Service Manual

Alternator Operation
The alternator is a single coil employing
1/2 wave rectifica-
tion through the use of a diode built into the body
of the
alternator. The alternator also uses a capacitor in parallel
with the output for electrical filtration. The diode can be
checked with a ohmmeter by alternately placing the posi-
tive and negative leads on the connections
to the diode.
See Figure
48. The diode should conduct in one direction
and block
in the other.
.
ALTERNATOR.
ASSEMBLY
ALTERNATE +/-
.
, Figure 48
Alternator Removal (if installed)
1. Remove the two 5/16" hex, washer head cap screws
retaining the alternator. See Figure
49.
. .
Figure 49
GTS150 33
2. Remove the alternator.
Flywheel Removal
1. Remove the 15/16" hex nut retaining the flywheel
starter cup. See Figure
50.
Figure 50
2. Remove the starter cup and reinstall the flywheel nut
to protect the threads on the end of the crankshaft.
3. Install Briggs and Stratton flywheel puller 19203 as
shown in Figure 51 and remove the flywheel. The
holes in the flywheel are not tapped and require the
use of the self tapping screws included
with the
flywheel puller. Alternately tighten the screws on the
puller until the flywheel breaks loose.
.-
Figure 51
4. Remove the flywheel and examine the condition of the
flywheel key. Replace the key if necessary.
Electric Starter Operation
The electric starter is a
12 volt DC universal motor using
a
14:l gear reduction to drive a composite spur (pinion)
gear through a helical drive shaft. When the motor is
started the rotation
of the helical shaft causes the pinion
gear, through inertia, to engage the ring gear on the
Engine