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Allis Chalmers Discussion Forum

WD45 Power steering question

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Brad Rising

09-28-2003 18:29:03

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I have a wd45 with a Massey Ferg. front end loader, that was added somewhere down the road. The hydraulic pump is on the front of the engine, aat the bottom, with the two hoses coming off it to power the loader,my question is, can I use that same hydraulic pump to power a power steering torque generator, when I remove the front end loader? The loader is coming off, and I just wanted to see what all I have to get to get a power steering system for the tractor. Also,when I take the loader off, can I just cap the two hoses off temporarily, and still run the tractor without hurting the hydraulic pump. Thanks in advance for the info, I Have fixed many things on our original WD45 with the info you guys have offered up on this webpage. Brad
(I can send pictures of the current pump set up if that's required to answer these questions)

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Rod (NH)

09-29-2003 19:08:20

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 Re: WD45 Power steering question in reply to Brad Rising, 09-28-2003 18:29:03  
Hi Brad,

I'll relay my own experience and opinions:

I have installed a Char-Lynn torque generator to provide power steering on my Oliver 77. I am using the front mounted (off crank) hydraulic pump that also runs the front loader. You can see my installation here.

Do NOT cap off the pump openings (I am assuming the pump is crank driven?) without disconnecting the drive mechanism. As Phill says, make sure you consider the reservoir; it may be in the loader frame. You also should consider where your existing system relief valve is. Mine is built into the loader control valve but yours may be a separate valve. You should always keep that in the circuit for general system protection against overpressure.

If you use your loader pump for power steering, you will likely need a priority valve with it's own internal relief valve. Loader pumps should generally have a capacity that significantly exceeds that required for power steering. My loader pump is 20 gpm and the torque generator uses only 3 gpm. The pump is constant displacement so 17 gpm has to go somewhere other than to the steering circuit. In your case, the excess (if there is any) would be sent back to the reservoir via the priority valve. The priority valve that I have (from Surplus Center) has an internal pressure relief set at 1500 psig to protect the torque generator. It is true that the generator is rated at 1000 psig but I have had no problem with it at a maximum of 1500 psig. Of course it only sees that much if the steering resistance is high enough; when the steering is at one of the hard stops, for instance. Normal operating pressure is significantly less than this. The internal relief valve in the priority valve ONLY protects the steering circuit so you need to keep whatever main system relief you currently have in place and functional.

third party image Rod

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Phill S. from MN

09-29-2003 09:32:47

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 Re: WD45 Power steering question in reply to Brad Rising, 09-28-2003 18:29:03  
It is very important that you DO NOT simply cap off the hydraulic lines going in and coming out of your pump (unless you don't want the pump anymore).

One line (usually the larger one) is the suction line coming from the oil reservoir, the other one is the pressure line coming out from the pump and usually goes to the control valve (usually 1 or 2 handles to control the loader). From the valve block there is a line that returns to the oil reservoir. This completes the circuit and allows oil to circulate from the tank to the pump to the valve and back to the tank.

If the valves are going to stay with the tractor, your best bet is to simply cap the lines going out from the control valve block. This prevents oil from getting out if you happen to move one of the levers. It is important to keep the pump suction and outlet lines connected to the tank and valve block.

The tank might be built into the loader frame, so if the loader frame comes off, the tank comes with. In this case, I would suggest taking the drive belt off the pump so it's not spinning. Spinning the pump without a supply of oil will wreck it for sure.

Hope this helps. If you have any more questions, just email me and I will try to help.

Phill S.

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Dave Grubb

09-29-2003 08:01:08

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 Re: WD45 Power steering question in reply to Brad Rising, 09-28-2003 18:29:03  
The Char-Lynn power steering torque generators were designed to operate using 1000 psi hydraulic system pressure. It may not take 2000 psi very long if that is what your loader pump pressure can deliver. It would not be a good idea to cap off the pump. The least thing to do would be to connect the inlet and outlet hoses together with them full of fluid.

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