TM 9-4110-256-14
CHAPTER 5
DIRECT SUPPORT MAINTENANCE INSTRUCTIONS
SECTION I DIRECT SUPPORT TROUBLESHOOTING INSTRUCTIONS
5-1.
TROUBLESHOOTING.
The following procedures are listed in order of the most probable malfunctions. Each malfunction is followed by test or
inspection procedures in logical order to isolate and identify the fault and actions required to correct it. This section
cannot list all the possible malfunctions that may occur with the equipment. If a malfunction occurs that is not listed or
actions listed do not correct a malfunction, notify your supervisor.
a. Pressure Gage Indicates Above Operating Range.
SERVICE MANIFOLD GAGE READING MATCH
PRESSURE GAGE READING?
YES
NO
CHECK REFRIGERANT SYSTEM PRESSURE
YES
NO
ADJUST REFRIGERANT CHARGE AS NECESSARY
b. Compressor Operates For Short Period Then Stops.
OBSERVE COMPOUND GAGE. DOES PRESSURE
DROP RAPIDLY?
YES
NO
ARE COMPOUND AND PRESSURE GAGES
INDICATING WITHIN NORMAL OPERATING
RANGE?
YES
NO
REPLACE AS NECESSARY.
ADJUST AS NECESSARY.
5-1