Automatic Lubrication System - Section 42 OM4202 Page 42-14 PREVENTIVE MAINTENANCE PROCEDURES The following maintenance procedures should be used to insure proper system operation. 4. Inspect all bearing points for a bead of lubricant around the bearing seal. Daily Lubrication System Inspection It is good practice to manually lube each bear- ing point at the grease fitting (filler zerk, Figure 42-4) provided on each injector. This will indi- cate if there are any frozen or plugged bearings, and will help flush the bearings of contaminants. 1. Check grease reservoir level. Inspect grease level height after each shift of operation. Grease usage should be consistent from day-to-day operations.
5. System Checkout Lack of lubricant usage would indicate an inoperative system. a. Remove all SL-1 injector cover caps to allow visual inspection of the injector cycle indica- tor pins during system operation. Excessive usage would indicate a broken supply line. 2. Check all grease feed lines hoses from the SL-1 Injectors to the lubrication points (Figure 42-2). b. Lift the passenger seat and connect a jumper wire between the SOL terminal and the LUBE SW terminal on the 24VDC solid state timer (Figure 42-7). a. Repair or replace all worn / broken feed line hoses. c. Start engine. The hydraulic grease pump should operate. b.
Make sure that all air is purged and all new feed line hoses are filled with grease before sending the truck back into service. d. Keep the jumper wire connected until the pump stalls out at 13 790 kPa (2000 psi). 3. Inspect key lubrication points for a bead of lubri- cant around seal. e. With the pump in the stalled-out mode, check each SL-1 injector assembly. The cycle indi- cator pin should be retracted inside the injec- tor body. Make note of all lubrication points that look dry. Notify maintenance staff for repair service. f. Once all of the SL-1 injectors have been inspected under pressure, remove the jumper wire between the SOL terminal and LUBE SW terminal on the timer assembly.
The pump should shut off, and the system should vent back to the grease reservoir, and the pressure should drop to zero. 250 Hour Inspection 1. Check all grease feed line hoses from the SL-1 Injectors to the lubrication points (Figure 42-2). a. Repair or replace all worn / broken feed line hoses. b. Make sure that all air is purged and all new feed line hoses are filled with grease before sending the truck back into service. g. With the system vented, check all of the SL-1 injector indicator pins. All of the pins should be visible. 2. Check all grease supply line hoses from the pump to the SL-1 injectors. NOTE:
Refer to the system troubleshooting chart, if the injectors are not working properly. Replace or repair injectors, if defective. a. Repair or replace all worn / broken supply lines. h. Reinstall all injector cover caps. b. Make sure that all air is purged and all new supply line hoses are filled with grease before sending the truck back into service. i. Check timer operation. With the engine run- ning, the lube system should activate within 5 minutes. The system should build 13 790 kPa (2000 psi) within 25-40 seconds. If the system is working properly, the machine is ready for operation. If the system is malfunc- tioning, refer to the troubleshooting chart in the service manual. 3.
Check grease reservoir level. a. Fill reservoir if low. b. Check 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.