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MANOMETER - TM-5-6640-214-140120
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TM-5-6640-214-14 Petroleum Base Laboratory Assembly NSN
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Before Operation Service
TM 5-6640-214-14
b. Troubleshooting. The operator should be guided by the following chart (table 4-2) in diagnosing and correcting
operating difficulties.
Table 4-2. Manometer Troubleshooting Chart
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1. NO PRESSURE (READING)
Step 1. Check if pressure is not being applied to either or both sides
of the instrument.
Check for plugged or leaking pressure lines. Make applicable
correction.
Step 2. Inspect atmospheric pressure connection for proper venting to
atmosphere.
Make applicable correction to ensure proper venting.
Step 3. Check for foreign particles in internal passages of the meter
which are blocking the flow.
Remove mercury from meter and check internal passages for
foreign particles. Clean instrument as required.
2. HIGH OR LOW PRESSURE READING
Step 1. Check for leaks or obstructions.
Locate leaks or obstructions, make applicable connections.
Step 2. Check tubing and/or mercury for foreign matter.
Disassemble and clean instrument, replace mercury.
Step 3. Check for improper zero setting.
Check zero setting. Make proper adjustment.
4-5. VACUUM PUMP.
a. Lubrication.
(1) Motor. Lubricate monthly with engine crankcase lubricating oil.
4-23

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