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Allis Chalmers Discussion Forum

a question about changing the oil in the rear on a

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dave of southwest michiga

12-16-2003 16:44:36

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Hello all.....hope y'all are ready for the holidays. We're sure looking forward it!

Over the holidays, I want to drain and change the oil in the rear end, pto, hydraulic pump, and final drives of our little C. Who knows when it was last done? And I've got to reseal the hydraulic ram as it has started leaking.

Now, I'm pretty certain I know where the drain plugs are for the rear end, and I'm guessing that the plug that's on the left side of the differential is where I add the new oil till it starts running out, but are there any other tricks or precautions I have to watch for? Any problems with draining the oil and getting the hydraulic pump recharged? How about the final drives? Anything there? Haven't had the C long enough to know her little quirks.

Wishing you all the best of holidays and a prosperous and peaceful new year.


dave of southwest michigan

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12-17-2003 11:13:15

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 Re: a question about changing the oil in the rear in reply to dave of southwest michiga, 12-16-2003 16:44:36  
I would remove and clean the pans and if you take the side plate off of the transmission (it has the forks on the inside of it) you can clean the goop out of the trans. Not too hard.

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dave of southwest michiga

12-18-2003 16:26:10

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 Re: Re: a question about changing the oil in the r in reply to Tom(ID), 12-17-2003 11:13:15  
Thanks all for the responses. I appreciate it! Dave

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12-17-2003 18:32:49

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 Re: Re: a question about changing the oil in the r in reply to Tom(ID), 12-17-2003 11:13:15  
I have a question by removing the side plate off the side of the transmission, is there enough room to check for worn parts and maybe finding out why my fathers c keeps popping out of third gear? thanks AJ

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12-19-2003 18:46:07

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 Re: Re: Re: a question about changing the oil in t in reply to AJ, 12-17-2003 18:32:49  
I think the rason it comes out of third is the dogs on the face of the gears that engage for third are worn from grinding into gear. Third gear is straight thorough the transmission, the imput shaft is locked to the output shaft, none of the gears are used. A gear slides forward to lock the main shaft in the transmission to the input shaft. The slots are worn that engage each other and after a while it pops out. Had this problem with a B. New parts cost 200 $ plus for each of the two gears. Bought a whole rear end and transmission from a C that had foot brakes instead of the older B hand brakes. And tractor is now wider too. Won all around. I think the parts were about $275 about 15 years ago. I have always wondered of the dogs in the gears could be refaced and work again. Maybe someday if I have nothing better to do I will take the old transmission apart and try it. But don't hold your breath on this one.

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12-17-2003 20:29:33

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 Re: Re: Re: a question about changing the oil in t in reply to AJ, 12-17-2003 18:32:49  
everything is behind the 6 inch round cover on the transmission. the forks and slider will come out with the plate. you then see the top shaft with 3 gears, and the main shaft below it with its gear set. back behind you can see the reverse/ idler two gears. a little cramped to do anything, but you can look and poke with a screwdrvier and slide things back and forth. the bevel/pinion is in the next compartment back, and the pto gears and behind that, but all the trans is behind the 6 inch side cover.

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12-16-2003 16:56:38

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 Re: a question about changing the oil in the rear in reply to dave of southwest michiga, 12-16-2003 16:44:36  
To change the final drive oil you take off the pans, clean them, put them back on and fill to the plug level. 90 weight oil.

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12-16-2003 19:14:15

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 Re: Re: a question about changing the oil in the r in reply to wdTom, 12-16-2003 16:56:38  
probably have to make new gaskets for the pans-- use rtv sealer, etc. lots of sludge inside.--------the transmission/differential and pto are all the same housing oil. there are 3, 1/2 inch pipe plugs on the bottom to drain. all about 8 quarts of hydraulic-trans fluid on left side of transmission case. you can get this at Wal Mart or Farm Store. It is 20wt universal fluid. Pump should be o.k.--easy to prime if you dont remove it or disassemble.

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