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MAINTENANCE
High-Strength Bolt Connections (continued)
Retightening procedure of the crawler carrier
mounting bolts
REMARK
The required tightening torque for the mounting bolts of the
crawler carriers has been determined and applied during the
assembling procedure of the excavator at the mine site. This pro-
cedure has to be repeated one time after the first 1000 operating
hours through your Komatsu dealer.
General
The required tightening torque for all mounting bolts (M48), illus-
tration Z25246 has to be determined with the four measuring bolts
(7), which dimension is analogous to the mounting bolts.
The required axial tensioning force of the bolts (M48) is deter-
mined by means of the elongation of the bolts.
For determination of the tightening torque, two especially pre-
pared measuring bolts (7) are installed on each crawler carrier.
The measuring bolts can be identified by the centering dot at the
bolt head and the milled area at the shaft end.
Necessary equipment for the retightening procedure:
Measuring device (1 - 6) delivered with the new machine, see
table below.
Special hydraulic torque wrench, see illustration Z24072 on
page 427. This tool will be provided by your Komatsu dealer.
Measuring Device PN 92847640
Position
1
2
3
4
5
6
7
4.12 EVERY 1000 OPERATING HOURS OR EVERY 6 MONTH
Part name
Angle bar
Dial gauge
Screw M5x16
Feeler
Bolt M10x25
Washer
Measuring bolts
(installed)
Part No.
928 475 40
092 706 40
502 515 98
477 172 40
307 777 99
517 122 98
913 613 40
Qty.
1
1
1
1
2
2
4
423
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