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LUBRICANT REQUIRED FOR SYSTEM
Grease requirements will depend on ambient tempera-
tures encountered during truck operation:
• Above 90°F (32°C) - Use NLGI No.2 multipur-
pose grease (MPG).
• -25° to 90°F (-32° to 32°C) - Use NLGI No. 1 mul-
tipurpose 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 reprime 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 at the Lincoln Lube canister
and connect an external grease supply to the line.
3. Remove plugs from each injector group in se-
quence (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 remaining in-
jector groups.
5. Remove the caps from each injector and connect
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.
LUBRICANT PUMP
Pump Housing Oil Level
The pump housing must be filled to the proper level
with SAE 10W-30 motor oil. Oil level should be
checked at 1000 hour intervals. To add oil, remove
pipe plug (3, Figure 3-5) and fill housing to bottom of
plug hole.
P03018 4/00
GENERAL INSTRUCTIONS
Pump Pressure Control
High pressure hydraulic fluid from the truck steering
system is reduced to 325 to 350 psi (2 240 to 2 413
kPa) 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
should be checked occasionally to verify pressure is
within the above limits.
Pressure Control Valve Adjustment
Note: This is the minimum pressure setting, which is
about 170 psi (1 172 kPa).
Note: The flow control valve (4) is factory adjusted to
2.5 GPM (9.5 L/min.). Do not change this setting.
1. Pump Pressure Control
2. Pressure Gauge
Automatic Lubrication System
1. With the truck engine running, activate the lube
system manual test switch to start the hydraulic
motor and pump.
2. Loosen the locknut on the pressure control (1,
Figure 3-5) by turning the nut counterclockwise.
3. Turn the valve stem counterclockwise until it no
longer turns. (The valve stem will unscrew until it
reaches the stop - it will not come off.)
4. With the pump stalled against pressure, turn the
pressure control valve stem clockwise until 325
to 350 psi (2 240 to 2 413 kPa) is attained on the
manifold pressure gauge (2).
5. Tighten the locknut to lock the stem in position.
FIGURE 3-5. PUMP CONTROLS
3. Oil Level Plug
4. Flow Control Valve
P3- 7
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Troubleshooting
