Komatsu Galeo PC138US-8 Shop Manual page 371

30 Testing and adjusting
3. Checking PPC valve
While the pressure in the accumulator is high,
set the lock lever in the LOCK/FREE position
and test 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 5 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).
PC138US, USLC-8
SEN02458-01
43