MMD Equipment 400S-6B1 - Manual (Page 46)

5. Periodic Inspection/Maintenance
5-7
5.5.4 Check alternator drive belt tension・adjust
[Every 250 hours]
If belt tension too tight, it can cause shaft breakage or shorten the life of a bearing. If too loose, the belt
may slip and will cause early breakage or damage to the belt.
[Checking]
The standard deflection for the drive belt is (A) When
pressed with a thumb(at approx.98.1N) at a point
midway between drive pulley“2” and alternator
pulley“1”
(A)：0.5 to 0.6in.
[Adjusting]
<Procedure>
① Loosen bolts and nuts “3”,“4”,“5”in number order,and
move the alternator.
If nut“6”is tightened,the belt tension will increase; if
nut“６”is loosened,the belt will become loose.
② After adjusting the belt, tighten bolts and nuts from“3”
to “5”in reverse number order from“5”to “3”
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.
Check belt and if no adjusting margin or any cut or
crack is found on belt, replace it.
When replacing belt, readjust it after continuing
test operation about one hour.
1
2
A080107
A080108
Then check the
deflection of the belt
and make sure that
it shall be 0.5 to 0.6in.
3
4 5
6