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Discussion Starter #1
New to this forum and looking for some help.
I have owned an F911 for a couple years and started to have trouble last fall with the electrical system not allowing the PTO (electric) to engage. I figured out that the actuating switch that is depressed when throwing the PTO lever in gear was "burned out" so I replaced it and continued to use the mower flawlessly last fall. This spring all was good for the first few mowings, then suddenly, the same switch failed again. Thinking the new switch I put on last fall may have been bad, I picked up another new switch, swapped it out and went right back to mowing. This one lasted only about two hours and failed again. Doing some further investigation, I figured out that there are three of these same switches all in a series that allows to PTO to engage, one is under the seat, one is connected to the master brake, and the third one is the one that continues to give me trouble. I checked all of the connections and condition of the brake switch and all looks well there but upon investigating the wiring harness going to the seat switch, I discovered the seat switch had been bypassed (wires jumped together). The bypass job was a little sketchy and I found several spots where the wires had been rubbed bare and could have been shorting out, so I cleaned up the mess, cut back the wiring harness and did a better job of bypassing the seat switch. I thought this may have been the cause of the burned out switch so again I replaced it with a new one and this time it took just about 1/2 hour for this new switch to fail, again....
So, I did more wire tracing and found a connection problem where the "Brain Box" plugs into the wiring harness - part of the connection plug looked melted and one of the wires was loose in the back of the connector - so I ordered a new brain box, installed it, put in another new actuator switch and gave it a go. This time the new switch failed within 10 minutes.
Next thought was possibly a faulty voltage regulator. Picked one up, installed it, put in yet another new actuator switch and mowed about 15 feet before this new switch failed again.
I am running out of ideas of things to try.
Any ideas would be welcome.
 

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Do you have 12v at the pto? Or if its working, check for power at the pto when it fails again. The pto, like all inductive loads, the windings sometimes only open after running up to temp and thus sometimes work and then fail. Sounds like there's a bunch of issues, but how do you know your switch keeps failing?

Don't forget to pull the plug wires before turning the ignition on to test, and blah blah safety this and that...

Grab your meter, let us know what you find. :munch:
 

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PTO clutch is drawing too many amps. You can check by unhooking the wires. Do a resistance check thru both wires to clutch. You should see some resistance. If you get a low number, under 5 or 0, you need to replace clutch. Common problem with electrical clutches.
 

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Discussion Starter #4
Thanks for the advise. I guess I have been trying to avoid the idea that the PTO clutch may be on its last leg.

Rick

(Will update with results)
 

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If you find a faulty pto clutch, might wanna check bearing 48. If that's going/gone out it could've damaged your pto by heat...
 

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