Genie Z-30/20N Service And Repair Manual page 46

Service and Repair Manual
Secondary Boom Components
14 Remove the primary boom extend drive speed
limit switch (LS1) mounted on the side of the
primary boom at the pivot end. Do not
disconnect the wiring.
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.
Hoses and cables 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.
36 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 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.
28 Position a lifting strap from an overhead crane
at the center of the control box side upper
secondary compression arm.
September 2015
Part No. 1268498