Section 4 - Maintenance OM4033.2 4-24 Automatic Lubrication System TROUBLE POSSIBLE CAUSES SUGGESTED CORRECTIVE ACTION Pump Pressure Builds Very Slowly Or Not At All No signal at 24V relay. Pressure switch may be defective Pressure reducing valve may be set too low. Grease viscosity may be too high for temperature at which pump is operating. Pump inlet check or outlet check may have foreign matter trapped causing leakage. Lubricant supply line leaks or is bro- ken. Insufficient hydraulic oil supply. Check Timer. Replace pressure switch. Refer to “Pressure Control Valve Adjust- ment”. Replace grease with a lower viscosity lubricant.
Remove, inspect and clean, if neces- sary.Inspect sealing surfaces between checks. Replace if rough or pitted. Repair lubricant supply line Check oil pressure and flow to motor. 24VDC Timer Not Operat- ing Timer BAT (-) connection is not on grounded member. Timer IGN terminal connection not on circuit continuously to circuit 71 during operation of vehicle. Loose wire connections at any of the timer terminals. Connect to good ground. Verify IGN terminal and circuit 71 connec- tion. Secure wire connections. Timer Stays Timed Out Commutation failure in timer caused by damaged component. Output relay contacts welded shut caused by extended short to ground. Replace Timer Replace Timer.
Timer Turns On At Inter- vals Two (2) To Ten (10) Times More Often Than Set Time Interval Electrical noise is being introduced into the power supply to the timer overcoming suppressor capacitor causing uncontrolled turn-on of its output relay. IMPORTANT: In some instances, elec- trical noise may be generated into vehicle electrical system which may cause timer to turn on at random inter- vals, independent of timer setting. If this occurs, a 250 to 1,000 MFD capacitor rated 150 to 350 VDC should be added across BAT (+) and BAT (-) terminals to suppress this noise and improve timer performance.
Timer Turns On At Inter- vals Faster Than Allow- able Tolerances Of Settings Timer out of adjustment or dam- aged component. Refer to “Timer Adjustment” and re-adjust timer or replace timer.