Farm Equipment - 1941 AC QUESTION

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1941 AC QUESTION

Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=9249
Printed Date: 20 Jan 2025 at 11:50am
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Topic: 1941 AC QUESTION

Posted By: Larry Kuhnke
Subject: 1941 AC QUESTION
Date Posted: 10 Mar 2010 at 6:12am

I am restoring a 1941 AC. Tractor number is C4621, Engine number AM-2916-12.

Silly as it sounds, I cannot locate a drain for the transmission gearbox. Anyone know where it is located ? Also, the refill and gearbox oil type ? Thanks

Replies:

Posted By: GlenninPA
Date Posted: 10 Mar 2010 at 6:40am

clean the crud off the bottom of the differential and the transmission. the plugs are on the bottom, use a 3/8 socket extension to loosen them as they are female drive.

Posted By: Ken in Texas
Date Posted: 10 Mar 2010 at 7:09am

Did you look on the bottom of the Transmission/Differential case. There are 2 pipe plugs at the lowest points of the case. If they are in all the way in they sometimes are flush with the case and covered with hard dry grease crud. Dig the crud out of the square hole in the plug and use a 3/8 drive wrench to remove. If it has a pto and most do it also has a plug on the bottom. To get a complete oil change all three plugs need to be out. Old manuals call for SAE 20. I use 90. It keeps the whine to a minimum if the tranny gears are worn. Most everyone who uses their hydraulics just uses modern Trans/Hydraulic fluid. I believe the capacity with a pto and hydraulics is 7 quarts. I find it easier to fill the case fast is to pull the shifter and pour new oil in thru that top hole. Be sure the level check plug is in or half of the new oil will pour out on the ground before it flows back to the PTO

Thats a pretty early C and should have hand brakes if still original. These early ones were called short arm Cs because the steering arms on those Cs after #18163 were longer.

What you are calling the the Engine number is actually the engine block casting number. The 12 indicates it was cast in 1940 and is probably the same engine that came in the tractor when new. The engine SN is in the top of the left side engine flange where it bolts to the clutch housing. It should be a CExxxx G if gas. K if kerosene or dual fuel

Posted By: Ken in Texas
Date Posted: 10 Mar 2010 at 7:14am

I'm A slow H&P typer and old Glenn beat me to my more detailed reply. I hope I have been a little help. In case you are wondering what H&P is. Its Hunt and Peck.

Posted By: GlenninPA
Date Posted: 10 Mar 2010 at 10:00am

But Ken gave you the whole story...

the only other thing to add, is make sure your bucket is big enough to hold all the water that will come out with the oil that is in there... (usually) LOL