Takeuchi TB175W, Руководство по ремонту

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III-88 TB175W
Cause: The condenser is not functioning correctly or there may
be an overcharge of refrigerant inside the system. An-
other possibility is lack of (ram) air flow through the
condenser fins during testing. Engine cooling system
component malfunction can cause high pressure by
blocking air flow (radiator shutter) or not providing air
flow (fan clutch) in sufficient quantity.
Repair Procedure:
Inspect the condenser for dirt, bugs or other debris and
clean if necessary. Be sure the condenser is securely
mounted and there is adequate clearance (about 1-1/2
inches) between it and the radiator. Check the radiator
pressure cap and cooling system, including the fan, fan
clutch, drive belts and radiator shutter assembly. Re-
place any defective parts and then recheck AC system
operation, gauge readings and performance.
If the problem continues, the system may be over-
charged (have too much refrigerant inside). Recover the
system slowly until low and high pressure gauges read
below normal, and bubbles appear in the sight glass.
Then add refrigerant (charge the system) until pressures
are normal and the bubbles disappear. Add another
quarter to half pound of refrigerant and recheck AC sys-
tem operation, gauge readings and performance.
If the high gauge readings do not change, you should
recover all of the refrigerant and flush (it may be par -
tially plugged) or replace the condenser. Also replace
the receiver-drier or accumulator. Then connect the
components and evacuate the system. Recharge the air
conditioner with refrigerant and check system operation
and performance.
Manifold Gauge Set Readings