Boom Extension Cylinders - Genie S-80 Service Manual

February 2012
5 Using auxiliary power, activate the boom down
function so the cylinder will retract. Retract the
cylinder just enough until the rod end of the
cylinder will clear the mounting bracket on the
boom. Turn the machine off.
6 Tag, disconnect and plug the boom lift 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.
7 Remove the pin retaining fasteners from the
boom lift cylinder barrel-end pivot pins. Do not
remove the pins.
8 Use a slide hammer to remove the barrel-end
pivot pins.
Crushing hazard. The boom lift
cylinder could become unbalanced
and fall if not properly supported
and secured to the lifting device.
9 Move the boom lift cylinder towards the
counterweight end of the machine. Rotate the
boom lift cylinder until the barrel-end pivot pin
bores will clear the boom linkage.
10 Carefully remove the boom lift cylinder from the
machine.
Crushing hazard. The boom lift
cylinder could become unbalanced
and fall if not properly supported
and secured to the lifting device.
Part No. 122985
4-4
Boom Extension Cylinder
The boom extension cylinder is located inside the
boom assembly and incorporates cables and
pulleys that are responsible for extending the
number 3 boom 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 Boom
Extension Cylinder
Note: When removing a hose assembly or fitting,
the O-ring (if equipped) on the fitting and/or the
hose end must be replaced. All connections must
be torqued to specification during installation.
Refer to Section 2, Hydraulic Hose and Fitting
Torque Specifications .
Note: Perform this procedure with the boom fully
retracted.
1 Raise the boom to a horizontal position.
S-80 • S-85 • S-80X
Section 4 • Repair Procedures
BOOM COMPONENTS
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.
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