Maintenance - Section 4 Rotary Pump OM4026.2 4/00 Page 4-24 Automatic Lubrication System POSSIBLE CAUSES SUGGESTED CORRECTIVE ACTION TROUBLE: Pressure Gauge Does Not Register Pressure No system pressure to the pump motor. Check hydraulic hose from steering system. No 24 VDC signal at pump solenoid. Determine problem in 24 VDC electric system. Pressure reducing valve set too low. Refer to “Pressure Control Valve Adjustment”. Relay (RB7K5) may be defective. Replace relay. TROUBLE: Pump Pressure Builds Very Slowly Or Not At All No signal at RB7K5 relay. Check Timer and CB7. Pressure switch may be defective Replace pressure switch.
Grease viscosity may be too high for temperature at which pump is operating. Pressure reducing valve may be set too low. Replace grease with a lower viscosity lubricant. Refer to “Pressure Control Valve Adjustment”. Pump inlet check or outlet check may have foreign matter trapped causing leakage. Remove, inspect and clean, if necessary. Inspect sealing surfaces between checks. Replace if rough or pitted. Lubricant supply line leaks or is broken. Repair lubricant supply line Insufficient hydraulic oil supply. Check oil pressure and flow to motor. TROUBLE: Lube Cycle 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. 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 “IGN” terminal of timer instead of terminal marked “SOL”. Correct wiring hook-up.