Lull 944E-42 Service Manual - Manual (Page 455)

8.203 Model 644E-42/944E-42 Rev. 6/04
Hydraulic System
3. Unlatch and open the engine cover. Allow the
hydraulic fluid to cool.
4. Label or otherwise mark the hydraulic hoses in
relation to the steer select manifold. Disconnect and
cap all hoses, fittings.
5. To remove the steer select valve, remove both the
lower and front dash panels. Refer to Section 4.5,
“Cab Removal.”
6. Remove the steer select valve from the dash. Refer
to refer to Section 4.3.4, “Steer Select Valve,” for
information on removing the steer select valve.
b. Steer Select 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. Place the steer select valve (2) on a suitable work
surface.
2. Transfer the elbow (3) to the “T” port on the side of
the new steer select valve.
3. Transfer the straight connectors (4) to the individual
ports on the bottom of the new steer select valve.
c. Steer Select Valve Installation
1. Reinstall the steer select valve into the dash. Refer
to Section 4.3.4, “Steer Select Valve,” for installation
procedures.
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 tube and 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. Steering Test
Refer to Section 8.7, “Hydraulic System Testing.”
1. Conduct a pressure check of the steering hydraulic
circuit at the accumulator charge/secondary function
valve.
2. Check each steering mode for proper function.
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.
MU3330
2
3
4
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.