Komatsu 170-3 Series, Руководство по ремонту, Страница: 452 / 454

REPAIR AND REPLACEMENT OF PARTS
15-46
170-3 SERIES
(7)
REPLACING CRANKSHAFT GEAR
1. Removal of gear
•
Make a scratch in the surface at the root of the
teeth with a grinder, then assemble tools K1 and
K2 and turn nut [1] to remove the gear.
a
If the gear cannot be removed in this way,
make a scratch in the surface at the root of
the teeth with a grinder, then heat the gear
with a gas burner and knock the gear out
with a copper rod.
a
Be careful not to damage the crankshaft.
2. Press fitting gear
1) Check the gear mounting surface, key
groove, and flange surface, and if there are
any scratches, correct them with an oilstone.
2) Knock a new key into the key groove of the
shaft.
3) Heat the gear for the specified time at the
specified shrink-fitting temperature.
a
Gear shrink-fitting temperature: Max. 170
°
C
Heating time: Min. 30 minutes
4) Put the timing mark of the rear gear on the
outside, then use a hitting tool to press fit
until the side face of the gear is in close con-
tact with the crankshaft flange.
a
Knock in quickly before the gear becomes
cool.
a
There is not a timing mark on the front
gear.
REPLACING CRANKSHAFT GEAR
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