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 TM 55-1905-219-14-8
4-5. GENERAL (Continued).
Table 4-10. Air Conditioner Capacity Control
Troubles Troubleshooting (Continued).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Step 4.
Valve lifter mechanism defective. Lifter pins and springs do not retract below valve
seats.
Remove cylinder heads and valve plates. Secure cylinder sleeves. Operate
compressor and by adjusting control valve check that lifter pins and springs retract
below valve seats. Remove cylinder sleeve and replace lifter parts, if defective.
Remove sleeve, piston, and connecting rod, and replace unloader power element, if
defective.
5. Compressor noise varying with unloading.
Step 1.
Valve lifter pins stuck.
Check and replace stuck lifter pins.
Step 2.
Unloader power element piston stuck.
Repair or replace.
Step 3.
Misaligned unloader power element fork.
Realign or replace.
Step 4.
Leaking oil pressure line at connection to unloader power element.
Repair leaking line.
Step 5.
Insufficient oil pressure. Increased and steady valve clatter when cylinder is unloaded.
Clean control oil strainer. Check and remove any other cause of low oil pressure.
6. Rapid unloader cycling.
Step 1.
Partially plugged control oil strainer.
Clean or replace strainer.
Step 2.
Low oil pressure (less than 45 psi above suction pressure).
Clean control oil strainer. Check and remove any other cause of low oil pressure.
4-45
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