Lull 944E-42 Service Manual User Manual download pdf (Page 454)

100

101

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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