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Farmall & IHC Tractors Discussion Forum
:

966 popping out of gear when you coast

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Joe Miller

05-23-2007 09:28:24




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We have a 966 that you put in gear F or R H or L and most of the time if you gas it and coast it feels like it drops out of gear but if you drop the gas and let it Idle for 15 sec you can feel it "POP" in and it pulls again. Alot of times it feels like it just doesnt go in gear. I have replace the linkage topped fluids and nothing works. I had 2 mech look at it and they can't figuire it out. I feel like they didnt know what they were doing. What should I be looking at. When it is in gear and UNDER power it pulls just fine. It even pulls great UNDER power up hill until you coast then it pops.

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Nat 2

05-23-2007 11:45:04




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 Re: 966 popping out of gear when you coast in reply to Joe Miller, 05-23-2007 09:28:24  
If it were really popping out of gear, it would not pop back in. The tractor would coast to a stop, then you would have to push the clutch in and shift it back into gear.

The TA, Torque Amplifier, is freewheeling. It's not supposed to, no matter how many mechanics tell you otherwise.

Does it freewheel with the TA lever forward or back?

As 'vet said, checking the MCV is something only the professionals can do. That's the first thing to do. It may very well be that the TA is shot, too.

What kind of mechanics did you call? Car mechanics? John Deere mechanics? Of course they won't know what they're doing! You need a mechanic from a CaseIH dealer, preferably one of the older guys in the shop that's been there for 30-odd years.

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the tractor vet

05-23-2007 18:05:43




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 Re: 966 popping out of gear when you coast in reply to Nat 2, 05-23-2007 11:45:04  
AH NAt they will free wheel , just park one on a hill and shut the engine off with out putting the park loc down and see what happens.



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the tractor vet

05-23-2007 09:38:45




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 Re: 966 popping out of gear when you coast in reply to Joe Miller, 05-23-2007 09:28:24  
Sounds like you are loosen pressure on the T/A , is your TELTALE lite working on the dash??? if not put a new bulb in it and see if it come on or if ya notice and hard steering when this happens . If it was POPPEN our of gear in either the range trans or the speed trans then there should be a teltale of gear clash or grinding. Did any of them socall mecenicks put a gauge to it to check pressures on the MCV.

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joe miller

05-23-2007 09:52:16




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 Re: 966 popping out of gear when you coast in reply to the tractor vet, 05-23-2007 09:38:45  
Please explain as I am a laymen when it come to these machines. If you could please explain what I should be checking. The socalled mechs did not check any pressures.

Is the TA torque Amplifyer?

What is the MCV and how would I check it?

Thanks for your help.



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the tractor vet

05-23-2007 10:37:46




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 Re: 966 popping out of gear when you coast in reply to joe miller, 05-23-2007 09:52:16  
Yes on the T/A and the MCV is the the control valve that controls the steering, brakes, T/A pressures for high and low along with the lubing of the rear end and cooling of the hyd. oil. IT takes a couple gauges to do this with the correct fittings and one special test tool and there is another test that rquires a Flow Rater that checks the amount of hyd. oil being pumped by the Hdy. pump on the MCV . this is best left to the guys that have all the toys to play with and know how to play with them . the TelTALE lite is that big red lite that is on the lower right face of the right hand side of the dash and should come on everytime that you push the clutch down or be on before ya start the engine. This lite tells ya that the MCV has lost it's pressure or that the dump valve has been tripped by the clutch , this also allowes for easier shifting of the transmissions . . You also could be sucking air in the center section as when ya slow down all the fluid moves foward and allowes the air to be sucked into the MCV thus causing the T/A to unlock but this will also cause the steering to get stiff and lack of brakeing. You could try running the hyd. a couple to three gallon over full and see if this just goes away .If it does then the next time that the tractor is split a new O/Ring where the speed transmission and range transmission come together will get a new O/Ring if the guy that is doing the work knows what he is doing. On the computer i can not check it out myself and i sure can't make a service call unless you are REAL CLOSE TO me .

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