Adding Extra Hy-Tran - 1066

I want to add the extra 5 gal. of Hy-Tran to my 1066. It's past the full line now but not by much.....say 1/4 in. For those
that have added the extra 5 gal, how far over the full line is the oil level?

Thanks for your response.

Not sure on that. Probably about the 1/4-1/2 inch you have now. It spreads over a large area inside fills everything from the rear to the clutch section. If you drain it there are like 4 plugs to get out to do that. 3 beside each other at the back then 1 or 2 up in the front. The one hides above the drawbar in the rear.
We did that one time on and 856 didn't see any difference on things so don't do it anymore.

About an inch.Maybe 2"..I don't exactly remember.Make note of where the oil level is now. Your 1/4" inch 'over' wont really matter. Pour in 5 gallons,remark the stick.I mark them with a chisel to make a clean line across the stick that is easy to see.

I wish to ask the question as to why you wish to overfill the rear end of this 1066? I remember my dad telling me about a recommendation coming from IH back in the 1960's to add more Hy-Tran to the rear end of their 806 in order to help quite the howl/whine from the rear end. Is this the reason why?

Silver, the hydraulic pump on these tractors have a suction tube that can come loose or o-ring failure. If it does, it will cavitate the pump. Over filling the Hy-Tran by 5 gal gets the level above the suction port so it doesn't matter if the tube becomes loose. I believe a cavitating pump could lead to a whole bunch of misdiagnosis in the hydraulic system.

U could take the 3rd link bracket off and look at oil level, then mark dipstick accordingly. IIRC halfway up on axles?

Thank you for explaining that! It gave me a better understanding. Are there any detrimental affects to overfilling by this volume? Secondly, I posed a question a few days ago about hydraulic system capacity on a 66/86 series tractor and operating a Kinze 2200 planter. I am getting together with these guys this weekend. They are contemplating putting this planter on a 1486. I looked the tractor over some and thought it was a newer one with the PFC hydraulic system. It does not have the hydraulic oil filter along the side of the oil pan. I didn't look to see if it had the flow control levers on the floor of the cab in front of the right hand side controls. I don't know if it might have been new enough to have the PFC system, but may have been modified, which I suspect may be the case because there are two hoses along side the oil pan of the engine, where the PFC hydraulic filter would/should be. You mentioned this suction tube that can fall off or have a failure on the O-rings. Is this also a common occurrence on a 1486? I was told this tractor tends to chatter and struggle with folding the wings on a tandem disk. Might this be a sign of the problem you cited and it may be advantageous to overfill the rear end of their 1486?

My 1066 handles folding in the wings on my disk with no problem. If your friend's 14 chatters, I would say a lack of oil. First, check oil level. Next, change the wing hoses over to another scv. When was the last time the hydraulic filter changed? Next, I would inquire with somebody else if the 1486 can handle an extra 5 gallon of Hy-Tran. Sorry, I can't say for sure but wouldn't know why not. Hope it's not the dreaded....."need a new pump."