MAINTENANCE SERVICE PROCEDURE
4-45
CHECK WHEN CHANGING THE V-BELT
The standard deflection between the air conditioner compressor pulley and fan pulley when pressed with a thumb
(approx. 98 N (10 kgf)) should be approx. 7 to 10 mm (0.28 to 0.4 in).
When a belt tension gauge is used, the standard tension is within a range of 533 to 745 N (54 to 76 kgf).
REMARK
When the belt has been replaced with a new part, a high tension is necessary, so the initial tension is in the value
given above.
ADJUSTING
1. Open the engine side cover on the right side of the
machine.
2. When adjusting, loosen 4 bolts (1), turn 2 adjustment bolts
(2), and move bracket (3) and the compressor as one unit.
3. After adjusting, tighten bolts (1) and the locknut of bolts (2).
NOTICE
q Check each pulley for damage, wear of the V-groove, and wear of the V-belt. In particular, be sure to
check that the V-belt is not touching the bottom of the V-groove.
q In case any of the following occurs, ask the Komatsu distributor in your territory to replace the belts
with new ones.
〈 The fan belt has elongated, leaving little allowance for adjustment.
〈 A cut or crack is found on the belt.
〈 Slipping or creaking sound is heard coming from the belt.
q When the new V-belt is set, readjust it after one hour of operation.
CHECK FOR LOOSE WHEEL HUB BOLTS, TIGHTEN 4
If wheel hub nuts (1) are loose, tire wear will be increased and
may cause accidents.
1. Check for loose nuts, and tighten if necessary.
When checking for loose nuts, always turn the nuts in the
direction of tightening to check.
Tightening torque: 824 to 1030 N·m (84 to 105 kgf·m, 607.6
to 759.5 lbft)
2. If any stud bolt is broken, replace all the stud bolts for that
wheel.
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