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Farmall & IHC Tractors Discussion Forum
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MD clutch hold-out lever

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n9lhm

08-03-2005 09:14:45




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In my M/MD parts book, it shows a little device that bolts onto the front left corner of the transmission cover to hold the clutch in the disengaged position. (Clutch pedal hold-out lever, 63775D)In the description, it says "for MD/MDV". At RPRU this year there was an old MD for sale that I was looking at, and it had one of those things on it. It's the first one I've ever seen. I asked the owner about it and he said he didn't know anything about it. Any idea what it might be used for that is specific to the diesels? Brian

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Haas

08-04-2005 17:56:53




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 Re: MD clutch hold-out lever in reply to n9lhm, 08-03-2005 09:14:45  
I missed seeing the one at PPRU. Howeve, have seen this before and also on the one I spent many hours on as a youth. That clutch holdout is to make hand cranking of the engine easier. The diesel engine, even when in gas mode still has a lot of drag and is much more difficult to hand crank than the gas version of the M. That is why the MDs had 12 volt starters. The idea of the clutch holdout is to disengage the clutch for hand cranking (while of course still putting the transmission in neutral). This relieves the resistance of the transmission and the hydraulic pump making hand cranking a little easier.

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n9lhm

08-06-2005 05:07:11




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 Re: MD clutch hold-out lever in reply to Haas, 08-04-2005 17:56:53  
The one at RPRU was in one of the north-south vendor rows, just north of the Mini Cooper! (My son loves those things, but they look like a 1968 Citroen to me though!) Thanks for the replies, the starting thing makes sense to me. Brian



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Haas

08-06-2005 18:30:37




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 Re: MD clutch hold-out lever in reply to n9lhm, 08-06-2005 05:07:11  
We almost never tried to hand crank start out MD in the 1950s because it was so hard to turn with the crank. The few times we tried it in cold weather when the batteries were dead (dead batteries were a common problem back then. Today's batteries are much superior!) the effort usually ended in failure. It was too heavy to pull effectively with our other tractor which was a Super A. (The Super A could nearly always be started no matter the temp) So what we would do is flat belt up the Super A to the MD belt pulley and crank it that way with the belt pulley. Takes two people (as does pull starting) but it worked pretty good.

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Harold H

08-03-2005 13:47:18




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 Re: MD clutch hold-out lever in reply to n9lhm, 08-03-2005 09:14:45  
I don't know why it would be used, have never seen one and missed seeing the one at Lebanon. However, there is a heavy duty ball bearing throwout bearing that I have seen listed somewhere in the distant past for use in this application. Again, why, I don't know. Any suggestions?

On the Cub at one time there was a hydraulic creeper drive that required the clutch to remain disengaged as it drove the tractor through the PTO shaft but I have never seen or heard of anything like that for a M.

Harold H

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Harold H

08-03-2005 14:40:49




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 Re: MD clutch hold-out lever in reply to Harold H, 08-03-2005 13:47:18  
On further thinking, I believe the clutch hold out leaver is a cold weather starting aid for extreme cold weather. When the clutch is engaged on a M or MD, the hydraulic pump is disengaged as well as all of the gears. This would releave the drag of the cold hydraulic oil and the cold rear end oil enabling the engine to turn more freely thus making it easier to start. Just my idea but I think it is logical.

The forementioned hydraulic creeper for the Cub design would not work on a M because you have no hydraulics with the clutch disengaged anyhow.

Harold H

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