Onan MEP-003A - Page 33

TM5-6115-585-34
NAVFAC
P
-
8-262-12
TO
-
35C2-3-455-2
TM
-
05684C
-
34
Table
2-3
.
Troubleshooting
MALFUNCTION
TEST
OR
INSPECTION
CORRECTIVE ACTION
1. STARTER MOTOR DOES NOT TURN - HIGH CURRENT DRAW .
Step 1. Check starter for grounded switch , terminals , or field ( paragraph 5-2 ) .
Replace any grounded component .
Step 2. Check for frozen armature shaft bushing ( paragraph 5-2 ) .
Replace bushing and , if necessary , armature .
2. STARTER DOES NOT TURN - NO CURRENT DRAW .
Step 1. Check for open armature windings ( paragraph 5-2 ) .
Replace
armature
if
necessary
.
Step 2. Check for open starter field windings ( paragraph 5-2 ) .
Replace
field
windings
if
necessary
.
Step 3. Check for broken or weak brush springs ( paragraph 5-2 ) .
Replace
brush
springs
if
necessary
.
Step 4. Check for worn commutator ( high mica ) ( paragraph 5-2 ) .
Refinish commutator or replace armature ( including commutator ).
3.
SLOW
STARTER
SPEED
.
Step 1. Check for dirty commutator ( paragraph 5-2 ) .
Clean or refinish commutator .
Step 2. Check for worn armature shaft bushings ( paragraph 5-2 ) .
Replace bushings and , if necessary , armature .
Step
3. Check
for
burned
solenoid
contacts
(
paragraph
5-2
) .
Replace
solenoid
.
Step 4. Check for open or shorted starter field windings ( paragraph 5-2 ) .
Replace
windings
if
necessary
.
Step 5. Check for shorted generator stator windings ( paragraph 8-2 ) .
Replace
stator
windings
.
Step 6. Check for worn generator end bearing ( paragraph 8-2 ) .
Replace
bearing
if
necessary
.
Step 7. Check for worn engine crankshaft , rod , and camshaft bearings ( paragraph 7-17 ) .
Replace bearings as necessary . Repair or replace other worn components
as
necessary
.
2-6