ELECTRICAL
3. Measure the resistance between each commutator segment
and the armature shaft. The reading should be infinite. (no
continuity)
Voltage Drop Test
The Voltage Drop Test is used to test for bad connections.
When performing the test, you are testing the amount of
voltage drop through the connection. A poor or corroded
connection will appear as a high voltage reading.
To perform the test, place the meter on DC volts and place the
meter leads across the connection to be tested. Refer to the
chart on next page to perform voltage drop tests on the starter
system.
Voltage should not exceed
.1 DC volts per connection
4. Check commutator bars for discoloration. Bars discolored in
pairs indicate shorted coils, requiring replacement of the
motor.
5. Place armature in a growler. Turn growler on and position
a hacksaw blade or feeler gauge lengthwise 1/8〃 (.3 cm)
above armature coil laminates. Rotate armature 360°. If
hacksaw blade is drawn to armature on any pole, the armature
is shorted and must be replaced.
6. Inspect the permanent magnets in starter housing. Make
they are not cracked or separated from housing.
CAUTION
Use care when handling the starter housing.
Do not drop or strike the housing, as magnet damage is
possible. If the magnets are damaged, the starter must
be replaced.
Starter System Troubleshooting
Starter Motor Does Not Turn
• Battery discharged - low specific gravity
• Loose or faulty battery cables or corroded connections (see
Voltage Drop Tests)
• Related wiring loose, disconnected, or corroded
• Poor ground connections at battery cable, starter motor or
starter solenoid (see Voltage Drop Tests)
• Faulty starter button
• Faulty ignition switch (Do other systems function?)
• Faulty starter solenoid or starter motor
• Engine problem - seized or binding (Can engine be rotated
easily with recoil starter?).
Starter Motor Turns Over Slowly
• Battery discharged - low specific gravity
• Excessive circuit resistance - poor connections (see
Voltage Drop Test below)
• Engine problem - seized or binding (Can engine be rotated
easily with recoil starter?)
• Faulty or worn brushes in starter motor
• Automatic compression release inoperative
Starter Motor Turns - Engine Does Not Rotate
• Faulty starter drive
• Faulty starter drive gears or starter motor gear
• Faulty flywheel gear or loose flywheel
Starter Reassembly
1. Place armature in field magnet casing.
2. Inspect and replace the O-rings if damaged.
3. Install case sealing O-ring. Make sure O-ring is in good
condition and not twisted on the case. Lubricate the ends
armature shaft and oil seal with a light film of grease, and
install housing.
4. Install brush housing onto the armature, pushing back
brushes while installing armature shaft.
5. Reinstall starter motor housing screws and washers. Make
sure O-rings are in good condition and seated in groove.
Tighten sufficiently.
6. Reinstall the starter motor to the engine.
8.17
To Next Page
Loading...
Need help?
General
