Komatsu D31EX-21, Operation & Maintenance Manual, Page: 232 / 256

SERVICE PROCEDURE
MAINTENANCE
4-52
CHECK PLAY OF TURBOCHARGER ROTOR 4
Contact your Komatsu distributor to have the rotor play checked.
CHECK FOR LOOSE ROPS MOUNT BOLTS 4
(If equipped)
Check that the bolts are not loose and that there is no damage.
If any bolt is loose, tighten it to the following torque.
If there is any damage, replace the bolt with a genuine
Komatsu part.
Tightening torque
Bolt (1): 785 to 98 N·m (80 to 100 kgf·m)
Bolt (2): 230 to 289 N·m (23.5 to 29.5 kgf·m)