JLG 800A_AJ ANSI Service Manual - Manual (Page 302)

SECTION 5 - HYDRAULICS
5-22 – JLG Lift – 3120740
10. Thread piston onto rod until it abuts the spacer end
and install the tapered bushing.
NOTE: When installing the tapered bushing, piston and mat-
ing end of rod must be free of oil.
WHEN REBUILDING THE MASTER, SLAVE, LOWER LIFT, UPPER
LIFT, ARTICULATING FLY BOOM LIFT, UPRIGHT LEVEL, TOWER
TELESCOPE, OR UPPER TELESCOPE CYLINDERS, APPLY LOCTITE
#242 TO TAPERED BUSHING BOLTS, THEN TIGHTEN SECURELY.
(SEE TABLE 5-1 AND TABLE 5-2 TORQUE SPECIFICATIONS).
11. Install the bolts in tapered bushing using loctite
#242. (See Table 5-1 and Table 5-2 Torque Specs).
12. Remove the cylinder rod from the holding fixture.
13. Place new guide locks and seals in the applicable
outside diameter grooves of the cylinder piston.
(See Figure 5-21., Piston Seal Kit Installation)
14. Position the cylinder barrel in a suitable holding fix-
ture.
EXTREME CARE SHOULD BE TAKEN WHEN INSTALLING THE CYL-
INDER ROD, HEAD, AND PISTON. AVOID PULLING THE ROD OFF-
CENTER, WHICH COULD CAUSE DAMAGE TO THE PISTON AND
CYLINDER BARREL SURFACES.
15. With barrel clamped securely, and while adequately
supporting the rod, insert the piston end into the
barrel cylinder. Ensure that the piston loading o-ring
and seal ring are not damaged or dislodged.
16. Continue pushing the rod into the barrel until the cyl-
inder head gland can be inserted into the barrel cyl-
inder.
17. Secure the cylinder head gland using the washer
ring and socket head bolts. (See Table 5-1 and Table
5-2 Torque Specifications.)
18. 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.
19. If applicable, install the cartridge-type holding valve
and fittings in the rod port block, using new o-rings
as applicable. (See Table 5-2, Holding Valve Torque
Specifications)
Figure 5-22. Tapered Bushing Installation
Figure 5-23. Rod Assembly Installation