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MTD 478 Series User Manual

MTD 478 Series
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STARTER AND CHARGING SYSTEMS
46
4. Pull back on the starter approximately 1/2”. Then
angle it away from the engine while sliding it out
of the engine.
See Figure 6.13.
NOTE: Before condemning a starter make sure
to bench test it. To bench test a starter:
A. Remove the starter from the engine.
B. Plug the extension cord into the switch
housing.
C. Hold the starter down and press the starter
button.
If the starter works on the bench, confirm that
the engine crankshaft rotates with normal force.
If the crankshaft does not rotate with normal
force, identify and repair the engine problem.
NOTE: This includes adjusting the valve lash.
If the crankshaft rotates with normal force but the
starter is unable to turn it, replace the starter.
If the starter does not work, replace the starter.
4. Install the starter by following the above steps in
reverse order.
NOTE: Tighten the starter screws to a torque of
195 - 221 in-lbs (22-25 Nm).
Charging system
Description
Some engines are equipped with a charging system.
The charging system consists of:
Alternator stator: The stator consists of copper
field windings around an iron core. The stator is
attached to the engine block beneath the fly-
wheel.
Alternator rotor: The rotor consists of five mag-
nets on the inside of the flywheel that rotate
around a stator that is mounted to the cylinder
block. As the crankshaft and flywheel rotate, the
moving magnets induce a charge in the stator.
See Figure 6.14.
A rectifier: A set of diodes that turn the AC cur-
rent into DC current.
Figure 6.13
Pull back and angle the
starter away while
sliding it out
Figure 6.14
Magnets

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MTD 478 Series Specifications

General IconGeneral
BrandMTD
Model478 Series
CategoryEngine
LanguageEnglish

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