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Minneapolis Moline Tractors Discussion Forum

M670 Super Power Steering Problem

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Author  [Modern View]

06-18-2020 19:34:07

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I have a late model (1969) M670 Super. Within about 20 minutes in the field, all of my power steering fluid is gone from the reservoir, obviously leaking out from somewhere. Problem is, I have traced as many lines as I can find and am unable to determine where it might be leaking. Is there a common place on these steering systems that leaks after years of use? Some specific place I should be looking for the likely source of the leak? The pump does not seem to be making any noise, I just get to a point where steering becomes difficult and I'm either really low, or out of fluid.

Any and all suggestions would be very much appreciated.

Thank you.

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06-26-2020 21:15:57

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 Re: M670 Super Power Steering Problem in reply to crashman111, 06-18-2020 19:34:07  
Thanks for getting back. Nice to know if I guessed correct.

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06-26-2020 10:34:05

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 Re: M670 Super Power Steering Problem in reply to crashman111, 06-18-2020 19:34:07  
ChrisQ, Thank you for providing me with the suggestion regarding the problem with my power steering. That appears to be exactly correct and I have an appointment to have it repaired.

Thank you so very much for taking the time to respond. I really appreciate it!

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06-18-2020 20:56:44

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 Re: M670 Super Power Steering Problem in reply to crashman111, 06-18-2020 19:34:07  
Steering piston seals are leaking and it is filling the cast steering gear under the radiator. Remove the plug on top of the gear, it has a dipstick on it from what I remember, it will be over full. I've seen a few plumb that fill plug back into the pump return so the gear runs overfull and keeps the pump full. Or disassemble and replace the piston seals.

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