Komatsu D31EX-21, Operation & Maintenance Manual, Page: 207 / 256

MAINTENANCE
SERVICE PROCEDURE
4-27
CHECK AND TIGHTEN TRACK SHOE BOLTS 4
If the machine is used with track shoe bolts (1) loose, they will
break, so tighten any loose bolts immediately.
ORDER FOR TIGHTENING
Tighten the bolts in the order shown in the diagram on the right.
METHOD OF TIGHTENING (TRACK SHOE BOLTS)
1. First, tighten to tightening torque (A), then check that the nut and shoe are in tight contact with the link mating
face.
2. After checking, tighten further to tightening angle (B).
METHOD OF TIGHTENING (MASTER CONNECTING BOLT)
1. First, tighten to tightening torque (A), then check that the link mating face is in tight contact.
2. After checking, tighten further to tightening angle (B).
CHECK ELECTRICAL INTAKE AIR HEATER 4
Before the start of the cold season (once a year), contact your Komatsu distributor to have the electrical intake air
heater repaired or checked for dirt or disconnections.
D31EX,PX
D37EX,PX
D39EX,PX
Tightening torque (A)
118 ± 19.6N·m
(12 ± 2kg·m)
196 ± 19.6N·m
(20 ± 2kg·m)
Tightening angle (B) 90° ± 10° 120° ± 10°
D31EX,PX
D37EX,PX
D39EX,PX
Tightening torque (A)
147 ± 19.6N·m
(15 ± 2kg·m)
196 ± 19.6N·m
(20 ± 2kg·m)
Tightening angle (B) 180° ± 10° 180° ± 10°