Komatsu 170-3 Series, Shop Manual, Page: 436 / 454

REPAIR AND REPLACEMENT OF PARTS
15-30
170-3 SERIES
Unit: mm
Inspection item Judgement standards Remedy
D. End play of crank-
shaft
Standard value Repair limit
Replace thrust
bearing or correct
with oversize
0.140 – 0.320 0.69
E. Thickness of thrust
bearing
Size
Standard
size
Tolerance Repair limit
Replace thrust
bearing or correct
crankshaft with
oversize
STD 4.0
-0.07
-0.12
3.79
0.25 US 4.125 3.92
0.50 US 4.25 4.04
0.75 US 4.375 4.17
1.00 US 4.5 4.29
F. Outside diameter
of crankshaft pin
journal
Size
Standard
size
Tolerance Repair limit
Correct with under-
size or replace
STD 108.00
0
-0.022
107.91
0.25 US 107.75 107.66
0.50 US 107.50 107.41
0.75 US 107.25 107.16
1.00 US 107.00 106.91
G. Out-of-roundness
of crankshaft pin
journal
Standard value Repair limit
0 – 0.010 0.010
H. Clearance of
crankshaft pin jour-
nal
0.058 – 0.132 0.18
Replace connect-
ing rod bearing
I. Outside diameter
of main journal
Size
Standard
size
Toleranc Repair limit
Correct with under-
size or replace
STD 140.00
0
-0.025
139.91
0.25US 139.75 139.66
0.50US 139.50 139.41
0.75US 139.25 139.16
1.00US 139.00 138.91
J. Out-of-roundness
of main journal
Standard value Repair limit
0 – 0.010 0.010
K. Clearance of main
journal
0.076 – 0.152 0.20
Replace main
bearing
L. Curvature of
crankshaft
(total runout of
indicator)
Standard Repair limit
Replace
Total coaxiality of
main journal
Max. 0.150 0.150
Coaxiality of neigh-
boring journals
Max. 0.070 0.070
(7)
TESTING AND INSPECTING CRANKSHAFT
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