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OM-481 Page 26
7-7. Checking And Replacing Engine Belt
Ref. ST-134 730-B / SD-131 784-A
Y Stop engine, and let cool.
A V-belt drives the engine cooling
fan and alternator. To check tight-
ness of belt, proceed as follows:
Remove rear panel.
1 Fan Pulley
2 Alternator Pulley
3 Engine Belt
Place straight edge along top of pul-
leys. Push down belt as far as it will
go, then measure distance from
belt to straight edge.
If less than 1/2 in (13 mm), belt is
okay. If not okay, adjust belt.
To adjust belt tension:
4 Alternator Bracket
Loosen hex nut on bracket.
5 Alternator Pivot Hex Nut
Loosen hex nut. Pivot alternator
clockwise until belt is tight. Tighten
hex nuts.
Recheck tightness of belt. Readjust
if necessary.
To replace belt:
Replace belt if damaged or
cracked. Replace belt as follows:
Loosen hex nuts, pivot alternator
counterclockwise, and remove
belt. Install new belt, pivot alternator
clockwise, adjust tightness, and
tighten hex nuts. Recheck tight-
ness of new belt after operating en-
gine 15 minutes and again after 20
hours.
Reinstall guard and rear panel.
Tools Needed:
1/2 in, 13 mm
1
2
3
4
5
1/2 in (13 mm)
Maximum
OFF
START
RUN
7-8. Servicing Optional Spark Arrestor
ST-800 463-A / Ref. ST-131 784-A
Y Stop engine and let cool.
1 Spark Arrestor
2 Cleanout Plug
Remove plug and remove any dirt
covering cleanout hole.
3 Exhaust Pipe
Start engine, and run at idle speed
to blow dirt out cleanout hole. If
nothing blows out of hole, briefly
cover end of exhaust pipe.
Y Stop engine and let cool.
Reinstall cleanout plug.
1
2
3
Tools Needed:
3/8 in
OFF
START
RUN