Service Manual

Testing Alternator
Battery does not charge during mower
operation:
1. Check battery connections and alternator
connections to make sure they are complete
and secure. Check the connection points at
the battery, alternator wire, key switch and
all ground connections.
2. Measure the alternator output with the
engine at 3000 RPM. With the battery
connected, alternator output should be 13.2
volts DC. The voltage can be measured
between the red wire on the key switch and
the black ground wire.
3. If the measured voltage is 12 volts or less, it
indicates the alternator may not be charg-
ing.
Go to step four.
4. Complete a resistance test on the alternator
coil. This test may be completed without
removing the coil from the engine.
All
measurements are taken between the out-
put wire and ground. Disconnect the wire
for these tests. For clarity, the coil has been
removed in the following figures.
5. The alternator coil is equipped with a diode
assembly that will rectify the alternator
output. See Fig. 3-24.
n
Figure 3-24
6. Check the diode and coil assembly with a
volt-ohmmeter. The meter in Fig. 3-25
indicates a resistance of infinity when a
numeral one appears to the left of the
decimal point. The measurement should be
infinity when the positive probe of the meter
is placed on the output wire. See Fig. 3-25.
The negative probe
is connected to the
ground terminal of the alternator coil.
Figure 3-25
7. Reverse the leads and complete the test.
The measurement is 707 ohms. The meter
was on the 2000 ohm scale and the reading
is .707 or 707 ohms. See Fig. 3-26.
Figure 3-26
Removal Electric Starter
1. Pull the spark plug wire off the spark plug.
2. Unplug the starter connector.
3. Unscrew the two mounting screws as shown
in Fig. 3-32.
4. It is not necessary to take shrouding off the
engine to remove the starter.
5. The serviceable components on the starter
are shown in Fig. 3-27.
6. The pinion is serviceable by removing the
retainer clip and then lifting the components
off the starter motor shaft.
Installation Electric Starter
1. Coat the starter motor worm shaft and pinion
teeth with a light coat of molybdenum di-
sulfide lubricant, Toro part number 505-37.
2. Assemble the starter motor components
as
shown in Fig. 3-27.
3. Install the starter motor and torque the
fasteners to 2.2 3.5 kg-m (16-25 ft-lb).
(Make sure you don’t pinch the alternator
wire under the starter motor.)