For models with serial numbers above 10,000 when the ignition switch is in the run position and with the steering switch in the neutral (engaged), position power is supplied to terminal 86 of the start relay and to terminal 30 of the PTO relay. Engaging the seat switch starts the hour meter and energizes the start relay. The start relay when energized provides a ground to the PTO relay. Now engaging the PTO switch will engage the PTO clutch.
STEP 4
With ignition switch in the start position, battery voltage is transferred from terminal B to S. Terminal S transfers battery voltage through the PTO switch (disengaged) the neutral switch (engaged) and to the starter solenoid relay which powers the starter solenoid.
PTO clutch check out: Remove the wiring harness PTO clutch leads from the clutch. With a multimeter check the clutch coil for resistance to see if the coil is good.
The clutch used should have a coil resistance according to the table below. If the coil is bad there will be no resistance or it will be higher.
Part Number | Ohms (± 5%) |
001917002.84
036431003.68
049154002.45
Ignition switch check out: Battery voltage check in the "off" position, check for voltage at terminal B. It should not be present on terminals A, S, L.
With the ignition switch in the "run/light" position, check for battery voltage at terminal B, A, L, Y. It should not be present at terminal S.
With the ignition switch in the "run" position, check for battery voltage at terminals B and L.
With the ignition switch in the "start" position, check for battery voltage at terminals B, L, S.
PTO switch check out: The PTO switch is a push/pull switch with normal open and closed contacts. Power transfer should be checked with a voltmeter. The switch contacts should be checked with an ohm meter with the wire harness plug removed. The light switch is similar to the PTO switch with only one set of contacts.
Diode check out: Diodes are checked with an ohm meter set on the diode check, and should only pass voltage in one direction. If it passes voltage in both directions or not at all the diode is bad and needs to be replaced.
Measurements For Models With Serial Numbers Above 10,000 |
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Key Switch | Off | Run | Start |
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B | |||
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A |
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S |
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L |
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Contact resistance is |
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Seat Switch | Off | Run | Start |
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Red/Yellow |
| Connected to Ground through test switch | |
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Black |
| Connected to Ground |
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Normally open contacts manually activated. contact resistance is
11 - 37