Starter Motor Troubleshooting; Drive Assembly Service; Armature Check - Tecumseh SPECTRA 37 Service And Repair Manual

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STARTER MOTOR TROUBLESHOOTING

STARTERS
STARTER DOES NOT FUNCTION
Check for:
- No current to the starter caused by faulty connections
or dead battery.
- Faulty safety switches, ignition or starter switch or
solenoid.
- Engine locked up or parasitic load on engine.
- Shorted open or grounded field coil.
- Open, shorted or bent armature.
- Brushes sticking or damaged.
- Dirty or oily brushes or commutator.
STARTER CRANKS ENGINE SLOWLY
Check for:
- Battery discharged or weak.
- Parasitic load or "tight" engine.
- Worn brushes or weak brush springs.
- Dirty, oily or worn commutator.
- Worn bearings in cap assemblies.
- Defective armature.
STARTER SPINS, ENGINE DOES NOT CRANK.
Check for:
- Pinion gear sticking on shaft.
- Damaged pinion or flywheel ring gear.

DRIVE ASSEMBLY SERVICE

Pinion gear parts should be checked for damage or wear.
If the gear sticks on the shaft it should be washed in
solvent to remove dirt and grease and dried thoroughly. If
damaged, replace parts.
The unit is disassembled by removal of the two end cap
screws, the bendix gear is secured by a snap ring at the
shaft end.
If starter is sluggish in operation, remove end cap and
check condition of armature and brushes; if brushes
require replacing the complete end cap must be replaced.
(Fig 32).

ARMATURE CHECK

If commutator bars are glazed or dirty, they can be turned
down in a lathe. While rotating hold a strip of "00" grade
abrasive paper lightly on the commutator, moving it back
and forth. Do not use emery cloth. (Fig 33).
Recut grooves between commutator bars to a depth equal
to the width of the insulators.
Using a continuity tester to make certain no continuity
exists between the commutator (copper) and the iron of
the armature. Rotate armature and check all commutator
bars (Fig 34).
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Fig. 32
Fig. 33
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