Perkins 1103D Operation And Maintenance Manual page 48

48
Maintenance Section
Alternator - Inspect
Inspect the fins for damage. Bent fins may be opened
with a "comb".
Note: If parts of the aftercooler system are repaired
or replaced, a leak test is highly recommended.
Inspect these items for good condition: Welds,
mounting brackets, air lines, connections, clamps
and seals. Make repairs, if necessary.
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/Replace
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.
i02322311
Illustration 21
Typical example
(1) Dial Gauge
Fit the gauge (1) at the center of the longest free
length and check the tension. The correct tension is
535 N (120 lb). If the tension of the belt is below
250 N (56 lb) adjust the belt to 535 N (120 lb).
If twin belts are installed, check and adjust the
tension on both belts.
Adjustment
i02883869
Illustration 22
1. Loosen The alternator pivot bolt (2) and the bolt
(3).
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