OM4026.2 4/00 Rotary Pump Maintenance - Section 4 Automatic Lubrication System Page 4-23 SYSTEM TROUBLESHOOTING CHART If the following procedures do not correct the problem, contact a factory authorized service center. POSSIBLE CAUSES SUGGESTED CORRECTIVE ACTION TROUBLE: Pump Does Not Operate Lube system not grounded. Correct grounding connections to pump assembly and truck chassis. Electrical power loss. Locate cause of power loss and repair. Check circuit breaker CB7. Be sure keyswitch is “ON”. Timer malfunction. Replace timer assembly Solenoid valve malfunctioning. Replace the solenoid valve assembly RB7K5 Relay malfunctioning Replace relay Motor or pump malfunction.
Replace motor and/or pump assembly Pressure switch defective Replace pressure switch 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. Dirt in reservoir, pump inlet clogged, filter clogged. TROUBLE: Pump Will Not Build Pressure Air trapped in lubricant supply line. Prime system to remove trapped air. Lubricant supply line leaking. Vent valve leaking. Check lines and connections to repair leakage. Clean or replace vent valve. Pump worn or scored.
Repair or replace pump assembly. 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. Replace individual injector assembly. All injectors inoperative - pump build up not sufficient to cycle injectors. Service and/or replace pump assembly.