75 - 3
Dismantling (cont’d)
Remove the piston, cushion bearing, cushion seal, cylinder
head in that order. (There is no cushion seal for the bucket
ram).
7 Remove the piston seal.
The piston rings can be easily removed by hand.
To move the seal ring, put a screwdriver against the
seal ring as shown and hammer the driver until the seal
ring is cut out.
Remove the 'O'-ring.
Note: Discard the removed seals. Do not reuse.
8 Remove the buffer ring.
A buffer ring (Teflon ring) is installed in a groove in the
cylinder head inside wall. To remove, thrust a sharp-
tipped tool into the buffer ring, pull out the ring from the
groove to allow insertion of a pry bar under the ring
then remove the ring.
Note: Discard the removed seals.
9 Remove the U-ring, back up ring and wiper ring.
Remove the U-ring and back-up ring with a screwdriver.
Remove the press-fitted wiper ring.
Note: Discard the removed seals.
10 Removing the bushing.
Remove the snap ring from the cylinder head.
Remove the bushing using a jig and push out with a
press.
Note: Cleaning and storage.
After cleaning the removed parts with solvent, coat with
hydraulic oil and cover for storage. If left dismantled, rust
and dust may adhere and prevent full performance after
reassembly.
Section E Hydraulics
9803/6410
Section E
75 - 3
Issue 1
Hydraulic Rams
JS03130
Bushing
Bushing
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