OM4006.2 10/98 Maintenance - Section 4 Automatic Lube System Page 4-23 POSSIBLE CAUSES SUGGESTED CORRECTIVE ACTION TROUBLE: Cylinder Pressure Gauge Does Not Register Pressure. No system pressure to the pump. Determine problem in hydraulic system. No 24 VDC signal at solenoids SV1 and SV2. Determine problem in 24 VDC electric system. Pressure reducing valve set too low. Increase setting by 1/2 turn to check operation. Primary solenoid valve SV1 may be inoperative. Replace solenoid coil or valve. Broken gauge. Damaged combination valve. Replace gauge. Replace combination valve. TROUBLE: Pump Pressure Builds Very Slowly Or Not At All. No pulsing signal at SV2.
Pressure reducing valve may be set too low. Check Timer. Increase setting by 1/2 turn to check operation. Grease viscosity may be too high for temperature at which pump is operating. Replace grease with a lower viscosity lubricant. If pressure is not building at all, secondary solenoid valve SV2 may be inoperative. Replace secondary solenoid valve SV2. Pump piston ball checks and inlet checks may have foreign matter trapped causing leakage. Remove, inspect and clean, if necessary. Inspect sealing surfaces between upper and lower inlet checks. Replace if rough or pitted. Shovel rod is rough or pitted. Replace shovel rod and packing. Lubricant supply line leaks or is broken.
Repair lubricant supply line Pulsing signal of cycle timer incorrect. Set flasher timer. TROUBLE: 24VDC Timer Not Operating: Timer BAT (-) connection is not on grounded member. Connect to good ground. Timer BAT (+ ) connection not on circuit continuously connected to BAT (+ ) terminal during operation of vehicle. Establish direct connection between Timer BAT (+ ) connection and 24 V BAT (+ ) terminal. Fuse blown (circuit breaker tripped) on power connec- tion on timer, or wire is otherwise damaged. Replace fuse (reset circuit breaker) or repair damaged wire. Loose wire connections at any of the timer terminals. Secure wire connections. TROUBLE: Timer Stays Timed Out:
Commutation failure in timer caused by damaged com- ponent. Replace Timer. Output relay contacts welded shut caused by extended short to ground. Replace Timer. Solenoid valve connected to "LUBE SW" terminal of timer instead of terminal marked "SOL". Correct wiring hook-up.