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MAINTENANCE
METHOD FOR CHECKING FAN BELT TENSION AND REPLACING FAN BELT
•
The opening and closing (tilting) operation of the floor is necessary when performing this mainte-
nance, and it may cause serious personal injury or death.
Before opening and closing of the floor, thoroughly read "METHOD FOR OPENING AND CLOSING
FLOOR UNIT", and then start the operation, or ask your Komatsu distributor to perform the work.
•
Immediately after the engine is stopped, its parts and oil are still very hot and may cause burn in-
jury.
Wait for the temperature to go down, and then start the work.
1.
Pull the engine rear cover (1) backward to open it.
Open the engine rear cover (1) fully and it is secured by
rod (2).
2.
Check the fan belt tension.
Press the belt with a finger at a point midway between the
crank pulley and fan pulley. (approximately 98 N {approxi-
mately 10 kg} )
If deflection is in the standard range (9 to 13 mm {0.354 to
0.512 in} ), the fan belt tension is correct.
If the deflection is out of the standard range, adjust it into the standard range according to the following pro-
cedure.
1)
Open the floor.
For details, see "METHOD FOR OPENING FLOOR UNIT".
2)
Loosen the mounting nut (4) under alternator (3),
mounting bolt (6) of belt adjuster (5), and mounting
bolt (7) of belt adjuster (5).
3)
Turn the lock nut (8) for adjuster bolt and adjustment
bolt (9) to adjust the position of alternator (3).
Turn the adjustment bolt (9) clockwise to increase the
tension.
4)
Check the fan belt tension again.
If the tension is not correct, adjust it again.
5)
After the position of alternator (3) is fixed, tighten the
mounting nut (4), mounting bolt (6) of belt adjuster (5), and tightening bolt (7) to the belt adjuster (5) to
secure the alternator (3).
6)
Check each pulley for damage, wear of the V-groove, and the wear of the V-belt. In particular, be sure
to check that the V-belt is not touching the bottom of the V-groove.
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WARNING
MAINTENANCE PROCEDURE
4-83
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