OM4206 10/06 Maintenance - Section 42 Automatic Lubrication System Page 42-13 Lubrication Cycle Timer Adjustment The timer is set at the factory for a nominal 2.5 minute (off time) interval. Dwell time is approximately 75 seconds. A longer interval (off time) is obtained by turning the timer selector to the desired position. 250 Hour Inspection 1. Check all grease hoses from the SL-1 injectors to the lubrication points. Refer to Figure 42-2. a. Repair or replace all worn and broken hoses. Set the timer by turning the timer selector to the 2.5 minute setting. Then turn the selector clockwise one detent at a time to the desired setting, or until the maximum limit of 80 minutes is reached. b.
Ensure all the air is purged and all new feed line hoses are filled with grease before send- ing the truck back into service. 2. Check all grease supply line hoses from the pump to the SL-1 injectors. NOTE: The timer is a sealed unit. DO NOT attempt to disassemble it. a. Repair or replace all worn and broken supply lines. PREVENTIVE MAINTENANCE INSPECTION b. Ensure all air is purged and all new supply line hoses are filled with grease before send- ing the truck back into service. Use the following maintenance procedures to ensure proper system operation. 3. Check the grease reservoir level. a. Fill the reservoir if low. Check the filter bypass indicator when filling the reservoir.
Replace the element if bypassing. 10 Hour Lubrication System Inspection 1. Check the grease reservoir level. Inspect the grease level height after each shift of operation. The grease usage must be consis- tent from day-to-day operations. b. Check the reservoir for contaminants. Clean, if required. c. Check that all filler plugs, covers, and breather vents on the reservoir are intact and free of contaminants. Lack of lubricant usage would indicate an inop- erative system. Excessive usage would indicate a broken supply line. 4. Inspect all bearing points for a bead of lubricant around the bearing seal. 2. Check the filter bypass indicator when filling the reservoir.
Replace the element if bypassing. It is good practice to manually lubricate each bearing point at the grease fitting provided on each Injector. This will indicate if there are any frozen or plugged bearings, and will help flush the bearings of contaminants. 3. Check all the grease hoses from the SL-1 injec- tors to the lubrication points. a. Repair or replace all damaged feed line hoses. 5. System Checkout. b. Ensure all air is purged and all new feed line hoses are filled with grease before sending the truck back into service. a. Remove all SL-1 injector cover caps to allow visual inspection of the injector cycle indica- tor pins during system operation. 4.
Inspect the key lubrication points for a bead of lubricant around the seal. If a lubrication point appears dry, troubleshoot and repair the prob- lem. b. Start the truck engine. c. Actuate manual override switch (6, Figure 42-1). The hydraulic motor and grease pump must operate.