Lift Cylinders; How To Remove The Lift Cylinder - Gs-3384, Gs-3390 And Gs-4390 - Genie GS-3384 Service And Repair Manual

Service and Repair Manual
Scissor Components

3-5 Lift Cylinders

3-5
Lift Cylinders
The lift cylinders are double acting hydraulic
cylinders. The GS-3384, GS-3390 and
GS-4390 use one lift cylinder; the GS-5390 uses
two. Each lift cylinder is equipped with a
counterbalance valve to prevent movement in the
event of a hydraulic line failure.
How to R emove the Lift Cylinder - GS-3384, GS-3390 and GS-4390
How to Remove the Lift Cylinder -
GS-3384, GS-3390 and GS-4390
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.
42
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.
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.
GS-84 • GS-90
September 2016
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.
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.
Part No. 1272222