Komatsu ecot3 PC300LC-8 Shop Manual page 815

40 Troubleshooting
Defective adjustment or mal-
Possible causes
6
function of LS valve
and standard
value in normal
state
7 Malfunction of servo piston
8 Defective piston pump
PC300, 350-8
Cause Standard value in normal state/Remarks on troubleshooting
a
Measured oil pres-
Pump discharge
pressure
LS valve output pres-
sure
If oil pressure does not become normal after adjustment, LS valve
may have malfunction or internal defect. Check LS valve directly.
Servo piston may have malfunction. Check it directly.
If any cause above is detected, cause may be lowering of perfor-
mance, malfunction, or internal defect of piston pump.
Prepare with engine stopped, then run engine at high idle and
carry out troubleshooting.
sure
All levers in neutral
Almost same pres-
SEN02633-03
Oil pressure ratio
Travel with no load
(Lever operated
halfway)
1
sure
Approx. 3/5
9