Ford 4630 power steering

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kenny thomas
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Ford 4630 power steering

Postby kenny thomas » Mon Jun 11, 2018 8:29 pm

1995 Ford 4630 4x4 last week the power steering just suddenly quit. Steering wheel just keeps turning either way. No fluid circulating in the pump. Pump fluid level is good. Took pump off tonight and filter is clean, gear is good and seems to be turning ok. What am I missing?
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Re: Ford 4630 power steering

Postby jltrent » Mon Jun 11, 2018 8:30 pm

kenny thomas wrote:1995 Ford 4630 4x4 last week the power steering just suddenly quit. Steering wheel just keeps turning either way. No fluid circulating in the pump. Pump fluid level is good. Took pump off tonight and filter is clean, gear is good and seems to be turning ok. What am I missing?


Could be the seal in the middle of the steering cylinder is bad......

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Last edited by jltrent on Mon Jun 11, 2018 8:52 pm, edited 2 times in total.
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Re: Ford 4630 power steering

Postby kenny thomas » Mon Jun 11, 2018 8:35 pm

Ok, tell me how to fix it, and why is the fluid not circulating in the pump
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Re: Ford 4630 power steering

Postby jltrent » Mon Jun 11, 2018 8:41 pm

kenny thomas wrote:Ok, tell me how to fix it, and why is the fluid not circulating in the pump


It could be the pickup screen plugged. Have you changed the hydro oil recently and what kind. The wrong kind of hydro oil will cause the brake liners to come a part and clog the pickup screen. Not saying this has happened, but I have seen it several times. Just throwing things out there.
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Re: Ford 4630 power steering

Postby jltrent » Mon Jun 11, 2018 8:44 pm

Also the pump my look good and act good, but no priming/pumping for some reason. That is about all I could think of since the fluid level is good.....somebody else probably will know. The guy that worked up at the Ford tractor place for years is like an encyclopedia on those tractors and every time I run into him I have a a lot of questions and he is brilliant.
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Re: Ford 4630 power steering

Postby kenny thomas » Mon Jun 11, 2018 8:51 pm

jltrent wrote:
kenny thomas wrote:Ok, tell me how to fix it, and why is the fluid not circulating in the pump


It could be the pickup screen plugged. Have you changed the hydro oil recently and what kind. The wrong kind of hydro oil will cause the brake liners to come a part and clog the pickup screen. Not saying this has happened, but I have seen it several times. Just throwing things out there.

You lost me here. The power steering only runs off it's own fluid doesn't it. Yes it's hydro oil
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Re: Ford 4630 power steering

Postby kenny thomas » Mon Jun 11, 2018 8:53 pm

jltrent wrote:Also the pump my look good and act good, but no priming/pumping for some reason. That is about all I could think of since the fluid level is good.....somebody else probably will know. The guy that worked up at the Ford tractor place for years is like an encyclopedia on those tractors and every time I run into him I have a a lot of questions and he is brilliant.

He is lots better than Google for sure
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Re: Ford 4630 power steering

Postby jltrent » Mon Jun 11, 2018 8:54 pm

kenny thomas wrote:
jltrent wrote:
kenny thomas wrote:Ok, tell me how to fix it, and why is the fluid not circulating in the pump


It could be the pickup screen plugged. Have you changed the hydro oil recently and what kind. The wrong kind of hydro oil will cause the brake liners to come a part and clog the pickup screen. Not saying this has happened, but I have seen it several times. Just throwing things out there.

You lost me here. The power steering only runs off it's own fluid doesn't it. Yes it's hydro oil
You are right on those I was thinking about newer ones. Seems like if not pumping it is the pump, especially since it has proper fluid in it, the gear is good and it is turning. Did you take a pipe loose or what to make sure it is pumping, fluid circulating in the pump. You might raise the front end off the ground and see if it will turns like it should then with the weigh off.
Last edited by jltrent on Mon Jun 11, 2018 9:00 pm, edited 1 time in total.
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Re: Ford 4630 power steering

Postby chevytaHOE5674 » Mon Jun 11, 2018 9:00 pm

Is the gear in the front timing cover that drives the pump intact and turning? Are you sure that the pump gear is actually turning the internals? There is a relief valve in the pump is it stuck? If you remove the pressure line off the pump and bump the key does it pump fluid?

I've seen the relief stuck. Seen the shaft shear off so that the gear doesn't actually drive the internals under load. Also could be in the steering orbital valve in the column.
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Re: Ford 4630 power steering

Postby kenny thomas » Mon Jun 11, 2018 9:03 pm

chevytaHOE5674 wrote:Is the gear in the front timing cover that drives the pump intact and turning? Are you sure that the pump gear is actually turning the internals? There is a relief valve in the pump is it stuck? If you remove the pressure line off the pump and bump the key does it pump fluid?

I've seen the relief stuck. Seen the shaft shear off so that the gear doesn't actually drive the internals under load. Also could be in the steering orbital valve in the column.

How will it act if the steering orbital valve messes up. With the steering wheel turning around and keeps turning kinda made me wonder?
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Re: Ford 4630 power steering

Postby kenny thomas » Mon Jun 11, 2018 9:06 pm

chevytaHOE5674 wrote:Is the gear in the front timing cover that drives the pump intact and turning? Are you sure that the pump gear is actually turning the internals? There is a relief valve in the pump is it stuck? If you remove the pressure line off the pump and bump the key does it pump fluid?

I've seen the relief stuck. Seen the shaft shear off so that the gear doesn't actually drive the internals under load. Also could be in the steering orbital valve in the column.

There was no fluid calculating in the pump but with the pump off i can hear it seem to be pumping as I turn the gear. The gear in tthe timing cover feels ok but how do I really tell.
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Re: Ford 4630 power steering

Postby kenny thomas » Mon Jun 11, 2018 9:08 pm

I'm gonna fix it no matter the problem but don't want to replace a pump and still have the same problem
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Re: Ford 4630 power steering

Postby chevytaHOE5674 » Mon Jun 11, 2018 9:21 pm

Just spinning the pump by hand it will probably pump even if the shaft sheared as there is no load on it. Checking the gears in the timing cover is easy take a small bar or screw driver and try to rotate them, they shouldn't move unless the engine turns over.

First thing i would do is pull the relief valve out and make sure its clean and nothing is stuck in it.
Second thing is pull off pressure hose and bump the key to see if it pumps anything
Third if no pumping, pull pump apart and check for internal failure.
If it's pumping then I would check to make sure the steering cylinder didn't come apart internally.
If pump is pumping and cylinder is good then orbital valve is the last and most expensive piece.

The steering wheel will turn around and around as the "stops" you feel normally are the cylinder bottoming out.
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Re: Ford 4630 power steering

Postby chevytaHOE5674 » Mon Jun 11, 2018 9:26 pm

Also on the pump gear behind the nut there is a keyway. If you still have the pump off now is an easy time to check it.
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Re: Ford 4630 power steering

Postby jltrent » Mon Jun 11, 2018 9:26 pm

Been googling for a few minutes and not a lot of good info. From what I can tell I think that model had the Hydro-static steering. The steering orbital valve is a good possibility and I still wouldn't rule out the steering cylinder as one thread I read that was their problem. Good info chevytaHOE5674.

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