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Thread Tools | Display Modes |
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#11
12-15-2010, 08:28 PM
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If I understand this correctly, when you manually activate the pto sw, you are connecting E to A to B circumventing the need for seat sw & pull in coil 85-86,---- as the power is going to E-A-B-pto or am I missing something?
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#13
12-15-2010, 10:19 PM
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Quote:
 Of your wiring please.
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#14
12-15-2010, 10:44 PM
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It looks to me like the diagram is right. I think one small detail that is missing is that the Seat Switch is an NO (Normally Open) switch, meaning, when you're sitting int he seat, it is open, therefore NOT completing the circuit from the PTO switch to ground. And if you are not going in reverse and you turn on the PTO switch, you are completing the ciruit from the ignition THROUGH the PTO to ground. But keep in mind that the PTO has relatively high resistance, so electricity is only going to flow through there if it absolutely has to. That si why the wire that goes from "B" to the PTO also goes to the Relay. Notice that the relay is also connected to the Reverse Switch which is NC (Normally Closed) which in turn causes the armeture in the relay (represented by the horizontal bar) to not touch the wire that is going to the PTO. But, if you were to put the tractor in reverse, which would then OPEN the Reverse switch, the armeture woudl "spring" into action connecting the wire from the PTO straight to ground, and since the relay has almost no resistance, and the PTO has a lot of resistance, the electricity is going to flow through the relay to ground, rather than through the PTO, effectively shutting off your PTO. Is that about as clear as mud now?!
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#15
12-16-2010, 07:01 AM
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On my diagram, I offer three things for clarity.
(A) The Seat Switch is Normally Open (NO). It closes when someone sets in the seat. The PTO will not run if no one is sitting in the seat. (B) The Reverse Switch is Normally Closed (NC) when the shift lever is in the Forward Position. When the lever is moved into the reverse position, the circuit is opened. Thus, the PTO will not run when the tractor is in the reverse mode of operation (C) The "E" terminal on the PTO switch is a "start circuit" and is only a Momentary Contact (MC) part of the switch. It is spring loaded. See Attachment.... The above items are designed into the circuit to meet Federal Safety Standards. I am sorry for the confusion  I assumed that was understood.
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[B]Roland Bedell[/B] CC Models: 100, 105, 1450, 782, (2) 784, & 2072 [SIZE="4"][B][COLOR="Red"]Buy:[/COLOR][COLOR="Blue"] Made in the USA[/COLOR][/B] [/SIZE]:American Flag 1:
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#16
12-16-2010, 07:42 AM
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Gotcha, so I had the sitting and reverse parts of the switch confused. Thanks for the clarification.
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#17
12-16-2010, 08:58 AM
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Quote:
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#18
12-18-2010, 01:30 AM
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Thanks roland for clearing things up. I didn't realize that the e contact on the pto switch was a momentary one. now it all make sense. Also them calling it a start circuit confused me too. I would call it a holding circuit. Once the coil is energized , it holds the contacts close.
Thanks for all your time and effort jim
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