56-101-00212 Revision E
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CHAPTER 5: MAINTENANCE & REPAIR
1. GENERAL
A. Refer to section
for detailed instructions on the
disassembly, cleaning, and reassembly of the tester to maintain the tester in serviceable
condition.
2. REPAIR
A. If during normal operation of the tester an excessive leak (more than 5% of full scale in
one minute) is observed, then proceed as follows:
Note:
Except as noted, refer to Figure 6.
1. Return the Master Gauge to zero (refer to section
).
2. Disconnect the tester from the unit or system under test.
3. Rotate the Selector Valve 90° or halfway between the reservoir position and the
outlet position.
4. Gradually turn the Screw Handle (#1) CW while observing the Master Gauge until
the gauge reaches full scale.
5. Allow a few seconds for the pressure to stabilize, then observe the Master Gauge for
one minute to note the leakage.
6. If the excessive leak is no longer observed, then the leak is in the unit or system
under test or in the interconnecting lines or both.
Note:
Subtract Tester leak from that observed with the entire system.
7. If the same excessive leak is still observed then visually inspect the tester for
evidence of fluid leaking, paying particular attention to the connection for the Master
Gauge.
8. If there is visual evidence found, then note where and return the Master Gauge to
zero.
CAUTION:
DO NOT KEEP ROTATING THE SCREW HANDLE CCW AFTER THE
GAUGE INDICATES ZERO PRESSURE.
9. Fix the leak by tightening the fitting or by draining, dissembling as per section
and applying new Teflon tape then reassemble,
refill, and repeat the test again.
10. If there was no visual evidence found, then the problem may be the two O-Rings
located on the Piston (#2) of Figure 7.