P03022 Automatic Lubrication System P3-7
GENERAL INSTRUCTIONS
LUBRICANT REQUIRED FOR SYSTEM
Grease requirements will depend on ambient tem-
peratures encountered during truck operation:
• Above 90°F (32°C) - Use NLGI No.2
multipurpose grease (MPG).
• -25° to 90°F (-32° to 32°C) - Use NLGI No. 1
multipurpose grease (MPG).
• Below -25°F (-32°C) - Refer to local supplier for
extreme cold weather lubricant requirements.
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 lube reservoir with lubricant, if necessary.
2. To purge air from the main supply line, remove
the main supply line (2, Figure 3-1) at the pump
outlet port and connect an external grease sup-
ply to the line.
3. Remove plugs from each injector group in
sequence (right front, left front, and rear axle).
4. Using the 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.
FILTER ASSEMBLY
The filter assembly (21, Figure 3-2) element should
be replaced if the bypass indicator shows excessive
element restriction. See Figure 3-5 for detailed infor-
mation about the filter assembly.
FIGURE 3-5. FILTER ASSEMBLY
1. Housing
2. Bypass Indicator
3. O-Ring
4. Backup Ring
5. Element
6. Spring
7. Bowl
8. O-Ring
9. Plug
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