Lull 944E-42 Service Manual - Manual (Page 454)

Hydraulic System
8.202 Model 644E-42/944E-42 Rev. 6/04
c. 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. Reinstall the power steering valve into the dash.
Refer to the reassembly procedure in Section 4.3.3,
“Steering Column and Valve Replacement,” for
installation procedures.
1. Install the steering column, connecting it to the
power steering valve.
2. 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.
3. 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.
4. 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.
5. Wipe up any hydraulic fluid spillage in, on, near and
around the vehicle, work area and tools.
d. Power Steering Test
Conduct a pressure check of the steering hydraulic
circuits at the accumulator charge/secondary function
valve. Refer to Section 8.7, “Hydraulic System Testing.”
8.12.12 Steer Select Valve
With the steer select valve, the vehicle can be used in the
front-wheel, four-wheel or crab steering mode. The steer
select valve (1) controls the direction of hydraulic fluid
flow to the steering cylinders mounted on each axle. The
steer select valve (1) is located inside the front dash on
the upper left side.
The steer select valve (1) is not serviceable and must be
replaced if defective.
a. Steer Select Manifold and 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 the [N]
NEUTRAL DETENT position, engage the park brake
switch and shut the engine OFF.
2. Place an Accident Prevention Tag on both the
ignition switch and the steering wheel, stating that
the vehicle should not be operated. Refer to Section
1.5, “Accident Prevention Tag Usage.”
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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