Wiper Seal Installation - JLG 400S Service And Maintenance Manual

2. Use a soft mallet to tap a new wiper seal into the appli-
cable cylinder head groove. Install new wear rings into
the applicable inside diameter of the cylinder head
groove.
Figure 5-93. Wiper Seal Installation
3. Place new o-ring and backup ring in the applicable out-
side diameter groove of the cylinder head.
O-RING
Figure 5-94. Installation of Head Seal Kit
4. Carefully install the cylinder head on the rod, ensuring
that the wear ring, rod seal and wiper seal are not dam-
aged or dislodged. Push the head along the rod to the
rod end.
5. Place new o-rings in the applicable inside diameter
groove of spacer.
6. Install the spacer tube onto the cylinder rod ensuring
that the o-rings are not damaged or dislodged.
7. Place a new o-ring and backup rings in the inner piston
diameter groove.
8. Using suitable protection, clamp the cylinder rod in a
vise or similar holding fixture as close to piston as
possible.
9. Carefully thread the piston on the cylinder rod till it
abuts the spacer, ensuring that the o-ring and backup
ring is not damaged or dislodged.
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SECTION 5 - BASIC HYDRAULICS INFORMATION & SCHEMATICS
BACKUP RING
MAF00380
NOTE: When installing the tapered bushing, piston and mating
end of rod must be free of oil.
10. Insert the tapered bushing into piston.
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 5-95. Tapered Bushing Installation
12. Tighten the capscrews evenly and progressively in
rotation to 9 ft. lbs. (12 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. Place the shaft against the cylinder rod and in
contact with the bushing in the spaces between the
capscrews.
ROD
BRASS SHAFT
Figure 5-96. Seating the Tapered Bearing
PISTON
TAPERED
BUSHING
CAPSCREW
PISTON
CAPSCREW
TAPERED
BUSHING
5-87