Perkins 402J-05 Operation And Maintenance Manual page 71

M0087369-08
Alternator - Inspect
Perkins recommends a scheduled inspection of the
alternator. Inspect the alternator for loose
connections and correct battery charging. Check the
ammeter (if equipped) during engine operation in
order to ensure correct battery performance and/or
correct performance of the electrical system. Make
repairs, as required.
Check the alternator and the battery charger for
correct operation. If the batteries are correctly
charged, the ammeter reading should be very near
zero. All batteries should be kept charged. The
batteries should be kept warm because temperature
affects the cranking power. If the battery is too cold,
the battery will not crank the engine. When the
engine is not run for long periods of time or if the
engine is run for short periods, the batteries may not
fully charge. A battery with a low charge will freeze
more easily than a battery with a full charge.
Alternator and Fan Belts -
Inspect/Adjust
Inspection
To maximize the engine performance, inspect the
belts for wear and for cracking. Replace belts that are
worn or damaged.
For applications that require multiple drive belts,
replace the belts in matched sets. Replacing only one
belt of a matched set will cause the new belt to carry
more load because the older belt is stretched. The
additional load on the new belt could cause the new
belt to break.
If the belts are too loose, vibration causes
unnecessary wear on the belts and pulleys. Loose
belts may slip enough to cause overheating.
To check accurately the belt tension, a suitable
gauge should be used.
Copyright of Perkins Engine Company Limited. NOT FOR REPRINTING OR RESALE
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Illustration 44
Typical example
(1) Burroughs Gauge
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Install the gauge (1) at the center of the belt between
the alternator and the crankshaft pulley and check
the belt tension. The correct tension for a new belt on
a specific engine is detailed in table 37 . The correct
tension for a used belt on a specific engine that has
been in operation for 30 minutes or more at the rated
speed is detailed in table 37 .
If twin belts are installed, check and adjust the
tension on both belts.
Illustration 45
Typical example
71
Maintenance Section
Alternator - Inspect
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