JLG 18RS Service Manual - Manual (Page 105)

SECTION 5 - HYDRAULICS
3121284 – JLG Lift – 5-15
13. Remove the cylinder rod from the holding fixture.
14. Place a new t-seal and wear rings in the outer piston
diameter grooves. (A tube, with I.D. slightly larger than
the O.D.of the piston is recommended to install the seal.)
15. Position the cylinder barrel in a suitable holding fixture.
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 sup-
porting the rod, insert the piston end into the barrel cyl-
inder. Ensure that the piston seals are not damaged or
dislodged.
17. Continue pushing the rod into the barrel until the cylin-
der head gland can be inserted into the barrel cylinder.
18. Secure the cylinder head gland and cylinder support
plate with JLG Threadlocker (P/N 0100011) and socket
head bolts. Torque to 20 ft.lbs. (25 Nm).
19. After the cylinder has been reassembled, the rod should
be pushed all the way in (fully retracted) prior to the
reinstallation of any valves.
20. Install the shuttle valve in the port block. Torque to 16
ft.lbs. (21 Nm).
21. Install the counterbalance valves in the port block.
Torque 50-55 ft.lbs. (67-74 Nm). Figure 5-22. Piston Seal Installation