Wiper Seal Installation - JLG 400S Service And Maintenance Manual

SECTION 5 - BASIC HYDRAULICS INFORMATION & SCHEMATICS
2. Use a soft mallet to tap a new wiper seal into the appli-
cable cylinder head groove. Install a new wear ring into
the applicable cylinder head groove.
Figure 5-34. Wiper Seal Installation
3. Place a new o-ring and backup ring in the applicable
outside diameter groove of the cylinder head.
Figure 5-35. Installation of Head Seal Kit
4. Install washer ring onto rod, carefully install the cylinder
head 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, as applicable.
5. Carefully slide the piston spacer on the rod.
6. Using suitable protection, clamp the cylinder rod in a
vise or similar holding fixture as close to piston as possi-
ble.
7. Place new o-ring and backup rings in the inner piston
diameter groove.
8. Carefully thread the piston on the cylinder rod hand
tight, ensuring that the o-ring and backup rings are not
damaged or dislodged.
9. Thread piston onto rod end and install the tapered
bushing.
NOTE: When installing the tapered bushing, piston and mating
end of rod must be free of oil.
5-60
10. Install the bolts in tapered bushing.
11. 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.
ROD
Figure 5-36. Tapered Bushing Installation
12. Tighten the capscrews evenly and progressively in rota-
tion to 5 ft.lbs. (7 Nm).
13. 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.
ROD
BRASS SHAFT
Figure 5-37. Seating the Tapered Bearing
PISTON
TAPERED
BUSHING
CAPSCREW
PISTON
CAPSCREW
TAPERED
BUSHING
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