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July 2007
REV A
5-2
Secondary Boom Lift Cylinder
The secondary boom lift cylinder raises and
lowers the secondary boom. 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 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 Rotate the turntable to the side until the boom is
centered between the steer and non-steer tires.
2 Raise the primary boom to full height. Do not
extend it. Turn the machine off.
3 Attach a lifting strap from an overhead crane to
the lug on the rod-end of the secondary boom
lift cylinder.
Part No. 128267
SECONDARY BOOM COMPONENTS
4 Open the engine side turntable cover. Pull up on
the engine tray lock pin and swing the engine
tray out and away from the machine. Secure the
engine tray from moving.
5 Remove the pin retaining fasteners from the
secondary boom lift cylinder barrel-end pivot
pins.
6 Use a slide hammer to remove the barrel-end
pivot pins.
Note: Access the pins using the access holes
located in the bulkheads, one on each side.
7 Remove the pin retaining fasteners from the
secondary boom lift cylinder rod-end pivot pin.
Use a soft metal drift to remove the pin.
8 Carefully lower the cylinder down through the
secondary boom, just enough to access the
hydraulic hoses.
9 Tag, disconnect and plug the hydraulic hoses
from the secondary boom lift cylinder. Cap the
fittings on the cylinder.
10 Carefully remove the cylinder by raising it
through the top of the secondary boom using
the overhead crane.
Z-34/22 IC
Section 4 • Repair Procedures
Component damage hazard.
Hoses can be damaged if they are
kinked or pinched.
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 secondary
boom lift cylinder could become
unbalanced and fall when
removed from the machine if not
properly supported by the
overhead crane.
4 - 29
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