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General hydraulic question

A

Anonymous-0

Well-known Member
I've got an old farm tractor (IH240) that the hyrdaulic pump is rated at 13GPM. Was toying with the idea of adding power steering and bought an orbital valve. Unfortunately the orbital valve is only rated for 3-5GPM. (Yes, shame on me for buying without researching first.) Is there device one can plumb as an offshoot from the hydraulic system which can divert 3-5GPM only to my orbital valve?

I'm thinking maybe a priority valve, but before buying (more) useless parts want to make sure I'm on the right track.
 
The priority valve does just that. assures the correct available pressure and flow for the steering. Purchase an adjustable valve, or one designed for the system components you have purchased. Not an issue at all. Jim
 
Yes, but much depends if the new valve relies on an open-center, or a closed-center hydraulic system. If they match, you could plumb in a hydraulic splitter or a priorty-valve. I doubt it's worth the expense, though.

On some tractors, a diverter valve is use, and you get one system or the other, but never both at one time. An IH 3414 tractor with hoe uses such a valve. One way for power steering, and the other way for the backhoe swing to work. Never both at the same time.

I've seen several IH B-414s that got priorty valves added and power steering plumbed in - all from the same pump. But, when the factory installed power steering, they used a dual-pump instead.
 
got me wondering, isnt 13gpm its maximim rated capacity? in other words it doesnt put out 13gpm if there is not demand for 13 gpm, does it? otherwise it would seem that if the hydraulic pump was turning, and the tractor was being run without any hydraulic needs hooked to it where would that 13gpm go? it would blow something up wouldnt it? if the steering pump only needs 3gpm, wouldnt it only get 3gpm? i can see the rating as in this case if that system was cobbled onto a ford N the N's 2gpm pump wouldnt provide enough to run the steering pump, or am i all wrong?
 
GPM ratings are basically meaningless unless expressed along with RPMs.

Pumps are size-rated by how many cubic inches of oil they move per revolution.

Many companies though, post max ratings of pumps.

A typical pump called "13 GPM" is often around 1.4 cubic inches per revolution. 13 GPM at 2600 RPM, 10 GPM at 2000 RPM, At 1000 RPM, around 5 gallons per minute.

Variable-displacement piston pumps, like Deere uses in wheel tractors, are a different story.
 
If your tractor has an open center hyd system, Install an adjustable flow divider valve between the Hyd pump and valve stack. connect the adjustable port to the power steering and the other port to the original valve stack.

Using a adjustable valve allows you to pick the flow rate that fits your power steering needs, eliminates getting a fixed valve that feeds too little or too much to the power steering.
Have done this on several early IH tractors with the live open center pump. It works well
Adjustable flow divider.
 
With an open center hyd system when no hydraulics are being used, all pump flow is returned through an open port to the hyd tank.
An open center pump moves a fixed volume of oil all the time.

A closed center system has a special hyd pump that will reduce or stop pumping oil when the demand is less than the pump capacity. When hyd need is 0, the pump shuts down and pumps no oil.
 
Somebody please put up the contact info for Surplus (Hydraulic?) or whatever the second word in the name is- that's the best place to get this stuff, IMHO.
 
I"ve picked up a couple priority valves from PS systems on IH & JD combines in salvage yards.
 
You don't need one of those adjustable types. You can get flow dividers that give a 3 to 5 GPM priority flow and anything over that goes to the other circuit. You'll also need another relief valve as power steering is usually a lot lower pressure than the main hydraulic circuit. Dave
 
I guess I'm understanding it the same as you ericlb, wouldn't that just restrict it down if that's all the P/S needs.
 
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