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They do have a measuring tape in this picture, although it's not perfect it looks to me like maybe 5". https://www.easternsurplus.net/Documents/Pictures/cropped-2530-01-388-4240%20Air%20Assist%20Power%20Steering%20Upgrade%20Kit%20for%202%20and%20half%20ton%20trucks%20NOS%20(2).JPG

Although I can't find the air assist bore diameter, I can do some sanity checks. Things known: -Proposed hydraulic cylinder is 2" bore, 1.25" rod. -Proposed hydraulic pressure should be approximately 1500psi. -Peak air pressure in my deuce seems to be 90psi. With those givens, I have a peak...

I agree completely, I'm just trying to run some numbers. (Air PSI)*(Air cylinder in^2)=linear force pounds Which would be a great starting point for the same calculation with a hydraulic ram. 7bdiver used a double-ended hydraulic ram with a 3" bore, granted the rod takes away from that surface...

Just to preserve the information, I found the following while looking at tractor parts: http://www.straightlinesteering.com/Control%20Valves,%20Cylinder%20and%20Steering%20Cylinders.htm From what I can tell, these drag link servo valves are mostly intended for aftermarket PS installations on...

I've still been keeping my eyes peeled for a multifuel PS pump that's a bit more budget friendly, may still end up with a belt driven pump. Does anyone know what the cylinder bore is on the air assist kits? I'm trying to figure up if a 2" hydraulic bore would be sufficient. 3" bore does seem a...

Thanks ldmack3. Yeebus, by the time you get the adapter mount and gear, that bad boy makes the Eastern Surplus one look cheap. I'm considering a pump from a Chevy C60 or other midsize dump truck. Gear drive would mean one less belt to keep up, but I can get the C60 pump local for <$100. I'd...

Other than Eastern Surplus, anyone have good leads on where a guy might come across a good condition 5 ton PS pump? https://www.easternsurplus.net/PartDetails/2172/COM-5336-5-Ton-Multifuel-Power-Steering-Pump

So here's the air assist kit instructions: https://www.steelsoldiers.com/threads/air-o-matic-air-assist-steering-instructions-scanned-blue-prints-12132493-12430289.122674/ Thanks very much to the folks who contributed those documents, that helps a lot. I can definitely see why someone would want...

Wow, thank you, thank you, thank you! That's great that someone else already blazed the trail on this. I could be completely off, but for a single ram, couldn't you make a bolt-on tang plate rather than welding to the differential? My understanding of the air assist kits is that they were...

I should explain further, these valves are intended to accomplish the same task as the torque valve in the air assist units. They servo the hydraulic control based on the torque measured in the steering shaft. Since this is mechanically coupled from input to output shaft, it would allow you to...

Hi all, In doing some napkin engineering for a DIY pneumatic assist steering torque valve, I ran across this: https://www.howeperformance.com/parts/control-valves/ Coupled to the appropriate PS pump and cylinder (clamped to the tie rod similar to the M35A3), this could be a very simple hydraulic...