JLG 450A Service And Maintenance Manual page 31

SECTION 2 - PROCEDURES
7. If applicable, correctly place new seals and guide
lock rings in the outer piston diameter groove. (A
tube, with I.D. slightly larger than the O.D.of the pis-
ton is recommended to install the solid seal.)
NOTE: The backup rings for the solid seal have a radius on
one side. This side faces the solid seal.(See magni-
fied insert in Figure 2-13.)The split of seals and
backup rings are to be positioned so as not to be in
alignment with each other.
Figure 2-13. Piston Seal Kit Installation
8. Using suitable protection, clamp the cylinder rod in
a vise or similar holding fixture as close to piston as
possible.
9. Carefully thread the piston on the cylinder rod hand
tight, ensuring that the o-ring and back-up rings are
not damaged or dislodged.
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.
2-14
WHEN REBUILDING THE STEER, AXLE OSCILLATION, LOWER
LIFT, LEVEL CYLINDER, UPPER LIFT CYLINDER, OR E.A.R. CYL-
INDERS, APPLY LOCTITE #242 TO TAPERED BUSHING BOLTS,
THEN TIGHTEN SECURELY. (SEE TABLE 2-1 AND 2-2. TORQUE
SPECIFICATIONS).
11. Assemble the tapered bushing loosely into the pis-
ton and insert JLG capscrews (not vendor cap-
screws) through the drilled holes in the bushing and
into the tapped holes in the piston.
Figure 2-14. Tapered Bushing Installation
12. Tighten the capscrews evenly and progressively in
rotation to the specified torque value. (See Table 2-1,
Cylinder Head and Tapered Bushing Torque Specifi-
cations.)
13. After the screws have been torqued, tap the tapered
bushing with a hammer (500 to 750 gram) and brass
shaft (approximately 19 mm in diameter) as follows;
a. Place the shaft against the cylinder rod and in
contact with the bushing in the spaces between
the capscrews.
– JLG Lift – 3120869