Original instructions

BG00311277 en-US E.001.1 2018-08-28

Hydraulic rock drill HL 710

Operation, maintenance and repair
instructions
Hydraulic rock drill HL 710 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.

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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 Lifting points HL710 ............................................................................. 13
3.2 Lubrication circulation ......................................................................... 16
3.2.1 Lubrication system, underground model ..................................... 18
3.2.2 Lubrcation circulation, surface model ..........................................20

4 Rock drill operation ...................................................... 23

4.1 Bringing the new rock drill into use ....................................................23
4.1.1 Preparations ................................................................................ 23
4.1.2 Fastening to the carriage .............................................................23
4.2 Hose connections .................................................................................24
4.3 Test run ..................................................................................................24
4.4 Flushing .................................................................................................25

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

5.1 Scheduled maintenance .......................................................................27
5.2 Tools ...................................................................................................... 27
5.3 Daily maintenance ................................................................................ 30
5.3.1 Basic maintenance ...................................................................... 30
5.3.2 Maintenance tools and parts ....................................................... 31
5.3.3 Hydraulic rock drill HL 710 .......................................................... 31
5.4 Rock drill maintenance ........................................................................ 33
5.4.1 Before replacing the bushings and bearings ............................... 33
5.4.2 Hydraulic rock drill HL 710 .......................................................... 34
5.5 After rock drill service ..........................................................................45
5.6 Service card .......................................................................................... 45
5.7 Service follow-up .................................................................................. 45
5.8 Rock drill overhaul ............................................................................... 46
5.8.1 Repair facilities ............................................................................ 46
5.8.2 Rock drill overhaul instructions ....................................................47
5.8.3 Disassembly ................................................................................ 49

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Hydraulic rock drill HL 710 Operation, maintenance and repair
instructions

5.8.4 Assembly .....................................................................................70

5.8.5 Wear limits ...................................................................................83
5.8.6 Performing a test run ...................................................................85

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Hydraulic rock drill HL 710 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.

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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).

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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.

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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.

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3 ROCK DRILL MAIN COMPONENTS

3.1 Lifting points HL710
Remove plugs (1) from rear cover and instal lifting eyes (2).

1
2

Weights:
HL 700, HL 710 265 KG
HL 700 S, HL 710 S 265 KG
HL 710 PE (Power Extractor) 320 KG
Tie lifting straps to the rock drill as shown in figures.

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HL 710

HL 710

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

HL 710 PE

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HL 710 PE

3.2 Lubrication circulation

The percussion mechanism and the hydraulic motor of the rock drill are
lubricated using the hydraulic oil that flows through them.
The rotation mechanism and shank are lubricated via oil mist lubrication.
The lubrication line from the central lubrication device is connected to the
fitting (1) in the rock drill spacer (Fig. 2). From there, the oil mist passes to
the front end of the rock drill, where it lubricates the stabiliser pins, rotation
mechanism, chuck, coupling, and flushing housing bearing.
In the underground model (Fig. 3), pressurized air is led into the rear cover
through the connector (BR). The pressurized air pushes the leaked oil, from
the rear section of the piston, back to the gear housing.
In the surface model (Fig. 4), the drain oil from the rear section of the piston
is led to the front through the passage (2).
RISK OF DAMAGING THE ROCK DRILL!
NOTICE Do not let the rear cover make contact with water when the
lubrication blow is not on.

Oil mist that has travelled through the rock drill’s lubrication circulation
system is removed from the rock drill through the flushing housing fitting (5)
(Fig. 2). This used lubrication oil can be conveyed to a container with a
hose.
Note! In no event is oil mist to be conveyed into the hydraulic system
return line.

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The oil consumption should be 400–850 g/h. If necessary, turn the mixture-
adjusting screw or adjust the SLU setting accordingly.

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3.2.1 Lubrication system, underground model

3. Lubrication system; underground model

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4 7
A

6. Shank lubrication (Underground - model)

1 Rock drill 2 Oiler
3 Drain valve 4 Filling cap
5 Connection nipple 6 Sight glass
7 Regulating valve A Air

• The shank lubrication oil consumption should be adjusted to min. 400

grams an hour per drill or more depending on the hole diameter and
other local conditions. Check the function of the shank lubrication by
looking at the sight glass of the oiler and check with hand that the oil is
coming to the shank lubrication nipple.
• If the oil level in the oiler does not lower during drilling, the reason may
be that:
- the regulating valve (7) is blocked up.
- the compressor’s oil separation does not function. The compressor
oil flows with air in to the oiler.
- the oil is too thick for the temperature.
- In each of the above-mentioned cases the fault should be remedied
without delay.
• Drain regularly the water that has collected in the oiler. The draining
interval depends on the local conditions.
• Only the oils mentioned in the oil recommendation are allowed.
• Refill the oiler regularly.
• If compressed air is taken from the mine’s air supply network or the drill
rig’s compressor does not have a water separator, the compressed-air
line should be fitted with such a separator.

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3.2.2 Lubrcation circulation, surface model

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2 1

Shank lubrication (Surface - model)

1 Rock drill 2 SLU 1/2/3
3 Drain valve 4 Filling cap
A Air

1. The oil consumption of the shank lub is adjustable. **

2. If the oil level don’t decrease during drilling. **
3. Drain regularly the water that has collected in the oiler. The draining
interval depends on the local conditions.
4. Only use oil mentioned in the oil recommendation instructions.
5. Refill the SLU 1/2/3 oiler regular
** Please refer to the SLU 1/2/3 instructions

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4 ROCK DRILL OPERATION

4.1 Bringing the new rock drill into use
4.1.1 Preparations
RISK OF DAMAGING THE ROCK DRILL!
NOTICE The new rock drill is supplied with unpressurized accumulators and
plugged hose connections.

1. Follow the instructions when pressurizing the accumulators. Refer to the

manual ‘Pressure accumulator for hydraulic rock drill, maintenance
instructions’.
2. With a new rock drill, a hydraulic check and system flushing must be
performed according to the instructions before the rock drill is installed.
4.1.2 Fastening to the carriage
The rock drill is fastened to the feed carriage with four pairs of bolts. To
avoid damage, it is very important to use the correct tightening sequence.

B A C

First, tighten lightly so that the mating surfaces meet (no clearance
between the carriage and rock drill).
Note! When replacing the bolts, always loosen all the bolts and then re-
tighten using the correct tightening sequence.

1. Pre-tighten bolt set A to 300 Nm (30 kpm).

2. Pre-tighten bolt sets B and C to 300 Nm (30 kpm).
3. Tighten bolt set A to 600 Nm (60 kpm).
4. Tighten bolt sets B and C to 600 Nm (60 kpm).

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4.2 Hose connections

4 6 7 8

1 2

5 3

1 Shank lubrication 2 Percussion mechanism pres-

sure side (H.P.)
3 Percussion mechanism re- 4 Flushing
turn side (L.P.) ( Ø 8 mm)
5 Shank lubrication collector 6 Rotation, case drain line
7 Rotation, return (L.P.) 8 Rotation, pressure (H.P.)

4.3 Test run

Test run the rock drill and make sure that it operates properly before
beginning production drilling.
During the test run, monitor:
• The operation of the shank lubrication.
• The pressures and the temperature.
• The flushing operation.
• Any possible oil leaks.
Note! Avoid using full percussion pressure. When the drill bit is not in
contact with the rock, full percussion pressure strains the
accumulator membranes and causes unnecessary wear of the
flushing housing and cavitation in the percussion mechanism. Such
‘idle drilling’ is especially dangerous when drilling upward and
cleaning holes by pumping.

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4.4 Flushing

5 1

7. Rock drill with water flushing (for underground drilling)

1 Flushing housing
2 Water pressure gauge
3 Pre-controlled flushing valve
4 Drain holes for seal leakage, underground model
5 Drain holes for seal leakage, surface model

Except for the flushing housings, the construction of air and water-flushed
rock drills is identical.
Water is the most common reason for percussion piston seal failures. Water
can enter the rock drill from outside the flushing housing if the rock drill is in
vertical position and shank blow is not on.
Water can also flow with lubricating system air if water is not drained
regularly from the lubrication device.
Water in the front end of the rock drill can cause cavitation pitting in the
body components near the piston seal and wiper ring and in the piston.
Note! To prevent water from entering the gear housing, the flushing
housing seals must be replaced immediately if water is leaking from
the escape holes (4). This is why leaving the rock drill’s front end
pointing upward during pauses in drilling is also prohibited. If this is
not possible, blow the flushing housing dry with air before the break
in drilling.

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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
Sandvik supplies ready tool set for drill repair work. See the tool sets’ spare
part sheet.
Figures 2, 3 and 4 show the tools needed in repairs, the tools being
grouped according to the work phases.

2. Tools for the rock drill disassembly and assembly

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3. Tools used with the hydraulic press

4. Tools for the disassembly, assembly and testing of the pressure

accumulator

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5. Special tools

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5.3 Daily maintenance

5.3.1 Basic maintenance
Check the percussion hour meter reading. Sandvik recommends that the
rock drill is disassembled every 500 percussion hours (refer to the repair
instructions, ‘Disassembly’ section). Fill in the maintenance card.

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5.3.2 Maintenance tools and parts

Ensure that the operator keeps the tools and parts required for
maintenance with the drilling rig.
The rock drill toolkit includes a torque wrench and sockets. A socket and
extension are required for tightening the rock drill/carriage’s front and rear
end mounting bolts.

The drilling rig should also carry a spare flushing housing seals, shank, and
coupling for maintenance.
5.3.3 Hydraulic rock drill HL 710

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.

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Checking the flushing housing seals

The seals are the most sensitive and important components of a rock drill.
When disassembling a rock dill, always replace all seals and O-rings.
Check the flushing housing seals during drilling. The seals must be
replaced if flushing water is leaking out from the drain holes.

90º 4 4 A

1 2 3

1 2 3
B

Installation directions for the seals and bearing bushing

1 Drain holes

Install the seals (1, 2, and 3) using either option A (water flushing and
water mist flushing) or option B (air flushing).
Replace the flushing housing seals and install the bearing bushing (1) in
the correct position on the front cover, as shown in figure.

Checking the tightness of the flushing housing bolts

1. Check the tightness of the flushing housing bolts. Use a torque wrench
and a 36 mm socket.
The correct tightening torque is 600 Nm (60 kpm).

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.

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Checking the tightness of the rock drill mounting bolts

1. Check the tightness of the rock drill mounting bolts.
2. Tighten the loosened mounting bolts.
If the rock drill mounting bolts are loosened, check also the tightness of
the side bolts.

5.4 Rock drill 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.

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5.4.2 Hydraulic rock drill HL 710

Inspection and maintenance of the front end with the rock drill on the carriage
WARNING! CRUSHING HAZARD!
Falling rock drill components could cause death or severe injury.
In order to replace the shank, the rock drill has to be tilted as much
as possible in a horizontal position. This way you eliminate that the
rotation bushing and coupling won’t drop.

WARNING! HIGH PRESSURE AND FLYING MATERIAL HAZARD!

Unexpected movement of the rock drill components could cause
death or sever injury.
If the lubrication clogges up, (no air coming from the shank
lubrication) turn off the motor, slowly let the pressurized air escape
via the locking bolt before loosening the bolts of the flushing
housing. Otherwise the flushing housing can burst out due to the
pressure.

You can also detach the flushing housing without having to remove the rock
drill from the carriage by opening the bolts (1) and the nuts. The coupling
and the shank will also detach, as well as the rotation bushing and the
chuck opening the lock bolt (2).Always check these items when
replacing the shank.

8. Dismantle of flushing housing

Note! Always check the condition of the rotation bushing and the chuck
when replacing the shank.

Use the shank when removing the lock washers (1). Remove the cover (3)
and the connector flange (2) before removing the seal housing.

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3 2

9. Dismantle of tube-version flushing housing

Changing the bearing of the flushing housing

The bearing must be replaced when the wear indicator groove has worn as
shown in the figure. Open the front cover and remove the bearing with a
hydraulic press and the punches included in the toolkit.

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Assembling the flushing housing

Note! Lubricate the O-rings with petroleum jelly before assembly.

Align the holes in the flushing housing and seal housing and press the seal
housing in. Reinstall the fitting flange and front cover. Check the seals.
Tube flushing housing
Reinstall the shank and locking washer pair in the flushing housing. Turn
the shank to a vertical position and strike the retainer ring pair with the
shank.
B
90º
A

Installing the tube flushing housing retainer ring pair

Coupling

Pull the coupling out from the rotation bushing. Check it and replace if the
edges of the inner teeth are worn to a point.
Note! The length of the coupling in the HL 800 T rock drill is 82.5 mm (from
the serial number 305 onwards); the spare part number as the same
as in the HL 700 rock drill (the length of the previous model was 84.5
mm).

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Rotation bushing

Check the wear of the rotation bushing teeth, bearing surfaces, and bearing

The bearing must be replaced when the wear indicator groove has worn off.
The bearing is replaced with a hydraulic press and the punches included in
the toolkit - refer to the repair instructions.

Chuck

The chuck must be replaced if the surface indicated in the figure has worn
over 1 mm or the chuck has cracks in it.
Note! When installing the chuck, ensure that it faces the right direction.

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Front bearing of gear housing

The bearing must be changed if the wear indicating grooves have worn out
as shown in the picture. Remove the bearing by using punch and hydraulic
press.

Chuck and lock ring pair

The shank bushing and lock ring pair must be replaced if the surface
indicated in the figure has worn over 1 mm.

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Wear limits of the shank

1 1

1 Max. 1 mm
B Manufacturing: 2 mm, reject limit: 1 mm
The shank must be replaced when 1 mm of the 2 mm bevel at its rear has
worn off or any other wear limit is exceeded.

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Checking the tightness of the bolts and tightening torques

Checking the tightness of the bolts, especially the side bolts, is probably the
most important maintenance procedure for a rock drill. Loose side bolts
cause rapid wear of the rock drill frame’s mating surfaces, shortening the
service life of the rock drill.
The bolts cannot be tightened to the correct tightening torque if the threads
are not clean. Therefore, clean and check the threads if necessary,
lubricating them with grease.
Checking the bolts during regular maintenance:
• 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 opened and re-tightened according to the tightening
instructions.
Note! Use only a calibrated, high-quality torque wrench.

5 6
4 7
3
2
1

6
8

1 Front cover bolts, 200 Nm 2 Fitting flange bolts, 200 Nm

3 Flushing housing bolts, 600 4 Intermediate gear pin bolts,
Nm 200 Nm
5 Hydraulic motor bolts, 150 6 Pressure accumulator bolts,
Nm 200 Nm
7 Rear cover bolts, 400 Nm 8 Side bolts, 400 Nm

Note! For the bolts equipped with a locking washers, a new locking washer
pair must be used after each time the bolt is opened.

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Side bolts
Required tools:
• Torque wrench
• Socket 24 mm

2
1

1. Lubricate the threads and nut faces with petroleum jelly.

2. Lightly turn the rearmost nuts (1) fully home.
3. Pre-tighten the frontmost nuts (2) to 200 Nm (20 kpm). Use the tightening
sequence A → B → C → D.
4. The final tightening torque is 400 Nm (40 kpm). Use the same tightening
sequence (A → B → C → D).

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Pressure accumulator bolts

Required tools:
• Torque wrench
• Socket 24 mm

C
B

1. Lubricate the bolts with petroleum jelly.

2. Pre-tighten all four bolts to 100 Nm (10 kpm) with a torque wrench. Use
the tightening sequence A → B → C → D.
3. The final tightening torque is 200 Nm (20 kpm). Use the same tightening
sequence (A → B → C → D).

Intermediate gear pin bolts

Required tools:
• Torque wrench
• Socket 24 mm

1. Lubricate the bolts (1) with petroleum jelly.

2. Install the washers and bolts.
3. Pre-tighten the bolts to 100 Nm (10 kpm).
4. The final tightening torque is 200 Nm (20 kpm).

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Installing the rotation motor

1 2

Note! Remove the flushing housing (1) and the rotation bushing (2) before
installing the motor.

Rotation motor bolts

Required tools:
• Torque wrench
• Socket 24 mm

C
B

A D

1. Lubricate the bolts with petroleum jelly.

2. Pre-tighten all four bolts to 100 Nm (10 kpm) with a torque wrench. Use
the tightening sequence A → B → C → D.
3. The final tightening torque is 150 Nm (15 kpm). Use the same tightening
sequence (A → B → C → D).

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Flushing housing bolts

Required tools:
• Torque wrench
• Socket 36 mm

C
A

1. Lubricate the bolts and nuts with petroleum jelly.

2. Pre-tighten all four bolts (1) to 300 Nm (30 kpm) with a torque wrench.
Use the tightening sequence A → B → C → D.
3. The final tightening torque is 600 Nm (60 kpm). Use the same tightening
sequence (A → B → C → D).

30º

Alternative tightening procedure for the flushing housing bolts: Pre-tighten

to 200 Nm (20 kpm) and then 30º. Use the tightening sequence
A → B → C → D.

Checking the condition of the pressure accumulators

1. Visually check the condition of the pressure accumulators.
2. Check the filling valves and the cover plugs.
3. Service or replace the damaged accumulator.

Checking the pressure accumulator pressures

1. Check the pressures of the pressure accumulators.
Refer to the pressure accumulator maintenance instructions.

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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.

5.5 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.
This is why the side bolts and mounting bolts must be re-tightened
after drilling about 100–200 metres following maintenance.

5.6 Service card

The card is machine-specific. 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.
When a rock drill enters use again after maintenance, the date for the next
servicing is marked on the card.
The maintenance card reveals 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 enables us to view the entire maintenance
history of a rock drill.
• The card simplifies the decision to scrap an old machine.

5.7 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.

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• The card simplifies the decision to scrap an old machine.

5.8 Rock drill overhaul

5.8.1 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

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5.8.2 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.

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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.

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5.8.3 Disassembly
The Rock drill has to be disassembled and the components to be checked
after every 500 drilling hours.
Disassembly and assembly of the rock drill requires from the performer
professional skill and practical knowledge of these machines. The working
room should be dry, dustless and clean.
There should also be a wash-basin and compressed air available for the
cleaning of the drill components.
Before the disassembly the drill should be washed on the outside for
example with a high-pressure water spray. In addition to this we
recommend that the drill is washed on the outside also with a brush and
suitable solvent before it is taken to the actual servicing place. A split barrel
suits this purpose well.

1
2

11. Assembly stand

Required tools:
• Spanner 30 mm, 36 mm and 41 mm
Note! Fit and secure the locking latch (1) with bolts (3). Mount the drill to
the assembly stand with front and rear bolts (2).

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Hydraulic rock drill

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Disassembling the front end

1. Tie the lifting strap to the flushing housing and lifting hook.
2. Tighten the lifting strap.
3. Open the flushing housing bolts.
4. Pull the flushing housing out.
5. Open the lock bolt (1).
This allows you to remove the coupling and the rotation bushing.

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Removing of the pressure accumulators

WARNING
HIGH PRESSURE AND FLYING MATERIAL HAZARD!
Using false working methods may cause high pressure gas
discharge and flying material, which could cause death or severe
injury.
Do not use any other methods, than described in the manual
'Pressure accumulator for hydraulic rock drill, maintenance
instructions', to depressurize or disassemble an accumulator.

Note! Fit protective plugs immediately into the openings on the body
cylinder.

Note! Refer to the manual 'Pressure accumulator for hydraulic rock drill,
maintenance instructions'.

Required tools:
• Torque wrench
• Socket 24 mm

1. Release the accumulator pressure by opening the filling valve.

2. Open the accumulator bolts.
3. Detach the accumulator and remove the seal.

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Rotation motor

Required tool:
• Spanner
Remove the rotation motor mounting bolts and pull the motor assembly out
from the gear housing. Remove the O-ring. Open the cover bolts. Pull the
rotation shaft out from the bearing housing with the puller (092 864 58) and
punch (088 277 08).

7 14 3 2
4
10

10
5
9
8 5
13

12
6

11

1 Bearing housing 2 Lock nut

3 Lock washer 4 Spherical roller bearing
5 Circlip 6 Cover
7 Bolt 8 Rotation shaft
9 Thrust plate 10 Shaft seal
11 O-ring 12 O-ring
13 Inner ring of cylindrical roller 14 Lock washer
bearing

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15

3 1
4
10 7 12 5 2

Note! To avoid damaging the seals, use the mounting punch (1) included in
the toolkit when pushing the rotation shaft into the cover.

1. Install the inner ring of the bearing (15) on the shaft (10).
2. Install the cover seals (12) with the punch (152 537 28), and install the
circlips.
3. Attach the cover (7) with the seals to the shaft with the punch (1).
4. Install the bearing (5) on the shaft (10), tighten the nut (3) (200 Nm) and
secure with the tabs of the locking plate (4) and adhesive.
5. Install the shaft assembly into the bearing housing (2).
6. Tighten the cover bolts (8).
Use the cross-tightening method.

• Pre-tightening torque: 10 Nm
• Final tightening torque: 32 Nm
Note! Remember to use the lock washers and threadlocker!

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Turning to vertical position

1. Install a lifting lug (1) to one of the threaded holes in the gear housing.
2. Tie a lifting strap to the lifting lug and to the lifting hook, and tighten the
strap.
3. Open the latch (2).
4. Turn the assembly stand to vertical position.

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Removal of the percussion mechanism

19. Removing the rear cover and piston assembly

Removing the rear cover

Required tool:
• Spanner 30 mm

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Open the latch and bolts (2 pcs) from the rear of the mounting plate. Using
a hoist, lower the rock drill to a vertical position. Remove the bolts and lift
the rear cover off (see figure). Remove the O-ring also. Check the wear of
the rear cover and body cylinder end.
Removing the percussion mechanism
Required tool:
• Lifting eye
Thread the puller into the piston (see figure). Lift the piston out from the
cylinder. This will also extract the rear cylinder, rear bearing, and distributor.

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Percussion mechanism

Disassemble the piston assembly by removing the rear cylinder and

distributor from the top of the piston and the rear bearing from the rear
cylinder.

Check the piston:

The piston needs to be replaced, if:
• The bevel at the percussion end has worn off
• The piston has cracks or seizure marks in it
If necessary, the piston may be polished with a cloth wheel. Never grind
the piston!

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.
Note! Never grind the distributor.

Check the rear cylinder:

• If the rear cylinder has scratches, remove them by polishing with a cloth
wheel.
• Install new O-rings.
• Replace the part if the sliding surface has scratches that can be felt with
a finger.
Note! Never grind the rear cylinder.

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Body cylinder

1. Remove the body cylinder’s rear mounting bolts.

2. Lift the body cylinder off.
3. Use lifting eyes and hoist during lifting.
4. Remove the front cylinder.
5. Check the wear of the end faces.

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Removing the front cylinder bearing

The front cylinder bearing bushing is removed and replaced only if it

is damaged.
Using the screw, press the special tool (1) pins in and fit them from the front
into the notches behind the front cylinder bearing (2).
Press the bearing out with the punch (3) and suitable sleeve (4).

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Removing spacer
1. Remove spacer

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Disassembling and assembling the spacer bearing and seal housing

• Detach the spacer from the gear housing and check the bearing surface
for wearing.
• Replace the spacer if the indication grooves (A) have worn out.

1 A

1 Disassembly
2 Auxiliary punch 550 055 27
3 Punch for removing 550 342 21
• Cool the bearing to -20°C before installation.

2 B C

2 Assembly
B Groove
C Spacer marking
• Align the long groove (B) of the bearing with the spacer marking (C).
• Pay attention to the locking surface.

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• The seal housing must be replaced if the seal groove in the spacer is
wider than 4,35 mm.
Use the tool 150 746 48 to check the width.

1 4 2 6 5

3 A B

1 Disassembly 2 Assembly
3 Locking rings 550 055 28 4 Punch for removing 550 055
27
5 O-ring
• Use the proper punch for assembling the seal housing.
• Install to the level of the spacer surface.
• Align the groove (B) of the seal housing with the groove (A) of the spacer.
Note! Clean the spacer and the seal bushing carefully before installation.

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Disassembling and assembling the gear housing

Removing the intermediate gear

Check the gear housing wear limits (refer to the section ‘Wear limits’).

Required tools:
• Spanner, 24 mm
• Puller
Remove the bolts, and remove the shaft journal with a puller. Let the
intermediate gear drop down, and remove the support plates. Check the
wear of the support plates and shaft surface. Replace the parts, if
necessary.

Replacing the intermediate gear needle bearings

Required tools:
• Punch
• Suitable sleeve
The needle bearings must be replaced every 500 percussion hours.
Using a hydraulic press, press the needle bearing out from the intermediate
gear with a punch and a suitable sleeve. If the surface of the intermediate
gear teeth is damaged, replace the gear.

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Installing the needle bearing

Press the first needle bearing into the intermediate gear, using a hydraulic
press. Turn the gear the other way round, and press the other needle
bearing in.
Note! Ensure that the hard ends of the needle bearings (the sides with text)
are on the outside of the gear faces.

1 7
10
5
9
2

9
10 12

11
9
12

8
3

1 Housing 2 Rear bushing

3 Front bushing 4 Bushing
5 Cylindrical roller bearing with- 7 Seal
out inner ring
8 O-ring 9 Bonded seal
10 Plug 11 Retaining screw
12 Socket

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Intermediate gear shaft bushings

Check the wear of the bushings, and replace them if necessary. The first
bushing is removed by applying a punch inward. The bottom bushing is
removed with a special tool and puller (see figure). The bushings are
installed with a punch.

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Gear housing front bearing

1. Install two lifting lugs to the upper mounting bolt holes.

2. Tie a lifting strap to the lifting lugs and lifting hook.

3. Lift the gear housing to a hydraulic press.

The bearing must be replaced when the patterns are worn out (as shown in
the figure). Use suitable mounting punches and a hydraulic press.

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Removing the front bearing

Note! Be careful not to scratch the inner surface of the gear housing when
removing the bearing.

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The gear housing rear bearing

1. Install two lifting lugs and bolts to the upper mounting bolt holes.

2. Tie a lifting strap to the lifting lugs and lifting hook.

3. Lift the gear housing to a hydraulic press.

The bearings must be replaced if the wear indication groove has worn out
as shown in the picture. Use a suitable punch and a hydraulic press.

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Cylindrical roller bearing

Install the bearing with a plastic hammer and a punch. Check that the roller
cage rivets are pointing toward the rear of the rock drill. The inner ring of
the bearing is installed with the rotation motor shaft.
The bearing must be replaced every 500 percussion hours.
5.8.4 Assembly
Work especially carefully when assembling the rock drill. Check that all
parts are completely clean.
Before assembling the rock drill, check all parts subject to wear, such as
bearings and pressure accumulator diaphragms (refer to the section
‘Pressure accumulators’), and replace if necessary. The wear limits for all
parts are shown in the wear limit table (refer to Section 7). The parts must
be lubricated - with, e.g., motor oil - before assembly.
Note! All mating surfaces must be completely dry and clean.

Assembly stand
When assembly of the rock drill commences, the mounting plate of the
assembly stand is in a horizontal position. Ensure that themounting bolts (2
pcs) and the latch are closed.
Attach the gear housing to the assembly stand. Tighten the bolts.

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Installing the intermediate gear

Required tools:
• Torque wrench
• Socket 24 mm

1. Install the support plates and intermediate gear wheel into the gear
housing.
2. The shaft journal must go up to the O-ring when pushed by hand.
3. Drive the shaft carefully into place with a rubber mallet.
4. Ensure that the support plates stay in place during assembly.
5. Tighten the bolts (A) to 200 Nm (20 kpm).
Use new locking washer pairs.

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Installing the spacer

• Install the spacer assembly into the gear housing.

Note! Use grease for the support plate to help the assembly.

Note! Make sure that the seals of the spacer and the gear housing are in
correct places.

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Installing the body cylinder

1. Lower the body cylinder carefully. Use lifting lugs and a hoist.
2. Attach the rear mount of the body cylinder loosely to the assembly stand.

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Installing and tightening the side bolts

Turn the mounting plate to a horizontal position with a hoist. Secure with
the latch and bolts (2 pcs) at the rear of the locking plate.
Required tools:
• Torque wrench
• Socket 24 mm

2
1

1. Lubricate the threads and nut faces with grease.

2. Lightly turn the rearmost nuts (1) fully home.
3. Pre-tighten the frontmost nuts (2) to 200 Nm (20 kpm). Use the tightening
sequence A → B → C → D.
4. Tighten the rear mount of the body cylinder against the mounting plate.
5. The final tightening torque is 400 Nm (40 kpm). Use the same tightening
sequence (A → B → C → D).

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Percussion mechanism
Note! Apply plenty of oil to the inner surface of the body cylinder.

Note! Refer to the section ‘Seals’, and make sure that all seals are correctly
installed. Check also that the components are installed facing the
right direction.

Lower the assembly stand to a vertical position with a hoist. Attach the front
cylinder to the body cylinder. Install the rear bearing in the rear cylinder so
that the surfaces are level. Install the distributor and the rear cylinder with
its rear bearing on the piston journal.
Lift the piston assembly into the body cylinder. Use the same special tool
used for lifting the percussion cartridge.

51. Percussion cartridge

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Rear cover
Required tools:
• Torque wrench
• Socket 30 mm
Install the rear cover and bolts on the body cylinder. Place the O-ring in the
rear cover groove prior to installation. Use new locking washer pairs. The
surfaces must be dry and clean.

1. Pre-tightening torque: 200 Nm (20 kpm)

Use the cross-tightening method.

2. Final tightening torque: 400Nm (40 kpm)

Use the cross-tightening method.

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Installing the hydraulic motor

Install the hydraulic motor carefully in the gear housing and tighten the
bolts.
Required tools:
• Torque wrench
• Socket 24 mm

A 1
2

Figure 53. Tightening the hydraulic motor bolts

Lubricate the threads with grease. Pre-tighten all four bolts to 100 Nm (10
kpm) with a torque wrench. Use the tightening sequence 1-2-3-4. Tighten to
150 Nm (15 kpm). Tighten in a crosswise pattern (1-2-3-4).

Note! Apply grease to the hydraulic motor O-ring and hub.

Note! All mating surfaces must be absolutely dry and clean.

Note! Always install the motor before the rotation bushing and flushing
housing.

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Installing the pressure accumulators

Refer to the manual ‘Pressure accumulator for hydraulic rock drill,
maintenance instructions’.
Required tools:
• Torque wrench
• Socket 24 mm

C B

D
A

1. Lubricate the O-rings and bolts.

2. Drive the accumulators into place with a rubber mallet.
3. Pre-tighten all four bolts to 100 Nm (10 kpm) with a torque wrench.
Use the tightening sequence A → B → C → D.
4. The final tightening torque is 200 Nm (20 kpm).
Use the tightening sequence A → B → C → D.

The types and pressures of the accumulators

Type of accumulator Pressure [bar]

High pressure 50
Low pressure 4

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Turning into horizontal position

1. Install the lifting lug (1) and bolt to one of the threaded holes in the gear
housing.
2. Tie lifting strap to the lifting lug and lifting hook.
3. Tighten the strap.
4. Lift the assembly stand to horizontal position.
5. Lock the latch (2).

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Assembling the front end

1. Install the flushing housing assembly.

Use new gasket (1).
Refer to the section 'Rock drill maintenance'.

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Installing the clamp screw

Required tools:
• Torque wrench
• Socket 19 mm

1. Turn the mounting plate to a horizontal position with a hoist.

2. Secure the mounting plate with the latch and bolts.
3. Lubricate the clamp screw threads.
4. Install a new bonded seal.
5. Tighten the screw to 120 Nm (12 kpm).

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Hydraulic rock drill HL 710 Operation, maintenance and repair
instructions

Tightening the flushing housing bolts

Required tools:
• Torque wrench
• Socket 36 mm
• Spanner 36 mm

B
C

D
A

1. Lubricate the bolt threads.

2. Use new locking washers.
3. Pre-tighten the bolts to 300 Nm (30 kpm).
Use the tightening sequence A → B → C → D.
4. Tighten the bolts to 600 Nm (60 kpm).
Use the tightening sequence A → B → C → D.

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.

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5.8.5 Wear limits

H
G

K E

D
C
B

F
L

40. Wear limits

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instructions

PART NAME WEAR LIMIT

Must be changed, if the oil groove is worn flush with the
A Bearings of the shank
bearing surface in any place.
B Gear housing Manufacturing 271 mm / Reject 270 mm
Front bearing of the gear Must be changed if the ”oil pockets” are worn out on some
C
housing places on the bearing surface.
Rear bearing of the gear Must be changed if the oil groove is worn out on some pla-
D
housing ces on the bearing surface.
Must be changed if the shaft/bushing is worn loose or the
E The shaft of the idler gear
surface of the shaft is damaged.
F Piston Must be changed if the bevel of the piston head is worn out.
Must be changed if the pair depression is 1 mm / if there
G Chuck / Lock ring pairt
are cracks on the surface.
H Coupling Must be changed when the teeth are worn halfway.
K Shank See Operation and Maintenance.
The bearing must be replaced when the wear indicator
L Spacer bearing groove has worn down to the level of the surface at any
point.
Change the seal housing if the width of the seal groove is
M Seal housing of the spacer
more than 4,35 mm.
Check the wearness of the bearing surfaces and the rota-
N Rotation bushing
tion bushing teeth.

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Hydraulic rock drill HL 710 Operation, maintenance and repair
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Percussion cartridge fitting between the spacer and rear cover

B
A

2
1

Wash the percussion cartridge (1) components. Before assembly and

measurement, check that the components are clean and that no oil film is
present.
Measure dimensions (A), (B), and (C). The difference between values (A)
and (B) must be greater than value (C). If this is not the case, reject parts
(3) and (4).
5.8.6 Performing a test run
Test run the rock drill and make sure that it operates properly.
During the test run, monitor:
• The mating surfaces of the components and the front end of the rock drill
for oil leaks
• The operation of the shank lubrication
• The flushing operation
• The pressures and the temperature

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instructions

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 Original instructions
en-US 7 2020-06-04

Pressure accumulator for hydraulic

rock drill, maintenance instructions

GUID-551C629E-D633-4F88-A638-694FB31ACCDB
Pressure accumulator for hydraulic rock drill,
maintenance 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.

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Pressure accumulator for hydraulic rock drill,
maintenance instructions

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Pressure accumulator for hydraulic rock drill,
maintenance 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

3 Accumulator maintenance and repair.......................... 11

3.1 Pressure accumulators.............................................................................11
3.2 Pressure gauges....................................................................................... 12
3.3 Checking the charge gas pressure of a pressure accumulator........... 13
3.4 Removing the pressure accumulators....................................................14
3.5 Disassembling the pressure accumulator..............................................15
3.6 Checking the pressure accumulator....................................................... 17
3.7 Assembling the accumulator................................................................... 18
3.8 Filling the accumulators...........................................................................22
3.8.1 Filling instruction..............................................................................22
3.8.2 Filling pressures of accumulators....................................................24
3.9 Mounting the pressure accumulator on the rock drill........................... 27

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Pressure accumulator for hydraulic rock drill,
maintenance instructions

1 INTRODUCTION
1.1 The purpose of these instructions
This manual contains supplementary information for operation,
maintenance and repair of a component.
These instructions must be followed along with other manuals of the rig,
any instructions given in local laws and regulations, any orders given by
local authorities, and all protective measures specific for the site.
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 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.

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maintenance instructions

2 SAFETY AND ENVIRONMENTAL INSTRUCTIONS

2.1 Safety precautions
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.

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maintenance instructions

3 ACCUMULATOR MAINTENANCE AND REPAIR

3.1 Pressure accumulators

WARNING
RISK OF EXPLOSION!
A pressure accumulator repaired in a faulty manner can explode and
could cause death or severe injury.
Repairing a pressure accumulator by welding or in any other faulty
manner is strictly prohibited. Replace a faulty pressure accumulator
with a new one.

WARNING
HIGH PRESSURE HAZARD!
A high pressure gas discharge could cause death or severe injury.
Before removing the pressure accumulator from the rock drill,
release the pressure by opening the filling valve.
Before pressurizing the pressure accumulator, install it to the rock
drill. Do not pressurize a pressure accumulator if it is not installed to
a rock drill.
When a pressure gauge is used, the discharge opening must be
directed to an unrestricted space to prevent a risk to those in the
immediate vicinity as a result of the pressure discharge.

In all hydraulic systems, cleanliness is the single most important factor in

ensuring trouble-free operation. For this reason, the pressure accumulators
must be filled and serviced in a clean and dust-free environment.
The condition of a pressure accumulator must be checked whenever the
accumulator is being disassembled and the rock drill is being serviced. The
rock drill's special toolkit contains all the tools required for servicing and
checking the pressure accumulators.
Experience has shown that the first (originally fitted) pressure accumulator
diaphragm will not achieve the normal service life, especially if the time
between pressurization and commissioning is long. This is why the
pressure accumulators supplied as spare parts are unpressurized and this
is also indicated on the accumulator.
Tho bottom and cover of a pressure accumulator must remain as a pair. All
accumulator covers and bottoms supplied by Sandvik are paired. Other
parts, such as diaphragms and filling valves, are supplied separately.

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3.2 Pressure gauges

WARNING
HIGH PRESSURE HAZARD!
Flying shrapnels could cause severe injury.
Use only gauges meant for gas pressure measurement when
checking or pressurizing accumulators. The glass of a liquid damped
gauge may break under pressure and fly off at high speed.

A gauge meant for gas pressure measurement

An over-pressure breaking point of a gas pressure gauge

If the pressure inside the gas pressure gauge rises too high (for the result
of a broken tube inside the gauge), the gauge's back side (A) breaks open
and relieves the pressure.
The gauge must be replaced if the gauge's back side is broken.

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maintenance instructions

3.3 Checking the charge gas pressure of a pressure accumulator

The charge gas pressure of a pressure accumulator must be checked
every 50 hours or earlier if necessary.
The check is performed by using a pressure gauge included in the rock
drill's special toolkit. The pressure gauge's range is from 0 to 100 bar for
the high-pressure accumulators, and from 0 to 10 bar for the low-pressure
accumulators.

4
3
2
1

4
3 5
2

1. Remove the rubber protection cap (1)(optional) or the metal cap (2).
2. Screw the pressure gauge to the filling valve (4).
3. Open the locking nut (3).
4. Wait until the gauge pointer stops moving and then check the reading.
If the reading is low, refer to Filling instruction (Page 22) on how refill
the accumulator.
5. Close the locking nut (3).
By using a torque wrench, tighten the locking nut to 15 Nm.
6. Disconnect the gauge from the filling valve (4).
7. Install the rubber protection cap (1)(optional) or the metal cap (2) back
to its place.
Some accumulator types have two similar channels leading into the
pressure chamber. The channel ports have either a filling valve (4) or a plug
(5) installed. The positions of the filling valve (4) and the plug (5) are
interchangeable.
The correct tightening torque for the filling valves (4) and plugs (5) is 40
Nm.

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maintenance instructions

3.4 Removing the pressure accumulators

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

Before removing the pressure accumulators from the rock drill, release the
accumulators’ pressure by opening the filling valves. No one is allowed in
front of the valve when it is being opened.

1. Open the filling valves.

2. Remove the accumulator mounting bolts.
3. Detach the accumulators.
4. Remove the O-rings.
5. Remove the gasket plates.
6. Insert protective plugs into the rock drill openings.

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3.5 Disassembling the pressure accumulator

DANGER
RISK OF EXPLOSION!
An exploding pressure accumulator will cause death or severe injury.
Never heat an accumulator to temperatures over 100°C.

WARNING
HIGH PRESSURE AND FLYING MATERIAL HAZARD!
Disassembling a pressurized accumulator will cause high pressure
gas discharge and flying material, which could cause death or
severe injury.
Do not disassemble a pressurized accumulator.
If an accumulator can not be depressurized, it must be disposed of
properly.
Do not try to depressurize an accumulator using false methods, e.g.
drilling a hole through the diaphragm.

WARNING
HIGH PRESSURE AND FLYING MATERIAL HAZARD!
Using false working methods may cause high pressure gas
discharge and flying material, which could cause death or severe
injury.
Do not use any other methods, than described in this manual, to
depressurize or disassemble an accumulator.
Do not drill a hole through the diaphragm or any other part of an
accumulator.

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maintenance instructions

1. Fasten the bracket (1) to a vice.

2. Place the accumulator on the bracket, with the bottom pointing upward.
Make sure that the filling valve is not pointing towards you or any other
person.
3. Ensure that the filling valve is open!
4. When disassembling a stem-type accumulator, ensure that there is no
pressure inside of the accumulator by pressing the stem. The stem
should move inward freely.

If the stem does not move, do not open the accumulator.

5. Open the accumulator bottom with the special tool (2).
The cover and bottom of a pressure accumulator are marked with the
same number, and they must be retained as a pair.

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3.6 Checking the pressure accumulator

WARNING
HIGH PRESSURE AND EXPLOSION HAZARD!
The breakage of a worn-out or damaged pressure accumulator could
cause death or severe injury.
Damaged pressure accumulators must be scrapped.
If the threads of the pressure accumulator are corroded, it must be
scrapped.

1. Carefully clean and check the threading.

2. Visually check the inside and outside of the accumulator for wear,
damage, and corrosion.
3. If necessary, use fluid penetrant testing to check the accumulator for
damage.

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3.7 Assembling the accumulator

WARNING
HIGH PRESSURE AND EXPLOSION HAZARD!
A breakage of a worn-out or damaged pressure accumulator could
cause death or severe injury.
A worn-out or damaged pressure accumulator must be discarded
immediately.

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maintenance instructions

1 2

1. Check the number on the cover and the bottom.

Note! The number on the cover and the bottom must be same.
The high pressure accumulators are marked with uneven numbers and
the low pressure accumulators with even numbers.

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2. Fit a new or inspected diaphragm to the cover.

Make sure that the diaphragm is in the groove and fitted so that the
correct side is downwards.
When the pressure accumulator diaphragm is changed, the O-rings
should also be changed.

3. Lubricate the surface of the diaphragm (a) and the bottom surface of the
accumulator (b) with vaseline or lanolin.
4. Lubricate the thread of the bottom with vaseline or lanolin.
5. By using a torque wrench and the special tool, tighten the bottom to 150
Nm (15 kpm).
6. Replace the filling valve.

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Always check the wear limit marks of the thread after tightening the bottom.
if the mark (I) on the bottom remains between the dot (•) and the mark (R)
on the cover, the thread is in order.
If the mark (I) on the bottom goes beyond the mark (R), the threads of the
accumulator cover and bottom are too worn. Replace the accumulator and
discard the old one.
If the accumulator can not hold the charge gas after changing the
diaphragm and filling valve, check the threading, bottom, and body of the
accumulator carefully with, for example, a fluid penetrant test.

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3.8 Filling the accumulators

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

WARNING
HIGH PRESSURE HAZARD!
Breakage of the accumulator when filling a damaged or worn
accumulator could cause death or severe injury.
Do not fill an unchecked or too worn accumulator.

WARNING
EXPLOSION HAZARD!
An accumulator filled with wrong type of gas could explode and
cause death or severe injury.
Use only nitrogen (N2) to fill a pressure accumulator.

3.8.1 Filling instruction

12 9 8 7 6 5 3 2

11 10 13,14 15 4 1

1 Accumulator body 2 Filling valve

3 Locking nut 4 Cap
5 Quick coupling stem 6 Quick coupling sleeve

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7 Hose 8 Accumulator pressure

gauge
9 Gas bottle pressure gauge 10 Pressure reducing valve
11 Pressure regulating valve 12 Shut-off valve
13 Adapter 14 Seal
15 Elbow adapter

1. Remove the cap (4).

2. Screw the elbow adapter (15) to the filling valve (2).
3. Push the quick coupling sleeve (6) onto the stem (5).
4. Undo the locking nut (3).
5. Turn the pressure regulating valve (11) open.
6. Open the nitrogen bottle valve (12).
The gauge (9) indicates the pressure in the bottle.
7. Adjust the pressure in the low pressure accumulator to 5 - 10 bar by
turning the regulating valve (11).
Gauge (8) indicates the pressure in the accumulator. Adjust the
pressure according to step 15.
8. Adjust the pressure in the H.P. accumulator with the pressure control
valve (11), according to the instructions.
Gauge (8) indicates the pressure in the accumulator. Max. pressure is
marked on the accumulator.
9. Adjust the pressure of the stabilizer accumulator with the pressure
control valve, according to the instructions.
Gauge (8) indicates the pressure in the accumulator.
10. Close the filling valve (2) by turning the locking nut (3).
11. Close the nitrogen bottle valve (12).
12. Turn the pressure regulating valve (11) open.
13. Disconnect the quick couplings (5) and (6).
14. Release the elbow adapter (15) from the filling valve (2).
15. Mount the checking gauge (0-10 bar) in to the low pressure accumulator
filling valve (2) and by opening the locking nut (3) let the pressure flow
out until the gauge shows 3 - 5 bar.
16. Tighten the locking nut (3) to 15 Nm (1.5 kpm).
17. Refit the cap (4).

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3.8.2 Filling pressures of accumulators

Low pressure accumulator (LP)

RISK OF DAMAGING THE ROCK DRILL!

Overfilling a low pressure accumulator significantly increases the
NOTICE risk of cavitation.
Make sure that the accumulators are filled to the specified pressures.

A low pressure accumulator damps the hydraulic vibrations in the return

line. It also prevents cavitation in the return lines and channels.
To get the optimum performance from a low pressure accumulator, the gas
pressure of the accumulator should be half of the return line pressure.
Normally a low pressure accumulator is pressurized to 2 - 4 bars.

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High pressure accumulator (HP)

The main function of high pressure accumulator is to store pressurized oil
during the return stroke of the piston. This stored pressure can be utilized
during the next piston stroke.
Another vital function is to dampen vibrations.
HP-accumulator's gas pressure must be relative to the set maximum
percussion pressure according to the following graph.

Stem-type diaphragm

1 Upper limit A Filling pressure

2 Lower limit B Percussion pressure

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100

90

80 3

70

60 1

50 4

40

30 2

20

10

A 0
bar 100 120 140 160 180 200 220 240 260 280
B

Normal (stemless) diaphragm

Pressure accumulators with pre-charge pressure of 50 bar:

1 Upper limit A Filling pressure

2 Lower limit B Percussion pressure

Pressure accumulators with pre-charge pressure of 70 bar:

3 Upper limit A Filling pressure

4 Lower limit B Percussion pressure

Pressure of stabilizer accumulator

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

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RD1635C 40 bar
RD1840 30 bar

3.9 Mounting the pressure accumulator on the rock drill

Note! The positions of the HP and LP accumulators, related to the rock drill
body, might change between different rock drill models. Check the
correct positions from the service manual of the rock drill in question.
1. Remove the cover plugs from the accumulator connection port
2. Clean the joint surfaces both in the accumulator and in the rock drill.
3. Check that the bolts move easily in their threads in the drill body.
4. Lubricate the threads of the bolts with grease.
5. Fit the O-ring and the gasket.
6. By using a torque wrench, pre-tighten the accumulator bolts to 100 Nm
(10 kpm).
The four-bolt accumulator must be tightened using a cross-tightening
method 1-2-3-4.

1
3

4 2

7. By using a torque wrench, tighten the bolts to 200 Nm (20 kpm).

The four-bolt accumulator must be tightened using a cross-tightening
method 1-2-3-4.

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 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.

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MTA

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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

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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.

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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.

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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.

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• 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.

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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.

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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.

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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).

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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.

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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

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*** 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.

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www.sandvik.com
 ROCK DRILL SERVICE CARD N:o
Equipment S/n
Rock drill S/n
Percussion hours since last
service
drill. shifts/rounds
drilled meters

SERVICE INFORMATION
Purpose of the service Service man

Arrival date Previous service Edell. iskutunnit Work. hours Dism. Insp.

Departure date Previous service card n:r Rep. Ass. Total

REPLACED PARTS / PART INSPECTION

Qty Part no. Description Repaired Replaced OK Remarks
Piston
Front cylinder
Front bearing
Rear cylinder
Rear bearing
Distributor
LP. accumulator
HP. accumulator
Spacer
Gear housing
Rotation bushing
Rot. bush. bearing
Chuck
Connecting piece
Rotation motor
Rotation shaft
Rot. shaft bearings
Front cover / body
Flushing seal housing
Shank bearings

Perc.mechanism Rot.mechanism
Remarks tested tested

Cont.

C 00640-2 en 0607 1 (2)

C 00640-2 en 0607 2 (2)