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STARTER CHECKING AND SERVICE.
Remove nuts
at both ends of the starter and take off rear end cap.
CHECK BRUSHES.
Before removing the armature,
check brushes for wear. Make sure brushes are not
worn to the point where the brush wire bottoms out
in the slot of the brush holder. Brush springs must
have enough strength to keep tension on the brushes
and hold them against the commutator.
If brushes need replacement, remove by unhooking
the terminals or cutting the connections and then
resoldering. If the brush card is warped from overheating,
replace the card assembly.
TROUBLESHOOTING STARTERS.
STARTER DOES NOT FUNCTION.
Check for:
1. No current to the starter caused by faulty connections
or blown circuit breaker.
2. Faulty safety switches, ignition, starter switch, or
solenoid.
3. Engine locked up or parasitic load on engine.
4. Shorted, open, or grounded field coil.
5. Open, shorted, or bent armature.
6. Brushes sticking or damaged.
7. Dirty or oily brushes or commutator.
STARTER CRANKS ENGINE SLOWLY.
Check for:
1. Parasitic load or tight engine.
2. Worn brushes or weak brush springs.
3. Dirty, oily, or worn commutator.
4. Worn bearings in cap assemblies.
5. Defective armature.
STARTER SPINS, ENGINE DOES NOT CRANK
. Check
for:
1. Pinion gear sticking on shaft.
2. Damaged pinion or flywheel ring gear.
CHECK FIELD.
Using a continuity light or ohmmeter,
check the field by attaching one lead to each field coil
connection. Continuity should exist between these two
points. Check continuity between each field coil
connection and the starter housing. No continuity should
exist.
ARMATURE CHECK.
If the commutator bars are glazed
or dirty they can be turned down on a lathe. While
rotating, hold a strip of 00 sandpaper lightly on the
commutator, and moving it back and forth. (Do not
use emery cloth). Recut the grooves between the
commutator bars to a depth equal to the width of the
insulators.
FIELD COIL
CONNECTORS
CONNECTION POINTS
OF POWER CORD LEADS
Use a continuity tester to make certain no continuity
exists between the commutator (copper) and the iron
core of the armature, rotate armature and check out
all commutator bars.
The armature can be thoroughly checked with a growler
if available.
Summary of Contents for AH520 -
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