Primary Boom Extension Cylinder - Genie Z80/60 Service Manual

Section 4 • Repair Procedures
BOOM COMPONENTS
4-4
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 on the fitting and/or hose end must be
replaced and then torqued to specification during
installation. Refer to Section 2, Hydraulic Hose and
Fitting Torque Specifications.
1 Raise the primary boom to a horizontal position.
2 Extend the primary boom until the primary
boom extension cylinder rod-end pivot pin is
accessible.
3 Remove the access cover from the pivot end of
the primary boom.
4 - 38
4 Place blocks under the barrel end of the primary
boom extension cylinder for support.
5 Tag, disconnect and plug the primary boom
extension cylinder hydraulic hoses. Cap the
fittings on the 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.
6 Working at the platform end of the boom,
remove the external snap rings from the
extension cylinder rod-end pivot pin.
7 Use a soft metal drift to remove the pin.
Crushing hazard. The primary
boom could fall when removed
from the extension boom if not
properly supported.
8 Remove the barrel-end pivot pin retaining
fasteners.
9 Place a rod through the barrel-end pivot pin and
twist to remove the pin.
Z-80/60
June 2011
REV D
Part No. 88619