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SYSTEM COMPONENTS
Filter (21, Figure 3-2)
A filter assembly mounted on the grease reservoir
filters the grease prior to refilling the reservoir from the
shop supply. A bypass indicator alerts service person-
nel when the filter requires replacement.
Hydraulic Motor and Pump (3 & 8, Figure 3-1)
The rotary hydraulic pump is a fully hydraulically oper-
ated grease pump. An integrated pump control mani-
fold is incorporated with the motor to control input flow
and pressure.
Note: The pump crankcase oil level must be main-
tained to the level of the pipe plug port. If necessary,
refill with 10W-30 motor oil.
Hydraulic oil supply inlet pressure must not ex-
ceed 3000 psi (20 685 kPa). Exceeding the rated
pressure may result in damage to the system com-
ponents and personal injury.
Grease Reservoir (12, Figure 3-1)
The reservoir has an approximate capacity of 60 lbs.
(27 kg) of grease. When the grease supply is replen-
ished by filling the system at the service center, the
grease is passed through the filter to remove contami-
nants before it flows into the reservoir.
Pressure Reducing Valve (4, Figure 3-1)
The pressure reducing valve, located on the manifold
reduces the hydraulic supply pressure (from the truck
steering circuit) to a suitable operating pressure, [325-
350 psi (2 240-2 415 kPa)] for the hydraulic motor used
to drive the lubricant pump.
Flow Control Valve (9, Figure 3-1)
The flow control valve mounted on the manifold, con-
trols the amount of oil flow to the hydraulic motor.
The flow control valve has been factory adjusted
and the setting should not be disturbed.
Solenoid Valve (5, Figure 3-1)
The solenoid valve, when energized, allows oil to flow
to the hydraulic motor.
P03018 4/00
Vent Valve (6, Figure 3-1)
With the vent valve closed, the pump continues to
operate until maximum grease pressure is achieved.
As this occurs, the vent valve opens and allows the
grease pressure to drop to 0, so the injectors can
recharge for their next output cycle.
Lubrication Cycle Timer (1, Figure 3-4)
The solid state lubrication cycle timer provides a 24
VDC timed-interval signal to energize the solenoid
valve (5, Figure 3-1), providing oil flow to operate the
grease pump motor. This timer is mounted in the
Electrical Interface Cabinet.
Delay Timer (11, Figure 3-4)
The delay timer, located in the Electrical Interface
Cabinet, provides a one minute delay in the low pres-
sure warning lamp circuit to allow a normally operating
system to attain full grease system pressure without
activating the warning lamp. If the system fails to reach
2000 psi (13 789 kPa) within this time period, the timer
will apply 24VDC to several relays which will illuminate
the low pressure warning lamp in the overhead display.
An external 604K ohm resistor determines the delay
period.
Pump Cutoff Pressure Switch (N.O. 2500 psi [17
237 kPa]) (10, Figure 3-1)
This pressure switch de-energizes the pump solenoid
relay when the grease line pressure reaches the switch
pressure setting, turning off the motor and pump.
Grease Pressure Failure Switch (N.O. 2000 psi
[13 789 kPa]) (9, Figure 3-2)
This pressure switch monitors grease pressure in the
injector bank on the rear axle housing. If the proper
pressure is not sensed within 60 seconds (switch
contacts do not close), several relays energize, actu-
ating a warning lamp circuit to notify the operator a
problem exists in the the lube system.
Pressure Gauge (7, Figure 3-1)
The pressure gauge monitors hydraulic oil pressure to
the inlet of the hydraulic motor.
Injectors (24, Figure 3-2)
Each injector delivers a controlled amount of pressur-
ized lubricant to a designated lube point. Refer to
Figure 3-2 for locations.
Automatic Lubrication System
P3- 3
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Table of Contents
Troubleshooting
