TM 55-2840-254-23
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1-88 CHECK FOR SEAL LEAKAGE (No. 4 AND 5 BEARING) (AVIM) (Continued)
11. Check seal leakage tester (T44) (18) as follows:
a. Connect hose (19) of seal leakage tester (T44)
(18) to calibration block fitting (20).
b. Turn vacuum pump switch (21) to ON posi-
tion and run for one minute.
c. Record reading on vacuum gage (22).
d. Turn vacuum pump switch (21) to OFF posi-
tion. Wait one minute.
e. Turn vacuum pump switch (21) to ON posi-
tion and run for one minute.
f. Record reading on vacuum gage (22).
g. Turn vacuum pump switch (21) to OFF posi-
tion.
h. Compare readings recorded in steps c. and f.
If either reading is below 7 inches Hg., re-
place seal leakage tester (T44) (18).
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