Service and Repair Manual
September 2016
Scissor Components
44
GS-84 • GS-90
Part No. 1272222
How t o R emove t he Lif t Cylinder - G S-5390
How to Remove the Lift Cylinder -
GS-5390
Bodily injury hazard. The
counterbalance valve in the lift
cylinder is factory set. Do not
attempt to adjust the
counterbalance valve. Attempting
to adjust the counterbalance
valve could result in death or
serious injury and significant
component damage. Dealer
service is strongly recommended.
Bodily injury hazard. This
procedure requires specific repair
skills, lifting equipment and a
suitable workshop. Attempting
this procedure without these skills
and tools could result in death or
serious injury and significant
component damage. Dealer
service is strongly recommended.
Note: When removing a hose assembly or fitting,
the O-ring (if equipped) on the fitting and/or hose
end must be replaced. All connections must be
torqued to specification during installation. Refer to
Specifications,
Hydraulic Hose and Fitting Torque
Specifications.
1
Start the engine from the ground controls and
raise the platform approximately 18 feet /
5.5 m from the ground.
2
Release the safety arm latch, lift the safety
arm and rotate to a vertical position. Lock the
safety arm in position.
Note: Be sure that the safety arm is locked in the
vertical position.
3
Lower the platform onto the safety arm. Turn
the machine off.
Crushing hazard. Keep hands
clear of the safety arm when
lowering the platform.
Component damage hazard.
The link set cross tube can be
damaged if excessive force is
applied. Do not continue to lower
the platform after the safety arm
makes contact with the cross
tube.
4
Support the platform using a 5 ton / 5000 kg
overhead crane. Do not apply lifting pressure
at this time.
5
Tag, disconnect and plug the hydraulic hoses
from the lift cylinder. Cap the fittings on the
cylinder.
Bodily injury hazard. This
procedure requires specific repair
skills, lifting equipment and a
suitable workshop. Attempting
this procedure without these skills
and tools could result in death or
serious injury and significant
component damage. Dealer
service is strongly recommended.
6
Lower Lift Cylinder: Cut the zip ties attaching
the hydraulic hoses to the lift cylinder. Lay the
hoses out of the way.
Component damage hazard.
Hoses can be damaged if they
are kinked or pinched.
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