Lull 944E-42 Service Manual - Manual (Page 469)

8.217 Model 644E-42/944E-42 Rev. 6/04
Hydraulic System
f. Attachment Tilt Cylinder Installation
1. Attach a suitable sling to an overhead crane or other
suitable device and to the attachment tilt cylinder at
the eyelet or hook. Make sure the device used can
actually support the cylinder. Place the attachment
tilt cylinder in position within the gooseneck. Refer to
Section 3.6.6, “Attachment Tilt Cylinder Installation.”
Install the cylinder into the gooseneck.
2. Connect the attachment tilt cylinder hydraulic hoses
in relation to the labels or markings made during
removal.
3. 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.
4. Inspect for leaks and check the level of the hydraulic
fluid in the reservoir. Add hydraulic fluid to the
reservoir as needed. Shut the engine OFF.
5. Wipe up any hydraulic fluid spillage in, on, near and
around the vehicle, work area and tools.
6. Conduct a pressure check of the attachment tilt
cylinder hydraulic circuit and bleed the circuit as
outlined in the procedure that follows.
g. Attachment Tilt Cylinder Pressure Checking and
Circuit Bleeding
1. Attach a 5000 psi (345 bar) gauge to the main
control valve to test the attachment tilt cylinder
hydraulic system circuit pressure. The unit is
equipped with test fittings from the factory. Refer to
Section 8.7, “Hydraulic System Testing.”
2. With no accessory installed on the quick attach, start
with the lift/lower and attachment tilt cylinders fully
retracted.
3. Fully extend the attachment tilt cylinder. Hold the
attachment tilt joystick at full extend while fully
raising the lift/lower cylinder.
4. Fully retract the attachment tilt cylinder. Hold the
attachment tilt joystick at full retract while fully
retracting the lift/lower cylinder.
5. Repeat Steps 3 thru 4 five times.
8.14.5 Slave Cylinders
Each slave cylinder (24) is secured to the transfer
carriage and outer boom with cylinder mount pins,
capscrews and nuts.
a. Slave Cylinder Removal
1. Park the vehicle on a firm, level surface, fully retract
all hydraulic cylinders, then raise the boom to
approximately a 30-degree angle. Support the
boom. 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.
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.
WARNING:
Hot hydraulic fluid can
cause severe burns. Wait for hydraulic fluid to
cool before servicing any hydraulic component.
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