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Oliver, Cletrac, Co-op & Cockshutt Tractors Discussion Forum

770 Noisy Trans-Good Question for Wrenchbender

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MCL

09-30-2004 09:52:03

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I have posted this before but now I have more info. I have a 1958 770 that makes an awful noise in the high range (3,4,6,R2) of the transmission. I'm not talking about the "Oliver whine". It is more like a rattle. I took the hyd unit off to get a look and here is what I found.

The larger gear on the input shaft has about 4 chipped teeth. They are not together but at random all the way around. This is the gear that meshes with the countershaft (the one on the left side of trans) when you shift to the high range. A couple of gears on the countershaft have what look like rust pits on the faces of the teeth. Also the bearings in the countershaft seem to have a lot of play up and down. It has some play front to back but I am sure that is normal.

Here are my questions and/or assumptions. I know chipped teeth will make noise. Are the pits in the teeth caused by water in the oil or is it something else? This tractor has set outside a lot at some point in time and could have gotten water in the trans. Can the countershaft bearings be changed if needed with ordinary tools? I see the cover on the front of the transmission housing to get to it.

I would appreciate any information from anybody out there.

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Wrenchbender

09-30-2004 17:33:16

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Re: 770 Noisy Trans-Good Question for Wrenchbender in reply to MCL, 09-30-2004 09:52:03

Hey Matt,

I've got a couple 77-super77 parts tractors if you need some gears. I'm pretty busy with the harvest now, but I'd be willing to come up sometime and help you out if needed. WB.

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J. Schwiebert

09-30-2004 10:41:24

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Re: 770 Noisy Trans-Good Question for Wrenchbender in reply to MCL, 09-30-2004 09:52:03

I thinK you were the one that I told to slip the middle fork so that neither gear was in mesh and se if the noise went away. It can be done at least on an 880. One good thing, And I am not going to look at a parts book today but I think the part number is M-608 so a gear from a 77 or super 77 rowcrop will work. We always blamed that pitting on the thin 10w-30 oil at that time. Taking the countershaft out is a piece of cake. You need a long drift from the back through the PTO opening. Hold the rear bearing in place with a cresent wrench. drive the shaft and front bearing out. pop the rear bearing out. That was also a common replacement. You did not say but if you have a Power Booster, the engine will need to come out first.Questions?

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MCL

09-30-2004 11:44:36

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Re: 770 Noisy Trans-Good Question for Wrenchbender in reply to J. Schwiebert, 09-30-2004 10:41:24

If I remember right it does not make any noise until it is actually in gear and moving. Then it sounds like the entire transmission is coming through the floorboard at you. It does not have a power booster so that is good.

I see a big nut on the back of the countershaft. It looks difficult to get at. Can you get the closed end of a combination wrench on that? I suppose I should take the front cover off the countershaft and see what is there. Some time ago I made photocopies of the parts book but cannot find it right now.

Thanks for the information.

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J.Schwiebert

09-30-2004 12:41:35

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Re: 770 Noisy Trans-Good Question for Wrenchbender in reply to MCL, 09-30-2004 11:44:36

Send me this information on the HPOCA web site. The countershaft is supported by tapered bearings on each end. Most of the time there are enough shims left in there to adjust it. The shims are under the front bearing cap.

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