Terex Genie Z-40, Service And Repair Manual, Page: 51 / 287

June 2022 Service and Repair Manual
Primary Boom Components
Part No. 1268555GT Z ® -62/40 37
4-3 Pri mar y Boo m Lift C ylinde r 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 upper
secondary arm is above the compression
arms.
3 Place a block across both compression arms.
Lower the secondary boom until it just rest on
the block. Do not rest the entire weight of the
boom on the block.
4 Attach a 5 ton / 5000 kg overhead crane to
the primary boom for support.
5 Raise the primary boom with the overhead
crane slightly to take the pressure off the
primary boom lift cylinder pivot pins.
6 Support the rod end and the barrel end of the
primary boom lift cylinder with a second
overhead crane or similar lifting device.
7 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.
8 Remove the 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.
9 Place a support block across the upper arm
under the primary boom lift cylinder.
10 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.
11 Remove the primary boom lift cylinder barrel-
end pivot pin snap rings.
12 Use a soft metal drift to remove the 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.