Allis Chalmers B Hydraulic Questions

this is a B cylinder (very small- not much force for lift)

this was a big one bottom plow that i put a blade onto the plow beam. It had two small C cylinders. I tryed it with one, and it will barely lift. I later installed a WD45 cylinder.

steve(ill) wrote: the above is a CA tractor cylinder mounted on a  B

The only real difference I see between this one and mine is the two brackets that attach to the ram end of the cylinder.   Mine are curved more like hooks.  Does a CA cylinder "bolt" right up to the original mounts without much modification?

BTW  Fuel oil is slang for diesel fuel.It will kind of wash down the junk but still has limited lubricating properties.That's why it was suggested to not put any real load on whatever system you put it in to "flush".Buzzing around the drive or short trips on the road with only the tractor shouldn't cause harm.Drain and refill with proper lubricant.Likewise with the hydraulic system.

On a side note, I did get the lights rewired and a new switch put in and they work great, although my little 4-year old thinks he's responsible for getting them to work which is probably the case.  I also ordered a new sediment bowl assembly because my has been leaking full for days and has everything stunk up!

MilesGray (CO/KS) wrote: Welcome to the site! There are great folks on here that can help you with anything to do with AC tractors... When you use the hydraulics on the B you need 7 quarts of fluid, a quart to run the hydraulics.

Thanks.  You are correct, everyone on this site has been extremely helpfull.....and patient.

Yes it is.Commonly referred to as hy-tran oil.Basically all makes have used it in everything but the engine since the 70's. AC referred to "their's" as 821 power fluid.That # as well as other makes #'s are listed on containers.Today it says AGCO 821.

Good for you.Just remember  some have said the small B cyl may not lift much weight.

When changing hydraulic rams, calculate the piston surface area.  Use your high-school math formulas to determine how much SURFACE is being acted upon by system pressure... and then multiply that surface area by the pump's output pressure (around 3200psi or so) to determine what your linear force is.  Often, running a single, larger cylinder will provide more surface area than two smaller cylinders... just do the math... and realize, that since the pump can only move so much oil so fast, a larger-volume cylinder setup will take longer to make a full lift.

Tractors prior to the early-mid '60's commonly used high pressure, low volume hydraulic systems, and generally they were single-acting cylinders for operating things like dump boxes on wagons, lifting up sickle mowers, hay rakes, bailers, etc... ran at upwards of 3-4000psi at only a few gallons a minute.

Newer systems use a low-pressure/high volume setup... more like 1200psi... but 10+ gallons per minute.  Larger cylinders made up for the loss of pressure.

The 3-point hitch was a very substantially-protected Harry Ferguson patent until the early '60's... prior to that time, most major farm equipment manufacturers had some sort of 2-point lift system.  Most of these systems were not difficult to adapt to a 3-point system, so many older tractors were equipped with 3-point after-the-fact.

Don't immediately assume that your brakes need replacing-  take off the covers and inspect, but before yankin' 'em out, check-see wether the adjusters have any adjustment left... if they do, break the nuts free and tighten up the adjusters a bit... that might be all it takes to get you back in good graces with the stoppin'iron gods.

;-)

Good news, I hooked up the blade today and held my breath but the single b cylinder raised it with no problem.  I came up pretty quickly and didn't seem to struggle at all.  I also raised it all the way and killed the tractor and left it there for a while and it still didn't seem to bleed down any noticeable amount so I'm super happy and operational finally!  I tried to take a movie with my camera of it raising up and down but it was 18 megs so pictures will have to do for now but as soon as I can figure out how to take a smaller movie, I will try to upload it.  Thanks again for everyone that took the time to help me out.

Wow, that's sharp.  Congrats!

You guys are awesome! All of your combined knowledge is amazing! I know where to go for answers if I have any questions about my little B.     Scott

Your long lift arms are what helps you. Most of the kits are designed with short arms which require a bigger Ram to work. Congratulations on the B and the blade. Should work great for the intended purpose.