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IH 350 hydraulics

A

AndyCurnes

New User
Need some help here with hydraulics info on this IH350 tractor. Where does the power steering pump get its fluid from, and where exactly is the pump located. Wondering also what the pressure should run off the pump, and volume in reservoir. Also maybe where to purchase controls for the lift arms on back. Thanks Andy
 
I think the 350 has the same hydraulic system as a 450 which I am familiar with. The power steering runs off the pump in front of the distributor (if it has a gas engine). The pump draws its fluid from the reservoir on top of the transmission below the fuel tank. It holds around 5 gallons, more or less. The oil from the power steering is returned to the reservoir on the left side at the bottom of the reservoir. FYI there is a screen filter on the right side at the bottom of the reservoir that has 4 bolts holding it in place. If this screen is clogged, the power steering and hydraulics will not work properly. Pressure from the pump should be 2200 to 2500 psi. if I remember correctly. I would try a salvage yard for the hydraulic controls.
 
Is that an IH 350 utility or a Farmall 350? If it"s a utility the reservoir is under your seat. Hydraulic pressure is 1200 psi when new for either kind.
 
Here again is where the "tracing" technique might prove handy.

There are multiple ways which these tractors got hydraulics for the power steering. One common way is a separate pump mounted to the front of the engine, for the aftermarket power steering. I assume since you say power steering pump, that you have one of these.

Follow the hoses from the pump. It's that simple. In most cases, one hose will go to the power steering motor up under the hood, and the other will go to the hydraulic reservoir.

If both hoses go to the power steering motor, the reservoir is built into the pump. It will be just like checking the power steering fluid on a car/truck.

Sometimes the hose will go to a separate reservoir hidden up under the hood.

Sometimes the hose will go to the drain plug on the tractor's own hydraulic reservoir.

If the tractor does not have a separate power steering pump, then it uses a priority valve to siphon pressure off the tractor's main hydraulic pump.
 
The hydraulic reservoir is nowhere near 5 gallons. Maybe 2 gallons or less. Completely full my 4" loader cylinders will empty the reservoir on my 350 when I raise it all the way.
 
I believe the power steering was on the tractor since birth. Its not a add on. The old girl when I got it had a bucket on the front, and a backhoe on the back. The hydraulic fluid was in the frame work and then ran off different control spools on the right side by the steering wheel. I have two hoses now that go no where, but end up in the power steering under the console and hood. I was wondering if they ran around to the reservoir under the seat too. Is that where the pump would be. It doesn't look like the fill plug has been out in 57 years, since I believe its a 1957 model. Just not wanting to send this old tractor to the scrap yard. Engine purrs.
 
On a 350U or a 300U, the PS reservoir is the hydraulic reservoir that the seat is mounted to. The pressure comes from the same pump as the hydraulics, which is in front of the distributor. The PS unit is supplied from a priority valve which ensures that your steering gets pressure even if there isn't sufficient pressure or flow for the rest of the hydraulics. That's a safety feature. I believe the volume in the hydraulic reservoir is on the order of 5 to 7 gallons.
 
The original steering pressure came from a priority valve from the side of the reservoir under the seat.
The pressure came from the engine driven pump ahead of the distributor. If the priority valve is not working, or the engine driven pump is defunct, fixing that will work, or putting a priority valve in the discharge line of the front mounted pump will work.
Another option is to add a power steering pump from a medium duty truck. driven from the fan belt, or other belt system, it will make the power steering work. Jim
 
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