Zanes adjustment gage

J. J. R.

Member
Been reading a little about 641 hydraulic lift problems. Seen some good comments about the adjustment tool that Zane sells. But everyone talked about using it on an 8N. Will the same tool work on my 641, or does he have a separate tool for the hundred series? Someone said his kit also includes a following pin. That's great, mine is wore half way though and there is no part number for it in my dealers old books. My lift works ok, but it doesn't lift all the way up, nor does it work at all in the draft position. I'm hoping both problems are related to the worn pin and being out of adjustment. Does anyone have Zanes E-mail, or a link to him?
Thank you for any help.
 
If you replace the cam follower pin and precisely follow the alternative draft and position adjustment procedures in the I & T FO-20 manual, all will be well.

If you run out of threads on the turnbuckle, replace the draft control fork.

Dean
 
there is no part number for it in my dealers old books.

Part number for cam follower pin is 374072-S

A 5/16" x 1" hardened, split, roll pin will work in a pinch. They are also available from just 8n's
 
5/16 " is a rounding, as the correct press-fit is 0.309". Good part number though.
 
found a few dowel pins that mike out at various sizes, and measured a 5/16" drill bit too. But none were quite close enough to use. So I turned the original pin around the pressed it back in. The worn end is now inside the arm and seems to fit nice and tight. I was anxious to see it work, so I put the assembly back on the tractor just to see how far it lifted now, and it seems to lift all the way up now. But still have no function in the draft position. It's not a big deal, I only use a trailer plow once a year, so I doubt I'll ever need the draft anyway. But if I by some chance I could fix it before I put it all back together I would like to do it. Any ideas? Thank you all again for your inputs. One last thing. At full lift of the three point arms, I know you can always lift them further up by hand. But does anyone know approximately how many inches that should be?
Thanks again.
 
is the draft/position lever actually toggling & compressing the position control spring when you move it to Draft? Am i correct in that when Draft mode is selected, the lift arms do not move?
 
Got a sack full of the 3/8 X 7/8 pins years ago. Probable got 50 or so left. Any body that could use one or two , Holler. They will go in first last mail. On another note , if you run out of threads on adjusting to get draft control , take the big spring off and grind a slot for the dowel guide pin a thin flat washer, put on behind the yoke , reinstall the parts and big spring.
 
Yes it is moving the mechanism. I checked it when I had the cover off and did a little measuring of the adjustments according to the FO20 book. All seemed very close. But that is correct that there is no movement of the arms at all when I have the lever down in the draft position and try to raise it with the touch control lever. It did jump just a little, but I think it was just releasing or bypassing the oil pressure.
Thanks again.
 
In the attached picture, there are two inputs marked that move the control arm, the swivel (SW) moves the arm when in draft mode & toggle (T) has the position control spring compressed and thus the end of the bolt thru the position control spring is pulled back away from the control arm (note gap just to right of SW). When in the Draft mode, this gap means there is no position input to control arm and the SW via spring P now has control of the control arm. If spring P is too short it can not provide this draft input. Likewise if the draft input plunger/fork assembly (just above arrow on P) is bent this will yield the same result as too short a spring P. If this is bent, it is virtually impossible to detect due to odd shape. In the second picture, you can see the Position control "gap" clearly and also see that the draft spring & swivel are now providing the input to the control arm. Examine all these parts & movement. Since position control is working, you will be able to determine where the control arm/control valve need to be for lift & lower & compare such positions with unit in draft mode to see if valve can be properly positioned for lift/lower.
7mf5mk7.jpg

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(quoted from post at 22:43:59 02/06/18) Got a sack full of the 3/8 X 7/8 pins years ago. Probable got 50 or so left. Any body that could use one or two , Holler. They will go in first last mail. On another note , if you run out of threads on adjusting to get draft control , take the big spring off and grind a slot for the dowel guide pin a thin flat washer, put on behind the yoke , reinstall the parts and big spring.

Wayne, I'd like to buy 5 of those pins. Have 2 NAA's and 3 8n's
email is [email protected]. Let me know price and shipping
 
Thank you so much for the great photo's and excellent explanation. I'll be taking the cover back off tomorrow. I'll defiantly compare your pictures to my assembly. I sure do appreciate you going out of your way to help me. I'll let you know what I find.
 
I see it now. Believe my arm must be bent. Impossible to see, but that's got to be it. If the turnbuckle adjustment can't be exactly abstained, will that cause the only the draft control not to work? The arm is no longer available through the dealers, However I did find a new 957E504 control arm for sale in our local antique parts Depot. $340.
 
Your right. The position control works great. From everything I've read, the reason I can't get to the proper adjustment is because I have a bent control arm that is very hard to find. At least ever since I changed the following pin it raises all the way up now just fine. The tractor is in good condition, and does have power steering and a up/down Sherman, so I may do a complete restoration on it someday. But for now it's just a user. Thank you to everyone on this discussion. I've learned allot that will undoubtable be valuable information for future projects.
 

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