Oshkosh JLG 1500SJ, Service And Maintenance Manual

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SECTION 5 - BASIC HYDRAULIC INFORMATION & HYDRAULIC SCHEMATICS
3121262 – JLG Lift – 5-67
13. Remove the cylinder rod from the holding fixture.
WHEN INSTALLING HYDROLOC PISTON SEALS, ENSURE
SEALS ARE INSTALLED PROPERLY. REFER TO HYDROLOCK
PISTON SEAL INSTALLATION FOR CORRECT SEAL ORIENTA-
TION. IMPROPER SEAL INSTALLATION COULD RESULT IN
CYLINDER LEAKAGE AND IMPROPER CYLINDER OPERA-
TION.
14. Place new hydrolock seals 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 using the washer ring,
JLG Threadlocker (P/N 0100011), and socket head bolts.
Torque to 170 ft.lbs. (230 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 counterbalance valves in the rod port block.
Torque 50-55 ft.lbs. (68-75 Nm).
Figure 5-56. Hydrolock Piston Seal Installation
Figure 5-57. Piston Seal Installation
Figure 5-58. Rod Assembly Installation