Komatsu 170-3 Series, Руководство по ремонту, Страница: 414 / 454

REPAIR AND REPLACEMENT OF PARTS
15-8
170-3 SERIES
(7)
iii) Adjust the position of the grinder so that
the center of grindstone [5] will be at the
center of insert (1), then tighten the set
screw to secure the grinder.
iv) Fully open the throttle of the grinder to
rotate the grindstone and slowly move it
until it contacts insert (1).
v) Press the grindstone against the inside
of the insert, move it in a circular pattern.
a
Make a groove about 1 mm deep.
2) Pull out the insert with the puller head of
valve seat puller A1 according to the follow-
ing procedure.
i)
Push three claws (a) of puller head [6]
inward by hand and put them in insert
(1).
ii) Tighten screw [8] to press the three
claws against the groove on the inside
surface of the insert.
a
If the screw is tightened too strongly,
the insert will break and it will be diffi-
cult to pull it out. Therefore, stop
tightening the screw when the claws
compretely contact the groove.
iii) Place bridge [9] over the puller head,
then place plates [10] and [11] on the
bridge. tighten nut [12] to pull out the
insert.
REPLACING VALVE SEAT INSERTS
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