MF202 Power Steering

Caryc

Well-known Member
I have a MF202 with the Z134 four cylinder gas engine in it. The old pump was leaking fluid into the engine so I put a new pump on it.

Am still having hard steering problems with it now. I had problems with hard steering and when I removed the reservoir cover the fluid was foamed up with air. After trying different fluids in it, I finally tried type A transmission fluid in it from advice I heard here on the forum. I am still having problems with it foaming up and hard steering.

What is causing this and what can I do to prevent it. I see no leaks anywhere in the system.

I drove it for a little bit yesterday and the steering was still hard. I did not remove the cover but I'll bet the fluid was foamed up
with air again.

The old pump seemed to work ok except for the fluid leaking into the engine problem. Any help would be appreciated.
 
(quoted from post at 17:17:57 07/18/17) Could be a bad "new" pump, the control valve could have developed a problem, maybe try to find a new seal for the old pump.

Great, a bad new pump for over $600. I couldn't find any seal for the old Cessna pump anywhere.
 
(quoted from post at 17:24:37 07/18/17)
(quoted from post at 17:17:57 07/18/17) Could be a bad "new" pump, the control valve could have developed a problem, maybe try to find a new seal for the old pump.

Great, a bad new pump for over $600. I couldn't find any seal for the old Cessna pump anywhere.



With parts anything is possible, I've gotten bad brand new starter solenoids, condensers, and other parts that were bad out the box. If hymie has the seal it would be easiest (hopefully cheapest) way to see if the new pump has a problem, or is the problem is somewhere else.
 
If you read my thread from last week I had the same exact issue. I will be creating another thread in a couple minutes with my findings. Possibly could be different with all the components involved but it sounds exactly like my situation. Not good.
 
(quoted from post at 19:51:16 07/18/17) I have sent you an E-mail....did you receive?
Wayne

Hello Wayne,

You listed the part number for your seal as
834089M1

The part number I have for my old Cessna pump is
1 021 972 M1

For the new Barnes style pump that I have in there now it is
1 751 651 M1
 
Yes the old number for the Cessna pump is 834089m1. The 1021972 is the same seal, and both these cross over to the new part number 1041794m1.
The Barnes pump has a totally different seal.
Wayne
 
(quoted from post at 09:51:28 07/19/17) Yes the old number for the Cessna pump is 834089m1. The 1021972 is the same seal, and both these cross over to the new part number 1041794m1.
The Barnes pump has a totally different seal.
Wayne

Thank you Wayne, I'll take your seal and send you an email for shipping costs and my address.
 
(quoted from post at 09:51:28 07/19/17) Yes the old number for the Cessna pump is 834089m1. The 1021972 is the same seal, and both these cross over to the new part number 1041794m1.
The Barnes pump has a totally different seal.
Wayne

Wayne, I have sent you payment for the seal. I'll also send you an email conformation.

There is no way I can measure the shaft that the seal goes on. Can anyone tell me how to remove the retainer nut that keeps the gear on? In the parts manual it's described as Nut, drive gear retaining (5/16" NF, Special).

First off, is that nut a right hand or left hand thread? And what does the "Special" refer to? Is this some kind of lock nut that is good for one use only? I also imagine that the gear is pressed onto the shaft, so it will be a pia to get it off.

Any help here will be appreciated.
 
Usually if was left hand thread the parts book would usually specify it as left hand. The one you have uses a cotter pin to keep the nut from coming off. A regular gear puller should get the gear off
 
(quoted from post at 14:26:21 07/20/17) Usually if was left hand thread the parts book would usually specify it as left hand. The one you have uses a cotter pin to keep the nut from coming off. A regular gear puller should get the gear off

The cotter pin is on the Barnes style pump drawing. It also describes the nut as self locking.

There is no cotter pin on the Cessna pump drawing. It just describes the nut as "special".
 
(quoted from post at 14:54:51 07/20/17)
The cotter pin is on the Barnes style pump drawing. It also describes the nut as self locking.

There is no cotter pin on the Cessna pump drawing. It just describes the nut as "special".



You are correct, my 2135 had the Cessna pump, and it had a lock nut on it (if I remember correctly it is right hand thread). The drive gear on the pump is on a tapered shaft with a key way. I think I still have my old Cessna pump laying around, but I forgot where.
 
Cary,

Have you looked for exterior leaks? The 202 is basically the same machine as my 35 Utility, and after I replaced the front seal on my pump (cessna style) I no longer leaked fluid into the crank case.

However, after about 10hrs of use, my steering started acting up again. My machine is oily, it leaks from all sorts of places. I found my hard power steering to be from a leaky junction block under where the steering column comes down. It's where the steering cylinders tie into the main pump system.

I haven't been able to fix it yet, as I can't even tell which line is actually leaking. Can't have the tractor down for too long as I use it very frequently. But take a look under there, see if you can find any oil residue/wetness on the main trans tunnel under the steering column. If so, you may have the same issue as me.
 

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