Genie Z-30/20N Service Manual page 74

Section 4 • Repair Procedures
SECONDARY BOOM COMPONENTS
15 Attach a lifting strap from an overhead crane to
the pivot end of the primary boom.
16 Carefully lift the secondary and primary boom
assembly with the overhead crane until the
master cylinder and primary boom lift cylinder
hydraulic hoses are accessible.
17 Remove the cable covers from the top of the
upper secondary boom.
18 Tag, disconnect and plug the primary boom lift
cylinder and master cylinder hydraulic hoses.
Cap the fittings on the cylinders.
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.
19 Lower the secondary boom to the fully stowed
position.
20 Pull all the cables and hoses through the upper
pivot.
Component damage hazard.
Cables and hoses can be
damaged if they are kinked or
pinched.
21 Position a lifting strap from the overhead crane
approximately 2 feet / 60 cm from the platform
end of the primary boom. Measure from the
platform end of the primary boom tube.
4 - 24 Z-30/20N • Z-30/20N RJ • Z-34/22 • Z-34/22N
22 Remove the pin retaining fasteners from the
upper pivot to upper secondary compression
arm pivot pins. Use a soft metal drift to remove
the pins.
23 Swing the compression arms down and out of
the way. Secure them from moving.
24 Remove the pin retaining fasteners from the
upper pivot to the upper secondary boom pivot
pin. Use a soft metal drift to remove the pin.
25 Carefully remove the entire primary boom
assembly from the machine (primary boom
assembly, jib boom assembly, platform, master
cylinder, primary lift cylinder and upper pivot).
Crushing hazard. The primary
boom assembly could become
unbalanced and fall when
removed from the machine if not
properly supported by the
overhead crane. Do not remove
the assembly from the machine
until it is properly balanced.
Note: During removal, the overhead crane strap
will need to be carefully adjusted for proper
balancing.
26 Place the entire assembly onto a structure
capable of supporting it.
27 Remove the pin retaining fasteners from the
upper secondary compression arm pivot pins.
Do not remove the pins.
June 2011
REV A
Part No. 139378