New Holland CX720 Repair Manual page 3072

BODY AND STRUCTURE - ENVIRONMENT CONTROL Air-conditioning system
12. Remove the service lines from the vehicle system. If
the recovery equipment has automatic closing shut-
off valves, verify that they are operating properly and
do not leak.
13. Determine the amount of lubricant removed from the
A/C system during the refrigerant recovery process.
Replenish the A/C system with an equal volume of
new, correct lubricant.
Dispose of the used lubricant in accordance with ap-
plicable federal, state and local requirements.
14. The system is now ready to be serviced or repaired.
Flushing
Flushing the system is not recommended. In the
event of a major compressor failure replacing the
compressor output pressure line and receiver/drier
should collect most of the debris.
Some service or repair operations have been flush-
ing A/C systems to remove dirt or other debris. It has
been common practice to use another CFC, usually
R-11, for this purpose. The Clean Air Act prohibits
the use of any CFC for such a purpose where the
CFC may be released into the atmosphere. Methy-
chloroform, a popular flushing agent, is also prohib-
ited.
Use of other flushing solvents may cause other prob-
lems. If a vacuum pump does not remove the sol-
vent, it could affect the chemical stability of the re-
frigerant and lubricant.
Flushing should never be done with shop or other
compressed air. Certain mixtures of air and R-134a are
combustible. The use of air to flush R-134a systems
could result in combustion. Shop air also contains
moisture which would contaminate the system. Z012
IMPORTANT: Never use CFC-11, R-11, CFC-12, R-12,
CFC-113, R-13 or any substance to flush an R-134a sys-
tem. To do so would result in breakdown of the lubricant
and system corrosion.
CAUTION
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