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Removal
NOTE: Clean steering control unit and surrounding
area carefully to help avoid contamination of hydraulic
oil when lines are opened.
1. Shut down engine and bleed down steering circuit.
NOTE: To insure the hydraulic oil has completely
drained from the accumulators, turn the steering
wheel. If the wheels do not turn, all the hydraulic
pressure has been drained from accumulators.
2. Disconnect hydraulic lines. Plug lines securely to
prevent spillage and possible contamination to
the system. Tag each line as removed for proper
identification during installation.
Take care to avoid contact with hot oil if truck has
been operating. Avoid spillage and contamination.
3. Remove capscrews (3, Figure 5-1) from steering
unit mounting bracket and remove valve assem-
bly.
Installation
1. Align steering control unit assembly with drive
coupling (6, Figure 5-1) and holes in mounting
bracket (2).
2. Install capscrews (3) and lockwashers (4). Tighten
capscrews to standard torque.
3. Turn steering wheel to several different positioins
and release to assure that springs in control valve
FREELY return the steering wheel to neutral. If
wheel is tight, loosen control unit mounting cap-
screws and realin valve.
4. Grease drive coupling through grease fitting (7)
with a molybdenum disulphide or multi-purpose
NLGI grease.
5. Remove plugs from four hydraulic lines. Be certain
that the previously tagged hydraulic lines are
connected to their respective ports according to
the markings on the steering control valve
assembly. (See Figure 5-2 & 5-3)
L05021
STEERING CONTROL UNIT
1. Steering Column
2. Mounting Bracket
3. Capscrew
Serious personal injury to the Operator or to any-
one positioned near the front wheels may occur if
a truck is operated with the hydraulic steering lines
improperly installed. Improperly installed lines
can result in uncontrolled steering and/or SUD-
DEN AND RAPID rotation of the steering wheel as
soon as the steering wheel is moved. It will turn
rapidly and cannot be stopped manually.
After servicing the steering control assembly, hy-
draulic steering lines should be checked for cor-
rect hook-up before starting the engine.
Steering Control Unit
FIGURE 5-1. STEERING CONTROL UNIT
INSTALLATION
4. Lockwasher
5. Steering Control Unit
6. Coupling
7. Grease Fitting
L5-1
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Troubleshooting
