[AT] MF 255 power steering

[Len Rugen]

It doesn't work as it should, even cold.  It's usable when your ground speed is OK, just like the old days of manual steering, it's slow maneuvering that is a problem.   The steering wheel is very hard to turn, either direction.  Since it probably ingested the old screen and whatever grit may have been in the system, I figure the pump body is scored. 
The last pump I found was $750, now I'm finding them for under $300.  

Len Rugen

rugenl at yahoo.com


 

    On Tuesday, October 11, 2016 7:21 PM, Spencer Yost <yostsw at atis.net> wrote:
 

 I once had this problem in the 1970s with a truck where the cheap,  riveted pulley/sheave separated and was replaced.  The replacement was wrong and did not turn the pump fast enough at low RPM's.  It was pretty obvious and so your situation sounds different but just a thought.  

ATF works better warm.  Might give that a try instead of PS fluid.  Make sure all air is out of the system.  A fluid swap is a good time to do this.

I am not crazy about the pump idea. My experience is they fail at all temps or at least exhibit some subset of symptoms even when cold. But I'm not  terribly experienced either, so take that with a grain of salt.

I hope someone with more experience jumps in....

Good luck!

Spencer Yost



Spencer Yost
> On Oct 11, 2016, at 4:11 PM, Len Rugen <rugenl at yahoo.com> wrote:
> 
> My MF 255 is one of the later models with the AD236 Diesel, but I don't know if that matters on the power steering parts.
> 
> It has always been hard to steer at slow RPM after it gets warm, it was usable, but now it's getting worse.  I've had it several years, when I got it, the inlet screen in the power steering pump was damaged, so not straining anything, I replaced it the screen at that time and put in mostly new fluid, I'm sure some was left in the system I didn't get out.
> I've found a new pump for less that I could get the tractor hauled to the dealer.  What are the odds that a new pump will fix it?  Anyone care to venture a guess?  
> 
> Len Rugen
> 
> rugenl at yahoo.com
> 
> 
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