Komatsu 830E-AC Shop Manual page 951

System Flushing
If any contaminants are found in system hoses, com-
ponents or oil, the entire system must be flushed.
Major components such as the compressor are
extremely susceptible to foreign particles and must
be replaced. If contaminated, the evaporator and
condenser must also be replaced. The evaporator
and condenser are multi-pass units, and they can not
be properly cleaned by flushing.
Only SAE and/or Mobile Air Conditioning Society
(MACS) approved flushing methods with the
appropriate refrigerants are to be performed
when removing debris from the system. Other
methods may be harmful to the environment, as
well as air conditioning components.
1. Remove the compressor, receiver-drier, expan-
sion valve, and accumulator.
N04031 10/06
2. Inspect all other components such as the con-
denser, evaporator, hoses and fittings. If any of
these items are damaged or highly contami-
nated, replace the components.
3. Flush the remaining hoses with a flushing unit.
Use only R134a as a flushing agent.
4. After flushing, blow out the system with dry
shop air for 5 to 10 minutes.
5. If the expansion valve has been removed of all
foreign contamination, it may be re-installed
back into the system. If contamination is still
present, replace the valve.
6. Install a new compressor, receiver-drier, and
accumulator.
7. Add oil to the system as outlined in Checking
System Oil.
Operator Comfort N4-25