JLG 18RS Service Manual - Manual (Page 104)

SECTION 5 - HYDRAULICS
5-14 – JLG Lift – 3121284
2. Use a soft mallet to tap a new wiper seal into the cylin-
der head gland groove. Install a new wear ring into the
cylinder head gland groove.
3. Place a new O-ring and backup ring in the outside diam-
eter groove of the cylinder head.
4. Carefully install the head gland on the rod, ensuring that
the wiper and rod seals are not damaged or dislodged.
Push the head along the rod to the rod end.
5. Push the spacer onto the rod.
6. Place a new O-ring and backup rings in the inner piston
diameter groove.
7. Using suitable protection, clamp the cylinder rod in a
vise or similar holding fixture as close to the piston
threads as possible.
8. Carefully thread the piston on the cylinder rod hand
tight, ensuring that the o-ring and back-up rings are not
damaged or dislodged.
NOTE: When installing the tapered bushing, piston and mating
end of rod must be free of oil.
9. Assemble the tapered bushing loosely into the piston
and insert capscrews through the drilled holes in the
bushing and into the tapped holes in the piston.
10. Tighten the capscrews evenly and progressively in rota-
tion to 9 ft.lbs. (12 Nm).
11. After the screws have been torqued, tap the tapered
bushing with a hammer (16 to 24 oz.) and brass shaft
(approximately 3/4" in diameter) as follows;
a. Place the shaft against the cylinder rod and in con-
tact with the bushing in the spaces between the
capscrews.
b. Tap each space once; this means the tapered bush-
ing is tapped 3 times as there are 3 spaces between
the capscrews.
12. Retorque the capscrews evenly and progressively in
rotation to 9 ft.lbs. (12 Nm).
Figure 5-18. Wiper Seal Installation
Figure 5-19. Installation of Head Seal Kit
Figure 5-20. Tapered Bushing Installation
Figure 5-21. Seating the Tapered Bearing