Tag and disconnect all the hydraulic lines to
the cylinder. Cap or plug all openings with high
Refer to Section 8 for lift cylinder
disassembly and assembly pro-cedures.
Maintenance not requiring removal of
Pull the lower lift cylinder pivot shaft out far
the cylinder barrels, such as packing,
enough to remove the cylinder.
may be performed without removing the
cylinders from the turntable. However,
Move the lift cylinder to a clean work area.
all disassembly and assembly should be
conducted in a clean dust-free area.
DISASSEMBLY AND ASSEMBLY.
Disassembly and assembly procedures of the lift
cylinder holding valve and control valve are provided
Extend and set the outriggers.
in Section 8 under CYLINDERS and VALVES,
Elevate the boom slightly so that the lift
cylinder is extended approximately one foot (0.3 m).
Attach an adequate lifting device to the lift
cylinder and position the cylinder over the attach
Ensure any blocking or cribbing used is
fittings on the turntable.
capable of supporting the boom.
Lower the lift cylinder into the attach fittings on
Ensure the boom is fully supported by placing
the turntable and align the lift cylinder bushing with
blocking or cribbing under the boom. Rest the boom
the attach fitting holes.
on the blocking or cribbing.
Install the lift cylinder lower pivot shaft and
Remove the bolt, washer, and plate securing
secure with the bolts and nuts. Torque the bolt to
the lift cylinder upper pivot shaft to the boom.
250 lbs-ft (338.9 Nm).
Remove the bolts and nuts securing the lift
Connect the extend and retract hoses to the lift
cylinder lower pivot shaft to the turntable.
Activate the crane's hydraulic system and align
the lift cylinder rod end with the attach point on the
Ensure the lifting/supporting device is
boom. Install the upper pivot shaft through the
capable of supporting the lift cylinder.
cylinder and boom attach points. Shut down the
Attach an adequate lifting/supporting device to
the lift cylinder being removed.
Secure the upper pivot shaft with the bolts,
washers, and plate. Torque the bolt to 75 lbs-ft
Remove the upper pivot shaft. Activate the
hydraulic system and retract the lift cylinder enough
to clear the upper attach point.
Remove the lifting and supporting devices from
the boom and lift cylinders. Activate the hydraulic
system and check the lift cylinders for proper
operation and any leaks.