Komatsu PC130-7, Shop Manual, Page: 56 / 342

20-138
PC130-7
TESTING AND ADJUSTING
3. Testing PPC valve
While the pressure in the accumulator is high,
set the safety lock lever in the LOCK/FREE posi-
tion and measure the lowering distance.
a
Operate the control lever while the starting
switch is in the ON position.
a
If the pressure in the accumulator is lost, run
the engine for about 10 seconds to heighten
the pressure in the accumulator.
a
If there is a difference in the lowering dis-
tance between the LOCK position and FREE
position, the PPC valve is defective (it has an
internal defect).
TESTING PARTS WHICH CAUSE HYDRAULIC DRIFT OF
WORK EQUIPMENT
(1)