Genie Z-51/30J Service And Repair Manual page 50

Service and Repair Manual
Secondary Boom Components
10 Remove the pin retaining fasteners from both
sides of the secondary boom lift cylinder rod-
end pivot pin and barrel-end pivot pin. Do not
remove the pins.
11 Attach a strap from an overhead crane to the
lug on the rod end of one of the secondary
boom lift cylinders for support. Do not apply any
lifting pressure.
12 Use a soft metal drift to drive the barrel-end
pivot pin half way out. Lower the barrel end of
the secondary boom lift cylinder and let it hang
down.
13 Use a soft metal drift to drive the rod-end pivot
pin half way out.
14 Remove the secondary boom lift cylinder from
the machine.
15 Repeat steps 11 through 14 for the other
secondary boom lift cylinder.
Crushing hazard. The secondary
WARNING
boom lift cylinder could become
unbalanced and fall when
removed from the machine if
not properly attached to the
overhead crane.
Component damage hazard.
NOTICE
When removing a secondary
boom lift cylinder from the
machine, be careful not to
damage the counterbalance
valve at the barrel end of the
cylinder.
16 Attach a lifting strap from an overhead crane to
the upper pivot for support. Do not lift it.
40
17 Attach a lifting strap from a second overhead
crane to the number 1 arm at the mid-point
between the upper pivot and mid-pivot.
18 Remove the pin retaining fasteners from the
number 1 arm pivot pins at the mid-pivot and
the upper pivot. Do not remove the pins.
19 Use a soft metal drift to drive both pins out.
20 Remove the number 1 arm from the machine.
WARNING
WARNING
21 Using the overhead crane attached to the
upper pivot, raise the secondary boom
assembly approximately 30 inches / 76 cm.
22 Insert a 4 x 4 x 11 inch / 10 x 10 x 28 cm block
between the number 2 arm and the boom rest.
Then lower the secondary boom assembly onto
the block.
WARNING
23 Pull all of the cables and hoses out through the
upper pivot.
NOTICE
Z®-51/31J
October 2020
Crushing hazard. The number 1
arm could become unbalanced
and fall when removed from the
machine if not properly attached
to the overhead crane.
Crushing hazard. The upper
pivot could fall when the
number 1 arm is removed from
the machine if not properly
supported by the overhead
crane.
Crushing hazard. The secondary
boom assembly could fall if not
properly supported by the 4 x 4 x
11 inch / 10 x 10 x 28 cm block.
Component damage hazard.
Cables and hoses can be
damaged if they are kinked or
pinched.
Part No. 1268553GT