Table.3-2 Troubleshooting

TM 5-4130-234-13&P

Table.3-2 Troubleshooting (cont)

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

2. VACUUM GAGE FAILS TO INDICATE LEVEL OF VACUUM.

Step 1. Check vacuum gage in accordance with chapter 5, section 3.

If required, replace vacuum gage in accordance with chapter 5, section 3.

Step 2. Test for leakage in vacuum system in accordance with chapter 2, paragraph 2-4.

If required, repair leakage or replace defective compartment in accordance with chapter 5, section 3.

Step 3. Check for defective wiring in vacuum gage wiring circuit. See figure 2-1 for electrical schematic.

If required, repair defective wiring connections in accordance with chapter 5, section 4.

3. PRESSURE FAILS TO RISE IN RESERVOIR WHEN HEATER IS ON.

Step 1. Test pressure switch in accordance with chapter 5, section 3.

If required, replace pressure switch in accordance with chapter 5, section 4.

Step 2. Test for defective heater in accordance with chapter 5, section 3.

If required, replace defective heater in accordance with chapter 5, section 4.

Step 3. Test for defective gages.

If required, replace defective gages in accordance with chapter 5, section 4.

4. VACUUM PUMP MOTOR FAILS TO OPERATE.

Step 1. Check for defective wiring or defective switch (61, fig. 5-2).

If required, repair wiring or replace defective switch.

Step 2. Check that lamp (59) is lit, check for defective wiring and circuit breaker.

If required, repair wiring or replace defective circuit breaker.

Step 3. Check for defective vacuum pump motor.

If required, replace entire vacuum pump.

5. PRESSURE IN RESERVOIR FAILS TO STABILIZE AT APPROXIMATELY 65 PSIG.

Step 1. Check pressure switch (96, fig. 5-2).

If required, replace pressure switch.

Step 2. Check relief valve (109).

If required, replace relief valve.

6. DETECTOR DOES NOT RESPOND TO "REF LEAK"

Step 1. Check for REF LEAK bottle leakage.

If required, refill REF LEAK bottle.

Step 2. Check detector probe for exposure of excessive quantities of refrigerant.

If required, operate detector in clean air for several minutes allowing probe to purge itself.

7. "BALANCE" CONTROL DOES NOT STOP PROBE LAMP FROM FLASHING ON EITHER "SENSITIVITY" RANGE.

Step 1. Check for dirt in sensitive element.

If required, remove sensitive element from probe and blow out with clean air at 10 psig (max).

Step 2. Check for element short circuited.

If required, replace sensitive element.

8. DETECTOR PROBE LAMP CANNOT BE MADE TO FLASH.

Step 1. Check for defective probe lamp.

If required, replace probe.

9. VAPOR SLUDGES FORM IN VACUUM PUMP SIGHT GLASS.

Step 1. Check for contaminated vacuum pump oil.

If required, flush and refills vacuum pump oil.

Step 2. Check for oil leakage at vacuum pump case.

If required, replace vacuum pump case gasket.

Step 3. Check for vacuum pump shaft seal leakage.

If required, replace shaft seal.

Section IV. MAINTENANCE PROCEDURES

Perform periodic maintenance of service unit d. Clean all indicators with a lint-free cloth.

3-9.

e. Clean all plumbing and components with a clean lint-

as follows:

a. Inspect gages for broken glass and for bent or broken free cloth.

f. Check conditions of accessory equipment (1 thru 13,

pointers.

fig. 5-2).

b. Inspect vacuum pump oil for proper level.

c. Inspect inner and outer surfaces for dents and obvious g. Perform entire operation of service unit in accordance

with Chapter 2, Section I.

damages.

3-3