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Massey Harris & Massey Ferguson Tractors Discussion Forum
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Safety switch ???

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phil25

03-12-2006 17:30:43




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Does anyone have a possible of what i will find with the latest "project" dropped off for a shave and a haircut:)
Its a 4 speed massy gas 35? 4 forward /reverse and a "S" for start?
The safety switch has been bypassed, so it starts in any gear,and it goes against my grain to let the machine leave the shop, although it did arrive that way.
The only time the linkage to or at the safety switch moves is in reverse gear,[goes forward] but still doesn't move the actual switch? This is the main starter power, its using a normal soliniod to switch the starter at present.
There is no movement at all towards the "S" position, as if there is no slot for the shifter to move into, can i lift the the shifter mount and possibly see/do anything to fix it?
quite sure owner won't supply any funding for a break apart situation, but it's just not right to not attempt a simple fix if possible. Tks to all.

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Bob N.Y.

03-15-2006 14:40:22




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 Re: Safety switch ??? in reply to phil25, 03-12-2006 17:30:43  
If it has a 4 speed transmission it is NOT a 35. All 35s had a 3x2 tranny for 6 speeds forward. Some of the later ones had Multi-Power for a total of 12 speeds.



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phil25

03-15-2006 17:47:41




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 Re: Safety switch ??? in reply to Bob N.Y., 03-15-2006 14:40:22  
Tks, there are no numbers at all on the rig, more coats of what was avaible in that can of red on the hood/body but it didn't rust he says:)
i and owner can only guess as to what it is, i felt i had better ask about the shifter, and try to give a reference as to what i was talking about.
Got good info from all!



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phil25

03-13-2006 15:14:46




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 Re: Safety switch ??? in reply to phil25, 03-12-2006 17:30:43  
yes ed you make sense of what you described, the contact unit is there and the linkage is there on the underside, but it only moves when i put it into reverse gear. it will go to the right[as if it was going to be shifted into reverse] but not forward to the start position. no indication of a slot or detent, it is a solid no go position.
But when reverse gear is used, the interlock linkage moves, but not enough to operate the contact unit.
The soloniod is an owner modification, not exactly a pretty looking installation or operation, but we do what we can:)
I wasen't sure if i would drop a pin or detent ball when i take the shifter top off, better to ask first
Thanks

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Ed Lotterman

03-13-2006 17:47:40




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 Re: Safety switch ??? in reply to phil25, 03-13-2006 15:14:46  
Yes, if it were mine, I'd go ahead and pull the top cover off the transmission. It has been years - I had farm sale and sold the TO-20s and the TO-30 in 1977, but I had that cover off of one a few different times and there was no linkage or detents or anything like that. I think the first time I did it was when I was 14 years old or so and in a "I wonder what it looks like under this cover" sort of teen-age mechanic impulse, and I took it off. But I learned a lot about how a transmission works and I did not have problems getting the cover back on.

I don't remember the details of how the linkage forward to the switch worked, but if there is some motion of something when you shift to reverse it must be there mostly.

Good Luck!

Ed

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Ed Lotterman

03-13-2006 14:44:20




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 Re: Safety switch ??? -- are other components in p in reply to phil25, 03-12-2006 17:30:43  
I am assuming that the MF 35 had the same system as the TO-20 and TO-30 Fergusons. I had three of those. You can take the top cover off of the transmission with no danger of screwing something up and no problem of replacing. But the starter that came with these did not have a solenoid. There was a heavy 6-volt push button (momentary contact) switch in the top of the clutch housing. A battery cable came down from the battery box to one terminal on this switch and another ran from the second terminal to the starter. The starter was the older type that did not depend on any action of a solenoid to engage / disengage the starter drive.

This switch was removable from the top of the clutch housing by removing one or two bolts and lifting up. If this switch is no longer in place, then you won't be able to restore the safety function. There should be a plunger in the transmission that extends through into the clutch housing to push on this switch when you move the shift lever to the right and forward.

With a newer solenoid-type starter in place, you are still going to need power to the solenoid to actuate it even if you run the battery cable through this safety starter switch. So it will always be sort of a bastardized combination unless you got an original starter.

Again, this is assuming that the MF 35 is identical to the TO-30. We had a MF-50. I never worked on it so don't remember it as well, but I think it did have a solenoid starter actuated by a push button below the steering wheel. You turned a key for ignition and pushed the button to start. There was a safety switch connected to the hi-lo shift lever. That had to be in Neutral just like on my 1974 165. But you did not move the shift lever to actuate the starter.

If anyone has more direct experience with a MF 35 instead of a TO-30 and says I am wrong, believe them!

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Texas Denny

03-13-2006 09:52:47




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 Re: Safety switch ??? in reply to phil25, 03-12-2006 17:30:43  
I have 16 tractors. Only two came with this factory neutral interlock. Both of those are Ford. When the one on my 901 failed, I by-passed it and have no intention of ever repairing it.



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