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Page Title:
Table 4-4. Vacuum Pump Troubleshooting |
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 TM 5-6640-213-14
Vacuum Pump Troubleshooting
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1.
PUMP FAILS TO START, OR HUMS WITHOUT OPERATING
Step 1.
Check for defective power cord.
Check and repair or replace defective part.
Step 2.
Check for defective switch.
Check switch, if defective replace.
Step 3. Check if unit is very cold and therefore hard to start.
Bring pump to room temperature and start.
Step 4. Check if vanei s stuck in a rotor slot.
Clean pump (para 4-9a.)
Vacuum Pump Flow Rates
Air flow rates at different vacuum and
pressure settings are given below. For
vacuum operation, pump exit pressure is
1 atmosphere (14. 7 psia).
(1)
0
(2)
(2)
Vacuum - mm Hg:
508
127
254
635
381
- in. Hg:
0
5
10
15
20
25
Flow - LPM:
37
31
23
17
8.5
2.8
- CFM:
1.3
1.1
0.8
0.6
0.3
0.1
(1)
0
(2)
Pressure - kg/cm2:
(2)
1.4
0.4
0.7
1.8
1.1
- psig:
0
5
10
15
20
25
Flow - LPM:
37
31
28
26
23
20
- CFM:
1.3
1.1
l.O
0.9
0.8
0.7
(1) no restriction: regulator thumbscrew fully unscrewed.
(2) intermittent operation only.
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