DD311 THC562 DRILLING SYSTEM

210
24

175
25

C
D

B
CONTROL BLOCK OF DRILLING

23

22

26
X4 X5
A

M6
M1

180 T4
29 30
250
X1 211
P2
X8

X7

M5

A1
P1 3
9
M3
9 175
7

16 5
X3
4 8
PE

15
X2 18 M4
M9
90

6
10 42
X6
LS2
M8
55175240

30
210

43

210
910
P5
M10 X9 M7 LS1 M2 T3

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DD311 THC562 DRILLING SYSTEM

4.1.2. Anti-jamming and return automatics control block (911)

M2 M3
M1 X1 X2 X10 X4 X5

3
14

8 8 10

13 4 LS2
7 13
10 LS1
11
14 12
9
15 P4
9 7 P3
T
X8
11 12 6
4
2
3
18
X9 P1 P2 X6
911
6 19

21
20
16
17 2

COIL
TIGHTENING
N° COMPONENTS TIGHTENING
TORQUE (Nm)
TORQUE NM
2 Anti-jamming valve
3 Anti jamming flushing control valve 34 7
4 Return automatics selector valve 34 7
6 Shuttle valve 34
7 Shuttle valve 34
8 Shuttle valve 34
9 Shuttle valve 34
10 Shuttle valve 34
11 Shuttle valve 34
12 Jet
13 Shuttle valve 34
14 Fast feed forwards selector valve 34
15 Plug 30
16 Plug 12
17 Screw M5x30 9
18 Measuring connector 55
19 Fitting 55
20 Fitting 55
21 Fitting 80

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 DD311 THC562 DRILLING SYSTEM

4.1.3. Drilling rotation control block (912)

55

65

56

52

57

53

P2 M a b B A
P
LS

57
180
15

53
55 56 65 52

T2

912 T

TIGHTENING
N° COMPONENTS
TORQUE (Nm)
52 Pressure compensator 70
53 Rotation directional valve
55 Rotation maximum pressure relief valve 100
56 Flow control valve 20
57 Non-return valve 15
65 LS pressure relief valve 20

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DD311 THC562 DRILLING SYSTEM

4.1.4. Feed power setting control block (905)

905

2 1

905

TIGHTENING
N° COMPONENTS
TORQUE (Nm)
905 Feed pressure regulating valve 33.9

4.1.5. Feed deviation / Drilling torque control block (9033)

X3

2
P
3.1

X1 2

3.1
X2 9033
3.2

T3 T1 T2
3.2

TIGHTENING TORQUE
N° COMPONENTS
[NM] (FOR THE CAP)
2 Feed deviation valve 40
3.1 Directional valve 33.9
3.2 Feed ls line return circuit selector 33.9

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 DD311 THC562 DRILLING SYSTEM

4.1.6. Rotation speed control block (906)

Rotation speed adjustement

Drilling 906
mode
3.2 3.1 Y533
2.1
3.1 R1 P1
Y533
T
1.1
3.2 R2 P2

Reaming Pp
mode

1.1

TIGHTENING TORQUE
N° COMPONENTS
[NM] (FOR THE CAP)
1.1 Shuttle valve 33.9
Y533 Coil 33.9
3.1 Pressure relief valve (R1) 33.9
3.2 Pressure relief valve (R2) 33.9

4.1.7. Torque control valve (9153)

Y319
2

Y319

1 3
9153

TIGHTENING TORQUE
N° COMPONENTS
[NM] (FOR THE CAP)
Y319 Coil 33.9

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DD311 THC562 DRILLING SYSTEM

4.1.8. Boom and drilling inhibition valve (9032)

Y456
Y455

X1
X2
Boom and drill inhibition
A1 A2
X1 X2

9032 Y455 Y456

P1 P2 T

TIGHTENING COIL
N° COMPONENTS TORQUE TIGHTENING
[NM] (FOR THE CAP) TORQUE NM
X1 Drilling inhibition pilot valve
X2 Boom movement inhibition pilot valve
Y455 Solenoid 34 7
Y456 Solenoid 34 7

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 DD311 THC562 DRILLING SYSTEM

4.1.9. Feed auto-return control block (904)

124 123 125

SF

R
M
SR
GF

P
P
121 119
GR

T
126

120 118
126 124
127 R1 MR MF F1
125 123

SR SF

118 119

120 121
T P
127

NO COMPONENT TIGHTENING TORQUE

[NM] (FOR THE CAP)
118 Pressure relief valve 30
119 Pressure relief valve 30
120 Jet stabilizes rear limit impulse cylinder pressure 10
121 Jet stabilizes front limit impulse cylinder pressure 10
123 Pressure switch 40
124 Check valve 25
125 Pressure switch 40
126 Check valve 25
127 Pressure reducing valve 17

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DD311 THC562 DRILLING SYSTEM

4.2. DD311 General hydraulic diagram

BOOM AND
910 FEED AND PERCUSSION 9032
DRILLING A2
CONTROL BLOCK
P1 LS1 T3 LS2 M4 P5
INHIBITION VALVE
P2 T

911
UNFILTERED
LS2 FRONT
COLLECTOR
LS1 T

660

641

644

800

801

S3 T5 S2 T4 S1 T3 T2 T1

31

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 DD311 THC562 DRILLING SYSTEM

924 ROTATION 912

BOOM
P1 CONTROL
CONTROL VALVE
P2 P X LS T P
VALVE T

CARRIER
COLLECTOR

903

27
174
MANUAL
FILLING
241 E PUMP

OL

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DD311 THC562 DRILLING SYSTEM

4.3. THC562 Hydraulic diagram

ROTATION PERCUSSION FEED RAPID MOVEMENT TO THE WATER/AIR

VALVES (1453) (1454)

ANTICLOKWISE

BACKWARD
HAMMERING

FORWARD
(DRILLING)

BACKWARD
CLOKWISE

FORWARD
OPENING)

DRILLING
(THREAD
T T
Y319
P P

907
908
33
S72 S70 S71
1 2 1 2 1 2 1 2

ROTATION SPEED
ADJUSTMENT
drilling
mode Y533
906
P1
R1
406
T

P2
R2

reaming Pp
mode

408 407
R1 MR MF F1
SR SF OPTION
FDM

ROTATION
SP5
ROTATION ANTI - JAMMING
9149 & AUTO RETURN
T P 400 CONTROL BLOCK
ROTATION

To driling control DRILLING CONTROL

block (910) port M8
904 0 250
X8 LS1 LS2 P4

927 6
X9 911
M1
12
P2 M a b B A X1
P 3 M2
7 8 X2
LS 1Y13
X3
57 a

56 X10
9
180
15

P1
14
55 65 P2 13
52 2 X4
53 80 bar
X6
T2 10
1Y47 X5
11
T
ROTATION CONTROL BLOCK 4 M3
912 T P3

660 7
2
9
6
4 8
8
5
2
7 903 5 11

4 3 1
6 9

1 CARRIER
UNFILTERD COLLECTOR
FRONT
COLLECTOR

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 DD311 THC562 DRILLING SYSTEM

TO THE WATER/AIR FEED DEVIATION / POWER

VALVES (1453) (1454)
TORQUE DRILLING SETTING

TO BOOM CONTROL VALVE

TO THE SLU (1411)
X3

905

(924) PORT P1
2 P 2 1
3.1

PORT P
X1

Y319
2
3.2 9033
X2

1 3

T3 T1 T2 BOOM & DRILL

9153 A1 A2
INHIBITION
PERCUSSION
Y455 Y456 9032

PERCUSSION
TO WATER
P1 P2 T
COOLER (27)

8 3
400 5 7
9147 4 2
660

FEED
6 9

PERCUSSION
1
OPTION OPTION
406 OPTION FEED FDM 0 250 FDM 9148 0 250
CFX
FEED

405 FEED
SP3 925
PERCUSSION
SP4 926
A C B B A
TO BOOM CTRL
VALVE (924)
PORT X FROM BOOM CTRL
VALVE (924)
PORT LS
M6 T4 P2 X8 X7 M5 A1 M3 PE M4 LS2

T3
X5
9036
P1 M2
25 bar
42
2 X4
P3 P2
3 Y461 4 Y460 LS1
7
175

M7
T
10
211
8
250

18
DRILLING CONTROL 5
BLOCK
180

B A
X9
30
90
24 26 6
210

3
25
43
175

29 4
30

23
16 15
22 2 210
M10

210 P5

C D M1 X1 P1 X3 X2 M9 X6 M8
9
M 910

900 1S190
OUT 10 bar

S180
20µm
IN
641
B

800 644
100
cc/rev 1470 RPM/50Hz
1760 RPM/60Hz

30b 225b

x
801
L1 L S

0.3 bar 0.003 bar

S2 T1 S1
BR

165L

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4.4. Components and function

FEED AND PERCUSSION CONTROL BLOC (910)
ITEM DESCRIPTION FUNCTION
2 Percussion line pressure com- Keeps percussion pressure constant, irrespective of
pensator variations in input pressure
3 Percussion main valve Control oil flow to rock drill, controlled by percussion
selector valve (4)
4 Percussion selector valve Opens and closes percussion main valve (3) accord-
ing to pilot percussion control valve (S70)
5 Percussion pressure selector Selects half or full power percussion
valve
6 Percussion half power pres- Determines pressure level for percussion half power
sure relief valve
7 Max. pressure percussion Determines percussion max. pressure
relief valve
8 Rattling ON/OFF valve Allows full percussion pressure
9 Jet Restricts oil flow in percussion LS line
10 Shuttle valve Directs percussion, feed, or boom LS signal to vari-
able displacement pump
15 Shuttle valve Directs pressure from percussion pilot valve (S70) to
percussion selector valve (4)
16 Shuttle valve Directs pressure from percussion pilot valve (S70) or
feed pilot valve (S71) to percussion pressure selector
valve (5)
18 Monitoring valve Determines min. percussion pressure when drilling at
full power
22 Feed line pressure compensa- Keep feed pressure constant, irrespective of input
tor pressure variations
23 Feed directional valve Directs oil flow to feed according to pilot valves (S71)
and (33)
24 Feed line B max. pressure Avoid pressure peaks in feed line B
relief valve
25 Feed line A max. pressure Avoid pressure peaks in feed line A
relief valve
26 Shuttle valve Directs oil flow in LS line for feed cylinder or stand by
position
29 Feed LS line selector valve Selects normal feed pressure or fast feed pressure
according to pilot valves (S71) and (33)
30 Fast feed max. pressure relief Determines max. pressure for fast feed movement
valve
42 Shuttle valve Directs LS signal of feed or boom circuit to variable
displacement pump
43 Pilot pressure regulating valve Sets pilot circuit pressure
210 Pressure reducing and reliev- Reduces pressure for boom movements
ing valve
211 Max pressure valve Protects the whole drilling circuit

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 DD311 THC562 DRILLING SYSTEM

ANTI-JAMMING AND AUTOMATIC RETURN CONTROL BLOC (911)

ITEM DESCRIPTION FUNCTION
2 Anti-jamming valve Activates feed backward if the rod is jammed
3 Anti jamming flushing control Activates feed backward if the bit is clogged”
valve
4 Automatic return valve Activates the feed backward when the front impulse
cylinder is pressurized.
6 Shuttle valve Directs pressure information of rotation pressure or
drilling pressure to the anti jamming valve 2.
7 Shuttle valve Directs pressure information of LS circuit or drilling
pressure to the variable displacement pump 801.
8 Shuttle valve Directs pressure information of feed pilot valve (S71)
or fast feed pilot valve to the feed directional valve
(23)
9 Shuttle valve Directs pressure information of feed pilot valve S71
forward or backward to the shuttle valve 13
10 Shuttle valve Directs pressure information of feed pilot valve (31) or
fast feed control valve (33) to feed directional valve
(23) (reverse feed)
11 Return automatics selector Controls feed directional valve (23) according to the
valve value set by pilot pressure regulating valve (43)
12 Orifice Restricts oil flow in LS line
13 Shuttle valve Directs pressure information of feed pilot valve (S71)
to percussion pressure selector valve (5) and to feed
LS line selector valve (29)
14 Fast feed forwards selector Dedicated to scaling purposes
valve

ROTATION CONTROL BLOC (912)

ITEM DESCRIPTION FUNCTION
52 Pressure compensator Controls rotation pressure independantly of the pres-
sure circuit variations
53 Rotation directional valve Controls oil flow to rock drill rotation motor
55 Regulator valve Controls oil flow of rotation valve into tank during
stand-by situation and during rotation control.
56 Flow control valve Depressurises the LS line
57 Non--return valve Prevents oil
flow back to pump (800)
65 Rotation LS-pressure relief Determines max. pressure of rotation circuit
valve

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FEED DEVIATION/TORQUE CONTROL VALVE (9033)

ITEM DESCRIPTION FUNCTION
2 Feed pressure regulating Determines feed pressure for collaring and in full
valve power drilling,
3.2 Selector valve for feed LS line Selects correct return line automatically for forward/
return circuit reverse feed
3.1 Directional valve Directs oil flow into the tank or into the feed circuit

FEED AUTOMATIC RETURN CONTROL BLOC (904)

Item Description Function
118 Pressure relief valve Determines pressure level for rear limit impulse
cylinder
119 Pressure relief valve Determines pressure level for front limit impulse
cylinder
120 Jet Stabilizes rear limit
impulse cylinder pressure
121 Jet Stabilizes front limit
impulse cylinder pressure
123 Pressure switch Monitors pressure of the front limit impulse cylinder
124 Check valve Prevents return flow from front limit impulse cylinder
125 Pressure switch Monitors pressure of the rear limit impulse cylinder
126 Check valve Prevents return flow from rear limit impulse cylinder
127 Pressure regulating valve Limits feed pressure for front and rear limit impulse
circuit

FEED PRESSURE CONTROL BLOC (905)

ITEM DESCRIPTION FUNCTION
20 Feed pressure regulating Determines feed pressure for collaring and in full
valve power drilling, affects not only feed pressure but also
percussion pressure (feed/percussion monitoring)

ROTATION PERCUSSION FEED CONTROL BLOC (907)

ITEM DESCRIPTION FUNCTION
S70 Percussion pilot control valve Turns percussion on for drilling and thread--
loosening
S71 Feed pilot control valve Determines feed speed and direction, and sets
percussion to full power for drilling
S72 Rotation pilot control valve Determines direction of rotation
1 Orifice Restricts oil flow to directional valve of rotation (53)
and to rota-speed regulating valve (906)
2 Orifice Restricts oil flow to directional valve of rotation (53)
and to rota-speed regulating valve (906)

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FEED RAPID MOVEMENT CONTROL BLOC (908)

ITEM DESCRIPTION FUNCTION
33 Fast feed pilot control valve Determines fast feed speed and direction

ROTATION SPEED ADJUSTING BLOC (906)

ITEM DESCRIPTION FUNCTION
Y533 Selecting electro valve Select drilling rotation or reaming rotation speed
adjustment.
-- Shuttle valve Directs pilot control pressure info to rot. selecting
rotation speed adjustment valve (Y533)
R1 Drilling rotation pressure Sets drilling rotation speed to desired value
regulating valve
R2 Reaming rotation pressure Sets reaming rotation speed to desired value
regulating valve

OTHERS COMPONENTS
ITEM DESCRIPTION FUNCTION
27 Cooler Oil cooler for drilling and carrier hydraulics return
flows
31 Return oil filter
641 Pressure filter Filters oil coming from variable displacement pump
(801)
644 Non-return valve Prevents oil flow back to variable displacement
pump
660 Collecting piece For drilling and carrier hydraulics return flows
800 Gear pump Output of oil flow to rotation circuit
801 Variable displacement pump Output for percussion, feed, boom hydraulics, and
pilot control
900 Pressure switch Switches on percussion hour meter
903 Collecting piece For drilling and carrier hydraulics return flows
925 Percussion pressure gauge Indicates percussion line pressure
926 Feed pressure gauge Indicates feed pressure
927 Rotation pressure gauge Indicates rotation pressure
1453 Air control valve Controls air flow to rock drill
1454 Water control valve Controls water flow to rock drill
9032 Boom and drilling inhibition Controls the activation or deactivation of the boom
switches valves and drilling movement
9153 Torque control activation On/Off torque control
valve

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5. Operation of system

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5. OPERATION OF SYSTEM

5.1. Filtering and cooling

Filtering of hydraulic fluid

The system uses pressure and return filtering. Pressure filtering is used in the drilling pump
(801), but return flow filtering is common to both pumps.
Hose-mounted filter (641) with filtering capacity of 20 µm abs. is used for pressure filtering. If the
pressure difference over the filter rises over 2.5 bar, the pressure switch 1S180 turns the
indicator light (H611) on the indicator light panel goes on, indicating that the filter element should
be replaced. The filtering unit body is also equipped with by-pass valve that opens if the pressure
difference exceeds 3.5 bar.
The return flow of both pumps passes through the return filter (31). The return filter is mounted on
the tank. The filtering capacity of the return filter element is 10µm abs. A visual indicator located
on the filter itself informs the operator when the filter element should be changed.

The filtering unit body is also equipped with by-pass valve that opens if the pressure difference
exceeds 1.6 bar.

The manufacturer’s recommendation for the purity class of the system is 20/15/12 according to
the ISO4406 (c).

Note! If the oil is cold (below +30°c), both pressure and return oil filter monitoring are by-
passed to avoid unnecessary alarms caused by the high viscosity of cold oil.

Air filtering of hydraulic oil tank

The hydraulic oil tank is also equipped with an air filter. Its filtering capacity is 5µm. This filter has
no monitoring indicators but, to ensure the cleanness of hydraulic oil, it should be replaced
according to the service instructions.

Cooling of hydraulic system

The oil returning from various actuators (except leakage oil) is gathered together is common
return line using collector (660) and (903) located on the front chassis. From the collector (660)
return oil goes and straight to the drilling tank. From the collector (903) the return oil goes through
to the oil/water cooler (27) and then to the return oil filter (31) into the hydraulic oil tank.
The oil/water cooler (27) is always in operation when water flushing is on.

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 DD311 THC562 DRILLING SYSTEM

5.2. Drilling oil temperature

After cold start, hydraulic oil should be warmed up to drilling temperature before drilling is started.
This can be accomplished, for instance, by using an electric oil heater in the tank.
The recommended oil temperature of the drilling is between 40-- 60 degrees (depending on the
type of the oil).

5.3. Reading diagrams

The following colors has been used in hydraulic diagrams for explaining different drilling
operations.
The following colors has been used in hydraulic diagrams for explaining different drilling
operations.

Blue -- percussion Dash blue -- percussion return line

Short dash blue -- percussion LS--line
Red -- feed Dash red -- feed return line
Short dash red -- feed LS--line
Green -- rotation Dash green -- rotation return line
Short dash green -- rotation LS--line
Yellow -- pilot control Dash yellow -- pilot return line
Short dash yellow -- pilot line
Brown -- automatic return Dash brown -- automatic return line
Violet -- stabilizer Dash violet -- stabilizer return line

5.3.1. Valves

TheThe
number of theofcoil
number theis coil
colored red when
is colored redthe coil is
when activated.
the coil is activated.
Y5/Y6

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DD311 THC562 DRILLING SYSTEM

5.4. Free circulation

Free circulation means a situation where the power pack is running, but no hydraulic actuators
are used.

ROTATION PERCUSSION FEED RAPID MOVEMENT TO THE WATER/AIR

VALVES (1453) (1454)
ANTICLOKWISE

BACKWARD
HAMMERING

FORWARD
(DRILLING)

BACKWARD
CLOKWISE

FORWARD
OPENING)

DRILLING
(THREAD

T T
Y319
P P

907
908
33
S72 S70 S71
1 2 1 2 1 2 1 2

ROTATION SPEED
ADJUSTMENT
drilling
mode Y533
906
P1
R1
406
T

P2
R2

reaming Pp
mode

408 407
R1 MR MF F1
SR SF
OPTION
FDM

ROTATION
SP5
ROTATION ANTI - JAMMING
9149 & AUTO RETURN
T P
400 CONTROL BLOCK
ROTATION

To driling control
block (910) port M8 DRILLING CONTROL
904 0 250

X8 LS1 LS2 P4

927 6
X9 911
M1
12
P2 M a b B A X1
P 3 M2
7 8 X2
LS 1Y13
X3
57 a

56 X10
9
180
15

P1
14
55 65 P2 13
52 2 X4
53 80 bar
X6
T2 10
1Y47 X5
11
T
ROTATION CONTROL BLOCK 4 M3
912 T P3

660 7
2
9
6
4 8
8
5
2
7 903 5 11

4 3 1
6 9

1 CARRIER
UNFILTERD COLLECTOR
FRONT
COLLECTOR

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