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Section III. ORGANIZATIONAL MAINTENANCE TROUBLESHOOTING
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TM-5-6120-250-12 Substation Trailer Mounted 500 KVA AC 4160-416Y/240V 208Y/120V 3 Phase 50/60 Hertz Manual
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Liquid-level Gage
Table 4-2. Organizational Maintenance Troubleshooting Continued.
Malfunction
Probable Cause
Corrective Action
13. Trailer brakes will not apply or
c. Leaky intervehicular hose.
c. Tighten connections or replace.
Hold - Cont'
d
d. Defective emergency relay valve.
d. Test valve and replace if
necessary. para 4-42
e. Other causes.
e. Report other cause to DS
Maintenance.
14. Trailer brakes will not release.
a. Air hose connection wrong.
a. Check and make sure right hose
connections are made.
b. Emergency relay valve will not
b. Replay relay valve para 4-42
release.
c. Weak or broken brakeshoe
c. Refer to DS Maintenance.
retracting spring.
d. Other causes.
d. Refer to DS Maintenance.
15. Trailer brakes drag or grab.
a. Brakes adjusted too.
a. Re-adjust brakes. para 4-41.
b. Weak or broken brakeshoe
b. Refer to DS Maintenance.
retracting spring.
c. Grease on brake lining.
c.
Refer to DS Maintenance.
d. Other causes.
d.
Refer to DS Maintenance.
16. Trailer wheels wobble and tire
a. Loose wheel bearing.
a.
Adjust wheel bearings. para 4- 39.
wear uneven.
b. Broken wheel bearing.
b.
Replace wheel bearings.
c. Bent wheel.
c.
Replace wheel.
d. Other cause.
d.
Refer to DS Maintenance.
17. Trailer will not track when
Bent, misaligned axle, broken spring.
Refer to DS Maintenance
towed.
Section IV. RADIO INTERFERENCE SUPPRESSION
as its source of power. The unit is grounded and the
4-8. General
enclosures are shielded.
The substation is a static or passive device which will
not generate any EMI. Its transmission is only as good
Section V. MAINTENANCE OF HIGH VOLTAGE INCOMING SECTION
4-10. Heater (fig. 2-3).
4-9. Enclosure
Replacement of high voltage cabinet heater.
Keep hinges for front panels tight, free from bends that
(a use binding and pivot pins straight. The pins are not
the removable type and the panel side of hinge is
a. Loosen screw on heater end and remove two
welded to the panel. If the hinge is beyond repair the
wires.
panel assembly must be replaced.  The assembly is
b. Loosen bolts of retaining clips.
bolted to cabinet with two lock nuts on each hinge. By
removing these four lock nuts the panel assembly may
c. Remove heater.
be removed and a new one installed.
d. Install new heater in reverse order.
Section VI. MAINTENANCE OF TRANSFORMER
4-11. General
4-12. Vent Valve Replacement (fig. 3-9)
The insulating liquid must be maintained at the proper
The vent valve has a square body with knurled control
level 4see name plate) and the dielectric strength of the
knob at one end. The other end has a NPT valve. With
liquid should be maintained at a high value. The liquid
transformer de-energized an vented to the atmosphere,
should be sampled and tested after the first few days of
unscrew the vent valve from the transformer.  Apply
operation, again after six months, and yearly thereafter.
teflon tape or pip compound to the threads of new vent
Keep accurate records of the test and filter or replace
valve.  If replacing a used valve make sure threads
the liquid as indicated.
The sampling and test
have bee thoroughly cleaned. Insert valve replacement
procedures are in TM 5-6120-250-34.
an screw in until tight.
4-4

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