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TM 1-4920-458-13&P
3-10.
DRAINING THE OIL SUMPS
The filters in the system are equipped with oil sumps which permit only air to enter the vacuum and pressure lines to the
instruments. Once the oil collects to a level occupying more than 50 percent of the total glass area of the sumps, the
sumps must be drained. To drain the sumps proceed as follows:
a.
Remove back of tester to gain access to interior.
b.
Loosen star nut (1) and screw (2) by turning counterclockwise.
c.
Swing retainer (3) away from bowl (4).
d.
Remove sump bowl (4) from sump mounting body (5) to empty oil.
e.
Clean sump bowl (4) and filter (6) with a lint free cloth dampened in alcohol (D4).
f.
Install sump bowl (4) into sump mounting body (5).
g.
Swing retainer (3) under bowl (4) and adjust star nut (1) and screw (2) to tighten.
h.
Operate test set for maximum pressure as well as vacuum settings to ensure no system leaks exist.
3-6
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