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1066 TA problem

D

DeWayne Utrup

Member
The TA on my 1066 slips or stops working on the low side after it warms up. Say after pulling the field cultivator for 30 min. or so. I typically pull the lever back on the ends and it will slip and sometimes stop all together. I want to make it correct. I borrowed an OTC hydraulic tester that appears very similar to the pictures I have seen of the IH Flowrater. I took a reading with the inlet attached to the orifice port on the MCV. With the orifice in place I have 3 gpm at 1200 psi. With the orifice removed I get 9 gpm at full flow. Both of these seem correct with the book so I believe the pump and MCV are good. Are there any other tests that I should perform before I take it apart and replace the TA? Thanks in advance.
 
If you have a hydraulic clutch assist, unhook it at the bottom of the MCV valve and install a 0 to 500 psi gauge, if it doesn't have assist, the port is at the very bottom of the MCV. You should have about 250 to 275 psi in ta and direct. Sounds like ta is bad. Good luck
 
You are totally wasting your time thinking 'hydraulics'.

If it's slipping or won't pull on the low side, you need a TA. Period.

Allan
 
Yup, Allen is correct. The hydraulics do not do the pulling in low ta, it is mechanical. The hydraulics will pull slightly in low because it has 6 small pistons that operate a clutch disc whose purpose is to prevent free wheeling in low ta but a one way sprag does the main pulling. Think new TA coming up.
 
Sounds like similar problem we had with a 706. It started as a bad jerk (stopping then going suddenly). I asked on here, but forgot about there after. Never got around to looking at anything and basically ignored problem. Then while baling on hills it was freewheeling while running in low to not overload baler. It slipped/stopped some before but really noticed on the hills. Got it in to shop for T/A replace, rebuilt MCV while in. Also found broken spring coils in Trans housing(while stripping for T/A) as well that we wanted to find where they went, found missing spring in MCV unit(possible cause for jerking???). No problems since, with that anyway.
 
I heard or read someplace(here??) that they are for moving downshift, like on corners or tough spots in field. Dropping down(to T/A) at high speed(road speed) w/o breaking to slow first causes most problems.
 
The worst thing you can do for a TA is to use it as a brake. The TA was designed as a gear reduction to be used to pull thru a tough spot or just when you need to shift down a gear. Now, using it to turn at the ends isn't quite as bad as using it to slow down on the road when you are coming to a stop sign but it is still not ideal. The reason most TA's fail is because they are used improperly.
 
I have been using 1466 for 15 years for heavy pulling, and have never used TA low, everyone around here told me not to use it as it will cause problems, just stop and downshift if need be. Wondering now if I could use it without problems after so long being only in Hi range, probably 8-900 hours

Dick ND
 
It might not pull in low TA now anyway as there is always wear on the over running sprag even when not using it, like any over running clutch. You might as well use it if you feel you need to.
 
People who say not to use the TA because it will cause problems don't have a clue what they're talking about.

On the hydraulic TA, you are effectively doubling the life of the TA unit by using it.

No you don't need to sit there with a stopwatch and track how much time is spent in hi or low to ensure a perfect 50/50 split. Just use it as it was intended, and you will get the best life out of it.

Shift sharply from hi to low and low to hi. Don't dawdle with the lever in the middle, or try to "ease" it in.

Don't try to slow down a load that's pushing you by pulling the TA, as it's hard on the low lockup clutch.

These are things you can't seem to get drilled into a certain type of worker's head, and why many Southern tractors came from the factory with TA delete.
 
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