Primary Boom Extension Cylinder - Genie ZX-135/70 Service Manual

Service Manual
Boom Components
4-6
Primary Boom Extension
Cylinder
The primary boom extension cylinder extends and
retracts the primary boom extension tube.The
primary boom extension cylinder is equipped with
counterbalance valves to prevent movement in the
event of a hydraulic line failure.
How to Remove the Primary
Boom Extension 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.
Note: Perform this procedure with the machine on
a firm, level surface and in the stowed position with
the axles extended.
1 Extend the primary boom until the primary
boom extension cylinder rod-end pivot pin is
accessible in the primary boom extension
tube.
138
2 Remove the access cover from the pivot end
of the primary boom.
3 Tag, disconnect and plug the primary boom
extension cylinder hydraulic hoses. Cap the
fittings on the cylinder.
4 At the platform end, remove the external snap
rings from the extension cylinder rod-end pivot
pin. Use a soft metal drift to remove the pin.
5 Remove the extension cylinder retainers from
the saddle blocks.
6 Attach a lifting strap from an overhead crane
to the barrel end of the primary boom
extension cylinder.
7 Using the overhead crane, lift the extension
cylinder to clear the saddle blocks.
8 Support and slide the primary boom extension
cylinder out of the primary boom and place it
on a structure capable of supporting it.
Note: During removal, the overhead crane strap
will need to be adjusted for proper balancing.
Note: Note the length of the cylinder after removal.
The cylinder must be at the same length for
installation.
ZX-135/70
August 2014
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
extension cylinder could
become unbalanced and fall
when removed from primary
boom extension tube if not
properly supported.
Part No. 218700