Komatsu 170-3 Series, Руководство по ремонту, Страница: 437 / 454

170-3 SERIES
15-31
REPAIR AND REPLACEMENT OF PARTS
CORRECTING SURFACE ROUGHNESS OF CRANKSHAFT
JOURNAL PORTION
CORRECTING SURFACE ROUGHNESS OF CRANKSHAFT
JOURNAL PORTION
If the roughness of the crankshaft journal portion
does not fulfill the standard, correct the surface
roughness.
1. Cleaning and blowing with air
Before polishing, brush the oil holes and blow
with air.
2. Correcting surface roughness of journal por-
tion
1) When correcting with special polishing
machine
Use a special polishing machine as shown in
the diagram on the right.
i)
Set the rotating speed for the work at 40
–
50 rpm, and use No. 320 paper (belt
type). Perform dry polishing (do not use
honing oil), and move the paper once up
and down the whole journal width for
each joutnal. Move the paper smoothly
and do not stop at any point.
ii) Next, replace with No. 500 paper, coat
the jounal surface with honing oil, and
move the handle [1] of the machine to
the left and right by the amount of play to
give fine movement. Use this movement
to move once up and down the whole
width of the jounal. Move the paper
smoothly and do not stop at any point.
iii) Check the surface roughness, and if it is
not within the standard, polish again
on ce u p an d do wn th e width o f the
journol with No. 500 paper.
(7)
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