Jib Components; Jib Cylinder - Genie GR-20J Service Manual

Section 4 • Repair Procedures

Jib Components

3-1

Jib Cylinder

How to Remove the Jib 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.
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 Turn the key switch to platform control and pull
out the red Emergency Stop button to the on
position at both the ground and platform
controls.
Note: Rotate the red Emergency Stop button at
platform control one quarter turn in a clockwise
direction to restore the power supply. The red
Emergency Stop button returns automatically to
the out, or on position.
2 Raise the jib boom to a comfortable working
height and place blocks under the platform for
support. Lower the jib boom until the platform is
resting on the blocks.
3 Turn the key switch to off position and push in
the red Emergency Stop button to the off
position at both the ground and platform
controls.
4 - 10
c
4 Tag, disconnect and plug the jib cylinder
hydraulic hoses. Cap the fittings on the
cylinder.
5 Remove the pin retaining fasteners from the jib
cylinder rod-end pivot pin. Do not remove the
pin.
6 Remove the pin retaining fasteners from the jib
cylinder barrel-end pivot pin. Do not remove the
pin.
7 Attach a lifting strap from an overhead crane to
the lug on the rod-end of the jib cylinder.
8 Place a block across both sides of the jib boom
under the jib cylinder.
9 Use a soft metal drift to remove the barrel-end
pivot pin and rod-end pivot pin.
10 Carefully remove the jib cylinder from the
machine.
GR-20J • GR-26J
September 2016
a
b
a jib boom
b jib cylinder
c platform
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 jib cylinder
could become unbalanced and fall
if not properly supported when
removed from the machine.
Part No. 227656