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Harry Ferguson Tractors Discussion Forum
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Safety switch Mech. Question.

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Jeff-oh

05-03-2005 15:40:27




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On my TE-20 the transmission safety switch has been by-passed. The wires run from a key switch to a push button starter switch mounted on the dash.

I would like to return it to the origional configuration. However, I do not want to dismantle what works and experiment.

Thus: How can you check if the safety starter switch is good? I put a continunity meter on both terminals and engaged the trans. lever. No reading.

Are these switch fairly easy to pull out to work on? I have read in my shop manual about consern of dropping the attach lever down into the transmission housing. (yes I am being chicken)

Or is it most likely an out of adjustment that some one fixed with a push button switch rather than a true fix.

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John(UK)

05-06-2005 12:54:46




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 Re: Safety switch Mech. Question. in reply to Jeff-oh, 05-03-2005 15:40:27  
The Starter switches on the TE series is different to the TO Tractors. if you slacken the setscrews holding it to the clutch housing it will slide back and forward slightly to allow for adjusting it, possibly that could be all that is wrong. If the switch still doesn't work just remove the screws and lift it up and you will see the rod attached to it, so tie a piece of string to it so you cant lose it in the clutch housing, then pull the pin on the starter switch. You could then take the switch apart and clean the contacts and see if you can fix it that way, if not you can buy a new switch as was fitted to it originally.

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Paul (FLA)

05-05-2005 09:58:35




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 Re: Safety switch Mech. Question. in reply to Jeff-oh, 05-03-2005 15:40:27  
I pulled my switch off, and there was no mechanism from the shifter plate attached. It must have fallen inside somewhere. Any advice on retrieving it?

Paul



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John(UK)

05-06-2005 12:58:07




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 Re: Safety switch Mech. Question. in reply to Paul (FLA), 05-05-2005 09:58:35  
Paul if your tractor is a TO model it wont have any mechanism to the switch, it is all self-contained in the top of the clutch housing and the switch just drops in. If it is a TE model the you will have to go fishing or take the engine out.



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John(UK)

05-04-2005 14:07:54




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 Re: Safety switch Mech. Question. in reply to Jeff-oh, 05-03-2005 15:40:27  
If you take the switch out, before you pull the pin in the rod, simply tie some string around the rod and then you can't lose it, no problem. the Switch will adjust by sliding it back-wards and for-wards as it has elongated fixing holes. The rod may not be just pulling it quite far enough to switch it on, so slacken the 4 setscrews holding it to the top of the clutch housing and slide it slightly back towards the seat and try it again. If it still doesn't work you can take it apart, it could be riveted, depending how old it is, once you cleaned the contacts then use some small screws to hold it together, then refit it. You can still get these switches, It is available from this site (top of the page) MF part number 829960M91 or 42538S which is Sparex S42538 if you go to your local tractor dealer.

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Glenn/Calif

05-03-2005 19:44:17




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 Re: Safety switch Mech. Question. in reply to Jeff-oh, 05-03-2005 15:40:27  
Jeff: Had the same problem with my TO20 saftey switch. That was before reading the archives. I took out the switch (held on by two cap screws) and cleaned it with an ignition file and Berryman Break Clean. Checked it with a multimeter and had good contact. put it back in and it works like a champ. When you take it out it looks like the foot switch on my old Model A Ford, but shorter. I'm an old guy and find when working on these older thing it helps to think like an old guy, when it comes to the newer things I defer to my son-in-law and my daughter, the New-Age mechanics. Jeff, just GO For It. it'll be ok.

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nonac99

05-03-2005 19:30:57




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 Re: Safety switch Mech. Question. in reply to Jeff-oh, 05-03-2005 15:40:27  
My TO-30 switch stopped working. I was able to pull it out, take it apart and fix it. Looking at the parts area of this websight I see that the TE starter switch looks different than the TO. On the TO there was really nothing to worry about dropping, the switch came right out and I was able to exercise the shift lever and check that it would activate the button that was on the switch. For 22 dollars, you could have a new switch from this sight so thats one way to go if the switch is bad. On mine, I just had to file off some of the corrosion on the copper contacts inside the switch and now it works great.

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phil(va)

05-03-2005 18:39:32




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 Re: Safety switch Mech. Question. in reply to Jeff-oh, 05-03-2005 15:40:27  
Most likely the orginal switch went bad (they are prone to that) and the owner converted to what he had on hand or could get easily. No trouble to remove the switch and then you can test it easily. As you said, don't drop it, but you won't; it isn't a big deal.



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