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851D position control only works at top end.

B

bkbarnes5

New User
Hello, I have an 851D that need some serious TLC, but the current problem I am working on is the draft plunger is broken off and has been modified with no spring. I do not need draft control, but will that also affect the position control? It will only lift at the very top (and just beyond (also modified)) of the hand touch control. Also can you purchase the whole draft assembly?
 
I have all of the mechanics of a 100 series lift chest, still in tack, except for the big main spring and bolt through the spring, if you are interested.
 
(quoted from post at 22:27:36 12/29/19) Hello, I have an 851D that need some serious TLC, but the current problem I am working on is the draft plunger is broken off and has been modified with no spring. I do not need draft control, but will that also affect the position control? It will only lift at the very top (and just beyond (also modified)) of the hand touch control. Also can you purchase the whole draft assembly?
Click to expand...
ormal operation is in top 1/4 to top 1/3. so you may have no problem.
 
(quoted from post at 03:03:14 12/30/19)
(quoted from post at 22:27:36 12/29/19) Hello, I have an 851D that need some serious TLC, but the current problem I am working on is the draft plunger is broken off and has been modified with no spring. I do not need draft control, but will that also affect the position control? It will only lift at the very top (and just beyond (also modified)) of the hand touch control. Also can you purchase the whole draft assembly?
Click to expand...
ormal operation is in top 1/4 to top 1/3. so you may have no problem.
Click to expand...

JMOR, I believe that he is saying that while it is in position control that the lift arms only respond when the control handle is at the very top of its range of motion. The Position control is supposed to work across the entire range of motion of the control handle with the lift arms mirroring how high the control handle is relative to their respective full ranges of motion. That could be a worn cam follower pin and/or the control linkage being out of adjustment.
 

JMOR, I'm with Sean on this one. I also believe the OP is speaking of position control and you're thinking of draft control.
 
(quoted from post at 11:07:43 12/30/19)
JMOR, I'm with Sean on this one. I also believe the OP is speaking of position control and you're thinking of draft control.
Click to expand...
think you are right about my thinking. :oops:
 

JMOR you are correct in what I am saying. I understand about the cam being worn as well, and I will check that out. Additionally what I want to know is if the actual draft is snapped off, will that affect the position control? In other words, does that have to be replaced? If so I need to get parts prior to opening up.
Thanks
 

If the 851 parts will coss to a 600 I have a 600 lift cover apart.

I am gonna say it should work without the draft linkage... I would have to look and make sure the pin that that limits the travel of the lift piston from the lift cylinder bore is not part of the draft linkage...
 
(quoted from post at 15:51:16 12/31/19)
JMOR you are correct in what I am saying. I understand about the cam being worn as well, and I will check that out. Additionally what I want to know is if the actual draft is snapped off, will that affect the position control? In other words, does that have to be replaced? If so I need to get parts prior to opening up.
Thanks
Click to expand...
he way I see it, if the draft plunger and the part it attaches to have wound up as though the plunger is all the way to rear, then the draft swivel will be free to move between C and D. In that case I see position control to be free to function normally. However as lift moves thru travel, if the draft swivel travel between C and D is hindered by the draft plunger/draft spring, draft control link assemblies, then I don't believe it will function as it should in Position control.
jJCMdSP.jpg
 

Excellent picture JMOR, thank you that helps. Brings up another question though... several post mention the "cam" wearing out on on the position control that will throw off the position. Is that item "A" or "B" in the picture?
 
(quoted from post at 16:37:02 01/02/20)
Excellent picture JMOR, thank you that helps. Brings up another question though... several post mention the "cam" wearing out on on the position control that will throw off the position. Is that item "A" or "B" in the picture?
Click to expand...
he cam follower pin usually worn worse than cam, but both wear.
4sqmkh3.jpg

HEyUJYw.jpg
 

JMOR, Wow, thank you so much. Very helpful! I have searched and searched for these details. I am picking up parts today, I will let y'all know what happens.
 
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