Genie Z-51/30J Service And Repair Manual page 40

Service and Repair Manual
Primary Boom Components
9 Tag, disconnect and plug the platform rotator
hydraulic hoses at the union located above the
primary boom lift cylinder. Cap the fittings on
the unions.
Bodily injury hazard. Spraying
WARNING
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
10 Tag, disconnect and plug the hydraulic hoses
from the platform leveling master cylinder. Cap
the fittings on the cylinder.
Bodily injury hazard. Spraying
WARNING
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
11 Raise the boom to a horizontal position.
12 Place blocks between the upper and lower
cable tracks and secure the upper and lower
tracks together.
Crushing hazard. If the upper
WARNING
and lower cable tracks are not
properly secured together,
the cable track could become
unbalanced and fall when
removed from the machine.
30
spray.
spray.
Z®-51/31J
13 Attach a lifting strap from an overhead 5 ton /
5,000 kg capacity crane to the platform end of
the primary boom for support. Do not lift it.
14 Remove all hose and cable clamps from the
underside of the primary boom.
15 Support the rod end of the primary boom lift
cylinder with a suitable lifting device.
16 Remove the pin retaining fasteners from the
primary boom lift cylinder rod-end pivot pin. Do
not remove the pin.
17 Raise the primary boom slightly with the
overhead crane to relieve the pressure on the
primary boom lift cylinder rod-end pivot pin.
18 Use a soft metal drift to remove the primary
boom lift cylinder rod-end pivot pin.
Crushing hazard. The primary
WARNING
boom lift cylinder could become
unbalanced and fall if not
properly supported by the lifting
device.
19 Lower the rod end of the primary boom lift
cylinder approximately 12 inches / 30 cm.
20 Pull all of the hoses and cables out and away
from the mounting ears for the rod end of the
primary boom lift cylinder.
21 Raise the rod end of the primary boom lift
cylinder back into position and install the rod-
end pivot pin. Install the pin retaining fasteners.
October 2020
Part No. 1268553GT