JLG 4394RT Service Manual - Manual (Page 131)

SECTION 4 - HYDRAULICS
3121133 – JLG Lift – 4-7
1. Using suitable protection, clamp the cylinder rod in
a vise or similar holding fixture as close to piston as
possible.
2. Carefully thread the piston on the cylinder rod hand
tight, ensuring that the o-ring and back-up rings are
not damaged or dislodged.
3. 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.
4. 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.
5. Tighten the capscrews evenly and progressively in
rotation to the specified torque value.
6. 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.
7. Retorque the capscrews evenly and progressively in
rotation to the specified torque value.
8. Remove the cylinder rod from the holding fixture.
Figure 4-11. Piston Seal Kit Installation
Figure 4-12. Tapered Bushing Installation
Figure 4-13. Seating the Tapered Bearing