1466 Draft Control

61-4010 · Dec 26, 2012

Need a quick lesson on the mechanics of how the draft control on a 1466 works.

Reader's Digest version....I have some hydraulic oil leaking around the point where the lower lift arms connect to the control arm. On my JD 4010, the draft control is managed by a bar that runs thru the transmission and on each end of the bar there are seals. When the seals wear out, leaks take place. But in reviewing the 1466 schematics,I don't see anything like this so I'm trying to figure out how the draft control works.

Just a simple explanation will suffice.

Thanks!

pete 23 · Dec 26, 2012

Works very similar to the Deere. That lower link contains a torsion bar which when pulling on the hitch points, it twists that torsion bar. It inturn is splined to a hollow shaft that has a sensing lever clamped to it and moves forward when hitch links are pulled to rear from load. This triggers the draft control valve to raise the hitch until draft load from implement stabilizes again and hitch stops moving. John Deere does same thing but that bar they use bends in the middle when load pulls on the ends. This inturn moves the sensing lever inside and also raises hitch. The IH also will leak from o-rings and requires draining, removing pto unit and getting the tube out to replace o-rings and maybe the bushings. We call them cheaters. Incidentally, new tractors use a pin with a resistor built in that senses the strain on pin, which changes the resistance which changes the voltage at controller which inturn raises hitch to again match the voltage previously seen.

Jim Naden · Dec 26, 2012

(quoted from post at 12:31:28 12/26/12) Need a quick lesson on the mechanics of how the draft control on a 1466 works.

Reader's Digest version....I have some hydraulic oil leaking around the point where the lower lift arms connect to the control arm. On my JD 4010, the draft control is managed by a bar that runs thru the transmission and on each end of the bar there are seals. When the seals wear out, leaks take place. But in reviewing the 1466 schematics,I don't see anything like this so I'm trying to figure out how the draft control works.

Just a simple explanation will suffice.

Thanks!

Instead of a load bar that flexes as used in the John Deere system, IH used a torsion bar inside a torgue tube.

There is an arm clamped to the tube that transmits the movement to the draft linkage that moves the control spool to adjust hitch height as needed to maintain draft load.

There are o-rings, replaced with quad rings that seal against the torque tube. There are bushings that the torque tube rides in that can fail. Replacement bushings are composite instead of the original two layer style that can separate.

That's it in a nutshell. (hazelnut shell)

Jim N.

61-4010 · Dec 26, 2012

Thank you both Jim and Pete. Sounds like I have some o-rings, seals and bushings to replace to stop the weeping.

Sounds like in some respects the 1466 draft control is in fact like my 4010. So I"ll now know what to expect.

Take care guys!

1466 Draft Control

61-4010

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pete 23

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Jim Naden

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61-4010

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