M hydraulic question

[Fred47M]

Well I had accepted that I would have to do something with the belly pump on my 47 M. but read a post about different tractors pressures and cylinder size. Anyways I put a loader on it, would only lift about 250lbs, and drop with lever with no resistance. I wasn't able to use original cylinders, badly rusted. The original IH 33 cylinders have a 1 3/8 rod in a 2 1/4in I.D bore. The replacements came off farmhand on I was told for WD45 1 3/8 rod and 1 7/8 O.D cylinder. Is that a significant of a difference to cause this. Engine does react when a try to lift more. First time I tried to use pump on this tractor. New hyd oil, plumbed separately, front ports Thanks

 

[Bob]

ASSUMING you mean the "new" cylinders have an I.D. of 1-7/8", the original cylinder pistons would have an area of 3.97" and the "new" cylinder pistons would have an area of 2.75", QUITE a difference.

 

[Duner Wi]

Never had an WD45 but I seem to remember they made lots of pressure. More than 3000lbs I think.

 

[Janicholson]

The diameter difference makes radical lift difference. The M probably makes 750 to 850psi. with the leverage on the cylinder, and 60+ years of age, it is not going to lift much. If the Allis cylinders are 1-7/8 OD as stated. they are even smaller than usable at those pressures. Cylinder time. Surplus Center might be a source. Jim

 

[jhncp]

Single acting cyls? Seals maybe shot in cyls

 

[Fred47M]

Thanks guys

 

[Ellis Kinney]

Try 30 weight non detergent motor oil. Sold @ AutoZone. You might be surprised. I had a neighbor with an M and a wheel disc. He was complaining about how he could only lift the disc a little bit off the ground and the pump would whine. I asked him if he trusted me and he said yes. He bought 7 or 8 quarts of 30 wt. and we switched over and emptied the line and cylinder. The disc came off the ground like the pump was brand new. Good Luck, Ellis

 

[DTK]

Allis Wd45 is high pressure you need cylinders designed for low pressure.