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OM4006.2 10/98
Automatic Lube System
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. Remove plugs from all injector manifold dead ends
and supply lines.
NOTE: To run the grease pump when priming the lube
system, turn keyswitch "ON" and connect a jumper
wire between the "LUBE SW" and "SOL" terminals on
the solid state timer.
3. Run grease pump until grease flows from any one
plug opening in the system. Replace plug in this
opening.
4. Repeat step 3 until all lines are full and all plugs
replaced.
NOTE: Fill each feed line with grease before connect-
ing lines to the injector outlets and bearings. This will
prevent having to cycle the individual injectors once
for each 1.0 in. (25 mm) length of feed line between
the injector and bearing fitting.
System Checkout
To check system operation (not including timer), pro-
ceed as follows:
1. Turn Keyswitch (3, Figure 4-11) ''Off'' and shut
down engine to de-energize system.
Install a 5000 PSI (35 MPa) pressure test gauge in
the grease supply line (13, Figure 4-5).
2. Turn Keyswitch ''On'' and start engine to energize
system.
3. Lift the passenger seat, and connect a jumper wire
between the ''SOL'' and ''LUBE SW'' terminals on
the 24 VDC solid state lube timer.
Pump should operate.
NOTE: If terminal post identification on the solid state
timer is not legible, refer to Figure 4-11 for terminal
positions.
4. Keep jumper wire connected until the pump stalls.
5. Observe the 5000 PSI (35 MPa) pressure test
gauge in the grease supply line. Pressure should
be 2500 - 3000 PSI (17.2 - 20.7 MPa).
! WARNING !:
DO NOT EXCEED Maximum Pump
Pressure of 3500 p.s.i. (24.1 MPa).
Exceeding this value will damage components
and/or cause components to rupture, resulting in
possible serious injury to any nearby personnel.
If pressure is not correct, adjust the Pressure
Reducing Valve as necessary (refer to ''Pressure
Reducer Adjustment'').
NOTE: DO NOT EXCEED 300 PSI (2.1 MPa) on
the Cylinder Pressure gauge (2, Figure 4-5)
6. Disconnect jumper wire. System should vent.
7. Turn Keyswitch ''Off'' and shut down engine to
de-energize system.
Remove the 5000 PSI (35 MPa) pressure test
gauge previously installed. Re-connect system.
Pressure Reducer Adjustment
NOTE: Steering accumulator pressure is necessary to
power the lube system for this procedure.
While engine is running, and/or accumulators are
charged, exercise extreme care while working in
the vicinity of the grease pump!
Steering pressure is also available at this time.
Keep personnel away from front wheels to prevent
crushing!
Stay clear of moving engine parts and do not
loosen/disconnect any pressure fittings or hoses.
To set the Pressure Reducing Valve:
1. With keyswitch ''Off'', engine stopped, and steer-
ing accumulator pressure bled down, install a
5000 PSI (35 MPa) pressure test gauge in the
grease supply line (13, Figure 4-5).
2. At the truck Hydraulic Bleeddown Manifold, dis-
connect the Bleeddown Solenoid. (This will pre-
vent accumulators from bleeding down when
engine is shut down, later in step 4.)
3. Start the truck engine. When steering and brake
pressures have stabilized, pull the retarder lever
to the fully applied position to apply the brakes.
4. Turn keyswitch ''Off'' to completely stop engine.
Then return the keyswitch to the ''On'' position.
5. Lift the passenger seat, and connect a jumper wire
between the ''SOL'' and ''LUBE SW'' terminals on
the 24 VDC solid state lube timer.
Pump should operate. Keep jumper wire con-
nected until the pump stalls.
Maintenance - Section 4
Page 4-17
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