Lull 944E-42 Service Manual User Manual download pdf (Page 453)

100

101

8.201

Model 644E-42/944E-42 Rev. 6/04

Hydraulic System

8.12.11 Power Steering Valve

The power steering valve (2) is located at the base of the

steering wheel shaft, concealed by the lower dash cover.

The valve is not serviceable and must be replaced in its

entirety if defective.

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 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.”

3. Unlatch and open the engine cover. Allow the

hydraulic fluid to cool.

4. To remove the power steering valve, remove both the

lower and front dash panels. Refer to Section 4.5,

“Cab Removal.”

5. Remove the power steering valve from the dash.

Refer to Section 4.3.3, “Steering Column and Valve

Replacement,” 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 Reassembly

Note: Use new oiled o-rings as required. 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.

Note: Torque all the fittings as specified in Section 2.3,

“Torques.”

1. Transfer the fittings to the new power steering valve

(3). Note the orientation of each fitting before

removing them.

2. Transfer the elbow (4) to the “LS” port on the side of

the new power steering valve.

3. Transfer the check valve fitting (5) to the “P” port on

the front side of the new power steering valve.

4. Transfer the straight fitting (6) to the “R” port on the

front side of the new power steering valve.

5. Transfer the elbow (7) to the “T” port on the front side

of the new power steering valve.

6. Transfer the elbow (8) to the “L” port on the front side

of the new power steering valve.

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.

MU3170

MU3250

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