Mf202 backhoe and hydraulic help

[Eazycheeze]

Hey guys as I posted before was too get my mf202 up to par in its life and now it has. Runs smooth and operates good. This week I picked up a Montana mbh76 3 point attached.

I have a three spool valve on top of transmission on the plate and 1 controls the 3pth are high in turn I guess doesn t allow me too use my draft controls anymore. The other two are for auxiliary connections aka my plow up/down and tilt in/out. They work great and they are two way cylinders on the plow.

For the backhoe there was two quick connect connections back of tractor which one split off the out from pump ( I tested with lever held in the up position and fluid squirted out and I also disconnected the quick connect from plow so it gets no pressure). The other connector at back nothing comes out so I assume it s return port. However the return port goes into a selector valve ( as in picture) and from there it goes onto the spool valve assuming it goes back into pump.

I have two questions as I m unfamiliar with hydraulics.

1: the selector valve, if pushed in, allows fluid from hose closest too spool too flow into Center hose back to spool( this is from rear aux connection.)

If pulled out it allows fluid too return from tilt cylinders too spool, is this how they work?

2: when I hook my backhoe up and attempt too use it with what I think is the in and out port ( on backhoe it tells me which hose is from pump and other is too sump, Just on tractor I am not sure how the flow works. ) the outriggers go down but can t go up, and nothing else works it jerks and moves maybe 1/2" and then the tractor starts squealing or hissing so I quickly pull the spool lever back to Center. Is my connections reversed or is this setup not setup for a backhoe. I m just unsure if the return is functioning as riggers go down so it gets pressure but something isn t returning. And when this happens fluid starts coming from somewhere in backhoe valve back, hopefully fluid is just being pushed by seals and didn t blow them.

Now if I m correct about the diverter, I have it pushed in as too allow the hose closest too spool bank on diverter too flow through Center and back to spool bank. The return on spool bank goes into the second spool lever section and not the first lever section if it matters.

Any help is appreciated thanks guys here s pictures

Colours and functions :

Red: too up/down cylinder on plow , also split off too go to rear aux quick connect. ( with lever pulled up this has fluid flow)

Pink: this is the other rear aux quick connect at rear which is on the diverter

White: this is the hose returning or going to tilt cylinders which is connected as well to diverter bank

Blue: hose from diverter too spool bank ( either this hose is the return or feed for tilt and rear)

Green: this hose comes from plow up/down

Yellow: goes too or from plow tilt cylinders.

Purple lever: this is plow up and down, which is also being split too be used for rear hydraulics, has flow out the quick coupler in rear when held up.

Black lever: plow tilt, not being split but return is from diverter unless I m understand flow wrong then it s opposite of what I said

Orange lever : that s 3 point hitch control

 

[PatrickS2222]

Hi, I'm zero help with your hydraulics questions, but if I can I'd like to offer a bit of advice on another point about the mounting of your backhoe.
The top mount as shown in your first pic is attached to the usual top link attaching point on the tractor. It needs to be relocated to the triple-holed mounts on the rear casing immediately below it. This is because the top link mount has a force-sensing mechanism built into it which won't tolerate the forces a backhoe will throw at it. MF design their implements which don't utilise the draft-sensing function in the tractor to attach directly to the casing - implements and attachments such as bush hogs, mowers, lifting poles etc.
Your 3PL hydraulics will probably not lift at all if this valve is damaged. This may require a modification to the top link of the backhoe, but it is certainly necessary in the interests of attaching it the way MF engineers intended, and recognised the need for this alternative mounting location.
Also just thought of the addition of swaybars to the lower links. Two, as used with most agricultural implements, to limit the side-to-side movement of whatever is attached to the 3PL. They reach up under the rear axles to mounts - which may not be fitted to an industrial tractor - outboard of the lower link mounts. My 203 didn't have them - I fitted a pair.
Note: Don't use chains - bars work in both directions and help each other - whereas chains don't, only one is effective at a time, putting all the force on one side.
I have a 203 with FEL, love it and what it can do. We also have a 135 - from my boyhood. Look after yours - it's also a great machine!

 

[Eazycheeze]

Hi, I'm zero help with your hydraulics questions, but if I can I'd like to offer a bit of advice on another point about the mounting of your backhoe.
The top mount as shown in your first pic is attached to the usual top link attaching point on the tractor. It needs to be relocated to the triple-holed mounts on the rear casing immediately below it. This is because the top link mount has a force-sensing mechanism built into it which won't tolerate the forces a backhoe will throw at it. MF design their implements which don't utilise the draft-sensing function in the tractor to attach directly to the casing - implements and attachments such as bush hogs, mowers, lifting poles etc.
Your 3PL hydraulics will probably not lift at all if this valve is damaged. This may require a modification to the top link of the backhoe, but it is certainly necessary in the interests of attaching it the way MF engineers intended, and recognised the need for this alternative mounting location.
Also just thought of the addition of swaybars to the lower links. Two, as used with most agricultural implements, to limit the side-to-side movement of whatever is attached to the 3PL. They reach up under the rear axles to mounts - which may not be fitted to an industrial tractor - outboard of the lower link mounts. My 203 didn't have them - I fitted a pair.
Note: Don't use chains - bars work in both directions and help each other - whereas chains don't, only one is effective at a time, putting all the force on one side.
I have a 203 with FEL, love it and what it can do. We also have a 135 - from my boyhood. Look after yours - it's also a great machine!

Hi thank you for the reply. I managed to figure most of it out, I’m stuck at if the backhoe can be used with a double acting spool for the return or is it better to plumb directly to sump and use a single act spool?

Also good too know, any idea where to get a bracket for the triple hole mount or is it a custom job? I seen that and wondered, that clarifies things, rather use that for sure, thank you

 

[PatrickS2222]

Hi, I'm only guessing, but from the little I know about hydraulics I feel the backhoe needs a good supply from the pump, and a free return - best return I can imagine will be to the sump, via a good-sized fitting in the PTO lever mounting plate seems the best option for other purposes such as tipping trailers etc. You might find the hoe a little slow because these pumps don't have much flow capacity, although it will be strong because they do give quite good pressure. Patience will help get the job done.
As for a triple-mount, MF attached anything else to that - only plowing-related equipment went to the top link mount. You might need to make, or have made, a custom link to suit this application. Don't overlook the fact that the hoe will still try to move sideways as well as vertically to some degree, so the mount will need to accommodate this, or it will break something. You may like to use something that will incorporate two or all four of the 3/8" studs around the PTO - where the check-chain brackets currently attach. This will help further spread the forces over more points. The ideal set-up is obviously a frame-mount hoe, but 3PL mounted units fortunately tend to be a bit smaller. This is an asset because 3PL mounts were never intended to absorb forces such as from these units.
Remember, if it's done properly, it needs doing only once. Also, your tractor will handle this work well, and will live to work another day. Her bigger sisters had reinforcing frames to distribute these forces all over the whole tractor - that's how they are still working 60 years later!
Good luck!