slowly, let the mass of the spacer do the work. If the
spacer gets stuck, lift it slightly up and try again.

90 (110) Copyright © Sandvik

ID: BG00602127 en-US D.001.1 2018-08-28
HL 820T, HF 820T Rock drill operation, maintenance and repair
instructions

5.6.24 Installing the body

6
7

1. Install O-rings (5, 4 pieces) onto the spacer (1).

Use grease to keep the O-ring at its place.
2. Install O-rings (6, 2 pieces) onto the spacer (1).
Use grease to keep the O-ring at its place.
3. Install O-ring (7) onto the spacer (1).
Use grease to keep the O-ring at its place.
4. Install O-ring (8) onto the spacer (1).
Use multi-purpose adhesive for rubber (example Loctite 401) to glue the
O-ring to its place.
5. Attach the lifting eyes (E) to the body (2).

2 3

9
1
10

6. Tie lifting strap to the lifting eyes and lifting hook.

7. Lower the body (2) carefully to the spacer (1).
Use a hoist.
8. Lubricate the side bolt threads and cap nut faces with grease.

Copyright © Sandvik 91 (110)

ID: BG00602127 en-US D.001.1 2018-08-28
HL 820T, HF 820T Rock drill operation, maintenance and repair
instructions

9. Install the side bolts (3) and cap nuts (9).

Turn the cap nuts (9) fully closed by tightening with fingers.
10. Install the cap nuts (10).
Leave the cap nuts at the finger tight.
11. Tie the lifting strap to the lifting eye (I) and lifting hook.

12. Remove the horizontal position locking bolts (F).

13. Open the latch (G).
14. Remove the vertical position lock bolt (H).
15. Turn the assembly stand to a horizontal position.
Use a hoist.
16. Secure the assembly stand in a horizontal position with the latch (G).
17. Tighten the bolts (F).
18. Remove the lifting strap.

92 (110) Copyright © Sandvik

ID: BG00602127 en-US D.001.1 2018-08-28
HL 820T, HF 820T Rock drill operation, maintenance and repair
instructions

19. Tighten the cap nuts (10).

See the section “Side bolts” for the tightening instructions.

D A
10
B C

20. Tie the lifting strap to the lifting eye (I) and lifting hook.

G
I

21. Tighten the lifting strap.

Use a hoist.
22. Remove the vertical position locking bolt (H).
23. Remove the horizontal position locking bolts (F).
24. Open the latch (G).
25. Lower the assembly stand to a vertical position.
Use a hoist.
26. Secure the assembly stand in a vertical position with the bolt (H).
27. Remove the lifting strap.

Copyright © Sandvik 93 (110)

ID: BG00602127 en-US D.001.1 2018-08-28
HL 820T, HF 820T Rock drill operation, maintenance and repair
instructions

5.6.25 Assembling the percussion cartridge

Pilot cylinder

1. Install the pilot cylinder O‑rings (1).

Rear bearing

1 2

1. Install the rear bearing piston seals (1).

NOTE! Make sure that the orientation of the seals is correct.
2. Install the rear bearing O-rings (2).

94 (110) Copyright © Sandvik

ID: BG00602127 en-US D.001.1 2018-08-28
HL 820T, HF 820T Rock drill operation, maintenance and repair
instructions

Assembling order of the percussion cartridge

1. Push the rear bearing (4) in the rear cylinder (3).

2. Push the distributor (2) over the piston (1).
3. Push the rear cylinder (3) over the piston (1) and distributor (2).

Copyright © Sandvik 95 (110)

ID: BG00602127 en-US D.001.1 2018-08-28
HL 820T, HF 820T Rock drill operation, maintenance and repair
instructions

5.6.26 Installing the percussion cartridge

1 2

1. Attach the lifting eye (A) to the percussion cartridge (2).

2. Tie the lifting strap to the lifting eye and lifting hook.
3. Apply plenty of oil to the inner surface of the body.
4. Push the front cylinder (1) in to the body.
5. Lower the percussion cartridge (2) carefully to the body.
Use a hoist.

96 (110) Copyright © Sandvik

ID: BG00602127 en-US D.001.1 2018-08-28
HL 820T, HF 820T Rock drill operation, maintenance and repair
instructions

5.6.27 Installing the rear cover

1. Place the O-ring (1) on rear cover.

2. Place the O-ring (2) in groove of the rock drill.
Use multi-purpose adhesive for rubber (example Loctite 401) to glue the
O-ring to its place.
3. Lubricate the bolt (3) threads with thread grease.
4. Put new lockwashers to the bolts (3).
5. Attach the rear cover (4) at the rock drill with the bolts (3).
6. Cross-tighten the bolts (3).
See the section “Rear cover bolts” for the tightening instructions.

Copyright © Sandvik 97 (110)

ID: BG00602127 en-US D.001.1 2018-08-28
HL 820T, HF 820T Rock drill operation, maintenance and repair
instructions

5.6.28 Assembling the hydraulic motor

1. Install the inner ring of the bearing (2) on the shaft (1).
Use a hydraulic press and a suitable tool (A) (hole diameter about 41
mm).
2. Install the shaft seals (4) to the cover (3).
Use a hydraulic press and the special tool (T10).
NOTE! Make sure that the orientation of the seals is correct.

T10

3. Install the circlips to the cover (3).

98 (110) Copyright © Sandvik

ID: BG00602127 en-US D.001.1 2018-08-28
HL 820T, HF 820T Rock drill operation, maintenance and repair
instructions

4. Attach the rotation shaft (1) to the cover (3).

Use special tool (T11).
NOTE! Do not push shaft so far that front seal goes over the shaft’s
sealing surface.

1 T11 3

5. Remove the tool (T11).

6. Install the bearing (5) on the rotation shaft (1).

1 5 6 7

7. Install the new locking plate (6) on the rotation shaft (1).
8. Put locking adhesive (example Loctite 2701) to the locking nut (7) thread.
9. Tighten the lock nut (7) to 200 Nm (20 kpm).
10. Secure the lock nut (7) with tabs of the locking plate (6).
See the picture.

Copyright © Sandvik 99 (110)

ID: BG00602127 en-US D.001.1 2018-08-28
HL 820T, HF 820T Rock drill operation, maintenance and repair
instructions

11. Install the O-ring (8) on the cover (3).

12
9
10
8
3
1
11

12. Install the O-ring (9) on the bearing housing (12).

13. Install the thrust plate (10) (if removed) in the rotation shaft (1).
14. Install the rotation shaft assembly in the bearing housing (12).
15. Put new lockwashers on the bolts (11).
16. Put locking adhesive (example Loctite 2701) to the bolt (11) threads.
17. Pre-tighten the cover bolts (11) to 10 Nm (1 kpm).
Use crosswise pattern.
18. Final tighten the cover bolts (11) to 32 Nm (3.2 kpm).
Use crosswise pattern.

100 (110) Copyright © Sandvik

ID: BG00602127 en-US D.001.1 2018-08-28
HL 820T, HF 820T Rock drill operation, maintenance and repair
instructions

5.6.29 Installing the hydraulic motor

1. Install O-ring (2) on the groove of the gear housing.

Use multi-purpose adhesive for rubber (example Loctite 401) to glue the
O-ring to its place.
2. Install the hydraulic motor (1) to the gear housing.
3. Lubricate the bolt (3) threads with the thread grease.
4. Tighten the bolts (3).
See the section “Hydraulic motor mounting bolts“ for the bolt tightening
instructions.

Copyright © Sandvik 101 (110)

ID: BG00602127 en-US D.001.1 2018-08-28
HL 820T, HF 820T Rock drill operation, maintenance and repair
instructions

5. Install the lifting eye (D) to flushing housing mounting hole.

D A

6. Tie the lifting strap to the lifting eye (D) and lifting hook.
7. Remove the vertical position locking bolt (C).
8. Remove the horizontal position locking bolts (B).
9. Open the latch (A).
10. Turn the assembly stand to horizontal position.
Use a hoist.
11. Secure the assembly stand in a horizontal position with the latch (A).
12. Tighten the bolts (B).
13. Remove the lifting strap.

102 (110) Copyright © Sandvik

ID: BG00602127 en-US D.001.1 2018-08-28
HL 820T, HF 820T Rock drill operation, maintenance and repair
instructions

5.6.30 Installing the pressure accumulators

6 5 1
4

3 2

3
6

1. Place the O-rings (3) on the accumulators (2).

2. Place the O-ring (4) in the rock drill.
3. Place the O-rings (6) on the faces of the rock drill.
Use multi-purpose adhesive for rubber (example Loctite 401) to glue the
O-ring to its place.
4. Place the gasket plate (5) on the face of the rock drill.
5. Attach the accumulators (2) to the rock drill.
Install the high pressure accumulator to the right side of the rock drill and
the low-pressure accumulator to the left side.
Use the rubber mallet to drive the accumulators into place.
6. Lubricate the bolt (7) threads with thread grease.
7. Tighten the bolts.
See the section “Accumulator bolts” for the bolt tightening instructions.

Copyright © Sandvik 103 (110)

ID: BG00602127 en-US D.001.1 2018-08-28
HL 820T, HF 820T Rock drill operation, maintenance and repair
instructions

5.6.31 Attaching the flushing housing

6
7
5
4
3
2
1

1. Push the rotation bushing (6) into the rock drill.

2. Tighten the locking screw (8) to secure the rotation bushing (6).
Do not turn the locking screw too much. Turning the locking screw too
deep prevents the installation of the chuck (7) and the coupling (5).
3. Push the chuck (7) into the rotation bushing (6).
Note the orientation of the chuck (7). Push the chuck in the rotation
bushing at the grooved end first.
4. Push the coupling (5) into rotation bushing (6).
5. Tighten the locking screw (8).
6. Push the shank (4) carefully into place in the flushing housing (1).
NOTE! Do not damage the U-seals while pushing the shank.
7. Place the gasket plate (3) on the face of the rock drill.
8. Put new O-ring on the flushing housing.
9. Fasten the flushing housing (2) to the rock drill.
10. Put new lockwashers onto the bolts (1).
11. Lubricate the bolt (1) threads with grease.
12. Tighten the bolts (1).
See the section "Flushing housing front cover bolts" for the bolt
tightening instructions.

104 (110) Copyright © Sandvik

ID: BG00602127 en-US D.001.1 2018-08-28
HL 820T, HF 820T Rock drill operation, maintenance and repair
instructions

5.6.32 Pressurizing the accumulators

WARNING
HIGH PRESSURE HAZARD!
A high pressure gas discharge could cause death or severe injury.
Before pressurizing a pressure accumulator, install it to the rock
drill. Do not pressurize a pressure accumulator if it is not installed to
a rock drill.

See detailed instructions for pressurizing the accumulators from the manual
Pressure accumulator for Hydraulic rock drill; Maintenance instructions.

5.7 Special tools

150 746 48
G1
Ø 36 x 4.37

096 904 68 152 501 38

T1 T2
200 x 40 Ø 120 x 32

152 586 48 152 585 18

T3 T4
Ø 158 x 101 Ø 126 x 55

151 738 08
150 736 38 Ø 50 x 265
T5 T6
10 x 50 Male M22
Female M20

Copyright © Sandvik 105 (110)

ID: BG00602127 en-US D.001.1 2018-08-28
HL 820T, HF 820T Rock drill operation, maintenance and repair
instructions

092 864 58 087 853 38

T7 T8
M16 Ø 51 x 210

152 583 68
152 537 28
T9 Ø 39.5 x 210 T10
Ø 100 x 23
M16

152 497 58 096 876 58

T11 T12
Ø 65 x 100 150 x 124

150 175 88
152 098 78
T13 T14 Ø 56 x 75
Ø 95 x 46
M22

150 738 98
085 964 88
T15 Ø 86 x 40 T16
Ø 53 x 110
M22

087 856 18 150 737 68

T17 T18
Ø 110 x 120 Ø 89 x 50

152 589 28 093 149 98

T19 T20
Ø 100 x 119 52 x 30

106 (110) Copyright © Sandvik

ID: BG00602127 en-US D.001.1 2018-08-28
HL 820T, HF 820T Rock drill operation, maintenance and repair
instructions

088 274 28
550 296 09 Hex 24 x 75
T21 T22
Ø 119 x 180 Male M12
Female M16

550 296 12 550 296 17

T23 T24
Ø 109 x 30 Ø 84 x 105

551 505 36 550 296 10

T25 T26
Ø 98 x 95 Ø 95 x 88

088 257 98
150 791 58
Hex 24 x 92
T27 T28 Ø 114 x 30
Male M10
M22
Female M16

Copyright © Sandvik 107 (110)

ID: BG00602127 en-US D.001.1 2018-08-28
HL 820T, HF 820T Rock drill operation, maintenance and repair
instructions

This page is intentionally left blank

108 (110) Copyright © Sandvik

ID: BG00602127 en-US D.001.1 2018-08-28
www.sandvik.com
 Traducción de las instrucciones originales
BG00264521 es-ES E.001.1 2019-01-10

Acumuladores de presión para

martillos perforadores hidráulicos,
instrucciones de mantenimiento
Acumuladores de presión para martillos perforadores hidráulicos,
instrucciones de mantenimiento

ADVERTENCIA
PELIGRO EN CASO DE INOBSERVANCIA DE LAS INSTRUCCIONES
A fin de evitar la muerte o graves lesiones, usted TIENE que leer,
comprender y seguir detalladamente los manuales de mantenimiento
y del operario antes de instalar, inspeccionar, operar, revisar,
comprobar, limpiar, transportar, guardar, desmontar o eliminar el
producto, o una parte o accesorio del producto. Guardar esta
publicación para futuras referencias.

Copyright © Sandvik
ID: BG00264521 es-ES E.001.1 2019-01-10
Acumuladores de presión para martillos perforadores hidráulicos,
instrucciones de mantenimiento

Esta página se ha dejado en blanco intencionadamente

Copyright © Sandvik
ID: BG00264521 es-ES E.001.1 2019-01-10
Acumuladores de presión para martillos perforadores hidráulicos,
instrucciones de mantenimiento

Índice de contenidos

1 Introducción .................................................................. 7
1.1 Objetivo de estas instrucciones ..........................................................7
1.1.1 Validez de los manuales ..............................................................7

2 Instrucciones de seguridad y protección del medio

ambiente ........................................................................ 9
2.1 Precauciones de seguridad ................................................................. 9

3 Mantenimiento y reparación del acumulador .............11

3.1 Acumuladores de presión ....................................................................11
3.2 Manómetros .......................................................................................... 12
3.3 Comprobación de la presión del gas de carga de un acumulador
de presión ..............................................................................................12
3.4 Extracción de los acumuladores de presión ..................................... 13
3.5 Desmontaje del acumulador de presión .............................................14
3.6 Comprobación del acumulador de presión ........................................16
3.7 Montaje del acumulador .......................................................................17
3.8 Llenado de los acumuladores ............................................................. 19
3.8.1 Instrucciones de llenado ..............................................................21
3.8.2 Presiones de llenado de los acumuladores .................................22
3.9 Montaje del acumulador de presión en el martillo perforador ......... 25

Copyright © Sandvik
ID: BG00264521 es-ES E.001.1 2019-01-10
Acumuladores de presión para martillos perforadores hidráulicos,
instrucciones de mantenimiento

Esta página se ha dejado en blanco intencionadamente

Copyright © Sandvik
ID: BG00264521 es-ES E.001.1 2019-01-10
Acumuladores de presión para martillos perforadores hidráulicos,
instrucciones de mantenimiento

1 INTRODUCCIÓN
1.1 Objetivo de estas instrucciones
Este manual contiene información complementaria para el funcionamiento,
el mantenimiento y la reparación de componentes.
Antes del uso, o de realizar tareas de mantenimiento o reparaciones del
componente o el sistema descrito en este manual, debe leer y comprender
la información descrita en los manuales del operario y de mantenimiento
suministrados con la máquina. Preste especial atención a la información de
seguridad del capítulo "2. Instrucciones de seguridad y protección del
medio ambiente" de estos manuales.
1.1.1 Validez de los manuales
Este manual, y especialmente la información relativa a la seguridad, sólo
es válido si no se realizan modificaciones no autorizadas en el producto.
Este documento describe el producto tal como el fabricante lo ha
desarrollado y entregado al cliente. En este documento no se reflejan las
modificaciones y mejoras realizadas después.
Si surgen dudas en relación a su producto o a este manual, no dude en
ponerse en contacto con su representante local de Sandvik, que le
proporcionará la última información disponible.

Copyright © Sandvik 7 (28)

ID: BG00264521 es-ES E.001.1 2019-01-10
Acumuladores de presión para martillos perforadores hidráulicos,
instrucciones de mantenimiento

Esta página se ha dejado en blanco intencionadamente

8 (28) Copyright © Sandvik

ID: BG00264521 es-ES E.001.1 2019-01-10
Acumuladores de presión para martillos perforadores hidráulicos,
instrucciones de mantenimiento

2 INSTRUCCIONES DE SEGURIDAD Y PROTECCIÓN DEL

MEDIO AMBIENTE
2.1 Precauciones de seguridad
Los procedimientos de funcionamiento, mantenimiento y ajuste
deben ser realizadas solamente por personal con formación
especializada en su funcionamiento y mantenimiento. Antes de
utilizar el componente o realizar las tareas de servicio del mismo, lea
las instrucciones de funcionamiento, mantenimiento y seguridad y
asegúrese de comprenderlas.

Copyright © Sandvik 9 (28)

ID: BG00264521 es-ES E.001.1 2019-01-10
Acumuladores de presión para martillos perforadores hidráulicos,
instrucciones de mantenimiento

Esta página se ha dejado en blanco intencionadamente

10 (28) Copyright © Sandvik

ID: BG00264521 es-ES E.001.1 2019-01-10
Acumuladores de presión para martillos perforadores hidráulicos,
instrucciones de mantenimiento

3 MANTENIMIENTO Y REPARACIÓN DEL ACUMULADOR

3.1 Acumuladores de presión

ADVERTENCIA
PELIGRO DE EXPLOSIÓN
Un acumulador de presión reparado de forma incorrecta puede
explotar y causar la muerte o lesiones graves.
Queda terminantemente prohibido reparar un acumulador de presión
mediante soldadura o cualquier otro procedimiento incorrecto.
Sustituya un acumulador de presión averiado por otro nuevo.

ADVERTENCIA
PELIGRO: ALTA PRESIÓN
Una fuga de aire a alta presión podría causar la muerte o lesiones
graves.
Antes de retirar el acumulador de presión del martillo perforador,
descargue la presión abriendo la válvula de llenado.
Antes de presurizar el acumulador de presión, instálelo en el martillo
perforador. No presurice un acumulador si no está instalado en un
martillo perforador.
Si se usa un manómetro, el puerto de descarga debe estar orientado
a un espacio acotado para evitar que sufran lesiones por descarga
de presión las personas situadas en los alrededores.

En todos los sistemas hidráulicos, la limpieza es el factor más importante

para garantizar un funcionamiento sin problemas. Por ello, los
acumuladores de presión deben llenarse y someterse a mantenimiento en
un entorno limpio y sin polvo.
Cada vez que se desmonte un acumulador de presión y/o cuando haya
excedido el tiempo para el mantenimiento del equipo de perforación,
debería comprobar el estado del acumulador de presión. El kit de
herramientas especial del martillo perforador contiene todas las
herramientas necesarias para las tareas de servicio y comprobación de los
acumuladores de presión.
La experiencia ha demostrado que el primer (colocado originalmente)
diafragma del acumulador de presión no alcanzará la durabilidad normal,
especialmente si transcurre un largo período de tiempo entre la
presurización y la puesta en marcha. Por ello, los acumuladores de presión
que se entregan como recambios están despresurizados, algo que también
se indica en el acumulador.

Copyright © Sandvik 11 (28)

ID: BG00264521 es-ES E.001.1 2019-01-10
Acumuladores de presión para martillos perforadores hidráulicos,
instrucciones de mantenimiento

La parte inferior y la cubierta de cada acumulador deben mantenerse como

par. Sandvik entrega todas las cubiertas y partes inferiores de los
acumuladores como pares. Otras piezas, como diafragmas y válvulas de
llenado, se entregan por separado.

3.2 Manómetros

ADVERTENCIA
PELIGRO: ALTA PRESIÓN
El material proyectado puede causar lesiones graves.
Utilice solo indicadores destinados a la medición de presión de gas
al comprobar o presurizar los acumuladores. El cristal de un
manómetro amortiguado por líquido puede romperse bajo presión y
salir despedido a alta velocidad.

Manómetro indicado para la medición de la presión del gas

Punto de rotura por sobrepresión de un manómetro de gas

Si la presión en el interior del manómetro de gas es demasiado alta (como
resultado de la rotura de un tubo en el interior del manómetro), la parte
posterior del manómetro (A) se rompe y alivia la presión.
El manómetro debe sustituirse si el indicador de la parte trasera del
manómetro está roto.

3.3 Comprobación de la presión del gas de carga de un acumulador

de presión
La presión del gas de carga de un acumulador de presión debe
comprobarse cada 50 horas o antes si es necesario.

12 (28) Copyright © Sandvik

ID: BG00264521 es-ES E.001.1 2019-01-10
Acumuladores de presión para martillos perforadores hidráulicos,
instrucciones de mantenimiento

La comprobación se realiza usando el manómetro que se incluye en el kit

de herramientas especiales del martillo perforador. El rango del manómetro
es de 0 a 100 bares para los acumuladores de alta presión, y de 0 a 10
bares para los acumuladores de baja presión.

4
3
2
1

1. Retire el tapón de protección de goma (1) o el tapón metálico (2).

2. Atornille el manómetro a la válvula de llenado (4).
3. Afloje la contratuerca (3).
4. Espere hasta que el indicador del manómetro se detenga y compruebe
la lectura.
Si la lectura es baja, consulte 3.8.1 Instrucciones de
llenado (Página 21) para saber cómo rellenar el acumulador.
5. Apriete la contratuerca (3).
Mediante una llave dinamométrica, apriete la contratuerca a 15 Nm
(1,5 kpm).
6. Desconecte el manómetro de la válvula de llenado (4).
7. Coloque el tapón de protección de goma (1) o el tapón metálico (2) de
nuevo en su lugar.

3.4 Extracción de los acumuladores de presión

ADVERTENCIA
PELIGRO POR ALTA PRESIÓN.
Una fuga de gas de alta presión podría causar la muerte o lesiones
graves.
Asegúrese de que se haya descargado la presión del acumulador
antes de retirar el acumulador del martillo perforador.

Antes de retirar los acumuladores de presión del martillo perforador,

despresurice los acumuladores abriendo las válvulas de llenado. Queda
prohibida la presencia de personal delante de la válvula cuando ésta vaya
abrirse.

Copyright © Sandvik 13 (28)

ID: BG00264521 es-ES E.001.1 2019-01-10
Acumuladores de presión para martillos perforadores hidráulicos,
instrucciones de mantenimiento

1. Abra las válvulas de llenado.

2. Extraiga los pernos de montaje del acumulador.
3. Extraiga los acumuladores.
4. Extraiga las juntas tóricas.
5. Extraiga las placas de junta.
6. Inserte tapones de protección en las aberturas del martillo perforador.

3.5 Desmontaje del acumulador de presión

PELIGRO
PELIGRO DE EXPLOSIÓN
La explosión de un acumulador de presión puede provocar graves
lesiones, e incluso la muerte.
Nunca caliente un acumulador a temperaturas superiores a los
100 °C.

14 (28) Copyright © Sandvik

ID: BG00264521 es-ES E.001.1 2019-01-10
Acumuladores de presión para martillos perforadores hidráulicos,
instrucciones de mantenimiento

ADVERTENCIA
¡PELIGRO POR ALTA PRESIÓN Y MATERIALES PROYECTADOS!
El desmontaje de un acumulador presurizado causará una descarga
de gas de alta presión y proyección de materiales, lo que podría
provocar la muerte o graves lesiones.
No desmonte un acumulador presurizado.
Si no se puede despresurizar un acumulador, debe desecharse
correctamente.
No intente despresurizar un acumulador mediante métodos
inadecuados, por ejemplo, perforando un orificio a través del
diafragma.

ADVERTENCIA
¡PELIGRO POR ALTA PRESIÓN Y MATERIALES PROYECTADOS!
El uso de métodos de trabajo incorrectos puede provocar una
descarga de gas de alta presión y la proyección de materiales, lo que
podría provocar la muerte o graves lesiones.
No utilice ningún método distinto a los indicados en este manual
para despresurizar o desmontar un acumulador.
No realice un orificio en el diafragma ni en ninguna otra pieza de un
acumulador.

1. Fije el soporte (1) en una prensa de banco.

2. Coloque el acumulador en el soporte, con la parte inferior orientada
hacia arriba.
3. Asegúrese de que la válvula de llenado esté abierta.

Copyright © Sandvik 15 (28)

ID: BG00264521 es-ES E.001.1 2019-01-10
Acumuladores de presión para martillos perforadores hidráulicos,
instrucciones de mantenimiento

4. Al desmontar un acumulador de vástago, asegúrese de que no haya

presión en el interior del acumulador pulsando el vástago. El vástago
debe moverse hacia dentro libremente.

Si el vástago no se mueve, no abra el acumulador.

5. Abra la parte inferior del acumulador usando la herramienta especial (2).
La cubierta y la parte inferior de un acumulador de presión están
marcados con el mismo número, y deben mantenerse unidos por pares.

3.6 Comprobación del acumulador de presión

ADVERTENCIA
¡PELIGRO POR ALTA PRESIÓN Y EXPLOSIÓN!
La rotura de un acumulador de presión desgastado o dañado puede
provocar la muerte o lesiones graves.
Todo acumulador de presión que presente daños deberá ser
desechado.
Si las roscas del acumulador de presión están corroídas, debe
desecharse.

1. Limpie con cuidado y compruebe la rosca.

2. Lleve a cabo una comprobación visual interna y externa del acumulador
frente a desgastes, daños y corrosión.
3. En caso necesario, realice una comprobación de penetración de fluido
para asegurarse de que el acumulador no presenta daños.

16 (28) Copyright © Sandvik

ID: BG00264521 es-ES E.001.1 2019-01-10
Acumuladores de presión para martillos perforadores hidráulicos,
instrucciones de mantenimiento

3.7 Montaje del acumulador

ADVERTENCIA
¡PELIGRO POR ALTA PRESIÓN Y EXPLOSIÓN!
La rotura de un acumulador de presión desgastado o dañado puede
provocar la muerte o lesiones graves.
Un acumulador de presión con demasiado desgaste o dañado se
debe sustituir inmediatamente.

1 2

1. Compruebe el número de la cubierta y de la parte inferior.

Nota: El número de la cubierta y de la base deben ser iguales.

Los acumuladores de alta presión están marcados con números impares

y los de baja presión con números pares.

Copyright © Sandvik 17 (28)

ID: BG00264521 es-ES E.001.1 2019-01-10
Acumuladores de presión para martillos perforadores hidráulicos,
instrucciones de mantenimiento

2. Inserte un diafragma nuevo o revisado en la cubierta.

Compruebe que el diafragma está en la ranura y colocado de forma que
el lado adecuado esté orientado hacia abajo.
Siempre que cambie el diafragma del acumulador deberá cambiar
también las juntas tóricas.

3. Lubrique la superficie del diafragma (a) y la superficie inferior del

acumulador (b) con vaselina o lanolina.
4. Lubrique la rosca de la base con vaselina o lanolina.
5. Mediante una llave dinamométrica y la herramienta especial, apriete la
parte inferior a 150 Nm (15 kpm).
6. Sustituya la válvula de llenado.

18 (28) Copyright © Sandvik

ID: BG00264521 es-ES E.001.1 2019-01-10
Acumuladores de presión para martillos perforadores hidráulicos,
instrucciones de mantenimiento

Compruebe siempre las marcas del límite de desgaste de la rosca después

de apretar la base. Si la marca (I) de la parte inferior queda entre el punto
(•) y la marca (R) en la cubierta, significa que la rosca es correcta.
No obstante, si la marca (I) en la base queda detrás de la marca (R),
significa que las roscas de la base y la cubierta del acumulador están
demasiado desgastadas. Sustituya el acumulador y deseche el viejo.
Si el acumulador no puede retener el gas de carga tras cambiar el
diafragma y la válvula de llenado, compruebe a fondo el roscado, la parte
inferior y el cuerpo del acumulador, por ejemplo, con una prueba de
penetración de líquido.

3.8 Llenado de los acumuladores

ADVERTENCIA
PELIGRO: ALTA PRESIÓN
Una fuga de aire a alta presión podría causar la muerte o lesiones
graves.
Antes de presurizar el acumulador de presión, instálelo en el martillo
perforador. No presurice un acumulador si no está instalado en un
martillo perforador.

ADVERTENCIA
PELIGRO POR ALTA PRESIÓN.
La rotura del acumulador durante el llenado de un acumulador
dañado o desgastado podría causar la muerte o lesiones graves.
No cargue un acumulador no verificado o muy desgastado.

Copyright © Sandvik 19 (28)

ID: BG00264521 es-ES E.001.1 2019-01-10
Acumuladores de presión para martillos perforadores hidráulicos,
instrucciones de mantenimiento

ADVERTENCIA
¡PELIGRO DE EXPLOSIÓN!
Un acumulador lleno de un tipo de gas incorrecto podría explotar y
causar la muerte o lesiones graves.
Utilice únicamente nitrógeno (N2) para llenar un acumulador de
presión.

20 (28) Copyright © Sandvik

ID: BG00264521 es-ES E.001.1 2019-01-10
Acumuladores de presión para martillos perforadores hidráulicos,
instrucciones de mantenimiento

3.8.1 Instrucciones de llenado

12 9 8 7 6 5 3 2

11 10 13,14 15 4 1

1 Cuerpo del acumulador 2 Válvula de carga

3 Contratuerca 4 Tapón
5 Vástago de acoplamiento rá- 6 Manguito de acoplamiento
pido rápido
7 Manguera 8 Manómetro del acumulador
de presión
9 Manómetro de la bombona 10 Válvula reductora de presión
de gas
11 Válvula reguladora de pre- 12 Válvula de cierre
sión
13 Adaptador 14 Junta
15 Adaptador acodado

1. Retire el tapón (4).

2. Atornille el adaptador acodado (15) a la válvula de llenado (2).
3. Empuje el manguito de acoplamiento rápido (6) en el vástago (5).
4. Afloje la contratuerca (3).
5. Abra la válvula reguladora de presión (11).
6. Abra la válvula de la botella de nitrógeno (12).
La presión de la bombona se indica en el manómetro (9).
7. Ajuste la presión en el acumulador de baja presión de 5 a 10 bares
girando la válvula reguladora (11).
El manómetro (8) indica la presión del acumulador. Ajuste la presión de
acuerdo con el paso 15.
8. Ajuste la presión en el acumulador de A.P. con la válvula de control de
presión (11), de acuerdo con las instrucciones.
El manómetro (8) indica la presión del acumulador. La presión máxima
se marca en el acumulador.

Copyright © Sandvik 21 (28)

ID: BG00264521 es-ES E.001.1 2019-01-10
Acumuladores de presión para martillos perforadores hidráulicos,
instrucciones de mantenimiento

9. Ajuste la presión del acumulador estabilizador mediante la válvula de

control de la presión, según las instrucciones.
El manómetro (8) indica la presión del acumulador.
10. Cierre la válvula de llenado (2) girando la contratuerca (3).
11. Cierre la válvula de la botella de nitrógeno (12).
12. Abra la válvula reguladora de presión (11).
13. Desconecte los acoplamientos rápidos (5) y (6).
14. Retire el adaptador acodado (15) de la válvula de llenado (2).
15. Monte el manómetro de comprobación (0-10 bares) en la válvula de
carga del acumulador de baja presión (2) y, abriendo la contratuerca
(3), deje escapar la presión hasta que el manómetro indique una
presión de 3-5 bares.
16. Apriete la contratuerca (3) a 15 Nm (1,5 kpm).
17. Vuelva a colocar el tapón (4).
3.8.2 Presiones de llenado de los acumuladores

Acumulador de baja presión (LP)

El acumulador de baja presión amortigua las vibraciones hidráulicas en el
circuito de retorno. Además, evita la cavitación en los canales y las líneas
de retorno.
Para obtener el rendimiento óptimo de un acumulador de baja presión, la
presión del gas del acumulador debe ser la mitad de la presión de la línea
de retorno. Normalmente, un acumulador de baja presión está presurizado
a 3-5 bares.

22 (28) Copyright © Sandvik

ID: BG00264521 es-ES E.001.1 2019-01-10
Acumuladores de presión para martillos perforadores hidráulicos,
instrucciones de mantenimiento

Acumulador de alta presión (HP)

La función principal del acumulador de alta presión es la de almacenar el
aceite presurizado durante la carrera de retorno del pistón. Esta presión
acumulada puede utilizarse durante la siguiente carrera del pistón.
Otro de las funciones importantes es la de amortiguar vibraciones.
La presión del gas del acumulador de alta presión deberá ajustarse a la
presión de percusión máxima determinada, de acuerdo al siguiente gráfico.

Diafragma tipo vástago

1 Límite superior A Presión de carga
2 Límite inferior B Presión de percusión

Copyright © Sandvik 23 (28)

ID: BG00264521 es-ES E.001.1 2019-01-10
Acumuladores de presión para martillos perforadores hidráulicos,
instrucciones de mantenimiento

100

90

80

70

60 1

50

40
2
30

20

10

A 0
bar 100 120 140 160 180 200 220
B
Diafragma normal (sin vástago)
1 Límite superior A Presión de carga
2 Límite inferior B Presión de percusión

Presión del acumulador estabilizador

RD414 30 bares
HLX5 T 8 bares
HFX5 T 8 bares
RD520/RD525/RD535 30 bares
Serie HL810 30 bares
HL820T / HF820T 30 bares
RD921S/RD925M/RD927L
40 bares
RD921S-C/RD925M-C/RD927L-C
HL1060 40 bares
HL1500 50 bares
HL1560T / HF1560T / HL1560ST 40 bares
RD1635C 40 bares

24 (28) Copyright © Sandvik

ID: BG00264521 es-ES E.001.1 2019-01-10
Acumuladores de presión para martillos perforadores hidráulicos,
instrucciones de mantenimiento

3.9 Montaje del acumulador de presión en el martillo perforador

Nota: Las posiciones de los acumuladores de alta y baja presión, en
relación con el cuerpo del martillo perforador, pueden cambiar entre
diferentes modelos de martillo perforador. Compruebe las
posiciones correctas en el manual de servicio del martillo perforador
en cuestión.

1. Retire los tapones del puerto de conexión del acumulador

2. Limpie las superficies de unión tanto en el acumulador como en el
martillo perforador.
3. Asegúrese de que los pernos se muevan con facilidad en sus orificios
roscados en el cuerpo del martillo.
4. Lubrique las roscas de los pernos con grasa.
5. Monte el anillo tórico y la junta de estanqueidad.
6. Mediante una llave dinamométrica, preapriete los pernos del acumulador
a 100 Nm (10 kpm).
El acumulador de cuatro pernos debe apretarse mediante el método de
apriete “en cruz” 1-2-3-4.

1
3

4 2

7. Mediante una llave dinamométrica, apriete los pernos a 200 Nm

(20 kpm).
El acumulador de cuatro pernos debe apretarse mediante el método de
apriete “en cruz” 1-2-3-4.

Copyright © Sandvik 25 (28)

ID: BG00264521 es-ES E.001.1 2019-01-10
Acumuladores de presión para martillos perforadores hidráulicos,
instrucciones de mantenimiento

Esta página se ha dejado en blanco intencionadamente

26 (28) Copyright © Sandvik

ID: BG00264521 es-ES E.001.1 2019-01-10
www.sandvik.com
 Traducción de las instrucciones originales
BG00309898 es-ES B.001.1 2017-03-02

Instrucciones de reparación de los

motores hidráulicos OMSU, OMT y
MTA
Instrucciones de reparación de los motores hidráulicos OMSU, OMT y
MTA

ADVERTENCIA
PELIGRO EN CASO DE INOBSERVANCIA DE LAS
INSTRUCCIONES
A fin de evitar la muerte o graves lesiones, usted TIENE
que leer, comprender y seguir detalladamente los
manuales de mantenimiento y del operario antes de
instalar, inspeccionar, operar, revisar, comprobar, limpiar,
transportar, guardar, desmontar o eliminar el producto, o
una parte o accesorio del producto. Guardar esta
publicación para futuras referencias.

Copyright © Sandvik
ID: BG00309898 es-ES B.001.1 2017-03-02
Instrucciones de reparación de los motores hidráulicos OMSU, OMT y
MTA

Esta página se ha dejado en blanco intencionadamente

Copyright © Sandvik
ID: BG00309898 es-ES B.001.1 2017-03-02
Instrucciones de reparación de los motores hidráulicos OMSU, OMT y
MTA

Índice de contenidos

1 Introducción .................................................................. 7
1.1 Objetivo de estas instrucciones ..........................................................7
1.1.1 Validez de los manuales ..............................................................7

2 Instrucciones de seguridad y medioambientales ...... 9

2.1 Precauciones de seguridad ................................................................. 9

3 Instrucciones de reparación ........................................ 11

3.1 Reparación ............................................................................................ 11
3.2 Comprobación del motor ..................................................................... 11
3.3 Reglaje del motor ..................................................................................11
3.4 Motores hidráulicos OMSU ..................................................................13
3.4.1 Ensamblaje del motor ..................................................................14
3.4.2 Instalación de los cojinetes ......................................................... 15
3.5 Motores hidráulicos OMT .....................................................................16
3.5.1 Sujeción de la rueda dentada ......................................................17
3.6 Motores hidráulicos MTA ..................................................................... 18

Copyright © Sandvik
ID: BG00309898 es-ES B.001.1 2017-03-02
Instrucciones de reparación de los motores hidráulicos OMSU, OMT y
MTA

Esta página se ha dejado en blanco intencionadamente

Copyright © Sandvik
ID: BG00309898 es-ES B.001.1 2017-03-02
Instrucciones de reparación de los motores hidráulicos OMSU, OMT y
MTA

1 INTRODUCCIÓN
1.1 Objetivo de estas instrucciones
Este manual contiene información complementaria para la utilización,
mantenimiento y reparación de un componente.
Antes de la utilización o la realización de procedimientos de mantenimiento
o reparación para el componente o sistema descritos en este manual, debe
leer y entender la información en los manuales de mantenimiento y del
operario suministrados con la máquina. Preste especial atención a la
información de seguridad del capítulo 2 "Instrucciones de seguridad y
medioambientales" de dichos manuales.
1.1.1 Validez de los manuales
Este manual, y especialmente la información relativa a la seguridad, sólo
es válido si no se realizan modificaciones no autorizadas en el producto.
El desarrollo y la mejora continuos en el diseño de nuestros productos
pueden haber provocado cambios en su producto, que no estén reflejados
en esta publicación. Tenga también en cuenta que si un tercero ha
realizado cambios en el producto tras su entrega por parte del fabricante,
esta publicación no incluye información sobre dichos cambios o su
influencia en el producto.
Si surgen dudas en relación a su producto o a este manual, no dude en
ponerse en contacto con su representante local de Sandvik, que le
proporcionará la última información disponible.

Copyright © Sandvik 7 (20)

ID: BG00309898 es-ES B.001.1 2017-03-02
Instrucciones de reparación de los motores hidráulicos OMSU, OMT y
MTA

Esta página se ha dejado en blanco intencionadamente

8 (20) Copyright © Sandvik

ID: BG00309898 es-ES B.001.1 2017-03-02
Instrucciones de reparación de los motores hidráulicos OMSU, OMT y
MTA

2 INSTRUCCIONES DE SEGURIDAD Y
MEDIOAMBIENTALES
2.1 Precauciones de seguridad

ADVERTENCIA
SE REQUIEREN HABILIDADES TÉCNICAS ESPECIALES
Los procedimientos de mantenimiento incorrectos podrían causar
lesiones graves.
No realice ninguna tarea de mantenimiento si no cuenta con la
formación necesaria para ello. Siga las instrucciones en todo
momento. Use equipos de protección personal adecuados para cada
tarea.

Copyright © Sandvik 9 (20)

ID: BG00309898 es-ES B.001.1 2017-03-02
Instrucciones de reparación de los motores hidráulicos OMSU, OMT y
MTA

Esta página se ha dejado en blanco intencionadamente

10 (20) Copyright © Sandvik

ID: BG00309898 es-ES B.001.1 2017-03-02
Instrucciones de reparación de los motores hidráulicos OMSU, OMT y
MTA

3 INSTRUCCIONES DE REPARACIÓN
3.1 Reparación
Con el fin de garantizar un uso continuado y eficaz, la limpieza debe ser
primordial en todas las tareas de mantenimiento y reparación que se
realicen en el equipo hidráulico. Recomendamos que todas las tareas de
mantenimiento y reparación de los motores hidráulicos se lleven a cabo en
una sala limpia y sin polvo.
Cuando desmonte un motor hidráulico, recuerde sustituir todas las juntas y
anillos tóricos.

3.2 Comprobación del motor

2 1

Válvula de retención
Compruebe el estado de la bola (1) y las superficies de la válvula (2). Si
presentan deterioros, la válvula presentará fugas y el motor tendrá que
sustituirse.
Juego de ruedas dentadas
Si las piezas presentan roturas o señales de gripado del motor, o si el
juego de ruedas dentadas está excesivamente desgastado, el motor debe
sustituirses. Retenga e instale el anillo exterior e interior del mismo juego
de ruedas dentadas como un par.

3.3 Reglaje del motor

• Coloque la placa de válvula (1) en la parte superior de la placa de
equilibrio, y marque (con tiza o tinta) una ranura de dirección que esté
alineada con el orificio (A) del cerco externo de la válvula.

Copyright © Sandvik 11 (20)

ID: BG00309898 es-ES B.001.1 2017-03-02
Instrucciones de reparación de los motores hidráulicos OMSU, OMT y
MTA

• Marque la parte inferior de la ranura del eje de dirección de la válvula.

Coloque el eje de dirección de la válvula de forma que la parte inferior de
la ranura marcada quede alineada con la ranura marcada en la válvula, y
las ranuras más anchas (5 mm) queden dentro de la válvula. Coloque la
placa de canal en su lugar correspondiente, presionándola.
• Marque el rotor interno con la parte inferior de la ranura que actúa contra
la parte inferior de las ranuras exteriores. Monte el juego de ruedas
dentadas y alinee el rotor (3) de manera que la marca quede alineada
con la parte inferior de la ranura marcada del eje de dirección de la
válvula. Gire el rotor en sentido antihorario hasta que las ranuras
coincidan con las ranuras del eje de dirección.

12 (20) Copyright © Sandvik

ID: BG00309898 es-ES B.001.1 2017-03-02
Instrucciones de reparación de los motores hidráulicos OMSU, OMT y
MTA

3.4 Motores hidráulicos OMSU

2 3 4 5 3 6 7 8 6

9 10
11 12 13 14
15 16
17 18
19 20
21 22
23
24

El juego de juntas del motor incluye las piezas 2, 6, 14 y 15. Consulte el

manual de piezas de repuesto.
RIESGO DE DAÑOS EN EL MOTOR HIDRÁULICO
AVISO Nunca gire el motor sin un eje, ya que la placa podría resultar
dañada.

Copyright © Sandvik 13 (20)

ID: BG00309898 es-ES B.001.1 2017-03-02
Instrucciones de reparación de los motores hidráulicos OMSU, OMT y
MTA

3.4.1 Ensamblaje del motor

4
1

Nota: Con cuidado, empuje la cubierta (2) en su posición. Asegúrese de

que la holgura entre la cubierta y el bastidor es igual en todos los
lados antes de apretar los pernos (1). De lo contrario, el eje (4) podría
quedar detrás de la esquina (3) y el cojinete (5) rompería la cubierta
trasera al apretar los pernos.

14 (20) Copyright © Sandvik

ID: BG00309898 es-ES B.001.1 2017-03-02
Instrucciones de reparación de los motores hidráulicos OMSU, OMT y
MTA

3.4.2 Instalación de los cojinetes

33
34
35
21
35
19

• Instale los cojinetes (35) y el casquillo (21) en el eje (19) como se

muestra en la figura.
• Apriete la tuerca (33) con una herramienta especial (par de apriete: 25
Nm) y doble los bordes de la placa de bloqueo (34) en la parte superior
de la tuerca (33).

Copyright © Sandvik 15 (20)

ID: BG00309898 es-ES B.001.1 2017-03-02
Instrucciones de reparación de los motores hidráulicos OMSU, OMT y
MTA

3.5 Motores hidráulicos OMT

2
2 3

4
5

6
7

* Asegurar con pegamento

** Asegurar con pegamento y localizar clavija
El juego de juntas del motor incluye las piezas 1 a 7. Consulte el manual
de piezas de repuesto.

16 (20) Copyright © Sandvik

ID: BG00309898 es-ES B.001.1 2017-03-02
Instrucciones de reparación de los motores hidráulicos OMSU, OMT y
MTA

3.5.1 Sujeción de la rueda dentada

En los motores hidráulicos OMT se usan dos ruedas dentadas diferentes.
En función del tipo de rueda dentada, se deberán usar casquillos de
sellado (A) de diferente longitud (37 mm o 32 mm).

37 mm
Rueda dentada anterior

AA

Rueda dentada nueva

* Asegurar con pegamento (Loctite 270)

** Asegurar con pegamento y localizar clavija

Copyright © Sandvik 17 (20)

ID: BG00309898 es-ES B.001.1 2017-03-02
Instrucciones de reparación de los motores hidráulicos OMSU, OMT y
MTA

*** Montaje por presión, precalentamiento máx.: 150 °C. Asegurar con
pegamento (Loctite 250)

3.6 Motores hidráulicos MTA

5,8
2
11
10
6
9
3
9
12

13
14

14
15
19
20
7

20

21
22

18

* Asegurar con pegamento

** Asegurar con pegamento y localizar clavija
El juego de juntas del motor incluye las piezas 9, 11, 12 y 19 a 22.
Consulte el manual de piezas de repuesto.

18 (20) Copyright © Sandvik

ID: BG00309898 es-ES B.001.1 2017-03-02
www.sandvik.com
 TARJETA DE MANTENIMIENTO DEL MARTILLO PERFORADOR N.º

Equipo N.º serie

Martillo perforador N.º serie
Horas de percusión desde el último
mantenimiento
Turnos de trabajo
Metros perforados
INFORMACION RELATIVA AL MANTENIMIENTO
Objetivo del mantenimiento Encargado del mantenimiento

Fecha de llegada Mantenimiento Horas de percusión anteriores Horas de trabajo Desm. Insp.
anterior
Fecha de salida N.º de tarjeta de mantenimiento anterior Rep. Mont. Total

PIEZAS REEMPLAZADAS / INSPECCIÓN DE LAS PIEZAS

Cantidad N.º de pieza Descripción Reparado Sustituido OK Observaciones
Pistón
Cilindro delantero
Cojinete delantero
Cilindro trasero
Cojinete trasero
Distribuidor
Acumulador B.P.
Acumulador A.P.
Espaciador
Caja de engranajes
Buje de rotación
Cojinete del buje de rot.
Mandril
Pieza de conexión
Motor de rotación
Eje de rotación
Cojinetes del eje de rot.
Cubierta delant. / cuerpo
Carcasa de la junta de
Cojinetes de la espiga

Mecanismo perc. probado Mecanismo rot. probado

Observaciones

c00640-2es0317