Komatsu PC200-8M0, Shop Manual, Page: 388 / 1254

SEN06127-00
30-101
36
PC200, 200LC, 220, 220LC-8M0
101 Testing and adjusting, Part 1
Testing and adjusting oil pressure in work equipment,
1. Adjusting work equipment and travel relief
pressure
a
If the relief pressure of the work equip-
ment circuit and travel circuit is abnormal,
adjust main relief valves (3) and (4)
according to the following procedure.
q
(3): Front (F) main relief valve
q
(4): Rear (R) main relief valve
a
When adjusting the main relief valves,
remove the top cover of the control valve.
a
Adjust only the low relief pressure of the
main relief valve. If the low repair proce-
dure is adjusted, the high repair procedure
is set automatically.
a
The low relief pressure is the pressure
applied when the 2-stage relief solenoid
valve is turned OFF and the pilot pressure
is not applied to the selector port.
1) Disconnect pilot hose (5).
2) While fixing holder (6), loosen locknut (7).
3) Turn holder (6) to adjust the set pressure.
a
If the holder is
q Turned to the right, the set pres-
sure is increased.
q Turned to the left, the set pres-
sure is decreased.
a
Quantity of adjustment per turn of
holder:
Approx. 20.5 MPa
{Approx. 209 kg/cm
2
}
4) While fixing holder (6), tighten locknut (7).
3 Locknut: 49 to 58.8 Nm {5 to 6 kgm}
5) Connect pilot hose (5).
6) After finishing adjustment, check again
that the oil pressure is normal according to
the above described measurement proce-
dure.
2. Adjusting swing relief pressure
a
If the swing relief pressure is abnormal,
adjust safety valve (8) of the swing motor
according to the following procedure.
1) While fixing adjustment screw (9), loosen
locknut (10).
2) Turn adjustment screw (9) to adjust the
pressure.
a
If the adjustment screw is
q Turned to the right, the set pres-
sure is increased.
q Turned to the left, the set pres-
sure is decreased.
a
Quantity of adjustment per turn of
adjustment screw:
Approx. 6.7 MPa
{Approx. 68.4 kg/cm
2
}
3) While fixing adjustment screw (9), tighten
locknut (10).
3 Locknut:
78 to 103 Nm {8 to 10.5 kgm}
4) After finishing adjustment, check again
that the oil pressure is normal according to
the above described measurement proce-
dure.