SECTION 2 - PROCEDURES
3120743
– JLG Lift –
2-25
12.
Push the piston onto the rod until it abuts the spacer
end and install the attaching locknut. (See Table 2-
1.)
WHEN REBUILDING THE LIFT CYLINDERS, APPLY LOCTITE 242
TO PISTON NUT AND SETSCREWS.
13.
Remove cylinder rod from the holding valve.
14.
Place new o-rings and seals in the applicable out-
side diameter grooves of both the piston and the cyl-
inder head.
15.
Position the cylinder barrel in a suitable holding fix-
ture.
EXTREME CARE SHOULD BE TAKEN WHEN INSTALLING THE
CYLINDER ROD, HEAD AND PISTON. AVOID PULLING THE ROD
OFF-CENTER, WHICH COULD CAUSE DAMAGE TO THE PISTON
AND CYLINDER BARREL SURFACES.
16.
With barrel clamped securely, and while adequately
supporting the rod, insert the piston end into the cyl-
inder barrel. Ensure that the piston loading o-ring
and seal ring are not damaged or dislodged.
NOTE:
These cylinders use setscrews which should be dis-
carded and replaced whenever they are removed.
17.
Continue pushing the rod into the barrel until the cyl-
inder head gland can be inserted into the barrel cyl-
inder or if applicable until the cylinder head threads
engage the barrel threads.
18.
If applicable, apply loctite #222 and secure the cyl-
inder head retainer using a suitable chain wrench.
NOTE:
Step (19) applies to the Steer Cylinder.
19.
Secure the cylinder head with retainer ring.
NOTE:
Step (20) applies to the Steer Cylinder.
20.
Insert the other cylinder head gland into the barrel
cylinder. Secure the cylinder head retainer using a
suitable chain wrench.
21.
After the cylinder has been reassembled, the rod
should be pushed all the way in (fully retracted) prior
to the reinstallation of any holding valves.
22.
If applicable, install the cartridge type holding valve
and fittings in the rod port block using new o-rings
as applicable. (See table 2-2 holding valve torque
specifications)
IF THE CYLINDER IS TO BE TESTED PRIOR TO INSTALLATION ON
THE MACHINE, EXTREME CARE SHOULD BE USED TO INSURE
THAT THE OUTER END OF THE ROD IS SUPPORTED. USE
EITHER A TRAVELING OVERHEAD HOIST, FORKLIFT, OR OTHER
MEANS TO SUPPORT THE OVERHANGING WEIGHT OF THE
EXTENDING ROD.
Figure 2-22. Installing Retainer Ring on
Telescope Cylinder Barrel.
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