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Adding down pressure MF 90 loader

N

nisse

Member
I recently purchased a Massey Ferguson 65 with a MF 90 loader, the boom of the loader has single acting cylinders and the bucket has 1 double acting cylinder, it is driven by a front mounted pump. I would like to add down pressure to the bucket, besides double acting cylinders and some hoses what would I need to do to the valves? Where is a good source for cylinders?
Also does anyone know the lifting capacity of this loader?
Finally I am going to purchase a manual for the tractor and was looking at the ones sold by yesterday's tractors, are these a good manual?
I hopefully added some pics of the lift cylinders and valves.
Thanks,
John
a161014.jpg

a161016.jpg

a161017.jpg
 
Surplus center is a good place to buy cylinders but you need to measure the cylinders you have and get ones that are the same both closed and extended. You will also be likely to need to replace the valve body and get one that has to sets of valves for double acting cylinders. As for how much will it lift well a whole lot more then the tractor it self can handle. You will find you want to always have something heavy on the 3 point or you will find that you have a major traction problem
 
Thanks for the reply, as far as the valve I was hoping it would be possible to T off the port that is plugged now? The other T is what is going to the lift cylinders now, is there a way to test or know if that will work? Take plug out and see what happens?
Thanks,
John
 
some spools can be converted to either single or double acting cylinders. you would need to find the mfr of your valve and go from there. i agree with old, get a new spool valve from surplus center and call it a day. also, i would get a spool valve with one that has a float position for the loader. real handy for back dragging to level ground. it allows the loader to float over the ground instead of a fixed position.
 
I don't think you can just take the plug out of the valve and use that port.

When you push the lever to the down position, does the pump load? Probably not. If the pump is not loading against the plugged port, it won't make pressure for the cylinders. Like old said, you will need a different valve. Be sure it is "open center".

Also, when selecting the cylinders, you will likely have to go somewhat larger on the bore to keep the rod diameter substantial for the application. Be aware, the larger the bore, the slower the arms will lift. They will make more power, but be slower. So if that is a concern, try to get the smallest bore and still keep the same rod diameter.
 
That Tee is just splitting the flow to the two lift cylinders. It is a posability that if you remove the other hex plug and plumb it with a Tee and hoses to the down pressure side of your new cylinders, things will work for you. We don't know the characteristics of your current valve.
You need to test the valve with a pressure gauge and see if the caped port has pressure when the lever is moved in the other direction.
Loren
 
Thanks for the help, the pump does not load when the load cylinders drop so I'm thinking I will need a different valve, but will test with gage to be sure.
Thanks,
John
 
What is the hose hooked to the elbo on the side of the valve? Is it an inlet or outlet? Or is it a dump line? Many times when a port is plugged like that there is a dump line so the valve doesn't load the relief when lowering the loader. If that line is neither an inlet or outlet, then is is a dump, so then you would take the plug out of the port and put it in the dump port.
 
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