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I have a Toro LX 500 Lawn tractor the pto clutch will not engage, I have 13 volt at the plug for the clutch , so ordered and installed new clutch... Still will not engage checked volts again had 9.3

Not sure if it could be the pto switch or ignition switch or in one of the safety switches.. Can you please help me with this problem ???

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Load test the PTO circuit as it may a connection that allows you to a voltage reading when unload and then once loaded drops out.

By load testing I mean leave the PTO clutch coil attached and test while it should be engaged.

Posted on Apr 22, 2015

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  • Expert
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PTO Clutch will not stay engaged.
There is a very fine one page discussion on evaluating electric clutches at this site:

http://www.messicks.com/Articles/FixingElectricClutch.aspx

My JD tech manual, which covers the entire LA 100 series, agrees with the electrical specifications. It states that the Electric PTO Clutch should show the following:

  • Resistance 3.7 ohms
  • Current Draw 3.25 amps.
It does not give the air gap. It does include a note to check the PTO Clutch Key for damage or if missing. So there is a drive key between the PTO Clutch and the shaft. Additionally, it recommends checking the tightness of the cap screw. That's the screw or bolt that holds the clutch on the shaft.
  • Cap Screw torque 55 lb-ft (75 N.m).
Fixing Electric Clutches

Posted on Apr 22, 2015

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Posted on Jan 02, 2017

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SOURCE: 325 lawn tractor,pto will not engage.clutch is ok and new switch installed. No 12 v to cluch when sw is engaged.

what switch did you replace the one that turns it on or the safety switches in the middle of the circuit?

Posted on Apr 13, 2012

radco855
  • 126 Answers

SOURCE: Can malfunction of PTO or other safety switches prevent start up of mower

You didn't state the model or brand of tractor, but usually the way the cranking circuit work is, from the "S" terminal of the ignition switch, the circuit runs to the PTO switch, if it's in the OFF position, the circuit then runs to the pedal switch, if it's in the DOWN (or brake on) position it then runs to the solenoid. On other tractors, from the ignition switch, the circuit runs to the pedal switch first. (The seat switch isn't used in the cranking circuit).

Any switch can go bad, but I would more likely suspect the pedal switch or loose connection at either switch. (But it could actually be the PTO switch).

Try tracing the circuit from the "S" terminal of the ignition switch through the PTO or pedal switches to the starter solenoid. You may get lucky and find something obvious.

If you find nothing, try jumping across the pedal or the PTO switch (only two terminals are used in the cranking circuit, trace back to ignition switch for the incoming, outgoing is usually directly adjacent). Jumpering will take these out of the circuit and tell you if either is bad internally.

Lastly, there's always the possibility that the ignition switch is bad. (Doesn't happen all that often, but it's suspect as well). Jumper from "B" terminal to "S" terminal will take it out of the circuit.

Posted on Aug 22, 2012

  • 1 Answer

SOURCE: electric PTO does not engage on garden tractor

Its a torro Timecutter z4202

Posted on Nov 17, 2014

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