JLG 3394RT Service Maintenance Manual page 131

Figure 4-11. Piston Seal Kit Installation
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-
3121133
screws) through the drilled holes in the bushing and
into the tapped holes in the piston.
Figure 4-12. Tapered Bushing Installation
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.
Figure 4-13. Seating the Tapered Bearing
7. Retorque the capscrews evenly and progressively in
rotation to the specified torque value.
8. Remove the cylinder rod from the holding fixture.
– JLG Lift –
SECTION 4 - HYDRAULICS
4-7