P3-8 Automatic Lubrication System P03022
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 (4, Figure 3-6) and fill housing to bottom of
plug hole.
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 (3, Figure 3-6) installed on
the manifold and should be checked occasionally to
verify pressure is within the above limits.
Pressure Control Valve Adjustment
1. With the truck engine running, actuate the man-
ual override (2, Figure 3-6) to start the hydraulic
motor and grease pump.
2. Loosen the locknut on the pressure control (1,
Figure 3-6) 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.)
Note: This is the minimum pressure setting, which is
about 170 psi (1 172 kPa).
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 (3).
5. Tighten the locknut to lock the stem in position.
Note: The flow control valve (5) is factory adjusted to
2.5 GPM (9.5 L/min.). Do not change this setting.
FIGURE 3-6. PUMP CONTROLS
1. Pump Pressure Control
2. Manual Override Knob
3. Pressure Gauge
4. Oil Level Plug
5. Flow Control Valve
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