This document is printed from SPI². Not for RESALE
62
SEBU8311-02
Maintenance Section
Alternator - Inspect
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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.
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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 accurately check the belt tension, a suitable gauge
should be used.
g01003936
Illustration 32
Typical example
(1) Burroughs Gauge
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 is
400 N (90 lb) to 489 N (110 lb). The correct tension
for a used belt that has been in operation for 30
minutes or more at the rated speed is 267 N (60 lb)
to 356 N (80 lb).
If twin belts are installed, check and adjust the
tension on both belts.
Adjustment
g01091158
Illustration 33
Typical example
(1) Adjusting bolt
(2) Mounting bolts
1.
Loosen mounting bolts (2) and adjusting bolt (1).