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Page Title:
Table 6-1. TROUBLESHOOTING (cont) |
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 TM 55-4920-416-13
NAVAER 17-15C-539
Section VI
TABLE 6-1 (Cont)
TROUBLESHOOTING
TROUBLE
CAUSE
REMEDY
7.
Pump is operating but no vacuum or
Clogged oil filter of oil inlet line.
Clean or replace filter.
pressure is developed. (Cont)
8.
Pressure available but unable to
Defective quick-connect nipple.
Moisten finger and hold over altimeter
obtain more than very little vacuum
nipple, if suction is felt after a few
(low altitude).
moments, nipple is defective and should be
replaced.
Loose bowl on vacuum sump.
Open inspection door on left side and
check to see that bowl tightening screws is
tight.
Cut hose or loose connection.
With the wrenches supplied lightly tighten
each hose connection to make sure that it
is not excessively loose. Note that these
connections need not be more than one
turn tighter than fingertight, or replace
hose.
9.
Unable to obtain adequate vacuum
Loose connections to lines or tubes.
Tighten connections.
when connected to aircraft instrument
lines or pitot tube.
Broken instrument line.
Find and repair break.
Opened or cracked aircraft instrument
Replace instrument.
case.
10. Unable to obtain full altitude when set
Improperly adjusted 80,000 feet vacuum
Replace. Adjust (16, 6-1)
to 80,000 feet.
relief valve.
11. Unable to obtain full altitude to 80,000
Improperly adjusted 50, 000 feet vacuum
Replace. Adjust (16, 6-1)
at feet.
relief valve.
12. Unable to obtain 10 inch vacuum
Improperly adjusted Man. 10 inch vacuum
Replace. Adjust (16, 6-1)
reading on manifold pressure gauge.
relief valve.
13. Unable to obtain proper pressure.
Leaky quick-connect nipple.
Hold finger over the nipple connected to
the panel instrument selected by the
selector switch (airspeed indicator,
manifold pressure, or fuel pressure). If air
pressure is felt after a few moments, nipple
is leaky and should be replaced.
Improperly adjusted pressure relief valve.
Replace. Adjust (16, 6-1)
Leaky relief valve.
Replace relief valve.
31
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