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Starter solenoid on SM's

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Idaho Boy

05-12-2008 20:28:53




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Hey y'all...do the M vintage tractors have a starter solenoid or do they function without a solenoid? If they have one, where is it usually located? I don't have one that I know of ...at least not mounted on the starter itself??? Any info is appreciated! Thanks




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Janicholson

05-13-2008 06:17:50




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 Re: Starter solenoid on SM's in reply to Idaho Boy, 05-12-2008 20:28:53  
Letter series never had solenoids or starter relays as OEM. (Key type starting required the change) All Letter series had switches to engage the elecrticity to the starter motor (which had an inertia spiral drive system to put the pinion into the ring gear) A solenoid is a device that is a linear, or partial arc electrical to mechanical device (like a crane magnet picking up steel) Thus the solenoid, that is also correctly called a relay, shaped like an oversized film canister, is an electrical switch powered by a solenoid internally. A solenoid with mechanical connection to the starter pinion, and an electrical switch is a dual purpose solenoid moving both the switch contacts, and mechanical linkage to the starter drive. Ford starters from the early sisties were interesting in that they used the film can looking electrical relay to power the sterter, and a movable pole piece in the windings that slapped into place when the starter got battery volts to push the drive into place through linkage. Purists are able to call them anything but a potato, and be OK with me. JimN

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Red Mist

05-13-2008 05:56:04




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 Re: Starter solenoid on SM's in reply to Idaho Boy, 05-12-2008 20:28:53  
My Super M, #41198 J, has a starter pull rod with a round loop shaped finger grip, right beside the choke rod. It is connected to a manual heavy duty switch mounted on the starter - like Super A's and many other models have. Actually, I have been referring to it as a mechanical solenoid, which may or may not be correct..... mike



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gene bender

05-13-2008 03:12:08




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 Re: Starter solenoid on SM's in reply to Idaho Boy, 05-12-2008 20:28:53  
No solenoid but a push button sw mounted at the base of the steering post was used with a rod type lever assy that you worked with your foot. The switch is a heavy duty type with a large button one side went to the battery and other side went to threaded post on the starter. There are large posts on the bottom for the battery cables.



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edward_m

05-12-2008 21:36:01




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 Re: Starter solenoid on SM's in reply to Idaho Boy, 05-12-2008 20:28:53  
Actually, I think the question was about how the starter Bendix is activated.

Not all M/SM's had a solenoid that activates the starter: some used a heavy duty push button that simply routed voltage directly to the starter, rather than activating a solenoid that then routes the power.

As far as location, it should always be mounted on the starter if you have an original round solenoid. There's a solid metal bar that connects from the output side of the solenoid to the starter (only about 2 inches long). I've seen some tractors with after-market solenoids, but if those are used, you're best bet is to trace the power cable from the battery to see if your tractor has a solenoid or not, as those can be mounted just about anywhere. (I used one on an H, and mounted the unit in the space under the rear gas tank mount.)

Hope this helps.

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Wayne in MN

05-12-2008 20:40:08




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 Re: Starter solenoid on SM's in reply to Idaho Boy, 05-12-2008 20:28:53  
No solenoid; the starter has an inetia drive or may be called a Bendix drive.



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HENRY E NC

05-13-2008 06:13:36




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 Re: Starter solenoid on SM's in reply to Wayne in MN, 05-12-2008 20:40:08  
The push button switch acts as a solenoid. A solenoid usually uses low power to bring higher power contacts together. The push button switch does that mechanically, not electrically. Nuff said Henry



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