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Tractor Talk Discussion Forum

Ford 8000 power steering.

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Ty Lee

10-06-2005 12:20:18




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I am having problems with my saginaw power steering on my Ford 8000. Last week while operating it the small aluminum case (part of the power steering pump on the side of the motor) crack and fluid shot every where. It ths case the the two small gears turn in. I replaced the casing with a used one. When I put it all back together the steering was very hard. I did notice that when I ran the motor at a really high RPM it did work a little. I thought maybe the system needed bleeding but later read it was a self bleeding system. It all worked fine before that case split so I can't figure out why it won't work now. Can anyone help me with this? Does anyone know why that case would crack in the first place? Thanks

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Bob

10-06-2005 12:30:49




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 Re: Ford 8000 power steering. in reply to Ty Lee, 10-06-2005 12:20:18  
You would have been better off replacing the complete pump, as the gears and housing are almost like a matched set, especially after wearing together for a while. Typically, you can not buy individual pieces of pumps as service parts for that reason.

Why did it break? Metal fatigue from years of pressure pulsations, or POSSIBLY a stuck relief valve.



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Ty Lee

10-06-2005 13:07:10




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 Re: Ford 8000 power steering. in reply to Bob, 10-06-2005 12:30:49  
Bob, That is actually what I did. I got an entire used pump system. When I got it I was only going to use the case but I realized it was off a new model because the case was about 1/8-1/4" smaller and my gears would not fit. When I put it together it did the same thing I said earlier. So I took the end where the hydraulic line come in off my old pump and switched them out thinking that maybe there was something wrong with it but I had the same thing happen. Do you have any other ideas?? It doesn"t seem like there is a whole lot in that pump for something to go wrong and it worked fine before that case split. Is it possible that something else went wrong with the system at the same time.

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Bob

10-06-2005 14:03:15




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 Re: Ford 8000 power steering. in reply to Ty Lee, 10-06-2005 13:07:10  
The replacement pump may be worn out or improperly asssembled. Was there a flow control/bypass valve in either of the outlet fittings you swapped?



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Ty Lee

10-06-2005 15:47:29




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 Re: Ford 8000 power steering. in reply to Bob, 10-06-2005 14:03:15  
I assembled the pump the way I took it off. There's not a lot to them. I didn't mess with the rear cover that contains the control valve. I thought there may have been something worn in the I got from the salvage yard and that's why I later reinstalled my rear cover and had the same problem. Could the filter be plugged even though it worked fine before the case broke.



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Hurst

10-06-2005 17:08:55




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 Re: Ford 8000 power steering. in reply to Ty Lee, 10-06-2005 15:47:29  
It could be a problem with the steering motor. They are expensive but the valves inside it can develope problems. I would check that out too. A pressure check if possible would help eliminate certain things. Good luck

Hurst



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Ty Lee

10-07-2005 05:37:53




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 Re: Ford 8000 power steering. in reply to Hurst, 10-06-2005 17:08:55  
If there is a problem with valves in the steering motor can they be fixed? Where to you check the pressure, is it at the pump? I talked with a dealer yesterday and he said those pumps have really tight tolerances. I noticed that the salvage pump I installed had some minor wear or scaring inside the case where the two gears turn. Could this cause the pump to not create enough pressure? Is this why when I run the tractor at a high RPM the steering starts to work a little bit. Would it be a waste of time to try a different pump because they have more. When the tractor is moving it appears to steer just fine. Would it hurt anything if I ran it the way it is or will I do damage to the steering motor of other parts because maybe there isn't enough fluid flowing or pressure? Thanks for the replies, all info is helpful. I just not familiar with this system. The thing I can't figure out is it worked fine until the pump case crack which makes me think that the problem may be just the pump is not fuctioning properly. I hate to buy a new pump just to fing out that wasn't the problem. Dealer tells me to switch the system to a Ross system, $2700 new or $1000 used.

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RodinNS

10-07-2005 06:54:59




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 Re: Ford 8000 power steering. in reply to Ty Lee, 10-07-2005 05:37:53  
If the gears have started to cut the housings, then it's time for a new pump. That sounds like the case here, as you suggest that it works better at higher RPM's. Otherwise, there could be a malfunctioning relief valve or flow control valve.
As Hurst has suggested, there could be a problem with the motor as well, but I have my doubts in your situation. The motors have a lot of small parts that make them look complicated, but in reality they are quite simple, and there isn't a whole lot to go wrong. To pressure test, you would need to "T" into the output line from the pump, then run the wheel over to the lock to make pressure, and see what it reads. This being done with warm oil.
However, if you know the housings in the pump are worn, then that's as good a bet as any. I'd probably just buy a new pump. HTH.

Rod

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Ty Lee

10-07-2005 07:14:06




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 Re: Ford 8000 power steering. in reply to RodinNS, 10-07-2005 06:54:59  
Is it easy to tell if there is something wrong with the relief valve or control valve. Can I just take them out and inspect them or will it be hard to determine if they are bad. I think it may be the gears have worn the pump case too much. I just wanted to eliminate any other possible problems or something easy that I was just missing. Thanks



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RodinNS

10-07-2005 14:46:10




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 Re: Ford 8000 power steering. in reply to Ty Lee, 10-07-2005 07:14:06  
I haven't dealt with those particular valves, as I've not had a reason too. But, in general, a ball type relief valve can have a bad seat or simply have some dirt on the seat that will prevent proper closure. Just take it apart and look at it. If there's a problem, it should be obvious. Relief valves also tend to chatter a lot when they are blowing off. The ball will chatter on the seat as it opens and closes rapidly. I would expect that the pump gears/housing are your problem. This would not be at all uncommon. These pumps are not noted for durability.... HTH.

Rod

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Ty Lee

10-11-2005 12:23:24




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 Re: Ford 8000 power steering. in reply to RodinNS, 10-07-2005 14:46:10  
Thanks for the help I got it fixed this weekend and back to farming. The problem was with the case and gears. I put another used pump that was in good shape on and it works good. However the pump does get really hot. Never noticed before because I never had a problem with it. Should those pumps get hot??



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