Operation and Maintenance Manual SC9DF Electronically Controlled Diesel Engine for Agricultural Equipment
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4.7.3 Check air compressor
An air compressor adopts a small amount of oil to lubricate its
piston ring and moving parts. Cement or carbon deposit will be
generated in the oil when the air compressor has been
running under the normal working temperature for a certain
time. Therefore, the piston ring will lose sealing function due
to high working temperature and pressure if the following
checks are implemented.
Check the air outlet pipe of the air compressor
Discharge the compressed air in the brake air reservoir.
Remove the air outlet pipe from the air compressor.
Measure the total thickness of carbon deposit inside the air
outlet pipe of the air compressor. If the total thickness (×＋×)
exceeds 2 mm, clean and check air compressor cylinder head,
valve assembly and air outlet pipe. Replace them if
necessary.
If the total thickness exceeds the specified limit, check along
the air outlet pipe adapter between the air compressor pump
and the compressed air reservoir until the carbon deposit
thickness is less than the specified limit. Clean or replace the pipe adapter or connector where total thickness of the
carbon deposit exceeds the specified limit.
Inner diameter of
exhaust pipe
Inner diameter of
carbon deposit
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