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Oliver, Cletrac, Co-op & Cockshutt Tractors Discussion Forum
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Power Booster Failures

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smerr

03-02-2007 15:57:00




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I hear a lot about how bad the Power Boosters were on the 770 and 880. From what I gather, the major failure was in the sprag clutch. What exactly was the mode of failure? Was it wear on either the inner surface of the output gear, the sprags themselves or input shaft? If it was wear, how much was acceptable on the input shaft. Or, did the sprags break apart? Can you tell by looking at these components to tell if they are good or not? I"ve also hear a sprag clutch out of a hydra-power or O/U (I can"t remember which one) will work. I know these are cheaper, but are they better? The reason for all these questions is I picked up a power booster for my 880 and before I install it (and the correct input shaft), I want to know enough about it so after it is installed, it works.

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Adam Suess

03-03-2007 18:24:25




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 Re: Power Booster Failures in reply to smerr, 03-02-2007 15:57:00  
I had to replace the sprag clutch in the power booster on my 880 diesel It would catch if you stoped but not on the go. I got a correct new clutch from AGCO. I forget what it cost but it was not cheap. Every thing else looked good I did borrow a alignment tool from the local dealer to get the housing aligned correctly. Not a hard fix, I just followed the instructions from a few pages copied out of the dealers service manual. Mine does have the pressure lube one it which pumps oil into the unit. I shift it all the time under full load. It's held up for 350 hrs so far.

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dad's88

03-02-2007 22:19:20




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 Re: Power Booster Failures in reply to smerr, 03-02-2007 15:57:00  
In my opinion the major "cause" of failure to the power booster drive is a lack of lubrication to the sprag clutch. Using the wrong oil in the rear end especially during cold weather only exaggerates the problem. In our experience the sprag clutch has always been the defective component, while gear and shaft surfaces have always been serviceable. We've never had a sprag clutch that literally fell apart in our hands, it has always been a slight amount of wear on the rollers, but enough to make it slip on the low side. I've heard that a sprag out of a hydra power drive will work and is cheaper, however a little narrower. Unless these are made heavier or are noticeably better the narrower part would bother me. Don't know, have never tried it, might work just fine. We have several 770 and 880 tractors with power booster drive and once we have made the repairs they have held up, even with a little recreational tractor pulling. While power booster drive is not the best thing for a chore tractor, it makes the gears hard to shift in direct drive, it does have it's place. I find it especially handy when spraying if you come across a thick patch of weeds, you can shift into low range and increase application rate. Saves a lot of clutch work.

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J Schwiebert

03-02-2007 17:44:30




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 Re: Power Booster Failures in reply to smerr, 03-02-2007 15:57:00  
Is this a helical or spur gear transmission? Is the tractor a gas or diesel. What do you plan on doing with it? If a diesel and with a Roosa pump have you played with the torque adjustment? I think an 880 diesel as a straight 6 speed is a good tractor for little "tinker jobs". J.



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smerr

03-03-2007 08:32:09




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 Re: Power Booster Failures in reply to J Schwiebert, 03-02-2007 17:44:30  
It's a helical and a gas. I've read all about the problems with the torque of a diesel and the power booster. I just use the tractor mostly for plow days and picking corn.



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