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Minneapolis Moline Tractors Discussion Forum
Show Parts for Model:

Re: Power Steering on a 670

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Kurt Smit

06-07-2013 12:38:11
148.168.96.24



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My 670 is leaking fluid on the left side of the power steering unit. I have had it apart twice and put new orings on both times and it still leaked. Is this a special o-ring? I also thought it could be the line, so I took old one out and braized a new one in and it still leaks. Has anyone ever had this problem?
Thanks,
Kurt




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Kurt Smit

06-10-2013 09:59:22
148.168.96.24



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 Re: Power Steering on a 670 in reply to Kurt Smit, 06-07-2013 12:38:11  
I'm not sure if is a Ross gear or not, but it is definately leaking around the O-ring. I may try to get a square cut O-ring to try instead, there is a lot of grove left with the standard O-ring installed.



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Alan K

06-10-2013 10:41:56
208.83.191.64



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 Re: Power Steering on a 670 in reply to Kurt Smit, 06-10-2013 09:59:22  

This is the steering valve that is on my M5. Your M670 should be basically the same. There were some changes on the early M5 valves and the later M5 ones, mainly O ring placement in the valve its self. You could possibly try a thicker O ring, unless somehow you are getting oil pressure leak when the valve moves. Does it leak without moving the steering wheel? These always seem to be a trouble spot on these tractors. Ive heard stories of some of them not work properly when new.

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Kurt Smit

06-10-2013 12:44:58
148.168.96.24



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 Re: Power Steering on a 670 in reply to Alan K, 06-10-2013 10:41:56  
I guess I'm not using the proper terminology. My 670 is leaking from where the fluid goes in to move the piston (left side of tractor, under the nose tin). There is about a 5 inch metal cap/plug that is held in with a snap ring. The hydraulic/power steering line enters into the ceter of it. Fluid leaks out of there when it is running or sitting. The line was quite rusty so I replaced it (the old one was braised in and so is the new one). Anyway the fluid appears to be leaking around the O-ring. I have replaced the O-ring twice, but it still seeps.
Kurt

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Alan K

06-10-2013 17:15:47
208.83.191.64



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 Re: Power Steering on a 670 in reply to Kurt Smit, 06-10-2013 12:44:58  
Ok. The only thing I can think of at the moment is if there is a small edge or burr that cuts the O ring on installation. Ive replaced the ones on one of my M5s and it still seeps a little.



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Kurt Smit

06-10-2013 10:00:58
148.168.96.24



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 Re: Power Steering on a 670 in reply to Kurt Smit, 06-10-2013 09:59:22  
Oh, it is not a super 670, but aside from the steering leak, it is pretty darn good!



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Alan K

06-07-2013 18:02:11
208.83.191.64



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 Re: Power Steering on a 670 in reply to Kurt Smit, 06-07-2013 12:38:11  
If its the Ross brand valve on the non super 670, they are prone to leaking out around the steering shaft. I have one M5 that the steering works good but it leaks some. The other M5 I rebuilt and it doesnt leak, but needs adjusting as it doesnt work properly. There has to be a small amount of play in the shaft for it to work properly and most of the time that includes a leak.



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