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

14. Rotate the capscrews evenly and progressively in
rotation to 5 ft.lbs. (7 Nm).
15. Remove the cylinder rod from the holding fixture.
WHEN INSTALLING HYDROLOCK PISTON SEALS, ENSURE SEALS ARE
INSTALLED PROPERLY. REFER TO HYDROLOCKK PISTON SEAL INSTALLATION
FOR CORRECT SEAL ORIENTATION. IMPROPER SEAL INSTALLATION COULD
RESULT IN CYLINDER LEAKAGE AND IMPROPER CYLINDER OPERATION.
Figure 5-38. Hydrolock Piston Seal Installation
16. Place new hydrolock seal and guidelock 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).
HYDROLOCK
GUIDELOCK
SEAL
Figure 5-39. Piston Seal Kit Installation
3121671
SECTION 5 - BASIC HYDRAULICS INFORMATION & SCHEMATICS
HYDROLOCK
RING SEAL
MAF00150
17. 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.
18. With barrel clamped securely, and while adequately sup-
porting the rod, insert the piston end into the barrel cyl-
inder. Ensure that the piston loading o-ring hydrolock
seals and guidelock rings are not damaged or dislodged.
19. Continue pushing the rod into the barrel until the cylin-
der head can be inserted into the barrel cylinder.
PISTON
ROD
BARREL
Figure 5-40. Rod Assembly Installation
20. Apply JLG Threadlocker P/N 0100011 to the socket head
bolts and secure the cylinder head using the washer ring
and bolts. Torque bolts to 20 ft.lbs. (27 Nm).
21. After the cylinder has been reassembled, the rod should
be pushed all the way in (fully retracted) prior to the re-
installation of any holding valve or valves.
22. Install the counterbalance valves and fittings in the rod
port block, using new o-rings as applicable. Torque
valves to 50-55 ft.lbs. (68-75 Nm).
SPACER
HEAD
WASHER RING
ROD
CA SCREW
5-61