Table 2-1. Mechanical Troubleshooting (Cont)
TEST OR INSPECTION
Compressed air used to test expansion valve should never exceed 30 psi
(207 kPa). Use only effective chip guarding and personnel protective
equipment (goggles/shield, gloves, etc.). Failure to follow this warning
may result in serious injury to personnel.
Remove expansion valve. (See paragraph 10-27) Check expansion valve for
clogged inlet screen.
Clear inlet screen if clogged.
if inlet screen is not clogged, attempt to blow through expansion valve using
compressed air not to exceed 30 psi (207 kPa). if unable to blow through
expansion valve, replace expansion valve.
COMPRESSOR ENGAGED BUT NOT OPERATIONAL
Start engine. inspect compressor clutch for slipping. if compressor clutch is
slipping, shut off engine and check gap between compressor clutch plate and
compressor pulley. Gap should be 0.022-0.057 in. (0.560-1 .450 mm).
if gap is not within specifications, disassemble compressor and check for
mispositioned shaft or key. (See paragraph 10-24)
Test air conditioning system, (See paragraph 10-20)
if system has proper charge, repair compressor. (See paragraph 10-24)
Check differential lubricating oil level. (See LO 9-2320-289-12)
Check companion flanges for excessive rundout (looseness). (See paragraphs 6-7,
6-9, and 6-10)
Titghten loose components and replace any damaged components.
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