Initial 100 Service Hours Alternator Pulley - Check; Aftercooler Core - Inspect; Every 7500 Service Hours Alternator - Inspect - Perkins 4012-46A Operation And Maintenance Manual

42
Maintenance Section

Aftercooler Core - 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 at the nozzle must be less
than 205 kPa (30 psi) for cleaning purposes.
7. Dry the core with compressed air. Direct the air in
the reverse direction of the normal flow.
8. Inspect the core in order to ensure cleanliness.
Pressure test the core. If necessary, repair the
core.
9. Install the core. Refer to the OEM information for
the correct procedure.
10. After cleaning, run the engine. This will help in
the removal of debris and drying of the core. Stop
the engine.
Aftercooler Core - Inspect
Note: Adjust the frequency of cleaning according to
the effects of the operating environment.
Inspect the aftercooler for these items: damaged fins,
corrosion, dirt, grease, insects, leaves, oil, and other
debris. Clean the aftercooler, if necessary.
For air-to-air aftercoolers, use the same methods that
are used for cleaning radiators.
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 at the nozzle must be less
than 205 kPa (30 psi) for cleaning purposes.
After cleaning, start the engine and run the engine.
This will help in the removal of debris and drying of
the core. Stop the engine.
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,
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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 Pulley - Check
1. Isolate the electrical supply to the engine.
Illustration 28
Typical example
2. Remove the guard (3) in order to gain access to
the drive pulley (1) for the alternator (2).
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