This section will cover how to evaluate electric clutches.
You will need a multi-meter to perform these tests.
1. To measure the clutch coil resistance, turn off the engine and the PTO switch.
a. Disconnect the clutch wire connection.
b. Set the meter to check ohms.
c. Connect the meter lead wires to the wires in the clutch connector.
- If the meter reads below 2.40 ohms or above 3.40 ohms, the clutch has failed and needs to be replaced.
- If the meter reads between 2.40 and 3.40 ohms, proceed to measuring clutch current draw.
2. Set the meter to check amps using the 10 amp scale.
a. Connect one meter lead wire to one wire in the clutch connector and the other lead wire to the corresponding wire in the mating connector.
b. Connect a short wire to the second wire in both connectors.
c. Turn the PTO switch on.
3. If the meter reads below 3.5 amps, the problem would be in the electrical system leading to the clutch such as the battery, a relay or a switch.
4. If the meter reads 3.5 amps or above, proceed to checking the air gap.
a. Turn off the PTO
b. Locate the three windows or notches where the air gap is checked.
c. Check the gap at three locations using a feeler gauge.
d. The factory air gap settings is .010 to .025 inch.
e. If the gap is incorrect, use a .017 feeler gauge and adjust the gap by tightening or loosening the three nuts on the clutch.
5. The electric clutch initially needs to be burnished before it is used by the owner.
It is not only done at the factory and is the responsibility of the dealer or the customer.
a. To properly burnish the clutch, run the engine at 50 percent throttle.
b. Engage and disengage the clutch 5 times, ten seconds on and ten seconds off.
c. Increase to 75 percent throttle.
d. Engage and disengage the clutch 5 more times, ten seconds on and ten seconds off.
6. If you have a unit with an electric clutch that operates sporadically, check all wiring around the steering column going to the dash for fraying and shorts.
a. Check the relays for proper connections. Newer models have in line relays to minimize vibration and reduce failure.
b. You can remove the relays from the chassis of older models and tape them directly to the wiring harness.
c. Check the PTO switch for proper connections. The red and blue wires might be reversed. The blue wire
should be on top with the red wire directly below it. The brown wire should be on the opposite side.