Relieving Gas Strut Cylinder Pressure - JLG LiftPod FT70 Operation, Safety, Service And Maintenance Manual

DUE TO GAS STRUT CYLINDER PRESSURE WITHIN THE MAST ASSEMBLY,
FULLY EXTEND THE MAST ON A SUITABLE WORK SURFACE THEREBY RELIEV-
ING MOST OF THE STRUT CYLINDER COMPRESSION BEFORE MAST DISASSEM-
BLY. FAILURE TO DO SO COULD RESULT IN INJURY OR DEATH.

Relieving Gas Strut Cylinder Pressure

The FT70 and FT140 mast assemblies are mechanically the same
inside. To help extend the mast assembly sections during opera-
tion, there are two gas strut cylinders mounted internally. When
the mast is fully retracted the gas struts are compressed. The fol-
lowing procedures must ALWAYS be performed before disas-
sembling the mast assembly.
1. Lay mast on a clean sturdy workbench large enough
to fully support the mast assembly.
2. FULLY extend the mast using the hex drive shaft in the
main drive gear at the top of the mast assembly.
3. With the mast FULLY extended most of the pressure
from both the mid and outer-mast gas strut cylinders
is relieved. However, both gas struts still have an inch
or two of compression before being fully released.
Perform the following steps to relieve the outer and
mid-mast section gas strut cylinder pressure using the
gas strut mount removal tool (JLG P/N-1001181912).
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SECTION 6 - SERVICE/MAINTENANCE AND REPLACEMENT PARTS
a. Slide special tool into the bottom of the mid-mast
section to engage the outer to mid-mast section
gas strut cylinder rod mount - Item 10, Figure 6-1.
on page 6-9
b. Align the large screw on the end of the tool with
the large hole (arrow) in the lower end of the mid-
mast section. Thread the large screw in to engage
the hole. This will hold the tool in place on the
mast when relieving the pressure from the outer-
mast gas strut cylinder rod mount.
LIFTPOD by JLG 6-11