Primary Boom Lift Cylinder - Genie Z-45 Service And Repair Manual

Service and Repair Manual
Primary Boom Components
4-3

Primary Boom Lift Cylinder

The primary boom lift cylinder raises and lowers
the primary boom. The primary boom lift cylinder is
equipped with a counterbalance valve to prevent
movement in the event of a hydraulic line failure.
How to Remove the Primary
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 hose
end must be replaced. All connections must be
torqued to specification during installation. Refer to
Specifications, Hydraulic Hose and Fitting Torque
Specifications.
1 Raise the primary boom to a horizontal
position.
2 Raise the secondary boom until the primary
boom lift cylinder barrel-end pivot pin is above
the turntable covers.
3 Attach a 5 ton / 5000 kg overhead crane to the
primary boom for support.
4 Raise the primary boom with the overhead
crane slightly to take the pressure off the
primary boom lift cylinder pivot pins.
5 Support the rod end and the barrel end of the
primary boom lift cylinder with a second
overhead crane or similar lifting device.
30 Z®-45/25 Bi-Energy • Z®-45/25J Bi-Energy
6 Tag, disconnect and plug the primary 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
primary boom lift cylinder rod-end pivot pin.
Use a soft metal drift to remove the pin.
Crushing hazard. The primary
boom will fall if not properly
supported when the primary
boom rod-end pivot pin is
removed.
8 Place a support block across both turntable
covers under the primary boom lift cylinder.
9 Lower the rod end of the lift cylinder onto the
block. Protect the cylinder rod from damage.
Crushing hazard. The primary
boom lift cylinder could become
unbalanced and fall if not
properly supported by the lifting
device.
10 Remove the primary boom lift cylinder
barrel-end pivot pin retaining fasteners. Do not
remove the pin.
11 Use a slide hammer to remove the barrel-end
pivot pin. Carefully remove the primary boom
lift cylinder from the machine.
Crushing hazard. The lift cylinder
could become unbalanced and
fall if not properly supported and
secured to the lifting device.
September 2016
Part No. 1268546GT