Lull 944E-42 Service Manual - Manual (Page 478)

Hydraulic System
8.226 Model 644E-42/944E-42 Rev. 6/04
4. Label or otherwise mark the lift/lower cylinder
hydraulic hoses. Disconnect and cap all hoses and
fittings.
5. Attach a sling to the lift/lower cylinder and to a hoist
or an overhead crane. Support the lift/lower cylinder
in the sling, and remove the nuts, capscrews and
cylinder mount pins from the cylinder. Refer to
Section 11.3.1, “Transfer Carriage Removal,” and
Section 3.3.3, “Outer Boom Replacement,” for
proper removal of the transfer carriage cylinder.
6. Safely and carefully, remove the lift/lower cylinder
from the vehicle. Wipe up any hydraulic fluid spillage
in, on, near and around the vehicle.
b. Lift/Lower Cylinder Disassembly
Note: An additional o-ring may be included at the base
of the cylinder rod. This additional o-ring may be
discarded, as it served only in a temporarily protective role.
1. Clean the lift/lower cylinder (1) with a suitable
cleaner. Remove all dirt, debris and grease from the
cylinder.
IMPORTANT: Avoid using excess force when clamping
the cylinder in a vise. Apply only enough force to hold the
cylinder securely. Excessive force can damage the cylin-
der tube (2).
2. Secure the lift/lower cylinder in a soft-jawed vise or
other acceptable holding equipment if possible.
MU3700
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WARNING:
Escaping hydraulic fluid
under pressure can penetrate the skin, causing
death or serious injury. Relieve hydraulic
pressure before servicing any hydraulic
component.
WARNING:
Significant pressure may be
trapped inside the cylinder. Exercise caution
when removing a counterbalance valve or a
pilot-operated check valve from a cylinder.
Escaping hydraulic fluid under pressure can
penetrate the skin, causing death or serious
injury.