Genie Z-30/20N Service Manual page 68

Section 4 • Repair Procedures
SECONDARY BOOM COMPONENTS
40 Attach a lifting strap from an overhead crane to
the upper secondary boom.
41 Remove the pin retaining fastener from the
mid-pivot to upper secondary boom pivot pin.
Use a soft metal drift to remove the pin.
42 Remove the upper secondary boom with
compression link from the machine.
Crushing hazard. The upper
secondary boom with
compression link could become
unbalanced and fall when
removed from the machine if not
properly supported by the
overhead crane.
43 Remove the mounting fasteners from the
counterweight attached to the lower leveling
link.
44 Attach a lifting strap from an overhead crane to
the counterweight. Remove the counterweight
from the lower leveling link.
Tip-over hazard. The
counterweight is critical to
machine stability. If the
counterweight is not installed
during re-assembly of the
machine, the machine will become
unstable and tip over.
Crushing hazard. The
counterweight could become
unbalanced and fall when
removed from the machine if not
properly supported by the
overhead crane.
4 - 24
45 Remove the mounting fasteners from the
function manifold and slide the function
manifold to the side. This will allow access to
the secondary boom lift cylinder barrel-end
pivot pin.
46 Remove the mounting fasteners from the
auxiliary power unit. Do not disconnect the
electrical cables or hydraulic hoses.
47 Slide the auxiliary power unit to the side to
access the other secondary boom lift cylinder
barrel-end pivot pin.
48 Remove the retaining fasteners from the
secondary boom lift cylinder barrel-end pivot
pins.
49 Attach a lifting strap from an overhead crane to
the lug on the rod end of the secondary boom
lift cylinder.
50 Tag, disconnect and plug the hydraulic hoses
from the secondary boom lift cylinder. Cap the
fittings on the cylinder.
51 Use a slide hammer to remove the barrel-end
pivot pins (access the pins from the access
holes in the bulkheads, one on each side).
Remove the secondary boom lift cylinder from
the machine.
Genie Z-30/20N
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.
Part No. 106373
April 2005
REV B