Doosan DP158L Series, Руководство по эксплуатации и техническому обслуживанию

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12. Others/driving system
185
Piston
Disassembly of Piston
1. Pull out the snap ring for piston pin and with a pair of snap
ring pliers.
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2. With a round bar, remove the piston pin.
3. With a pair of pliers, remove the piston rings.
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4. Clean the piston thoroughly.
Assembly of Piston
1. Heat the piston at the piston heater for about 5 minutes
(120 ~ 150
°
C).
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2. By aligning the piston pin hole with the pin hole of
connecting rod’s smaaler end, insert the oil coated piston
pin.
3. With the snap ring plier, inser the snap rings of the piston
pin.
4. With confirming the upper side indication of piston ring,
after assembling the ring in the piston ring groove,
inspect if the movement of ring is smooth.
Piston Inspection
1. Visual inspection
1) Visually check the piston for crack, scratch, wear, etc.
Specially, check the wear status of the ring groove.
2. Piston outside diameter inspection
1) With the outside micrometer, measure the outside diam-
eter.
2) The measuring position is 71.5mm from the piston lower
end, and the direction of measurement must be perpen-
dicular to the piston pin direction.
CAUTION
Confirm the direction of connecting rod and assemble.
CAUTION
Arrange the assembled piston in order as the cylinder
number.