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Page Title:
Table 6-1. TROUBLESHOOTING (cont) |
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 TM 55-4920-416-13
Section VI
NAVAER 17-15C-539
TABLE 6-1 (Cont)
TROUBLESHOOTING
TROUBLE
CAUSE
REMEDY
4.
Indicator lamp lights; motor does not
Commutator dirty.
Remove armature according to the
run.
procedure given in paragraph 5-26 and
(Cont)
clean commutator.
Worn out brushes on motor.
Replace brushes in accordance with
procedure given in paragraph 5-24 and
Open motor armature or field.
Remove connector on motor. Resistance
between motor input and ground:
Approximately 1.7 ohms. If circuit is open,
replace motor and return for overhaul.
5.
Intermittent operation of motor and
Defective power switch.
Replace switch.
lamp.
6.
Motor runs slow when not pumping
Low voltage.
Filter capacitor open. Replace.
against a vacuum or pressure load.
Worn brushes.
Replace brushes.
Poor brush contact.
Run-in to seat brushes.
Brushes sticking in brush holders.
Clean brushes by rubbing on crocus cloth .
Clean brush holders with a small brush and
blow out with compressed air.
Wrong oil in reservoir for low temperature.
Commutator dirty.
Remove armature and clean commutator
according to paragraph 5-22.
Defective bearings.
Replace bearings.
7.
Pump is operating but no vacuum or
Lack of oil in reservoir.
Fill with proper oil.
pressure is developed.
Ball check valve stuck.
Uncouple hose from ball check valve,
remove valve, clean and replace.
NOTE
Bad leaks in the pressure
system will not prevent the
vacuum side from working; bad
leaks in the vacuum system will
not prevent pressure from
building up properly.
Vacuum check valve stuck.
Uncouple hose from vacuum check valve,
open up check valve, clean and replace.
Clogged intake filter (decrease vacuum)
Clean or replace filter.
control valve inlet.
30
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