7 - 20
Genie Z-30/20
Part No. 43063
Service Manual - Third Edition
Section 7 - Repair Procedures
4-2
Secondary Boom Lift Cylinder
The secondary boom lift cylinder raises and
lowers the secondary boom. The secondary
boom lift cylinder is equipped with a
counterbalance valve to prevent movement in the
event of a hydraulic line failure.
How to Remove the Secondary
Lift Cylinder
This procedure requires specific
repair skills, lifting equipment and
a suitable workshop. Attempting
this procedure without these skills
and tools may result in death or
serious injury and significant
component damage. Dealer
service is strongly recommended.
1 Lower the boom to the stowed position.
2 Remove all four turntable covers.
3 Tag, disconnect and plug the hydraulic hoses
from the secondary boom lift cylinder. Cap the
cylinder fittings.
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.
4 Secure the barrel end of the cylinder to the
secondary boom using a strap to prevent the
cylinder from falling when the pivot pin is
removed.
5 Attach a strap from an overhead crane to the
rod end of the secondary boom lift cylinder. Do
not lift it.
6 Remove the pin retaining fasteners from the
secondary boom lift cylinder barrel-end pivot
pin. Then use a soft metal drift to remove the
pin.
SECONDARY BOOM COMPONENTS
7 Remove the pin retaining fasteners from the
secondary boom lift cylinder rod-end pivot pin.
Then use a soft metal drift to remove the pin.
8 Remove the cylinder from the machine.
Component damage hazard. Be
sure not to damage the
counterbalance valve block on the
barrel end of the secondary boom
lift cylinder.
