JLG 2658E3 ANSI Service Manual - Manual (Page 22)

SECTION 2 - PROCEDURES
2-10 – JLG Lift – 3120762
7. Using suitable protection, clamp the cylinder rod in
a vise or similar holding fixture as close to the piston
as possible.
8. Carefully thread the piston on the cylinder rod hand
tight, ensuring that the o-ring and back-up rings are
not damaged or dislodged.
9. Thread the piston onto the rod until it abuts the
spacer end and install the tapered bushing.
NOTE: When installing the tapered bushing, the piston and
mating end of the rod must be free of oil.
WHEN REBUILDING THE LIFT CYLINDER, APPLY LOCTITE #242
TO TA P E R E D B U S H I N G B O LT S , T H E N T I G H T E N B O LT S
SECURELY. REFER TO TABLE 2-1, CYLINDER COMPONENT
TORQUE SPECIFICATIONS FOR PROPER BOLT TORQUE VAL-
UES.
10. Install the bolts into the bushing using Loctite #242.
Refer to Cylinder Component Torque Specifications
Table for proper bolt torque values.
11. Remove the cylinder rod from the holding fixture.
12. Place new guidelock and hydrolock seals in the
applicable outside diameter grooves of both the pis-
ton and the cylinder head.
13. 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.
14. With the barrel clamped securely, and while ade-
quately supporting the rod, insert the piston end into
the cylinder barrel. Ensure that the piston loading o-
ring and seal ring are not damaged or dislodged.
15. Continue pushing the rod into the barrel until the cyl-
inder head gland can be inserted into the cylinder
barrel.
16. Secure the cylinder head gland using the washer
ring and socket head bolts. Refer to Table 2-1, Cylin-
der Component Torque Specifications for proper
bolt torque specifications.
Figure 2-10. Installation of Head Seal Kit
Figure 2-11. Piston Seal Kit Installation
Figure 2-12. Tapered Bushing Installation
Figure 2-13. Poly-Pak Piston Seal Installation