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806 brakes still lock up

D

Dave from MN

Well-known Member
completely went through the brakes assemblies, they wer shot from the drag. Jack up tractor, wheel spins freely, start tractor, tire locks up, brakes on with no pedal move ment. Bought $76 IH brake valve rebuild kit, Alot more parts in it than I need.Rebuild valve, didnt see anything that looked bad. Reassembled,as best as I coult see on the diagram and how it came apart( not sure if the last guy that worked on it put it together though), Start tractor, brakes lock up. Any other ideas? Adjusted brakes to IT manual also. So very frustrated. Pleae advise. Thank You!
 
I do have hyd flow out of the bleed screw when I open it.It doesnt shoot out at high pressure any more but comes out with a pretty good flow with brakes not depressed, in fact it does it with the brake valve pistons rods not even connected to the brake pedals.
 
I am putting my thinking cap on here but I believe the two spools in the brake valve are slightly different and can be mixed up,in wrong hole. Other thing is that the screw holding pistons on inside valve have to be bottomed out or they will contact valve cover and hold valve applied. I would just run a bleeder hose off bleeder back into tractor dip stick and see if brake is free then and if so you are darn sure problem is brake valve not self adjusters etc. I have had to do some compensating over the years on those self adjusters and the portion of housing they contact to make up for worn or resurfaced parts to overcome brake dragging. You need to have like .020 clearance on disc when brake is released, engine running.
 
What I am getting at is that it is possible to have some flow out of the bleeder even without pedal being pushed. What you need to determine is if when opening the bleeder do the brakes drag. If they do not drag with bleeder open but do drag with bleeder closed then your problem is in the brake valve. The normal adjustment on those tractors was to actually have a slight amount of tension (in other words pulling the spool out of valve) so the brakes would be responsive quickly but not develop enough pressure to over come the return springs in the brake.
 
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