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Farmall 450 TA issue

T

Tony_Idaho

Member
Hello,
I was hoping someone could give me some suggestions on where the problem is with my Torque Amplifier. When I pull back the lever, I do get into the lower gear ratio as expected. But after a while sometime 1 minute sometimes 15 minutes, it comes out of gear. Meaning the tractor is still running, but wheels are not turning. If I move the lever back to the front of the tractor, the tractor starts moving again in the higher gear ratio. Then if I pull back to lever it again goes right into the lower gear ration and I have to repeat this over and over.

Can someone explain in the picture I am attaching where the issue might possibly be.
I have some numbers to help me out on which gears you might be talking about.
a33479.jpg
 
That was my first thought, but then I got to thinking (probably too much) If the clutch (#6 in photo) is actually disengaged, like it should be when using the TA, and that started to "slip/not work right" wouldn't that just put it back into direct drive and the tractor would still move??
 
In the pic there is a callout for ORC top of cutaway, #3. This device holds the housing of the TA assembly and keeps it from turning, this absorbs the torque reaction from the reduction gearing shown. When the TA lever is forward, the TA Clutch (Shown to the far right) is engages and the TA housing turns as a unit at 1:1 ratio.
That ORC (over running Clutch) is a sprague clutch it allows rotation in one direction, and a set of ramps and rollers wedge tightly when rotated the opposite direction. Your ORC is toast. It requires a split of the tractor at the clutch, and rear of TA to replace the ORC.
Replacing the TA Clutch is also recommended. There are several rebuilt TA units available. Hi-Capacity brand seems very good, A brand called Power-Diode (or something like it) has had reliability issues. Kevin Meyer Does not market on this sight, but he sells TAs and parts. He contributes often. Jim
 
If it slips on the low side it is either out of adjustment or needs an overhaul. There are no other choices. The principle of adjustment is simple, you adjust the main clutch to specs, then adjust the TA clutch so that it releases at the tail end of the main clutch engagement, if I remember right. The procedure to do that requires a manual, unless someone else that types faster than me wants to do it. You are correct that with the lever back the TA clutch is disengaged. But it will not go back into direct until you push the TA lever forward.
 
Tony, when your TA lever is back in low range your TA clutch's are disengaged. Your TA rollers are probably bad. Check your TA adjust by the book. If that doesn't work then your rollers are probably bad in the TA unit. I could be corrected.
 
The problem is the overrunning clutch #3 when #6 is disegaged #3has to hold #4&5 which is the planetery gear set to get the lower speed when that is held (#4-5 called the carier)the power goes through the gears pg psg ssg when #3 slips the power stops there BOB
 
Thanks for the info... Sounds like not a fun project to under take at the moment.

Also I would like to thanks you for the info on my shifter issue a week back. I popped the shifter off and moved the shifter lever back, and now she runs great again.

I did have one question, in the picture of the shifer levers, what kind of grease should I be looking at. It looks almost like grease for zerk fittings... that normal?

Sorry for all the pictures, but it usually helps me out.
a33481.jpg
 
The transmission lube (hy-tran fluid) is the only source of lube for the shifter. Gear splash provides that. It isn't much, but the only thing that wears is that lever tip. Keep the TA forward and just use 5 speeds until you rip into it. Jim
 
man do you have a mess in there with all that rust and sludge. can even see wear on the shifting rail with the arrow. needs a good cleaning and rail fixed. and oil change.
 
If the shift fork picture is of the same tractor as the one you are having TA problems with, the oil may be causing your problem. Too heavy of an oil, like 80/90 gear oil, can cause the rollers not to lock in the TA. I would get the transmission cleaned up and get the correct oil in it before I dug into the TA.
 
The transmission and TA require, REQUIRE, CaseIH Hytran.

That may be what's in there now, but if you haven't changed it, it's probably thicker than gear oil from all the sludge and contamination.

Pull the cover off the TA section under the gas tank, and hose everything down with kerosene to wash away the sludge before you refill.

If that doesn't help, your ramp and rollers are shot and the tractor will need to be torn down to replace/repair the TA. This isn't something that can be "adjusted" away.
 
If your TA is worn like this it will slip like yours is doing. Here's one out of 54 SMTA

Gordo
a33506.jpg
 
CNKS, I had a 400 last fall that was going into high range with the lever back. The problem was the fingers on the pressure plate was out of adjustment and the TA clutch was not completely loose and when the TA clutch got hot it would lock up and you could feel the tractor going into high range with the lever back. We adjust the fingers on the pressure plate and hasn't had a problem since. Just for your infomation. ED
 
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