Check Fan Belt, Replace - Komatsu PC88MR-10 Shop Manual

30 Testing and adjusting
Engine and cooling system

Check fan belt, replace

a Replacing tools
Sym-
Part No.
bol
1 796 401 1300 Fixing jig
2 796 401 1330
3 796 401 1310
U
4 01583 13018 Nut
Commercially
5
available
a The auto-tensioner is provided for the fan belt.
Thus, usual checking and adjusting the belt is
not necessary.
a When replacing the fan belt, remove the air
conditioner compressor belt beforehand.
Place the machine on a level ground and
lower the work equipment to the ground.
Testing
(PC88MR-B430-280-K-00-A)
1. Remove cover (1).
2. Check the fan belt (4).
a Replace the fan belt (4) in the following
cases.
The alternator belt has a vertical scratch
(b) which crosses the horizontal scratch
(a).
The alternator belt has tears (c).
Need not to be replaced if it has only a
horizontal scratch (d).
a Possible causes of the damage on the belt
Improper tension has been applied.
Part whose size or length is wrong has
been used.
Pulley is out of the position.
Pulley is damaged.
auto-tensioner is damaged.
Installation state is improper.
Severe operating environment
Oil and grease are attached to the side of
the belt.
30-26
(PC138-B430-360-K-00-A)
Part name
Collar
Bracket
Wrench
a If the belt is obviously worn, there is a
possibility that the auto-tensioner is also
worn and the surface of the pulley is rough.
In that case, the newly replaced belt may be
worn early if the pulley is continuously used.
Therefore, replacement of the belt and auto-
tensioner as a set is recommended.
Replace
(PC88MR-B430-923-K-00-A)
1. Install guide collar U2 to spacer (3) of auto-
tensioner (2).
2. Insert holding bracket U3 into collar U2 and
tighten it lightly with nut U4.
a At this time, fit hollow part "a" of holding
bracket U3 to protruding part "b" of auto-
tensioner (2).
PC88MR-10