Genie Z-51/30J, Service And Repair Manual

Page: 53 / 144

October 2020
Part No. 1268553GT Z®-51/ 31J 43
Service and Repair Manual
54 Remove the number 3 arm from the machine.
WARNING
Crushing hazard. The number 3
arm could become unbalanced
and fall when removed from
the machine if not properly
supported by the overhead
crane.
55 Remove the upper and lower hose and cable
covers from the number 3 arm.
56 Remove the secondary boom drive speed limit
switch mounting fasteners from the number 4
arm at the mid-pivot end. Do not disconnect the
wiring.
57 Remove the pin retaining fasteners from the
number 4 arm at the turntable riser. Do not
remove the pin.
58 Attach a lifting strap from the overhead crane
to the center point of the number 4 arm. Do not
lift it.
59 Use a slide hammer to remove the number 4
arm from the turntable riser through the ground
controls side bulkhead.
60 Remove the number 4 arm from the machine.
WARNING
Crushing hazard. The number 4
arm could become unbalanced
and fall when removed from
the machine if not properly
supported by the overhead
crane.
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
WARNING
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.
Secondary Boom Components