July 2021
Service and Repair Manual
Secondary Boom Components
Part No. 1312350GT
Z
®
-45/25 • Z
®
-45/25J
49
5-2
Secondary Boom Lift Cylinder
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 the Secondary
Boom Lift Cylinder
Bodily injury hazard. 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.
Note: When removing a hose assembly or fitting,
the O-ring (if equipped) on the fitting and/or hose
end must be replaced. All connections must be
torqued to specification during installation. Refer to
Specifications,
Hydraulic Hose and Fitting Torque
Specifications.
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.
3 Tag, disconnect and plug the hydraulic hoses
on the secondary boom lift cylinder.
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.
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 suitable lifting device 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.
Crushing hazard. The secondary
boom lift cylinder could become
unbalanced and fall when
removed from the machine if not
properly attached to the suitable
lifting device.
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.
Содержание Genie Z-45/25 Bi-Energy
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