Doosan D55C-5 Disassembly/Assembly

Vehicle Systems Disassembly & Assembly 17
4. Hold the spool(2) in a vise using rigid wood
pieces(Fig. 2-1) to prevent damage. Remove cap
screw(8) and remove spring seat(7), spring(9),
wiper(5) and O-ring(4). At this time, take care that
cap screw or other parts are not ejected out by the
force of the spring(9).
5. Remove spring(16) from inside the spool(2).
Remove the valve(15) from the spool(2) by
unscrewing the M4 screw at its end.
Disassembling the Spool Section
Assembly for Attachment
The combination shall be in accordance with the
attached Parts List(Part No. C0213-41202).
The disassembling of the Part No. C0213-41203 in
the attached Parts List is same as this section,
therefore, not described.
1. Remove O-rings(12), (18) from the fitting surface,
and remove spring(11) and poppet(10).
2. Unscrew socket head bolt(15) and remove cap(6).
Take out the spool(2) from the valve housing(1) in
sub-assembled state. At this time, remove seal
plate(3), wiper(5) and O-ring(4) on the cap side as
mounted on the spool.
3. Remove the screw(13) on the opposite side.
Remove seal plate(3), O-ring(4) and wiper(3).
4. Hold the spool(2) in a vise using rigid wood
pieces(Fig. 2-1) to prevent damage. Remove cap
screw(8) and remove spring seat(7), spring(9),
wiper(5) and O-ring(4). At this time, take care that
the cap screw or other parts are not ejected out by
the force of the spring(9)
The disassembled parts have to be arranged in
order to identify their assembly position on work
bench, shelf, etc.
Washing
Wash all the disassembled parts completely with
mineral oil.
Dry the washed parts with compressed air and
arrange them on clean paper or cloth for inspection.
Inspection
Inspect all the parts if they have any burr, scratch,
dent, or any other defect.
1. Confirm that the spool surfaces are free from
scratch or dent.
Small scratch can be removed with oil stone or
cloth with lapping material.
2. Reciprocating parts must move smoothly. All the
holes and paths must be free from foreign matter.
3. Worn, deformed, or broken spring must be
replaced.
4. Check that the sealing face of the valve housing
is smooth, free from dust, rust, or dent.
5. Remove any dent or scratch on the check valve
seat of valve housing by lapping. Take care not to
leave any lapping material in the valve.
6. If relief valve is not in normal order, inspect it in
compliance with the Relief Valve Maintenance
Manual.
7. Replace all the O-rings and back-up rings with
new ones.
8. Check that there is no residual coating debris
around the housing holes and plug seats.
In the event that coating debris is in the valve, it
will cause malfunction and oil leak.

Doosan D55C-5 Specifications

General

Brand	Doosan
Model	D55C-5
Category	Engine
Language	English