TM 55-4920-231-14
Table 4. Operator's Daily Services (Cont)
Producdure
X
X
X
Oil sumps. Check vacuum and pressure sumps for pressure of oil. Clean sump and
filter when there is oil present
x
Valves. Check all valves for proper operation. They must turn freely but not be too
loose.
x
Work area. Place testar on a firm and level stand in a clean, well-lighted area at a
height at which the instruments are easily visible and the controls readily accessible.
x
Power source. Provide a power source compatible with the requircmens of the tester
and make certain all connections are secure.
x
publications. Provide a serviceable copy of this manual, TM 50-4920-231-14, and the
current lubrication order for the equipment.
x
Accessories. Check table 1 to see that all accessories are with equipment or accounted
for.
x
Case leak test. Perform master instrument case leak test to determine if there is leak-
age in tester instrument.
x
Unusual operation. Check for unusual noises, excessive vibration, evidence of over-
heating, and lack of pressure or vacuum. Stop teeter immediately when an unusus
condition exists and do not resume operation until it is determined that no further
damage will result, or the defect is repaired.
x
Stopping. Remove all foreign material and clean tester and accessories thoroughly.
Account for all accessories and stow them neatly and compactly in cover compart-
ment.
Section IV. TROUBLESHOOTING
The possible remedy recommended is described
55. GENERAL.
opposite the probable cause.
This section provides information useful in
56. TROUBLESHOOTING.
diagnosing and correcting unsatisfactiry opera-
A tabulation of symptoms of probable troubles
tion or failure of the tester, or any of its com-
and remedies which are likely to be encountered
ponents Each trouble symptom stated is fol-
before, during, or after operation, and repair of
the equipment are contained in table 5.
lowed by a list of probable cause of the trouble.
Table 5. Troubleshooting
Possible remedy
Probable cause
Trouble
Item No.
Provide a power source
No power source.
Indicator light does not
(paragraph 35),
illuminate and motor does
Tighten connection.
Loose connection on power cable.
not run when power
Repair or replace cable
Defective power cable (check
switch is in ON
continuity, figure 10).
position.
AC OPERATION ONLY
Repair or replace wiring harness
Defective lead or connection be-
tween connector and capacitor
(check continuity, figure 10).
Repair or replace wiring harness
Defective lead or connection be-
tween capacitor and rectifier.
(Check for continuity and
shorts, figure 10.)
Replace rectifier (paragraph 80).
Open rectifier or shorted
capacitor and motor.
Replace capacitor.
(Check voltage on yellow coded
lugs of rectifier. If voltage
