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 new wear rings into
the applicable inside diameter of the cylinder head
groove.
Figure 5-51. Wiper Seal Installation
3. Place new o-rings and backup ring in the applicable out-
side diameter groove of the cylinder head.
O-RING
BACKUP RING
Figure 5-52. Installation of Head Seal Kit
4. Carefully install the cylinder head on the rod, ensuring
that the backup rings, wear rings, rod seals and wiper
seals are not damaged or dislodged. Push the head
along the rod to the rod end.
5. Place a new o-ring in the inside diameter groove of
spacer.
6. Install the spacer tube onto the cylinder rod.
7. Place a new o-ring and backup ring 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 possi-
ble.
9. Carefully thread the piston on the cylinder rod, hand
tight, ensuring that the o-ring and backup ring is not
damaged or dislodged.
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NOTE: When installing the tapered bushing, piston and mating
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
12. Tighten the capscrews evenly and progressively in rota-
tion to 9 ft. lbs. (12 Nm).
O-RING
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:
MAF00210
end of rod must be free of oil.
PISTON
Figure 5-53. Tapered Bushing Installation
a. Place the shaft against the cylinder rod and in con-
tact with the bushing in the spaces between the
capscrews.
b. Place the shaft against the cylinder rod and in con-
tact with the bushing in the spaces between the
capscrews.
ROD
BRASS SHAFT
Figure 5-54. Seating the Tapered Bearing
TAPERED
BUSHING
CAPSCREW
PISTON
CAPSCREW
TAPERED
BUSHING
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