Maintenance - Section 42 06/06 0M4206 Page 42-8 Automatic Lubrication System GENERAL INSTRUCTIONS LUBRICANT REQUIRED FOR SYSTEM LUBRICANT PUMP Grease requirements will depend on ambient tem- peratures encountered during truck operation: Pump Housing Oil Level Above 32°C (90°F) - Use NLGI No.2 multipurpose grease (MPG). The pump housing must be filled to the proper level with SAE 10W-30 motor oil. Oil level must be checked at 1000 hour intervals. To add oil, remove oil level plug (4, Figure 42-7) and fill housing to bot- tom of plug hole. -32° to 32°C (-25° to 90°F) - Use NLGI No. 1 multipurpose grease (MPG).
Below -32°C (-25°F) - Refer to local supplier for extreme cold weather lubricant requirements. Pump Pressure Control High pressure hydraulic fluid from the truck steering system is reduced to 2240 to 2413 kPa (325 to 350 psi) by the pressure reducing valve located on the manifold on top of the pump motor. This pressure can be read on the gauge installed on the manifold and must be checked occasionally to verify pressure is within the above limits. SYSTEM PRIMING The system must be full of grease and free of air pockets to function properly. After maintenance, if the primary or secondary lubrication lines were replaced, it will be necessary to prime the system to eject all entrapped air. 1.
Fill lubrication reservoir with lubricant, if neces- sary. 2. To purge air from the main supply line, remove the main supply line at outlet port (6, Figure 42- 7) and connect an external grease supply to the line. 3. Remove plugs from each injector group in sequence (right front, left front, and rear axle). 4. Using an external grease source, pump grease until grease appears at the group of injectors and re-install the pipe plug. Repeat for remain- ing injector groups. 5. Remove the caps from each injector and con- nect an external grease supply to the zerk on the injector and pump until grease appears at the far end of the individual grease hose or the joint being greased. FIGURE 42-7.
PUMP CONTROLS 1. Pump Pressure Control 2. Manifold 3. Pressure Gauge 4. Oil Level Plug 5. Flow Control Valve 6. Outlet Port 7. Manual Override