JLG 1500SJ Service Manual - Manual (Page 389)

SECTION 5 - HYDRAULICS
3121262 – JLG Lift – 5-37
2. Use a soft mallet to tap a new wiper seal into the cyl-
inder 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
diameter groove of the cylinder head.
4. Install washer ring onto rod, 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. Place a new O-ring into the spacer and 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 mat-
ing end of rod must be free of oil.
9. Assemble the tapered bushing loosely into the pis-
ton 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
rotation 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
contact with the bushing in the spaces between
the capscrews.
b. Tap each space once; this means the tapered
bushing 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 5-81. Wiper Seal Installation
Figure 5-82. Installation of Head Seal Kit
Figure 5-83. Tapered Bushing Installation
Figure 5-84. Seating the Tapered Bearing