SkyTrak 8042 Service Manual - Manual (Page 514)

8.99 Model 8042, 10042, 10054 Legacy Rev. 10/03
Hydraulic System
a. Power Steering Valve Removal
1. Park the vehicle on a firm, level surface, fully retract
all hydraulic cylinders, ground the attachment (if
any), place the travel select lever in (N) NEUTRAL,
place the neutral lock lever in the (N) NEUTRAL
LOCK position, engage the park brake switch and
shut the engine OFF.
2. Place an Accident Prevention Tag on both the
ignition key switch and the steering wheel, stating
that the vehicle should not be operated. Refer to
Section 1.5, “Accident Prevention Tags.”
3. Unlock and open the rear door. Allow the hydraulic
fluid to cool.
4. To remove the power steering valve, remove the
right console panel from the front dash. Refer to
Section 4.5, “Cab Removal.”
5. Label or otherwise mark the hydraulic hoses (6)
connected to the power steering valve (7).
Disconnect the hoses and cap all hoses, fittings, etc.
Wipe up any hydraulic fluid spillage.
6. Refer to Section 4.3.2, “Steering Wheel, Column and
Shifter,” for information on removing the steering
column. The steering column and power steering
valve are mounted together. DO NOT attempt to
disassemble the steering valve.
b. Power Steering Valve Installation
Note: ALWAYS replace seals, o-rings, gaskets, etc.,
with new parts to help ensure proper sealing and
operation. Lubricate seals and o-rings with clean
hydraulic oil.
1. Install the steering column, connecting it to the
power steering valve.
2. Connect all the hydraulic hoses (6) to the power
steering valve (7).
3. Check the routing of all hoses, wiring and tubing for
sharp bends or interference with any rotating
members, and install tie wraps and/or protective
conduit as required. Tighten all hose clamps.
4. Start the engine and run at approximately 1/3-1/2
throttle for about one minute without moving the
vehicle or operating any hydraulic functions.
5. Inspect for leaks and check the level of the hydraulic
fluid in the reservoir. Shut the engine OFF.
Note: Check for leaks and repair as required before
continuing. Add hydraulic fluid to the reservoir as
needed.
6. Wipe up any hydraulic fluid spillage in, on, near and
around the vehicle, work area and tools.
c. Power Steering Test
Conduct a pressure check of the steering hydraulic
circuits at the secondary function manifold. Refer to
Section 8.7, “Hydraulic System Testing.”
WARNING:
Hot hydraulic fluid can
cause severe burns. Wait for hydraulic fluid to
cool before servicing any hydraulic component.
WARNING:
Escaping hydraulic fluid
under pressure can penetrate the skin, causing
death or serious injury. Relieve hydraulic
pressure before servicing any hydraulic
component.
WARNING:
Avoid prolonged engine
operation in closed areas with inadequate
ventilation. Failure to properly ventilate exhaust
fumes can result in death or serious injury.
WARNING:
Hydraulic oil leaking under
pressure can penetrate the skin and cause
severe personal injury. DO NOT use your hand
or any part of your body to check for hydraulic
leaks. When checking for hydraulic leaks, wear
safety glasses and gloves to help provide
protection from spraying hydraulic oil. Use a
piece of cardboard or paper to search for
leaks.
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