Lull 944E-42 Service Manual - Manual (Page 446)

Hydraulic System
8.194 Model 644E-42/944E-42 Rev. 6/04
c. Auxiliary Hydraulic Pressure Release Valve
Installation
1. Position the auxiliary hydraulic pressure release
valve (1) back onto the bracket (2) on the pilot select
valve located on the valve plate (3).
2. Insert the two capscrews (14) and washers (5)
through the auxiliary hydraulic pressure release
valve (1) and secure to the bracket (2). Torque the
two capscrews to 5-9 lb-ft (7-12,5 Nm).
3. Reattach and secure all hoses (6) and fittings
according to their previously marked positions.
4. Reconnect the wire harness connector (7).
5. 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.
6. Inspect the pilot select valve 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.
7. Wipe up any hydraulic fluid spillage in, on, near and
around the vehicle, work area and tools.
8. Reinstall the access plate (8) to the cab floor. Secure
in place with the capscrews (9). Torque the
capscrews to 18 lb-ft (25 Nm).
d. Auxiliary Hydraulic Pressure Release Valve Test
Conduct a pressure check of the auxiliary hydraulic
pressure release valve circuit. Refer to Section 8.7,
“Hydraulic System Testing.”
WARNING:
Avoid prolonged engine
operation in closed areas with inadequate
ventilation. Failure to properly ventilate exhaust
fumes can result in death or serious injury.
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MU5850
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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.
MU3770
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