Komatsu 830E-AC Shop Manual page 950

9. Check the system pressure after the recovery
equipment stops. After five minutes, system
pressure should not rise above "0" gauge pres-
sure. If the pressure continues to rise, restart
and begin the recovery sequence again. This
cycle should continue until the system is void of
refrigerant.
10. Check the sight glass oil level to determine the
amount of oil that needs to be replaced. (The
amount of oil that was lost during the recovery
cycle must be replaced back into the system).
11. Mark the cylinder with a "RECOVERED" (red)
magnetic label to reduce the chance of charging
a system with contaminated refrigerant. Record
the amount of refrigerant recovered.
Performing the Recycling Procedure
The recovered refrigerant contained in the cylinder
must undergo the recycle procedure before it can be
reused. The recycle or clean mode is a continuous
loop design and cleans the refrigerant rapidly. Follow
the equipment manufacturer's instructions for this
procedure.
Evacuating and Charging the A/C System
Evacuate the system once the air conditioner compo-
nents are repaired or replacement parts are secured,
and the A/C system is reassembled. Evacuation
removes air and moisture from the system. Then, the
A/C system is ready for the charging process, which
adds new refrigerant to the system.
N4-24
SYSTEM REPAIR
The following service and repair procedures are not
any different than typical vehicle service work. How-
ever, A/C system components are made of soft met-
als (copper, aluminum, brass, etc.). Comments and
tips that follow will make the job easier and reduce
unnecessary component replacement.
All of the service procedures described are only
performed after the system has been discharged.
Never use any lubricant or joint compound to
lubricate or seal any A/C connections.
NOTE: To help prevent air, moisture or debris from
entering an open system, cap or plug open lines,
fittings, components and lubricant containers. Keep
all connections, caps, and plugs clean.
Never leave a/c components, hoses, oil, etc.
exposed to the atmosphere. Always keep sealed
or plugged until the components are to be
installed and the system is ready for evacuation
and charging. PAG oil and receiver-drier desic-
cants attract moisture. Leaving system compo-
nents open to the atmosphere will allow moisture
to invade the system, resulting in component and
system failures.
Operator Comfort 10/06 N04031