Info on Toro Safety Interlock switch/relay - Snowblower Forum : Snow Blower Forums
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post #1 of 19 Old 01-06-2020, 09:50 PM Thread Starter
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Exclamation Info on Toro Safety Interlock switch/relay

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Originally Posted by Grunt View Post
Hey Brother Todd, does that briggs have the notorious interlock module on it? I would like to do a post mortem on one and try to see how they work so new ones could be made once the internal parts are identified.

Just wondering, are you referring to the safety interlock levers under the handgrips, or to the limit switch for neutral, or everything? From what I remember the 726 plastic under the levers was a bit different from the later 826 plastic but I don't see a limit switch on the 726 parts diagram...


There's also an stop "interlock" - I hate to call it that - (#297472) on the engine at the governor control plate (#390670) that grounds the magneto when the throttle lever is moved far enough towards slow.


Again, just wondering, thanks.
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post #2 of 19 Old 01-06-2020, 11:19 PM
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Originally Posted by AnOldGearhead View Post
Just wondering, are you referring to the safety interlock levers under the handgrips, or to the limit switch for neutral, or everything?

It is the round cylinder mounted on the lower left side of the motor below the carb that connects the other switches to the mag kill wire. It senses if the auger switch is active or the trans is in gear and kills the motor if the hand grip is released. It is NLA new and used ones are rare and expensive to purchase without knowing if they still work as they should. They can be by-passed which disables the few safety feature there were.
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Toro 8/24 (38080) 1989
Toro 721-QZR (38743) 2015 (Hemi Predator Power)
Toro (51984) Hand Held Blower (For the light stuff)

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post #3 of 19 Old 01-07-2020, 01:34 PM
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Garage
Gave you guys your own thread as hopefully more Toro enthusiasts will see it.

I think I have one of these on one of my JD blowers but it's resin filled so you can't take it apart to look see. I'll have to go check.
It should just be a relay but cracking open that case would be the way to go to find out.

.

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post #4 of 19 Old 01-07-2020, 05:59 PM
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Quote:
Originally Posted by Grunt View Post
It is the round cylinder mounted on the lower left side of the motor below the carb that connects the other switches to the mag kill wire. It senses if the auger switch is active or the trans is in gear and kills the motor if the hand grip is released. It is NLA new and used ones are rare and expensive to purchase without knowing if they still work as they should. They can be by-passed which disables the few safety feature there were.
HEY' BROTHER GRUNT!!!!!!!!!! You want that old switch. I still have it??????????

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post #5 of 19 Old 01-07-2020, 06:31 PM
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Quote:
Originally Posted by POWERSHIFT93 View Post
HEY' BROTHER GRUNT!!!!!!!!!! You want that old switch. I still have it??????????

Hey Todd, PM sent.

Toro 8/24 (38080) 1989
Toro 721-QZR (38743) 2015 (Hemi Predator Power)
Toro (51984) Hand Held Blower (For the light stuff)

Experience is something you don't get until just after you need it.
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post #6 of 19 Old 01-07-2020, 06:41 PM
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Quote:
Originally Posted by Kiss4aFrog View Post
Gave you guys your own thread as hopefully more Toro enthusiasts will see it.

Thanks Mark, appreciate it. A relay would need power to operate, so I'm guessing a transistor or a couple diodes will be inside. Opening the case and gentle use of a Dremel should work if different solvents don't dissolve the resin.

Toro 8/24 (38080) 1989
Toro 721-QZR (38743) 2015 (Hemi Predator Power)
Toro (51984) Hand Held Blower (For the light stuff)

Experience is something you don't get until just after you need it.
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post #7 of 19 Old 01-08-2020, 01:05 AM
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Quote:
Originally Posted by Grunt View Post
Thanks Mark, appreciate it. A relay would need power to operate, so I'm guessing a transistor or a couple diodes will be inside. Opening the case and gentle use of a Dremel should work if different solvents don't dissolve the resin.
Personally,I don't see any need for active components inside that device-no relay is needed.I think it's acting as a terminal or plug block for the connector for the wiring.It's basically the same thing as a lawn tractor safety system for the seat and PTO-no power needed.


I think it acts merely as a way to keep things tidy and wiring the rig at the factory quicker and easier.


Does this blower actually have a relay?I guess that the real question.I've never seen one of these blowers with that safety system,but I can't fathom the need for a relay just to do something as easy as killing the ignition with a few switches.
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post #8 of 19 Old 01-09-2020, 09:33 PM Thread Starter
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Quote:
Originally Posted by Grunt View Post
It is the round cylinder mounted on the lower left side of the motor below the carb that connects the other switches to the mag kill wire.
Thanks, my 826 model #38150 826 doesn't have one nor does the 726 model #31756 that I've seen so I don't know if it was originally on newer or originally was on older machines. I'm guessing that it was added on newer machines after Toro figured out how to use or make a proprietary part, or maybe this whas cheaper than using limit switches. It would be interesting to know the continuity and resistance between the 3 connections...


Quote:
Originally Posted by Kiss4aFrog View Post
Gave you guys your own thread as hopefully more Toro enthusiasts will see it.
Thanks!
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post #9 of 19 Old 01-09-2020, 11:04 PM
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Quote:
Originally Posted by AnOldGearhead View Post
Thanks, my 826 model #38150 826 doesn't have one nor does the 726 model #31756 that I've seen

The parts list for the 826 shows the module, the 726 only shows the gear selector safety switch.

Toro 8/24 (38080) 1989
Toro 721-QZR (38743) 2015 (Hemi Predator Power)
Toro (51984) Hand Held Blower (For the light stuff)

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post #10 of 19 Old 01-12-2020, 06:24 PM Thread Starter
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The 826 and 726 machines I had in mind didn't have that. The 826 interlocks work fine but I still need to go through the 726.
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