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Problems with Allis Chalmers Model B

J

JerryW

New User
I acquired a 1946 AC B model along with a cabin I recently bought. The previous owner had passed away, and a neighbor said the tractor was used occasionally. It has some problems and I could use some advice.

I put in a new battery and fresh gas and got it started. It took a few tries because it sounded like the starter was not fully engaging the ring gear. Need a gear relacement? When it did engage it turned over fine.

I tried the PTO and hydraulic lift. The PTO worked, but the lift didn"t. I checked the oil level - unscrewed the big plug on the lower left of the transmission housing and the oils a milky white color. Not good. Related to the non-working lift? I"ll drain the transmission tomorrow. What kind of fluid should I refill with and how much will it take?

Other than the occasional grinding start and the milky oil, the tractor has nice sheet metal, new tires, and runs nice. Thanks for your help.
 
The starter grind is a common ring gear being rough problem. Engines stop in the same place about 95% of the time so one place gets hammered more so it gets rough. Bet if you turned the engine a 1/4 turn it will not do that but as I said common and the only fix is to replace the ring gear, Me I leave it as is and live with it.
As for the hyds yes the milky oil could cause the problem. You did have the PTO spinning when you tried it right?? PTO has to be spinning to have the hyd work. As for oil I use the UTF type hyd fluid in my C and works just fine
 
hydraulic valve parts and orifices get plugged or stuck with dirty oil. Drain it out -- 3 of 1/2 inch pipe plugs on the bottom-- drain all 3. There will still be some residue inside so when you fill and run you will still see some "white" but much diluted. Leaks around the shift lever from setting outside are the most common problem. Use universal tractor fluid, hy trans, or 10 wt hydraulic fluid.. etc. Dont use anything over 20 wt thickness, it tends to cavitate the pump and make things work harder.
--On the starter, pull the starter and make sure the bendix spring is good and helping engage / disengage. Look into the starter hole and the ring gear and you will get an idea. Old is right, the motor always stops in the same spot.
 
To expand on what Old said, you could heat the RG, and move it, about 2-3 inches, with a punch, and have the flat spots moved a little, but for all that effort, a new ring gear doesn't cost all that much!
 
More on the starter- could be a couple things. Yes, the motor usually stops in 2 possible spots, 1 & 4, or 2 & 3 on upstroke. Bad spot on ring gear is one possibility. Drive unit, commonly called Bendix, could be bad or just dirty/rusty from sitting. Drive should be squeeky clean & DRY, no lube of any kind on it. Quick, easy & costs nothing to pull starter to check it out. While the starter is out, take a good look at teeth on ring gear.
HTH
Willie
 
Thanks for all the good information.

To follow up, I didn't realize that you had to have the PTO engaged for the hydraulics to work. Before I tried it again I drained the fluid and refilled it with new. When I tried the lift it worked, but how do you get it down again? I hung a weight on it thinking maybe it would pull down, but it didn't budge. Something else I'm doing wrong? Maybe I need a heavier weight, I just used a tire and rim.

Thanks for any help you can give.
 
most wont float down by itself, but if you stand on the 3 point arm, or have a blade on it for weight, it should drop. If not, you have something stuck on the valve. Look at the side of the valve and notice a wobble plate that moves about 90 degrees when you pull the lever to raise. Push it to drop and have someone watch, it sould go further the opposite direction. There may be a spring broke or plates stuck at this position..
 
Orig manual specs 20w oil in the trans, most use universal Hy-tran fluid. If you put 80-90w in it the hydraulics wont work right.
 
Keep a good boot on the shift lever to keep water out of the transmission. Take the pans off of the final drives, clean the crap out of them and put new 90 weight gear oil in them. Nobody does this and they can be pretty ugly in there.
 
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