Lull 944E-42 Service Manual User Manual download pdf (Page 451)

100

101

8.199

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

Hydraulic System

b. Service Brake 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 brake valve. Note the

orientation of each fitting before removing them.

2. Transfer the tee fitting (1) to the “T” port on the side

of the new brake valve.

3. Transfer the tee fitting with diagnostic nipple (2) to

the upper “A” port on the side of the new brake valve.

Tighten securely.

4. Transfer the tee fitting with elbow and diagnostic

nipple (3) to the lower “A” port on the side of the new

brake valve. Tighten securely.

5. Transfer the double elbow (4) to the upper pressure

port “P” on the side of the new brake valve. Tighten

securely.

6. Transfer the double elbow (5) to the lower pressure

port “P” on the side of the new brake valve. Tighten

securely.

c. Service Brake Valve Installation

1. Reinstall the brake valve into the dash. Refer to the

reassembly procedure in Section 4.3.5, “Brake Valve

and Service Brake Pedal,” for installation

procedures.

2. Start the engine and run at approximately one-third

to one-half throttle for about one minute without

moving the vehicle or operating any hydraulic

functions.

3. Inspect the service brake valve and connections 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.

4. Wipe up any hydraulic fluid spillage in, on, near and

around the vehicle, work area and tools.

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: Escaping hydraulic fluid

under pressure can penetrate the skin, causing

death or serious injury.

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