System Troubleshooting Chart; Pump Does Not Operate; Pump Will Not Prime; Pump Will Not Build Pressure - Komatsu 930E-2 Shop Manual

If the following procedures do not correct the problem, contact a factory authorized service center.
POSSIBLE CAUSES
TROUBLE: Pump Does Not Operate
Lube system not grounded.
Electrical power loss.
Timer malfunction.
Solenoid valve malfunctioning.
RB7K5 Relay malfunctioning
Motor or pump malfunction.
Pressure switch defective
NOTE: On initial startup of the lube system, the timing capacitor will not contain a charge, therefore the first timing
cycle will be about double in length compared to the normal interval. Subsequent timer cycles should be as specified.
TROUBLE: Pump Will Not Prime
Low lubricant supply.
TROUBLE: Pump Will Not Build Pressure
Air trapped in lubricant supply line.
Lubricant supply line leaking.
Vent valve leaking.
Pump worn or scored.
TROUBLE: Injector Indicator Stem Does Not Operate
NOTE: Normally, during operation, the injector indicator stem will move into the body of the injector when pressure
builds properly. When the system vents (pressure release) the indicator stem will again move out into the adjusting
yoke.
Malfunctioning injector - usually indicated by the pump
building pressure and then venting.
All injectors inoperative - pump build up not sufficient
to cycle injectors.
P03018 4/00

SYSTEM TROUBLESHOOTING CHART

Automatic Lubrication System
SUGGESTED CORRECTIVE ACTION
Correct grounding connections to pump assembly and
truck chassis.
Locate cause of power loss and repair. Check circuit
breaker CB7. Be sure keyswitch is "ON".
Replace timer assembly
Replace the solenoid valve assembly
Replace relay
Replace motor and/or pump assembly
Replace pressure switch
Dirt in reservoir, pump inlet clogged, filter clogged.
Prime system to remove trapped air.
Check lines and connections to repair leakage.
Clean or replace vent valve.
Repair or replace pump assembly.
Replace individual injector assembly.
Service and/or replace pump assembly.
P3- 13