Internal hydraulic pump MF40 Industrial

Jaypat88 · Mar 12, 2017

Hello, this is a pic of my Hydraulic pump in my MF 40
Industrial. Needed to replace the cracked Hydraulic cylinder.
A couple of questions:

How do I remove remove Hydraulic filter? Do I cut the wire to
the cap also?

It was suggested that I replace the relief valve but I can't seem
to find it on this pump.

I am also having trouble with this flat head bolt on the
response cover. Any suggestions to removing this?

Thank you and I appreciate all your help!

rockepg · Mar 12, 2017

Yes cut or untie that wire and the cap will screw off to get to the filter. You can remove that cotter pin to slide the coupler back and pull the shaft out for more clearance to work.

ptfarmer · Mar 12, 2017

With that screw put a screw driver in it, and give it a couple of hits with a hammer while trying to turn the screw driver.

Jaypat88 · Mar 12, 2017

What about the location of the relief valve?

Thank you!

rockepg · Mar 12, 2017

That cover is aluminum so don't wale on it! If ptfarmers suggestion doesn't work take a small punch and put in the slot on an angle towards the edge. Tap with small hammer and that should do the trick.

rockepg · Mar 12, 2017

No pressure control on that one so the relief valve should be screwed into the front of the pump. 883402M91 is the part number.

Dieseltech · Mar 12, 2017

Looks like the lift cover was pulled before the pump roller was taken out..

Jaypat88 · Mar 12, 2017

Is there access to the relief valve or do I need to pull the pump
out in order to replace relief valve?

Thank you

Jaypat88 · Mar 12, 2017

Unfortunately yes. Thankful I found the roller.

Jaypat88 · Mar 12, 2017

So after looking at a picture of the hydraulic pump online, it
looks like the previous owner put a bolt where the relief valve
should go. Could this be the reason the hydraulic cylinder
was cracked?

rockepg · Mar 13, 2017

That picture you have there with the vertical relief valve is an aftermakert unit "option". The only factory pumps that had vertical also had pressure control. That bolt you are referring to is where the pressure control unit would attach. Right next to that on the back side there might be a plug though. Hard to tell from your pic but here is where the valve should go. Item 76 and 77..

Jaypat88 · Mar 14, 2017

Can't seem to find a plug or valve. Is it possible my pump
does not have one?

rockepg · Mar 14, 2017

Anything is possible i guess. Is your tractor a 40B by chance? The parts book does show one pump with very certain serial numbers that used a pump with no pressure control or relief valve. Why i have no idea but it apparently existed.
If you take that plug off the top there is the chamber inside connected to the hole for the stand pipe? If so then maybe someone put in an aftermarket pump and removed the valve for some reason..

Jaypat88 · Mar 21, 2017

I am not sure if it is a 40B or not. How would I know? Serial is 9A148523.

ptfarmer · Mar 21, 2017

The 40 has the 3.152 Perkins, the 40B has the 4.203 Perkins. With the 9A148523 serial number looks like you have a 1972 MF40.

MF40 Disc Brakes
Years Built 1969 - 1975
Engine
AD3-152 Diesel
AG3-152 Gas
Horse power 42
Transmissions
Manual shuttle
Instant Reverse
Serial Numbers (depends on which plant it was built).
Year Starting NO.
1969--836912--9A 63158
1970--838138--9A 87325
1971--839413--9A 107519
1972--840280--9A 128141
1973--641073--9A 152025
1974--841787--9A 182761
1975-842272--9A 207681

MF40B Wet Disc Brakes
Years Built 1976 - 1982
Engine
AD4-203 Perkins
Fuel Diesel
Horse Power 53
Transmission
8 speed 8F / 2R
Manual Shuttle
Instant Reverse
Serial Numbers
Year Starting No.
1976 9A 250640
1977 9A257837
1978 9A 280301
1979 9A300200
1980 9A 326169
1981 9A 339334
1982 9A 350584

rockepg · Mar 21, 2017

Ok then a standard 40 should very much have a relief valve. Pull that plug you have circled and see if it connects to the stand pipe hole. If it does it would be a safe bet someone put in aftermarket pump and removed the valve for some reason. Maybe the original one had pressure control and it was removed?

JBKINWA · Mar 23, 2017

I know this post is a couple of weeks old, however I am currently fixing some of the same issues with my MF40. You have a Mark II pump, and should have had a pressure control valve mounted on top of the rear body or a block with a cartridge style control valve. What shape is the support bracket mounted to the side of the hydraulic lift cylinder? It matters as to the way pressure was adjusted or maintained. The pressure control or safety valve was eliminated and lead to the cracked cylinder. All of the available MF40 Service manuals I have seen are 1st editions and do not have the last revisions pertaining to Lift cylinders and hitch covers in them. You cannot get them from AGCO and unless you know someone who has the dealer version with all the revisions, like me you will have to punt. If you are still having issues with the pump let me know, I have figured out most options.

Internal hydraulic pump MF40 Industrial

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