JLG H340AJ Service And Maintenance Manual page 219

SECTION 5 - BASIC HYDRAULIC INFORMATION & HYDRAULIC SCHEMATICS
8. Piston nut, piston, gland disassembly.
a. Unscrew the Piston Nut.
b. Take the piston apart by sliding off the rod in the
direction of the rod threads.
c. Take the gland apart by sliding off the rod in the
direction of the rod threads.
9. Take apart piston seals.
a. The wear ring is easily taken apart by hand.
b. The piston seal is a two piece seal; the ring at the
outer side is easily removed. Remove the ring inside
of the piston seal.
c. Remove the o-ring.
NOTE: All seals must be discarded after removal. They can not be
reused.
10. Remove the gland seal.
a. Remove the rod seal and backup ring.
b. Remove the retaining ring with a flat-head screw-
driver prior to removing the dust wiper and remove
the dust wiper.
c. Remove the o-ring and backup ring.
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d. The du bushing is pressed in and must be removed
by using a tool as shown below.
DISCARD ALL SEALS AFTER REMOVAL AND REPLACE THEM WITH NEW ONES
FOR ASSEMBLY.
11. MRP BEARING DISASSEMBLY
To remove the MRP bearing, break it into pieces.
12. WASHING AND STORAGE
All removed parts should be washed with cleaning solu-
tion and then coated with light oil to prevent rust. If the
cylinder is not to be reassembled right away, store the
parts and put a covering over them.
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