Posted by David G on August 30, 2015 at 17:40:24 from (75.167.202.204):
My MH 44 has a 6.3 GPM capacity hydraulic pump (if in good shape), I used a 3 GPM priority valve for the steering. It steers real crappy at low RPMs, so I did the math.
The pump gear turns at 110% of the tractor RPMs. The tractor must be running 725 RPM before the minimum supply flow for the steering is met. I would be concerned if running a priority valve on an older tractor with low flows, like I did.
I looked into upgrading pumps, and have some info from that. I am lucky, the pump on my MH is a standard SAE A flange, so it is easily replaced. The current pump calculates out to .975 cu. per revolution. Pumps are sold by the cu in per revolution. I found a prince pump for about $200 that fits the flange and will supply 10.5 GPM, or about the same output as my tractor before the power steering was added. I can bore the old gear out to match this, press it on and good to go.
Bottom line, I think an engine driven power steering pump is best option on older tractor.
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Today's Featured Article - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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