JLG 450A_AJ Series II Service Manual - Manual (Page 314)

SECTION 5 - HYDRAULICS
5-24 – JLG Lift – 3121180
2. Use a soft mallet to tap a new wiper seal into appli-
cable cylinder head gland groove. Install new wear
ring into applicable cylinder head gland groove.
3. Place a new O-ring and back-up seal in applicable
outside diameter groove of cylinder head.
4. Install washer ring onto rod, carefully install head
gland on rod, ensuring wiper and rod seals are not
damaged or dislodged. Push head along rod to rod
end, as applicable.
5. Carefully slide piston spacer on rod.
NOTE: Upper telescope cylinder piston has an O-ring
installed inside spacer.
6. If applicable, correctly place a new O-ring and back-
up rings in the inner piston diameter groove.
7. Using suitable protection, clamp cylinder rod in a
vise or similar holding fixture as close to piston as
possible.
8. Carefully thread the piston on cylinder rod hand
tight, ensuring O-ring and back-up rings are not
damaged or dislodged.
9. Thread piston onto rod until it abuts spacer end and
install 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, LIFT, OR TELESCOPE
CYLINDERS, APPLY LOCTITE #242 TO TAPERED BUSHING
BOLTS, THEN TIGHTEN SECURELY. (SEE TABLE 2-1 AND 2-3.
TORQUE SPECIFICATIONS).
10. Install bolts in tapered bushing using loctite #242.
(See Table 2-1 and 2-3. Torque Specifications.)
Figure 5-27. Poly-Pak Piston Seal Installation
Figure 5-28. Wiper Seal Installation
Figure 5-29. Installation of Head Seal Kit
Figure 5-30. Piston Seal Kit Installation
Figure 5-31. Tapered Bushing Installation