Automatic Lubrication System - Section 42 OM4202 Page 42-12 POSSIBLE CAUSES SUGGESTED CORRECTIVE ACTION TROUBLE: 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 inop- erative. Replace solenoid coil or valve. Broken gauge. Replace gauge. Damaged combination valve. Replace combination valve. TROUBLE: Pump Pressure Builds Very Slowly Or Not At All No pulsing signal at SV2. Check Timer.
Pressure reducing valve may be set too low. 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 sole- noid 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 grounded. Connect to good ground. Timer BAT (+) connection not on circuit continu- ously connected to BAT (+) terminal during opera- tion of vehicle. Establish direct connection between Timer BAT (+) connection and 24 V BAT (+) terminal. Fuse blown (circuit breaker tripped) on power con- nection on timer, or wire is otherwise damaged. Replace fuse (reset circuit breaker) or repair dam- aged wire. Loose wire connections at any of the timer termi- nals. Secure wire connections. TROUBLE: Timer Stays Timed Out Commutation failure in timer caused by damaged component.
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.