Genie S-60 HC, Service Manual

Page: 134 / 461

4 - 28 S-60 • S-65 • S-60 TRAX • S-65 TRAX Part No. 147753
S-60 HC • S-60X • S-60XC
December 2013 Section 4 • Repair Procedures
4-3
Boom Lift Cylinder
The boom lift cylinder raises and lowers the boom.
The boom lift cylinder is equipped with
counterbalance valves to prevent movement in the
event of a hydraulic line failure.
How to Remove the 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 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 .
1 Raise the boom to a horizontal position.
2 Attach a 5 ton / 5000 kg overhead crane to the
boom at the platform end for support. Do not lift
the boom.
3 Support and secure both ends of the boom lift
cylinder to a second overhead crane or similar
lifting device.
4 Remove the pin retaining fastener from the
boom lift cylinder rod-end pivot pin. Use a soft
metal drift to remove the pin.
Crushing hazard. The boom will fall
if not properly supported when the
primary boom rod-end pivot pin is
removed.
BOOM COMPONENTS
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.