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PS
S4.0
4150
001
OE35
Version no
T-code
F-code
Section
C-code
Steering System Pump
124
Service Manual
1997-10-29
1. General Information
A duplex pump powered by a single motor is used for the
power steering and the brake release. The upper pump is for
the power steering and the lower pump is for the brake
release. Each pump has a pressure relief valve. In addition,
the lower pump has a normally open hydraulic solenoid valve
to allow brake release pressure to bleed off so the brakes will
apply.
2. Removal
1. Drain hydraulic fluid from reservoir. The truck
hydraulics may be used to pump the fluid out of the
reservoir.
2. Disconnect battery.
3. Remove electrical wires from solenoid mounted on
pump body.
4. Remove hoses from pump.
5. Remove four bolts that mount the pump onto the
motor and lower the pump to separate it from
motor. Be careful to not lose the spider coupling.
POS.
NO
DESCRIPTION
POS.
NO
DESCRIPTION
POS.
NO
DESCRIPTION
1
Pump and motor
7
Gasket
13
Pump assembly
2
Motor
8
Pump, steering
14
Kit, coupler
3
Lockwasher
9
Pump and motor
15
Gasket
4
Screw, cap
10
Motor
16
Pump assembly
5
Pump assembly
11
Lockwasher
17
Coil
6
Kit, coupler
12
Screw, cap
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