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Farmall 806 no TA lube pressure


Brian S
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Not sure how much leakage you will see when you push lube oil in but I know there will be oil leaking out TA. Some is normal

When you put in sump check. You had it in like pic. Male end in first, Spring inserted and will be up against mcv. Red arrow showing spring

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Good evening folks,

 

Got the MCV back on the tractor tonight. Got some pressure readings from the correct port this time, both cold and warm. At cold, both DD and TA had 220 psi for the clutches and about 18 psi for lube. Once it warmed up, lube went to 0 again, DD was at 200 and TA was about 210. Pressure between the two read about 140 psi. 
 

Obviously those numbers are lower than they should be. From what I gather from you guys, it kinda sounds like it needs to come back apart again. What do you guys think? You know a lot more about these than I do.

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Called my local dealer tonight and talked with one of the techs. Explained to him what I have going on. After some talk we decided the next best thing to look at was the MCV it’s self and see if by chance there’s a blown gasket. Well, we may have found a winner tonight. The gasket between the back plate and the center valve section had a spot that was off into one of the circuit runners in the casting. I have a gasket kit here for the MCV so I’ll stick that in and try it out. 
 

Don’t know if it’s a cure all fix but it certainly isn’t helping the cause.

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Evening gentlemen,

Good news, the gasket seems to have done the trick. She held 20 psi of lube for a half hour thru all rpm ranges. I’ll have to get the brakes and steering hooked back up next.

 

Here’s the question, clutch pressure on both DD and TA hold at 240, a touch low. Somewhere I think I read that it’s possible to shim the relief valve to boost the pressure. The question is how low is too low of a pressure? The warranty card for the TA specs out 250-300 psi. Would shimming they relief valve be enough to get me where I need to be? If so, is there a rule of thumb for shimming to achieve a desired pressure? Or am I completely off on that train of thought?

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Just now, Brian S said:

Evening gentlemen,

Good news, the gasket seems to have done the trick. She held 20 psi of lube for a half hour thru all rpm ranges. I’ll have to get the brakes and steering hooked back up next.

 

Here’s the question, clutch pressure on both DD and TA hold at 240, a touch low. Somewhere I think I read that it’s possible to shim the relief valve to boost the pressure. The question is how low is too low of a pressure? The warranty card for the TA specs out 250-300 psi. Would shimming they relief valve be enough to get me where I need to be? If so, is there a rule of thumb for shimming to achieve a desired pressure? Or am I completely off on that train of thought?

You can shim it one washer makes quit a difference 

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Good job getting it going. That's a bad feeling when you suspect you have a bad $750(or more)  TA unit. 

Most of the last few spring kits I've used had around 320 PSI drive pressure which I thought was a bit much. Cut 2 coils off the outer spring and had 290. ?

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Ok, dumb question, but I’ll ask anyhow. When shimming the relief valve, do you shin between the valve and the spring or between the valve and the plug? I put one #10 washer between the valve and the spring and it made little to no difference tonight. I thought about adding a second but one of you warned me about not getting carried away with it. I just wanted to check before I added another washer.

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I'm not for sure which way I done one years ago or if it was the right way but If I remember right I put it valve and spring like you did. I'm sure someone else will be able to tell you more about it then me. Good luck you sure have come along way with it.

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Good evening gentlemen,

 

Good news, I think I got it. Once warmed up, the old girl maintains 18-19 psi of lube pressure, 270 psi on DD, and 250-260 on TA. I have three #10 washers as shims in the pressure regulator valve (.039” avg for reference). It seems good in the shop. I’ll probably take the splitting stands off tomorrow night and start buttoning up some light wiring and the sheet metal. Maybe this weekend I can find a little work for the old girl to try it out on before we stick the cab back on.

 

Thanks for all your help guys, it’s much appreciated.

 

Brian

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  • 3 weeks later...

Howdy folks, 

 

Been too wet to get the old girl out and really run it, but got it out and run it around the barnyard a bit. Pressures still seems to be holding steady so I think we got it. Managed to get a little time to get all the sheet metal back on it and add a couple new light on the front end. Straightened out a little wiring too. Just need to get the cab back on it, the duals, and the weights we took off to push it in the barn at the start of this saga. 

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  • 3 months later...

Howdy folks,

 

Just thought I'd give you guys an update and another thank you for your help getting the old girl going. Got the cab and duals on it and ran the snot out of it this spring getting everything planted. Pulled like a 20 mule team on the chisel plow, by far the best its ran in my lifetime so I'm very happy with how things turned out. Dad's happy to have his old girl back up and running. He planted planted corn with it with a big old grin on his face.

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