This document contains service manual instructions and adjustment protocols for an LH 120 M machine. It provides detailed steps for adjusting the working pumps and checking the pressure cut-off for each pump. The document includes adjusting the pump control chamber pressure using either a recirculation pressure method or by reducing the primary pressure. It also specifies adjusting pump parameters like force values and control variables using the Sculi interface.

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2. Service Manual
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MJFCIFSS
Introduction 010
Technical data 020
Maintenance 030
Drive group 040
Cooling system 050
Working hydraulics 060
Travel hydraulics 070
Hydraulic components 080
Steering system 090
Brake system 100
Electrical system 110
Travel gear mechanism 120
Axles / Drive 130
Steel parts - basic machine 140
Working equipment 150
Cab / heating / air conditioning 160
Lubrication system 170
Slewing gear mechanism / Slewing ring 180
Factory spezific 190
Options 200
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11. Service Manual
Adjustment protocol
030.050.9
Checking and adjusting tasks for LH 120 M
copyright by
Working pump 1 (begin of regulation)
Option 1:
(adjustment with recirculation
pressure)
Speed: Mode P
Safety lever S7 in upper position
Reduce the test current through
Sculi variable
QRWorkingPump1Y101
to approx. 180 mA, then increase
the test current slowly until the
control chamber pressure (pSk)
begins to rise.
Increase of control chamber
pressure
mA
bar
200-220
15±2 ....... ....... Y101 M21
Check/adjustment
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12. Checking and adjusting tasks for LH 120 M Service Manual
Adjustment protocol
030.050.10
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Option 2:
(adjustment by reduction of
primary pressure)
Speed: Mode P
Safety lever S7 in lower position
Function:
Actuate "Extend hoist cylinder"
Reduce primary pressure to bar 50 ....... ...... 5055 M25
Check/adjustment
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13. Service Manual
Adjustment protocol
030.050.11
Checking and adjusting tasks for LH 120 M
copyright by
MRPosCtrlForceValuePump1
In Sculi, change value (A) to 1000
MXPosCtrlPump1
In Sculi, change value (B) to 1
MXPosCtrlTestWorkingPump
1
In Sculi, change value (C) to 1
QRWorkingPump1Y101
Reduce value (D) to approx. 180
mA, then increase the test
current slowly until the control
chamber pressure (pSk) begins
to rise.
Increase of control chamber
pressure
mA
bar
200-220
30±2 ....... ....... Y101 M21
After check/adjustment: Right-
click the box to deselect it (E)
and select "Remove force".
MRPosCtrlForceValuePump1
In Sculi, change value (A) to 0
MXPosCtrlPump1
In Sculi, change value (B) to 0
MXPosCtrlTestWorkingPump
1
In Sculi, change value (C) to 0
Check/adjustment
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14. Checking and adjusting tasks for LH 120 M Service Manual
Adjustment protocol
030.050.12
copyright by
Working pump 2 (begin of regulation)
Option 1:
(adjustment with recirculation
pressure)
Speed: Mode P
Safety lever S7 in upper position
Reduce the test current through
Sculi variable
QRWorkingPump2Y102
to approx. 180 mA, then increase
the test current slowly until the
control chamber pressure (pSk)
begins to rise.
Increase of control chamber
pressure
mA
bar
200-220
15±2 ....... ....... Y102 M22
Check/adjustment
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15. Service Manual
Adjustment protocol
030.050.13
Checking and adjusting tasks for LH 120 M
copyright by
Option 2:
(adjustment by reduction of
primary pressure)
Speed: Mode P
Safety lever S7 in lower position
Function:
Actuate "Extend stick cylinder"
Reduce primary pressure to bar 50 ....... ...... 5055 M22
MRPosCtrlForceValuePump2
In Sculi, change value (A) to 1000
MXPosCtrlPump2
In Sculi, change value (B) to 1
MXPosCtrlTestWorkingPump
2
In Sculi, change value (C) to 1
QRWorkingPump2Y102
Reduce value (D) to approx. 180
mA, then increase the test
current slowly until the control
chamber pressure (pSk) begins
to rise.
Increase of control chamber
pressure
mA
bar
200-220
30±2
....... ....... Y102 M22
After check/adjustment: Right-
click the box to deselect it (E)
and select "Remove force".
MRPosCtrlForceValuePump2
In Sculi, change value (A) to 0
MXPosCtrlPump2
In Sculi, change value (B) to 0
MXPosCtrlTestWorkingPump
2
In Sculi, change value (C) to 0
Check/adjustment
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16. Checking and adjusting tasks for LH 120 M Service Manual
Adjustment protocol
030.050.14
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Working pump 3 (begin of regulation)
Option 1:
(adjustment with recirculation
pressure)
Speed: Mode P
Safety lever S7 in upper position
Reduce the test current through
Sculi variable
QRWorkingPump3Y201
to approx. 180 mA, then increase
the test current slowly until the
control chamber pressure (pSk)
begins to rise.
Increase of control chamber
pressure
mA
bar
200-220
15±2 ....... ....... Y201 M23
Check/adjustment
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17. Service Manual
Adjustment protocol
030.050.15
Checking and adjusting tasks for LH 120 M
copyright by
Option 2:
(adjustment by reduction of
primary pressure)
Speed: Mode P
Safety lever S7 in lower position
Function:
Actuate "Retract stick cylinder"
Reduce primary pressure to bar 50 ....... ...... 5065 M27
MRPosCtrlForceValuePump3
In Sculi, change value (A) to 1000
MXPosCtrlPump3
In Sculi, change value (B) to 1
MXPosCtrlTestWorkingPump
3
In Sculi, change value (C) to 1
QRWorkingPump3Y201
Reduce value (D) to approx. 180
mA, then increase the test
current slowly until the control
chamber pressure (pSk) begins
to rise.
Increase of control chamber
pressure
mA
bar
200-220
30±2
....... ....... Y201 M23
After check/adjustment: Right-
click the box to deselect it (E)
and select "Remove force".
MRPosCtrlForceValuePump3
In Sculi, change value (A) to 0
MXPosCtrlPump3
In Sculi, change value (B) to 0
MXPosCtrlTestWorkingPump
3
In Sculi, change value (C) to 0
Check/adjustment
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18. Checking and adjusting tasks for LH 120 M Service Manual
Adjustment protocol
030.050.16
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Working pump 4 (begin of regulation)
Option 1:
(adjustment with recirculation
pressure)
Speed: Mode P
Safety lever S7 in upper position
Reduce the test current through
Sculi variable
QRWorkingPump4Y202
to approx. 180 mA, then increase
the test current slowly until the
control chamber pressure (pSk)
begins to rise.
Increase of control chamber
pressure
mA
bar
200-220
15±2 ....... ....... Y202 M24
Check/adjustment
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19. Service Manual
Adjustment protocol
030.050.17
Checking and adjusting tasks for LH 120 M
copyright by
Option 2:
(adjustment by reduction of
primary pressure)
Speed: Mode P
Safety lever S7 in lower position
Function:
Actuate "Extend hoist cylinder"
Reduce primary pressure to bar 50 ....... ...... 5065 M28
MRPosCtrlForceValuePump4
In Sculi, change value (A) to 1000
MXPosCtrlPump4
In Sculi, change value (B) to 1
MXPosCtrlTestWorkingPump
4
In Sculi, change value (C) to 1
QRWorkingPump4Y202
Reduce value (D) to approx. 180
mA, then increase the test
current slowly until the control
chamber pressure (pSk) begins
to rise.
Increase of control chamber
pressure
mA
bar
200-220
30±2
....... ....... Y202 M24
After check/adjustment: Right-
click the box to deselect it (E)
and select "Remove force".
MRPosCtrlForceValuePump4
In Sculi, change value (A) to 0
MXPosCtrlPump4
In Sculi, change value (B) to 0
MXPosCtrlTestWorkingPump
4
In Sculi, change value (C) to 0
Check/adjustment
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21. Checking and adjusting tasks for LH 120 M Service Manual
Adjustment protocol
030.050.18
copyright by
Working pump 1 (pressure cut-off)
Note!
End-of-travel cushioning must be deactivated (see “End-of-travel
cushioning” on page 2).
Test current through Sculi
variable:
QRWorkingpump1Y101
mA 600 ....... ....... -----
Test current through Sculi
variable:
QRWorkingpump2Y102
mA 0 ....... ....... -----
Test current through Sculi
variable:
QRWorkingpump3Y201
mA 0 ....... ....... -----
Test current through Sculi
variable:
QRWorkingpump4Y202
mA 0 ....... ....... -----
Speed: Mode P
Function:
Actuate "Extend hoist cylinder"
Primary pressure control block
5100
bar 345 ....... ....... 5055 M25
Control chamber pressure bar 230±10 ....... ....... 2160 M21
Check/adjustment
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22. Service Manual
Adjustment protocol
030.050.19
Checking and adjusting tasks for LH 120 M
copyright by
Working pump 2 (pressure cut-off)
Note!
End-of-travel cushioning must be deactivated (see “End-of-travel
cushioning” on page 2).
Test current through Sculi
variable:
QRWorkingpump1Y101
mA 0 ....... ....... -----
Test current through Sculi
variable:
QRWorkingpump2Y102
mA 600 ....... ....... -----
Test current through Sculi
variable:
QRWorkingpump3Y201
mA 0 ....... ....... -----
Test current through Sculi
variable:
QRWorkingpump4Y202
mA 0 ....... ....... -----
Speed: Mode P
Function:
Actuate "Extend stick cylinder"
Primary pressure control block
5100
bar 345 ....... ....... 5055 M26
Control chamber pressure bar 230±10 ....... ....... 2260 M22
Check/adjustment
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23. Checking and adjusting tasks for LH 120 M Service Manual
Adjustment protocol
030.050.20
copyright by
Working pump 3 (pressure cut-off)
Note!
End-of-travel cushioning must be deactivated (see “End-of-travel
cushioning” on page 2).
Test current through Sculi
variable:
QRWorkingpump1Y101
mA 0 ....... ....... -----
Test current through Sculi
variable:
QRWorkingpump2Y102
mA 0 ....... ....... -----
Test current through Sculi
variable:
QRWorkingpump3Y201
mA 600 ....... ....... -----
Test current through Sculi
variable:
QRWorkingpump4Y202
mA 0 ....... ....... -----
Speed: Mode P
Function:
Actuate "Extend stick cylinder"
Primary pressure control block
5200
bar 345 ....... ....... 5065 M27
Control chamber pressure bar 230±10
....... ....... 2360 M23
Check/adjustment
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