Genie Z-30/20N, Service Manual

Page: 71 / 161

Part No. 139378 Z-30/20N • Z-30/20N RJ • Z-34/22 • Z-34/22N 4 - 21
June 2011 Section 4 • Repair Procedures
REV A PRIMARY BOOM COMPONENTS
1 Remove the counterweight cover.
2 Raise the secondary boom until the master
cylinder barrel-end pivot pin is above the
turntable counterweights.
3 Raise the primary boom until the master
cylinder rod-end pivot pin is accessible.
4 Attach an overhead crane to the pivot end of the
primary boom for support. Do not lift it.
5 Secure the upper secondary boom to the pivot
end of the primary boom with a strap (this will
prevent the upper secondary boom from falling
when the master cylinder barrel-end pivot pin is
removed from the cylinder).
6 Tag, disconnect and plug the master 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.
7 Attach a lifting strap from an overhead crane to
the lug on the rod end of the master cylinder,
then secure the strap to the primary boom (use
this strap to lower the master cylinder out of the
upper pivot).
8 Remove the pin retaining fastener from the
master cylinder rod-end pivot pin. Use a soft
metal drift to remove the pin.
9 Remove the pin retaining fastener from the
master cylinder barrel-end pivot pin. Use a soft
metal drift to remove the pin from the cylinder.
Do not remove the pin from the upper pivot.
Push the pin to one side, only far enough to
remove the cylinder. The pin should remain in
one side of the upper secondary boom and
upper pivot.
Crushing hazard. The upper
secondary boom and the upper
pivot could fall if the pivot pin is
completely removed.
10 Use the strap around the rod-end lug to lower
the cylinder out of the machine.