Terex Genie Z-40, Service And Repair Manual

Page: 55 / 287

June 2022 Service and Repair Manual
Secondary Boom Components
Part No. 1268555GT Z ® -62/40 41
5-1 Sec ond ary Bo om Lift Cylin der 5-1
Secondary Boom Lift Cylinder
There is one secondary boom lift cylinder
incorporated in the structure of the secondary
boom assembly. This cylinder requires hydraulic
pressure to extend and retract. The secondary
boom lift cylinder is equipped with counterbalance
valves to prevent movement in the event of a
hydraulic line failure.
How to Remove the Secondary
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 secondary boom until the rod end
pivot pins of the secondary lift cylinder clear
the lower tension arms.
2 Attach a lifting strap from an overhead
supporting device (5 ton / 5000 kg) to the
pivot end of the primary boom for support. Do
not apply lifting pressure.
Crushing hazard. The boom
assembly can fall if not properly
supported by the overhead
crane.
Component damage hazard.
Hoses and cables can be
damaged if they are kinked or
pinched.
3 Remove the pin retaining fasteners securing
the barrel-end pivot pins of the secondary
boom lift cylinder. Do not remove the pins.
4 Attach a strap from an overhead supporting
device to the center of the secondary boom lift
cylinder for support. Do not apply lifting
pressure.
Crushing hazard. The secondary
boom lift cylinder could become
unbalanced and fall when
removed from the machine if not
properly attached to the suitable
lifting device.
5 Use a slide hammer to remove the pivot pins.
6 Use auxiliary power to retract the cylinder.
7 Tag, disconnect and plug the hydraulic hoses
from the secondary boom lift cylinder. 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 Lower the cylinder onto the lower
compression arm.