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33 - 7
Mating parts for the Cap and Valve
Housing
Dismantling the Mating parts for the Cap and Valve
Housing
1
On the port 5B2 side of the arm, remove the O-ring (56),
the plug (39) back up rings (57).
2
Remove the spring (23) and the poppet (22).
3
On the port 4A2 side of the bucket, remove the plug
(34), the O-ring (56), the back up rings (57), the springs
(23) and the poppet (33).
Cleaning / Inspection
1
Clean the dismantled parts with a coating of clean oil.
2
Dry with compressed air. Place each part on a clean
sheet of paper or vinyl for inspection.
3
Verify that all sliding parts move easily.
4
Replace the springs if they are damaged, deformed or
worn.
5
Replace all used O-rings and back-up rings with new
before assembly.
6
Check that there is no foreign matter in any passages or
grooves.
7
After removing the cap and plug, Check that there is no
paint residue around the body socket on the edge
surface of the plug. Any remaining paint would cause
contamination, which is the main source of malfunction
or oil leakage.
Assembling the Mating parts for the Cap and Valve
Housing
1
Install the poppet (22) and the spring (23) on the 5B2
port side.
2
Insert the plug (39), the O-rings (56) the back-up ring
(57) to the mating face
3
Install the poppet (33), the spring (23), the O-ring (56),
the back-up ring and the plug (34) on the bucket 4A2
port side.
Section E
Hydraulics
9803/6020
Section E
33 - 7
Issue 1
Control Valve
Summary of Contents for JS70
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