I think you may have something there. Definitely check for any restrictions in the lines.
I can relate, I've been showered more than once by hydraulic fluid from various places on my old tractor. Consider it your initiation! Not to make fun though, all the time and effort put in being rewarded like that is disheartening.
Hey big red or anyone who has a MF202, take a look at the pic below. The pressure out of the pump comes out the bottom port.
Which of the lines in the pic are for pressure in? Is it the left or right one? I have like four manuals on this tractor and nothing actually shows a clear of which is which.
The valve that it covers has little spools and springs (I think you remember). On my cover there were very slight indentations which allowed the tiny spools to go into the cover...again slightly. They only line up when the cover is put on correctly. The question is, could this be the source of your problem? I have no idea what would be impacted by the spools not being allowed to rise.
There are number of things to check and while I know what to do to check and make sure its correct, I do not have the experience to tell you in all cases what will happen if it is wrong.
You might be able to get in there without removing things. Don't recall if you can access the 3 bolts without removing the dash.
If you have not yet checked the return for blockage, I would to make sure that line has not collapsed internally. Mine is steel from the valve and for about 18".
If you want to talk by phone we can do that.
When thinking about your history. What just took place has not happened before. You had leaks but not at this level.
If it were me, I would have to be thinking about the seal and if I recalled for sure putting it in the correct way. If you do not need to remove the dash and have a mechanics mirror, confirm you can see the lip. If you see the back/flat side its in wrong.
If it were me, I would have to be thinking about the seal and if I recalled for sure putting it in the correct way. If you do not need to remove the dash and have a mechanics mirror, confirm you can see the lip. If you see the back/flat side its in wrong.
I put the seal in the correct way with the spring side towards the oil In other words when it is all assembled, the spring side of the seal is facing down. I'm going to check in a few hours whether or not I can loosen and turn that outer cover without removing the dash again.
Really sorry to hear it didn't solve the problem.
When the smaller sleeve went on, did it take force that could have deformed it? Did you check the seal lip against the sleeve for fit?
Where you able to confirm the seal lip location installed in the cover against the surface area of the sleeve to insure that the seal was on the sleeve surface?
I used a height gauge to determine where the sleeve went on in relation to where the seal was measured from the face of the outer cover.
While trying to understand a little about this power steering, Would it be normal to start up the tractor with the wheels facing straight ahead and have the fluid start coming out of the steering column?
In other words is that same pressure still in there even though I am not turning the wheel taking advantage of the power steering?
Without touching the steering wheel, starting the tractor and letting it idle, it takes about 20 seconds for it to start leaking.
Caryc, good to see you have not given up yet. Have you considered replacing that valve assembly? It is basically just a spool valve with 3 0r four lands that allign with ports in the body of that valve. it is
a "open center" hydraulic circuit meaning that pressure from the power steering pump constantly flows through the spool lands and returns to the reservior when in a neutral position. the spool valve is
positioned by a concave type spring washer just below that retaining nut on the steering shaft.that spool moves when you initially turn the steering wheel and that spool only has a travel or stroke of about
.055 thousandths of an inch just a thought but if that spool valve or the bore that it rides in is worn or out of position some how maybe its allowing fluid the leak past those ports and lands.
a "open center" hydraulic circuit meaning that pressure from the power steering pump constantly flows through the spool lands and returns to the reservior when in a neutral position. the spool valve is
positioned by a concave type spring washer just below that retaining nut on the steering shaft.that spool moves when you initially turn the steering wheel and that spool only has a travel or stroke of about
.055 thousandths of an inch just a thought but if that spool valve or the bore that it rides in is worn or out of position some how maybe its allowing fluid the leak past those ports and lands.
The valve is available as a unit.
Should have asked... any change in the fluid your using in the PS?
I would be testing the various circuits with a 2000psi gauge setup for in-line testing.
The seal I used was rated for 50psi but the engineer said it goes a lot higher than that.
Hopefully the result of a test would be black and while such as a reading of 20 psi - means the seal is capable of holding the pressure.
OR
a reading of 500psi which would tell you that it is blowing past the seal and something is causing high pressure
A result of 75psi for me would be ambiguous.
All of the above is based on what have learned about dealing with our 202 steering. I have not yet had the need to run the test.
Should have asked... any change in the fluid your using in the PS?
I would be testing the various circuits with a 2000psi gauge setup for in-line testing.
The seal I used was rated for 50psi but the engineer said it goes a lot higher than that.
Hopefully the result of a test would be black and while such as a reading of 20 psi - means the seal is capable of holding the pressure.
OR
a reading of 500psi which would tell you that it is blowing past the seal and something is causing high pressure
A result of 75psi for me would be ambiguous.
All of the above is based on what have learned about dealing with our 202 steering. I have not yet had the need to run the test.
I have read that DEX III can cause issues. I am heading out so I don't have time to find the info. I suggest a search for MF power steering fluid. If I remember the MF Perm is recommended by MF. I am using the same hydraulic fluid as I use for the loader.
BIG DEAN did a short write up on it and power steering troubleshooting.
Take care,
Don
Ok, still trying to get an idea how this stuff works. In the top pic you see the valve. In the bottom pic you see the cover with the bowl shape that covers that valve.
During normal running, does that bowl fill up with oil covering the valve or is there a seal below that visible part of the valve that is leaking and letting oil into that area to leak out the top of the column?
ptfarmer
Well-known Member
- Location
- San Antonio, Tx
Since it's leaking at that seal you got a pressure leak into that area.
Fluid for Ferguson/early MF power steering units
By Dean Austin
Ferguson and early MF tractors used Type A automatic transmission fluid in power steering units.
MF issued a service bulletin when oil companies switched from Type “A” transmission fluid to Dextron.
The bulletin said not to use Dextron in Ferguson or early MF tractors since it was incompatible with the
seals that were used in the power steering units of these older tractors. MF said to use MF spec. M1129A
or M1127 transmission/hydraulic oil - the same oil used for the hydraulic system in the MF100 series
tractors. I have replaced a lot of seals in the older tractors because Dextron had been used in the power
steering system.
Any good universal transmission/hydraulic oil meeting these MF specs (M1129A or M1127) will work
(such as NAPA 85-401).
By Dean Austin
Ferguson and early MF tractors used Type A automatic transmission fluid in power steering units.
MF issued a service bulletin when oil companies switched from Type “A” transmission fluid to Dextron.
The bulletin said not to use Dextron in Ferguson or early MF tractors since it was incompatible with the
seals that were used in the power steering units of these older tractors. MF said to use MF spec. M1129A
or M1127 transmission/hydraulic oil - the same oil used for the hydraulic system in the MF100 series
tractors. I have replaced a lot of seals in the older tractors because Dextron had been used in the power
steering system.
Any good universal transmission/hydraulic oil meeting these MF specs (M1129A or M1127) will work
(such as NAPA 85-401).
Can you or one of you guys here explain what's involved in replacing the "valve" assembly if I should go that route? Is it all one piece? Do I have to order any other parts besides the valve?
Looking at the picture of the part in YT's parts here, it looks like that whole casting comes with it. Does the valve for the MF35 also fit the MF202? YT doesn't list a replacement for the 202.
My parts book for the 202 lists 1 752 888 M91
YT's parts for the 35 lists 101 8435M92 as replacing 1755047M91
ptfarmer
Well-known Member
- Location
- San Antonio, Tx
The 175288M91 part number I'm sure has been superseded a few times. I have never replaced one of those valves because no one wanted to pay for the labor, and the valve to do it. Plus the fact the power steering system had other problems.
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