Operation and maintenance manual

90 SEBU8601-01
Maintenance Section
Alternator - Inspect
Personal injury can result from air pressure.
Personal injury can result without following prop-
er procedure. When using pressure air, wear a pro-
tective face shield and protective clothing.
Maximum air pressure a t the nozzle must be less
than 205 kPa (30 psi ) for cleaning purposes.
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 bulb 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. Make repairs, if necessary.
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311
Alternator - Inspect
Perki
ns recommends a scheduled inspection of
the alternator. Inspect the alternator for loose
connections and correct battery charging. Check the
amme
ter (if equipped) during engine operation in
order to ensure correct battery performance and/or
correct performance of t he electrical system. Make
repa
irs, as required.
Check the alternator and the battery charger for
corr
ect operation. If the batteries are correctly
charged, the ammeter reading should be very near
zero. All batteries should be kept charged. The
bat
teries 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
en
gine 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
mo
re easily than a battery with a full charge.
i02680137
Alternator and Fan Belts -
Replace
Refer to Disassembly and Assembly Manual , “
Alternator Belt - Remove and Install”.
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Battery - Replace
Batteries give off combustible gases which can
explode. A spark can cause the combustible gas-
es to igni
te. This can result in severe personal in-
jury or death.
Ensure p
roper ventilation for batteries that are in
an enclosure. Follow the proper procedures in or-
der to help prevent electrical arcs and/or sparks
near bat
teries. Do not smoke when batteries are
serviced.
The battery cables or the batteries should not be
removed with the battery cover in place. The bat-
tery cover should be removed before any servic-
ing is attempted.
Removing the battery cables or the batteries with
the cover in place may cause a battery explosion
resulting i n pe rsonal injury.
1. Switch the engine to the OFF position. Remove
all electrical loads.
2. Turn off any battery chargers. Disconnect any
battery chargers.
3. Ensure that the battery disconnect switch is in the
OFF position.
4. Disconnect the NEGATIVE “-” cable from the
NEGATIVE “-” batte ry terminal.
5. Disconnect the POSITIVE “+” cable from the
POSITIVE “+” battery terminal.
Note: Always recycle a battery. Never discard a
battery. Dispose of used batteries to an appropriate
recycling facility.