4-13
Adjusting V-Belt Tension
The V-belt drives the battery charging alternator and
coolant pump (Figure 4-8). See Table 4-1 for
scheduled inspection or replacement. Adjust belt
tension as follows:
1. Disconnect the negative (−) cable at the battery
to prevent the engine from starting.
WARNING
Accidental or remote starting
can cause severe personal injury or death.
Disconnect the negative (−) cable at the bat-
tery to prevent the engine from starting.
2. Remove the belt guard or enclosure top panel
and access doors.
3. Loosen the alternator pivot bolt first and then
the adjusting bracket bolt on top.
4. Pivot the alternator out to tighten belt tension.
Hold tension by tightening the tension adjusting
bolt and then check tension by applying 20
pounds (10 kg) to the middle of the pulley span.
Belt tension is correct when deflection is
3/8 inch (10 mm). Tighten the alternator bolts
when tension is correct.
5. Tighten the bolts, secure the belt guard or en-
closure and reconnect the battery cables (neg-
ative [−] last).
Replacing V-Belt When PTO Equipped
A special belt replacement kit must be used when
the genset is equipped with a PTO. The kit includes
a tool to keep the flexible coupling from twisting dur-
ing assembly/disassembly. The coupling has to be
disassembled so that the belt can be looped around
the crank pulley. Follow the instructions in the kit.
3/8 INCH (10 MM)
DEFLECTION @
20 LBS (10 KG)
ALTERNATOR
PIVOT BOLT
TENSION
ADJUSTING
BOLT
FIGURE 4-8. ADJUSTING V-BELT TENSION
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