JLG 1500SJ Service Manual - Manual (Page 366)

SECTION 5 - HYDRAULICS
5-14 – JLG Lift – 3121262
12. Remove the cylinder rod from the holding fixture.
WHEN INSTALLING HYDROLOCK PISTON SEALS, ENSURE SEALS
ARE INSTALLED PROPERLY. REFER TO HYDROLOCK PISTON
SEAL INSTALLATION FOR CORRECT SEAL ORIENTATION.
IMPROPER SEAL INSTALLATION COULD RESULT IN CYLINDER
LEAKAGE AND IMPROPER CYLINDER OPERATION.
13. Place new hydrolock seals in the outer piston diam-
eter grooves. (A tube, with I.D. slightly larger than
the O.D.of the piston is recommended to install the
seal.)
14. Position the cylinder barrel in a suitable holding fix-
ture.
EXTREME CARE SHOULD BE TAKEN WHEN INSTALLING THE CYL-
INDER ROD, HEAD, AND PISTON. AVOID PULLING THE ROD OFF-
CENTER, WHICH COULD CAUSE DAMAGE TO THE PISTON AND
CYLINDER BARREL SURFACES.
15. With barrel clamped securely, and while adequately
supporting the rod, insert the piston end into the
barrel cylinder. Ensure that the piston seals are not
damaged or dislodged.
16. Continue pushing the rod into the barrel until the cyl-
inder head gland can be inserted into the barrel cyl-
inder.
17. Secure the cylinder head gland using the washer
ring, JLG Threadlocker (P/N 0100011), and socket
head bolts. Torque to 85 ft.lbs. (115 Nm)
18. After the cylinder has been reassembled, the rod
should be pushed all the way in (fully retracted) prior
to the reinstallation of any valves.
19. Install the counterbalance valves in the rod port
block. Torque 30-35 ft.lbs. (41-47 Nm).
20. If removed, install the bleeder valve. Torque 12 to 15
ft.lbs. (16 to 20 Nm)
Figure 5-27. Hydrolock Piston Seal Installation
Figure 5-28. Piston Seal Installation
Figure 5-29. Rod Assembly Installation