MMD Equipment 400S-6B1 - Manual (Page 55)

5. Periodic Inspection/Maintenance
5-16
5.5.21 Check fan belt tension・adjust
[Every 2,000 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 0.5-0.7in.
When pressed(a) with the finger(at approx.98N) at
a point midway between tension pulley and fan pulley.
(A)：Tension pulley
(B)：Fan pulley
(C)：Crankshaft pulley
[Adjusting]
<Procedure>
① Loosen nut“1”.
② Tighten adjustment bolt“2” to move the tension
pulley“3” and adjust so that the deflection of the belt
is approx.98N.The standard deflection of a new belt is
13-15mm.
③ Tighten bolts and nut“1” to hold the tension pulley
“ 3”in position.
④ Check for damage to the pulleys, and wear of the
groove and belt.Be particularly careful to check that
the belt is not in contact with the bottom of the
groove.
⑤ Replace belt if it has stretched, leaving no allowance
for adjustment, or if there is a cut or crack on belt.
⑥ After replacing the belt,operate for one hour,then
adjust again.
Then check the
deflection of the belt
and make sure that
it shall be 0.5 to 0.7in.
A080109
A080110
A080111
A080112
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3
2
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