Lull 944E-42, Service Manual

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8.249 Model 644E-42/944E-42 Rev. 6/04
Hydraulic System
18. If the bearing (17) requires replacement, support the
rod (6) in a soft-jawed vise or other suitable holding
device. Carefully press a new bearing into the rod
eyelet.
f. Swing Carriage Cylinder Installation
1. Install the swing carriage cylinder(s) (1) on the pivot
mount (18). Secure the rod ends to the pivot mount
using the shims (19) and bearings (20). Insert the
pin (21) and secure with the bolt (22) and nut (23).
2. Secure the tube end to the mount plates (24) using
the shims (25) and pins (26). Secure with snap
rings (27).
3. Lubricate the tube ends with multi-purpose lithium-
based grease.
4. Remove all plugs and caps from the hydraulic lines
and securely tighten the lines to the cylinder(s).
5. Start the engine.
6. Swing the carriage five times through its full range or
until the operation of the swing carriage is normal
(no jerks or spongy feel).
7. Shut the engine OFF. Check the hydraulic level and
fill as required.
g. Swing Carriage Cylinder Pressure Checking and
Circuit Bleeding
1. Attach a 5000 psi (345 bar) gauge to the main
control valve to test the swing carriage cylinder
hydraulic system circuit pressure. The unit is
equipped with test fittings from the factory. Refer to
Section 8.7, “Hydraulic System Testing.”
2. Center the swing carriage cylinders.
3. Swing the carriage fully left. Hold the joystick at full
swing left for several seconds, then swing the
carriage fully right and hold the joystick at full swing
right for several seconds.
4. Center the carriage.
5. Repeat Steps 3 thru 4 five times.
WARNING:
Escaping hydraulic fluid
under pressure can penetrate the skin, causing
death or serious injury.
MT1970
1
1
18
19
20
21
22
23
24
25
26
27
20
27
19
19
WARNING:
Avoid prolonged engine
operation in closed areas with inadequate
ventilation. Failure to properly ventilate exhaust
fumes can result in death or serious injury.