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

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.
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 5-55. 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
RING
Figure 5-56. Piston Seal Kit Installation
3121671
SECTION 5 - BASIC HYDRAULICS INFORMATION & SCHEMATICS
HYDROLOCK
SEAL
MAF00220
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.
20. Apply anti-seize to the threads of the cylinder head.
21. Screw the cylinder head into the barrel using a pin-face
spanner wrench. Torque as shown in Figure 5-44.,
Figure 5-45. and Figure 5-46. as per respective cylinder.
22. Align the cylinder head with the barrel and install the
setscrew in the hole.
23. After the cylinder has been reassembled, the rod should
be pushed all the way in (fully retracted) prior to the
reinstallation of any holding valve or valves.
24. Apply Loctite #222 to the orifice plug.
25. Install the orifice plug, plug, check valve and pressure
compensator valve in the rod port block. Torque as
shown in Figure 5-44., Figure 5-45. and Figure 5-46. as
per respective cylinder.
26. Install the new o-rings and plugs into the cylinder port
block. Torque as shown in Figure 5-44., Figure 5-45. and
Figure 5-46. as per respective cylinder.
5-69