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Farmall & IHC Tractors Discussion Forum
Show Parts for Model:

IH 300 UTILITY POWER STEERING PROBLEMS

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HOWARD HUGHES

05-12-2008 14:19:14
64.12.116.73



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Help!! My IH Utility 300 was driving fine until I parked it for about 6 mos. When I went to use it I had no power steering.
My lift cylinder in the back works fine. Where is the power steering pump. Is it in the transmission? (I would like to change my trans. fluid. I purchased an Oper. Manual, but it only says use IH Touch-Control Fluid. Is that just hydralic fluid I can purchase at any parts house or 90wt or what?)
Back to the steering. I found a plug by the steering column under the hood behind the battery. I removed it, stuck a pine straw in and got what appeared to be hydrolic fluid. Is this a separate resovoir for the steering? I have a Henry TS 50 front end loader on tractor. I lowered bucket lifting front wheels off of ground and moved wheels lock to lock hoping to work out maybe air. No luck
Any and all advice will be appreciated. We had an F2 tornado in Jackson Miss on April 4 and I really need my tractor to help in clean up of many huge down pines.

Thanks,
Howard Hughes
Jackson, MS 601-956-3645
Fax 601-978-3697
Cell 601-260-5889
hijhoward@aol.com

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Rnie

05-13-2008 20:13:23
209.172.23.43



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 Re: IH 300 UTILITY POWER STEERING PROBLEMS in reply to HOWARD HUGHES, 05-12-2008 14:19:14  
I have 2 300U for 12 years.

Actually the 300u/350u IT manual does a good job of explaining and trouble shooting ps.



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big fred

05-12-2008 20:10:59
216.223.7.105



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 Re: IH 300 UTILITY POWER STEERING PROBLEMS in reply to HOWARD HUGHES, 05-12-2008 14:19:14  
Howard, the plug you found, if it's on the steering gearbox and not the transmission, should be for the gearbox oil, which should be something like 90W gear lube, not hydraulic fluid.

I don't have an answer for why your P/S isn't working if your lift cylinder is. The P/S should be getting pressure even if the lift isn't, because of the priority valve (which is probably mounted just inboard of the lift cylinder valve, between that valve and the seat base). It may be that there's something in the priority valve that's messed up, or it could be the power steering cylinder, which is on the right hand (passenger side if it was a car) half of the power steering gearbox, or it could be in the power steering valve, which is inside the steering column.

I haven't had my priority valve apart, but I've rebuilt the steering gearbox on my 300U (I actually have a 460U gearbox, which is very similar and an easy replacement if you need to replace a 300U or 350U gearbox). The gearbox is pretty simple, all the complicated parts are in the column valve, which I also haven't had to get into. If you do need to rebuild the steering column valve or priority valve, I'd recommend getting the IH manual for the steering system, and probably the parts book as well. The parts book has about the best exploded views you're going to find. The I&T manual for the 300U is pretty sketchy on the power steering unit, and is only adequate for adjusting the steering and setting backlash on the steering gearbox.

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HOWARD HUGHES

05-13-2008 11:30:29
64.12.116.73



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 Re: IH 300 UTILITY POWER STEERING PROBLEMS in reply to big fred, 05-12-2008 20:10:59  
Big Fred,
I just checked my reservoir under the seat and it is full of good clear fluid. So low fluid is not the problem.
Also, my 300 does not have a steering "ram" the ram must be inside of the steering box.

Thanks for your reply and advice, if anything else comes to mind drop me a line. I may be looking for a hydrolic shop.

Howard Hughes
hijhoward@aol.com



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big fred

05-13-2008 18:02:53
216.223.7.105



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 Re: IH 300 UTILITY POWER STEERING PROBLEMS in reply to HOWARD HUGHES, 05-13-2008 11:30:29  
Yes, the steering cylinder is "inside" the gearbox. If you look at the gearbox from the "passenger" side, you'll notice a protrusion sticking out the back side with a couple of hydraulic lines running between it and the steering column. That's your steering cylinder, has maybe a 4 inch stroke, but about the same bore. Inside the gearbox it's attached to a rack that meshes with a gear sector on the right side output shaft.

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Paul in MN

05-12-2008 16:25:00
71.210.151.213



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 Re: IH 300 UTILITY POWER STEERING PROBLEMS in reply to HOWARD HUGHES, 05-12-2008 14:19:14  
Howard,

Sorry to hear about the tornado and the havoc it must have left in its path!

I have had a 300 U for about 25 years, and have some of the answers you may be looking for. The PS oil is supplied by the one and only tractor hydraulic pump located near the right front of the engine. The pump is just ahead of the distributor. The hydraulic pump draws its oil from the big square resevoir beneath the operator's seat. It should have a dipstick attached to what looks like a pipe plug just under the front edge of the seat. You fill hydraulic oil into that same plug hole. You should be using the Case IH hytran fluid. Your PS gearbox has a small pipe plug for filling with gear lube...90 wgt. It needs both the gear lube and the pressurized hydraulic fluid supplied by the hydraulic pump. If your lift hitch goes up with lifting power, then your hyd pump is OK. I suspect the problem is in the PS priority valve, but other members of this board do understand the diagnostics of this better than I do.

Your tranny and rear end are partially filled with hy-tran oil. IIRC, there are 2 drain plugs, one small brass plug at the front bottom edge of the tranny housing, and the other a big pipe plug at the very bottom center of the rear end between the wheels. If your oil is milky color, then it has water in it and should be changed out. I think the tranny and rear end takes about 7 gallons of new oil. It is poured in a large pipe plug opening very close to the tranny shift stick. There is a small pipe plug near the left footboard that should be removed first so you can tell when you have poured in enough oil. Do not overfill, as it will come out the rear axle/wheel seals, and maybe the bottom clutch opening.

HTH

Paul in MN

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HOWARD HUGHES

05-12-2008 19:23:03
64.12.116.73



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 Re: IH 300 UTILITY POWER STEERING PROBLEMS in reply to Paul in MN, 05-12-2008 16:25:00  
Thank you so much, I'll start this trouble shoot tomorrow. I thought the manual that I bought would be much more detailed, but it just is not.

I let you know how I came out.

Howard Hughes



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