Komatsu PC130-7, Shop Manual

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20-132
PC130-7
TESTING AND ADJUSTING
TESTING AND ADJUSTING OIL PRESSURE
IN PUMP LS CONTROL CIRCUIT
ADJUSTING
Adjusting LS valve
a
If the LS differential pressure is abnormal, adjust
LS valve (4) according to the procedure shown
below.
a
The figure shows the hydraulic pump seen from
the front side of the machine.
1. Loosen hose sleeve nut (4).
2. Fixing plug (5), loosen locknut (6).
3. Turn plug (5) to adjust the differential pressure.
a
If the plug is
•
turned to the right, the differential pres-
sure rises.
• turned to the left, the differential pressure
lowers.
a
Quantity of adjustment (LS differential pres-
sure) per turn of plug:
1,304 kPa {13.3 kg/cm
2
}
a
Tighten the hose sleeve nut (4) temporarily
and turn the plug, while checking the LS dif-
ferential pressure.
4. Fixing plug (5), tighten locknut (6).
3
Locknut: 98 – 122.5 Nm {10 – 12.5 kgm}
5. Tighten hose sleeve nut (4).
6. After finishing adjustment, check that the pres-
sure is normal according to the above described
procedure.
(1)