Troy Bilt Horse Forward Interlock Safety Switch - MyTractorForum.com - The Friendliest Tractor Forum and Best Place for Tractor Information
 
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post #1 of 9 Old 10-20-2018, 01:59 PM Thread Starter
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Troy Bilt Horse Forward Interlock Safety Switch

Hi! Maybe a few people here might remember back to earlier this year when I posted on my journey to rebuild my Troy Bilt Horse tiller that was a basket case. Look back a few pages to ďTroy Bilt Horse Basket CaseĒ if your interested. Part of my many problems in rebuilding this tiller was dealing with NLA parts and one of these was the Forward Interlock Safety Switches. Now I figured out how to by-pass these switches and simply install a ďdead manĒ toggle switch to kill the motor. Others here on the forum thought I was committing a mortal sin by not having these safety interlock switches. I figured for many years old Horse tiller's didnít even have these safety devices so I would rebuild this tiller without this safety devices and I'd be okay, to each their own as the saying goes. Yet, it still bugged me that I was so close to having this tiller stock and all it was missing was these switches.

I was lucky that a fellow forum user here had these safety switches from I assume a tiller he was junking and sold me the assembly of micro-switches for the handlebars, the infamous plunger switch, and its associated wiring harness. Now the old micro-switches on tiller I rebuilt I was able to fix by very carefully cutting them open and cleaning the corroded contacts but the new used ones I bought were much better condition. The problem part on both my old Forward Interlock Safety Switches was the switch that sits above the spring plunger. This part to is NLA and to make matters worse itís a plunger type switch that makes or breaks which nine times out of ten gets so corroded that the plunger sticks or the wire going to the shaft of this little plunger switch corrodes in two. To add even more insult to injury Troy Bilt in there infinite wisdom engineered or sourced out this bolt type switch that has pipe threads not machine threads so if you think you can make one you better be one skilled machinist!

The new used plunger switch I obtained also had the plunger corroded (frozen in this weird bolt it sits inside in) so what to do? I decided to whip up a batch of my magical corrosion killer which is a 50/50 mix of Acetone and ATF (automatic transmission fluid) that beats Kroll, PB Blaster you name it IMHO. Plopped the whole switch down in a Mason jarof this mixture and hit the road on a month-long camping trip. When I came back I pulled it all out and with a drift I gently tapped, tapped, the center switch shaft button in the bolt and it broke free! Yet it was still very sticky and not freely operating so I needed to get the switch farther apart so I could clean out more of the corrosion. Thatís when I noticed the bolt head has little indents that hold a plastic top over the wire going into the shaft of this switch. By gently prying those back I was able to get to the top of the switch where this wire makes or breaks on a ring connector to the shaft of the switch. More soaking and then cleaning I was then able to totally free the whole switch up and get it operating. Installed the plastic top in the bolt head and sealed it with Silicon RTV so no water will never get into it and now I have a fully functional plunger switch. Now all thatís left is repairing one broken plastic holder that a micro-switch goes inside that fits into the handlebar and finding somewhere a replacement spring for one that completely corroded away that keeps the handlebar switch lever open.

Iím not sure if I will ever use this Forward Interlock Switch assembly in my tiller but I wanted to see if it can be repaired and maybe help others who want to repair these safety device and show them it can be done. Sorry this post is so long and my photo is so bad but it will show you the problem switch Iím writing about.
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post #2 of 9 Old 10-20-2018, 02:23 PM
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Re: Troy Bilt Horse Forward Interlock Safety Switch

Congratulations on the fix and keeping the tiller stock!

I figured for many years old Horse tiller's didnít even have these safety devices...

I was thinking about that today as I tilled the garden with the Pony and walked along beside the machine... if I slipped or just let go it would merrily go along until it hit an immovable object!

tom
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post #3 of 9 Old 10-21-2018, 08:54 AM
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Re: Troy Bilt Horse Forward Interlock Safety Switch

Hey glad that the switch worked out I thought it was going to be hard to fix.
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post #4 of 9 Old 10-23-2018, 06:46 PM Thread Starter
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Re: Troy Bilt Horse Forward Interlock Safety Switch

warburtonplayer, it just took time for the switch to soak in my special sauce and some patience on figuring out how it was put together. Moonhare, thanks, I still have a "deadman" switch on the tiller which is a simple toggle switch conveniently mounted that grounds the magneto when switched on so it won't run away.
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post #5 of 9 Old 11-02-2018, 07:18 PM
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Re: Troy Bilt Horse Forward Interlock Safety Switch

Awesome job! I wish my dad wasn't retired, I'm sure he could whip up a batch of those in no time.

Mike



TRACTORS:
2005 Craftsman GS6500 (2010 Kohler Courage): JB Jr, electric sleeve hitch
2003 Husqvarna GTH2548 (2014 Briggs Intek): Craftsman 46-inch snowblower

OTHER (NOTABLE) EQUIPMENT:
2013 Honda HS1332TAS tracked snowblower
American CLS 40TC24-200 Logsplitter (2019 Predator 301)
1997 Troy Bilt Horse PTO: tiller, chipper/shredder
Stihl Kombi KM130R: string trimmer, mini cultivator, bed edger, pole saw
Echo PB751T backpack blower
Husqvarna 350 chainsaw

RETIRED TRACTORS:
2003 Craftsman GT5000 (all used up)
2003 Craftsman DLT3000 (all burned up)
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post #6 of 9 Old 11-02-2018, 07:34 PM
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Re: Troy Bilt Horse Forward Interlock Safety Switch

Weíve got a Troy Bilt horse and also had the wood splitter that goes with it. A couple weeks ago I converted the splitter to a fast hitch and added an engine. Much easier to move around now.



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post #7 of 9 Old 11-02-2018, 09:13 PM
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Re: Troy Bilt Horse Forward Interlock Safety Switch



Nice setup!

Mike



TRACTORS:
2005 Craftsman GS6500 (2010 Kohler Courage): JB Jr, electric sleeve hitch
2003 Husqvarna GTH2548 (2014 Briggs Intek): Craftsman 46-inch snowblower

OTHER (NOTABLE) EQUIPMENT:
2013 Honda HS1332TAS tracked snowblower
American CLS 40TC24-200 Logsplitter (2019 Predator 301)
1997 Troy Bilt Horse PTO: tiller, chipper/shredder
Stihl Kombi KM130R: string trimmer, mini cultivator, bed edger, pole saw
Echo PB751T backpack blower
Husqvarna 350 chainsaw

RETIRED TRACTORS:
2003 Craftsman GT5000 (all used up)
2003 Craftsman DLT3000 (all burned up)
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post #8 of 9 Old 01-26-2019, 08:28 PM
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Re: Troy Bilt Horse Forward Interlock Safety Switch

Farmall Super A ? thanks; sonny

http://machinebuildersnetwork.com/
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post #9 of 9 Old 04-26-2019, 09:17 PM
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Re: Troy Bilt Horse Forward Interlock Safety Switch

Sorry Sonny, just saw this. Itís a Farmall 140. 1970 model.
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