Service Manual

ELECTRICAL
8 - 8 Mid-Size Walk Behind Service Manual
Disconnect the clutch from the wiring harness. Set a
voltmeter on DC volts and connect the probes to the
terminals at the end of the harness (Figure 227).
Figure 227
mvc-894x
Start the engine and run at full speed. The voltage
reading should match the open circuit voltage
specifications for the alternator on that engine. If the
voltage is the same the wire harness and switches are
good. A voltage drop indicates a poor connection or a
failed switch between the alternator and clutch
terminal.
Electric Start Models
Perform the tests on the clutch as shown previously.
On electric start models the clutch is powered by both
the battery and alternator.
If there are no starting complaints, the battery is likely
good. If there have been starting complaints, use a
known good battery.
With the engine off, turn the key to run and engage the
clutch switch. There should be battery voltage to the
clutch and the clutch should engage. If it does, the
wiring, switch and clutch are all good. If not test the
individual components using the procedures provided.
Turn the clutch off. Connect a DC voltmeter to the
battery terminals and note the voltage. Start the engine
and run at full speed. If the voltage rises, the alternator
is good. If the voltage does not rise, test the alternator
per the engine manufacturers specifications and the
wiring between the alternator and battery.
Clutch Burnishing Procedure
The clutch should be burnished as part of the pre-
delivery service, or whenever a new clutch is installed.
Burnishing polishes the clutch plate, allowing for
smooth clutch engagement.
With deck drive belt installed, run the engine at half
throttle. Engage and disengage the mower 5 times (10
seconds on/10 off).
Increase engine RPM to 3/4 to full throttle. Engage
and disengage mower 5 times (10 seconds on/
10 seconds off).
Check the clutch air gap and adjust as needed. Refer
to "Adjusting the Electric Clutch" on page 8 - 8.
Adjusting the Electric Clutch
The clutch is adjustable to ensure proper engagement
and proper braking. Check adjustment after every 100
hours of operation.
1. To adjust the clutch, tighten or loosen the lock nuts
on the flange studs (Figure 228).
2. Check adjustment by inserting a feeler gauge
through the slots next to the studs (Figure 228).