Piston Seal Kit Installation - JLG 400S Service And Maintenance Manual

SECTION 5 - BASIC HYDRAULICS INFORMATION & SCHEMATICS
14. Rotate the capscrews evenly and progressively in rota-
tion to 9 ft. lbs. (12 Nm).
15. Remove the cylinder rod from the holding fixture.
16. Position the cylinder barrel in a suitable holding fixture.
17. Place new piston seal and wear rings in the outer piston
diameter groove. (A tube, with I.D. slightly larger than
the O.D. of the piston is recommended to install the
solid seal).
WEAR RING
PISTON SEAL
Figure 5-97. Piston Seal Kit Installation
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.
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18. With barrel clamped securely, and while adequately sup-
19. Continue pushing the rod into the barrel until the cylin-
20. Install wear pads onto the wearpad plate using bolts,
21. Apply JLG Threadlocker P/N 0100011 to the capscrews.
22. After the cylinder has been reassembled, the rod should
23. Install the new o-rings and plugs in the cylinder port
24. Install the counterbalance and shuttle valves onto the
25. Apply JLG Threadlocker P/N 0100011 to the capscrews.
MAF00390
porting the rod, insert the piston end into the barrel cyl-
inder. Ensure that the piston loading o-ring and seal ring
are not damaged or dislodged.
der head can be inserted into the barrel cylinder.
washers and nuts.
Secure the cylinder head to the barrel using the plate
and capscrews. Torque capscrews to 20 ft. lbs. (27 Nm).
be pushed all the way in (fully retracted) prior to the
reinstallation of any holding valve or valves.
block. Torque to 23 ft. lbs. (31 Nm).
valve block.
Install the valve assembly at the barrel end of the cylin-
der and secure using capscrews. Torque to 129 in. lbs.
(15 Nm).
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