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Draft vs. Position control

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Clint

02-20-2002 08:53:08




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Could someone explain the difference between draft and position control and when and why you would use each. Just don't understand the difference. Thanks.




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Clint

02-21-2002 06:02:00




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 Re: Draft vs. Position control in reply to Clint, 02-20-2002 08:53:08  
Thanks guys, I guess this sums it all up!



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Larry 8N75381

02-20-2002 17:05:48




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 Re: Draft vs. Position control in reply to Clint, 02-20-2002 08:53:08  
Clint,

To add to what John has said read the thread at the link below. In it, I have a lengthy reply that seems to help people trying to use draft control.

I was "visiting" here for another reason, and saw your post. The subject is one I almost always reply to on the N_Board. So I thought I'd point you to the thread over there.

You will notice one of the replies is from Zane. Think he has a Fergy as well as a bunch of other stuff, including a Ford. He has a modification for the older TE-20, TO-20 & TO-30's that adds position control to them. They came from the factory with only draft control - same as the Ford/Ferguson 9N/2N's. Hope the guys over here know about it.

Regards,
Larry

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John

02-20-2002 11:14:52




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 Re: Draft vs. Position control in reply to Clint, 02-20-2002 08:53:08  
Position control, by contrast to draft control, will maintain a constant rockshaft (lower link height) relationship to the tractor (not the ground) irrespective of the pulling load (draft)
applied on the lower links of the hitch. Appropriate applications include any implement required more precise and/constant hitch height. Examples would include both stationary uses (post-hole digger) and and mobile uses (three point mounted spreader).

The more interesting subject in this general area when MF tractors are involved is pressure control, particularly as use with the OEM weight transfer hitches. This hitch control function, as used with these hitches will tend to maintain a constant weight on the drive axle (rear) tires irrespective of of the variable attitude (angle of presentation) of the tractor relative to the hitch lower links as it follows the trailed implement to which it is attached. The practical effect is as a very large stack of varible weight wheel weight plates which never weigh more than the weight of the hitch. This very cheap major pulling power amendment can be often found for less than $100.

The fourth usual MF hitch function is response control. This is simply a hydraulic flow control which control within the design range of the particular lower link arrangement the rate at which the lower links respond to draft control signals. The classic application is the semi-mounted plow. The response control function, used appropriately, will tend to keep the bottoms from chattering in the ground due to too fast a hitch response setting.

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John

02-20-2002 11:14:08




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 Re: Draft vs. Position control in reply to Clint, 02-20-2002 08:53:08  
Position control, by contrast to draft control, will maintain a constant rockshaft (lower link height) relationship to the tractor (not the ground) irrespective of the pulling load (draft)
applied on the lower links of the hitch. Appropriate applications include any implement required more precise and/constant hitch height. Examples would include both stationary uses (post-hole digger) and and mobile uses (three point mounted spreader).

The more interesting subject in this general area when MF tractors are involved is pressure control, particularly as use with the OEM weight transfer hitches. This hitch control function, as used with these hitches will tend to maintain a constant weight on the drive axle (rear) tires irrespective of of the variable attitude (angle of presentation) of the tractor relative to the hitch lower links as it follows the trailed implement to which it is attached. The practical effect is as a very large stack of varible weight wheel weight plates which never weigh more than the weight of the hitch. This very cheap major pulling power amendment can be often found for less than $100.

The fourth usual MF hitch function is response control. This is simply a hydraulic flow control which control within the design range of the particular lower link arrangement the rate at which the lower links respond to draft control signals. The classic application is the semi-mounted plow. The response control function, used appropriately, will tend to keep the bottoms from chattering in the ground due to too fast a hitch response setting.

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John

02-20-2002 10:54:16




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 Re: Draft vs. Position control in reply to Clint, 02-20-2002 08:53:08  
Use of the draft control feature will raise and lower the lower links of the 3pt hitch in proportion to the pulling force applied through the hitch. The classic example is the semi-mounted plow. Draft control, responding to the variable pulling forces required by the soil engaged bottoms, will raise and lower the lower links, at any given position setting, to tend to maintain a constant "pull" or "draft" by the tractor.

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John

02-20-2002 10:53:58




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 Re: Draft vs. Position control in reply to Clint, 02-20-2002 08:53:08  
Use of the draft control feature will raise and lower the lower links of the 3pt hitch in proportion to the pulling force applied through the hitch. The classic example is the semi-mounted plow. Draft control, responding to the variable pulling forces required by the soil engaged bottoms, will raise and lower the lower links, at any given position setting, to tend to maintain a constant "pull" or "draft" by the tractor.

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