Operation and maintenance manual

SEBU7833-03 53
Maintenance Section
Alternator - Inspect
After cleaning
, start the engine and accelerate the
engine to high idle rpm. This will help in the removal
of debris and drying of the core. Stop the engine.
Use a light bul
b behind the core in order to inspect
the core for cleanliness. Repeat the cleaning, if
necessary.
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. Ma
ke repairs, if necessary.
i02322311
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.
i01929797
Altern
ator an d Fan Belts -
Inspect/Adjust/Re place
Inspec
tion
To maximize the engine performance, inspect the
belts f
or wear and for cracking. Replace belts that are
worn or damaged.
For applicatio
ns 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 loa
d 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 sli
p enough to cause overheating.
To accurately check the belt tension, a suitable gauge
shouldbeuse
d.
g01003936
Illustration 26
Typical example
(1) Burroughs 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
tensiononbothbelts.
Adjustment
g010039
39
Illustration 27
1. Loosen The alternator pivot bolt (2) and the bolt
(3).