JLG 110HX ANSI Service Manual - Manual (Page 46)

SECTION 2 - PROCEDURES
2-22 – JLG Lift – 3120636
Assembly
NOTE: Prior to cylinder assembly, ensure that the proper
cylinder seal kit is used. See your JLG Parts Manual.


Apply a light film of hydraulic oil to all components
prior to assembly.
WHEN INSTALLING NEW “POLY-PAK” TYPE PISTON SEALS,
ENSURE SEALS ARE INSTALLED PROPERLY. REFER TO FIGURE
2-8., POLY-PAK SEAL INSTALLATION FOR CORRECT SEAL ORI-
ENTATION. IMPROPER SEAL INSTALLATION COULD RESULT IN
CYLINDER LEAKAGE AND IMPROPER CYLINDER OPERATION.
1. Place a new wiper seal and rod seal into the applica-
ble cylinder head gland grooves.
2. Carefully install the head gland on the rod, ensuring
that the wiper and rod seals are not damaged or dis-
lodged. Push the head along the rod to the rod end,
as applicable.
3. Carefully slide the piston spacer on the rod. If appli-
cable, align the oil holes in the rod and the spacer.
Secure the spacer, if applicable.
4. If applicable, correctly place a new o-ring and back-
up rings in the inner piston diameter groove.
5. Carefully place the piston on the cylinder rod, ensur-
ing that the o-ring and back-up rings are not dam-
aged or dislodged.
6. Using suitable protection, clamp the cylinder rod in
a vise or similar holding fixture as close to the piston
as possible.
7. Push the piston onto the rod until it abuts the spacer
end and install the attaching nut.
IF CYLINDER IS EQUIPPED WITH A PISTON NUT, APPLY “LOC-
QUIC PRIMER T” AND LOCTITE #242 TO PISTON NUT THREADS,
THEN TIGHTEN NUT TO TORQUE SHOWN IN TABLE 2-2, CYLIN-
DER PISTON NUT TORQUE SPECIFICATIONS.
NOTE: Self-locking setscrews used on piston nuts should be
discarded and replaced whenever they are removed.
8. If applicable, torque the piston nut to the proper
torque as outlined in Table 2-2. Spot drill the piston
rod at the point where the setscrew is inserted into
the piston nut. Install the setscrew(s) which secure
the piston attaching nut to the diameter groove.
9. Remove the cylinder rod from the holding fixture.
10. Place new o-rings and seals in the applicable out-
side diameter grooves of both the piston and the cyl-
inder head.
11. 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.
12. With barrel clamped securely, and while adequately
supporting the rod, insert the piston end into the
barrel cylinder. Ensure that the piston loading o-ring
and seal ring are not damaged or dislodged.
Figure 2-8. Poly-Pak Seal Installation
Table 2-2.Cylinder Piston Nut Torque Specifications.
Description
Nut
Torque Value
(Wet)
Setscrew
Torque Value
(Dry)
Lift Cylinder 600 ft. lbs.
(814 Nm)
200 in. lbs.
(22.5 Nm)
Slave Cylinder 80 ft. lbs.
(109 Nm)
100 in. lbs.
(12 Nm)
Master Cylinder 80 ft. lbs.
(109 Nm)
100 in. lbs.
(12 Nm)
Steer Cylinder 80 ft. lbs.
(109 Nm)
100 in. lbs.
(12 Nm)
Telescope Cylinder 600 ft. lbs.
(814 Nm)
100 in. lbs.
(12 Nm)
Axle Extension Cylinder 80 ft. lbs.
(109 Nm)
100 in. lbs.
(12 Nm)
Axle Lift Cylinder 400 ft. lbs.
(553 Nm)
100 in. lbs.
(12 Nm)
Extend - A - Reach
Lift Cylinder 400 ft. lbs.
(553 Nm)
100 in. lbs.
(12 Nm)
Slave Cylinder 200 ft. lbs.
(271 Nm)
100 in. lbs.
(12 Nm)