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Allis Chalmers WD fluid changes

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Jim Lewis

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PostPosted: Tue Jul 10, 2007 2:11 pm    Post subject: Allis Chalmers WD fluid changes Reply to specific post Reply with quote

I have an AC WD and want to change the fluids...engine oil, hydraulic, PTO, transmission and differential (rear end). The engine oil is no problem, but I can't find any drawing showing the drain plugs and fill plugs. I have removed the drain plug in middle between the two back tires. I assume that is the rear end plug. I have a service and operators manual but they have little information about the drain/fill plugs and types of fluids needed.

Can someone help? I have several acres of pasture to mow.

Thanks in advance,
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willie in mn

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PostPosted: Wed Jul 11, 2007 4:08 am    Post subject: Re: Allis Chalmers WD fluid changes Reply to specific post Reply with quote

Since no one else jumped in here, guess it's up to me.
There are 4 drain plugs.
Starting at the rear is the diff drain, that's the one you drained.
Second one is under the trans.
Third one is at bottom of PTO drop box.
These 3 are connected internally, but have a partial divider, so need to drain all 3 before filling any of them.
There are 2 filler plugs on left side of trans case, close to the left frame rail, square headed pipe plugs. Hard to get to with open end wrench. I use a 12 point socket & extension, think 7/8 on rear plug, 3/4 on forward plug. Use 80W-90 or 140 gear lube. Can fill in one plug, but takes some time for lube to pass the internal dividers, so quicker to fill at both plugs. Takes 17 quarts.

Fourth drain plug is Hydraulics & belt pulley drive, forward of PTO, but rearward of engine clutch. This compartment is NOT connected to the trans clutch/ trans/ diff compartment. Filler is also on left side, that little cap with dipstick attached. Use any hyd fluid or 20W engine oil.
There are pictures of drains & fillers in your operators manual.

E-mail is open if you have more questions.
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