Secondary Boom Lift Cylinders - Genie Z-45/25 Service Manual

First Edition • Second Printing
5-2

Secondary Boom Lift Cylinders

There are two secondary boom lift cylinders
incorporated in the structure of the secondary
boom assembly. These cylinders operate in
parallel and require hydraulic pressure to extend
and retract. Each secondary boom lift cylinder is
equipped with a counterbalance valve to prevent
movement in the event of a hydraulic line failure.
How to Remove a Secondary
Boom Lift Cylinder
This procedure requires specific
repair skills, lifting equipment and
a suitable workshop. Attempting
this procedure without these skills
and tools could result in death or
serious injury and significant
component damage. Dealer
service is strongly recommended.
1 Lower the secondary boom to the stowed
position.
2 Raise the primary boom so that it is above the
secondary boom lift cylinder rod-end pivot pin.
Part No. 52709
3 Tag, disconnect and plug the hydraulic hoses
on the secondary boom lift cylinder.
4 Remove the pin retaining fasteners from the
secondary boom lift cylinder rod-end pivot pin
and barrel-end pivot pin. Do not remove the
pins.
5 Attach a strap from an overhead crane to the
lug on the rod end of the secondary boom lift
cylinder for support. Do not apply any lifting
pressure.
6 Use a soft metal drift to drive the barrel-end
pivot pin half way out. Lower the barrel end of
the secondary boom lift cylinder and let it hang
down.
7 Use a soft metal drift to drive the rod-end pivot
pin half way out.
8 Remove the secondary boom lift cylinder from
the machine.
Genie Z-45/25 & Genie Z-45/25J
Section 7 • Repair Procedures
SECONDARY BOOM COMPONENTS
Bodily injury hazard. Spraying
hydraulic oil can penetrate and
burn skin. Loosen hydraulic
connections very slowly to allow
the oil pressure to dissipate
gradually. Do not allow oil to squirt
or spray.
Crushing hazard. The secondary
boom lift cylinder may become
unbalanced and fall when it is
removed from the machine if it is
not properly attached to the
overhead crane.
Component damage hazard.
When removing a secondary
boom lift cylinder from the
machine, be careful not to damage
the counterbalance valve at the
barrel end of the cylinder.
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