REV B
Section 4 • Repair Procedures
June 2005
4 - 18
TMZ-34/19
Part No. 52075
4-2
Lift Cylinders
The primary boom lift cylinder raises and lowers
the primary boom. The primary boom lift cylinder is
equipped with a bi-directional solenoid valve to
prevent movement in the event of a hydraulic line
failure.
How to Remove the Primary
Boom Lift Cylinder
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.
Perform this procedure on a firm,
level surface.
1 Tag, disconnect and plug the hydraulic hoses
on the primary 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.
2 Tag and disconnect the wiring from the solenoid
valve on the cylinder.
3 Support the primary boom lift cylinder with an
overhead crane or similar lifting device.
4 Remove the pin retaining fastener from the
primary boom lift cylinder barrel-end pivot pin.
a
primary boom lift cylinder barrel-end pivot pin
b
primary boom lift cylinder
c
primary boom lift cylinder rod-end pivot pin
d
primary boom
e
secondary boom
a
b
d
c
e
5 Using a soft metal drift, remove the primary
boom lift cylinder barrel-end pivot pin.
Crushing hazard. The lift cylinder
will fall if not properly supported.
6 Lower the cylinder onto the secondary boom.
Component damage hazard. The
solenoid valve on the lift cylinder
can be damaged if allowed to
come in contact with the boom.
7 Remove the pin retaining fastener from the
primary boom lift cylinder rod-end pivot pin.
8 Using a soft metal drift, remove the primary
boom lift cylinder rod-end pivot pin.
Crushing hazard. The lift cylinder
will fall if not properly supported.
9 Carefully remove the cylinder from the machine.
Crushing hazard. The lift cylinder
could become unbalanced and fall
if not properly supported when
removed from the machine.
Component damage hazard. The
solenoid valve can be damaged.
Use caution when removing the
cylinder from the machine.
BOOM COMPONENTS
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