Doosan D20G Disassembly/Assembly page 79

b. assembly of lift section.
1. fix section
lateral(machined)faces not to be damaged.
2. Install spool(2) into body(1) smoothly and
slowly. A direction of spool access to body is
same as that of spool disassembly.
3. dust seals(4) put on the end of spool by using
a tool (Fig 8-9)
Note : be careful not to damage a dust seal,
as it could make an external leakage.
4. after fixing the spool end, install seal
plate(3),spring retainer(6) and spring(8). And
tighten set screw(7) by 14NIm
NOTE: make sure that set screws are
tightened by a exact torque. In case of
excessive torque, it could make inappropriate
spool motion. Incase of in sufficient torque
make a excessive drift of cylinder on neutral
position.
5. install cap(5) and tighten two hex bolts(12)
by14N•m.
6. put seal plate(3) on the end of spool and
tighten hex bolts(11) by 14N•m.
7. install hex plug with O-ring by 35N•m.
8. release a section from a vise, and install O-
ring(13), poppet(9) and spring(10) into lateral
face.
Vehicle System
by using a vice
c. assembly of tilt section.
for
1. fix section
lateral(machined)faces not to be damaged.
2. Install spool(2) into body(1) smoothly and
slowly. A direction of spool access to body is
same as that of spool disassembly.
3. dust seals(6) put on the end of spool by using
a tool
Note : be careful not to damage a dust seal,
as it could make an external leakage.
4. install pilot spool(3) and spring (4) into a
bottom of spool.
5. after fixing the spool end, install seal plate(5),
spring retainer(8) and spring(10). And tighten
set screw(9) by 14N•m
NOTE: make sure that set screws are
tightened by a exact torque. In case of
excessive torque, it could make inappropriate
spool motion. incase of in sufficient torque, it
could make a excessive drift of cylinder on
neutral position.
6. install cap(7) and tighten two hex bolts(14)
by14N•m.
7. put seal plate(5) on the end of spool and
tighten hex bolts(13) by 14N•m.
8. r elease a section from a vise, and install O-
ring(13), poppet(9) and spring(10) into lateral
face.
77
by using a vice
Disassembly & Assembly
for