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FEL being raised or lowered has little affect on hyd oil level in reservoir especially not to the extent of hyd oil pouring out of hyd oil dipstick hole when FEL is lowered. Over filling hyd reservoir can lead to heating of hyd oil. My guess is dealer over-filled trans reservoir hoping to...

Be sure all rear wheel & rear weights if applicable retaining bolts/nuts are tight.

Welcome to this forum Sounds as if head gasket &/or cylinder head is faulty. One could test radiator operating pressure with a gauge. Remove cylinder head & have it magnafluxed checking for cracks & have machine shop check it to be sure it's level. Have you got engine above normal operating...

Congratulations on your repair & thanks for updating your thread.

Have you checked/cleaned/tightened all 4 battery cable connections??

It appears from viewing parts catalog that the hyd shuttle is electronically controlled. I counted 5 electrical switches on that tractors clutch housing & there could be more switches I didn't locate. I suggest after checking to be sure hyd oil is at the full mark then checking for a blown fuse...

Is fuel tank venting? I once owned a M4900 that acted similar to your M120. Local Kubota service manager advised me to check for restriction in water separator gallies. I remove fuel control valve from water separator housing & I located a tiny screen that was clogged. Cleaned the screen...

Check for good fuel flow from tank to inj pump. Is fuel tank venting IE try operating engine with fuel cap removed & shop towel covering fuel tank neck.

10,000 hrs is a lot of hours of use but I've read of some tractors going well over 20,000 hrs of use. I never read anything negative concerning Kubota hyd shuttle & I think the shuttle is durable. I own a '11 M7040 with 1900 hrs on speed/hr meter that the hyd shuttle has handled several 1000's...

I agree with NIW that water must be entering fuel tank from the outside of tank. Is this tractor stored inside or outside? I suggest to install some fuel conditioner that contains a Biocide to control fungus growth in fuel tank. Several yrs ago my neighbors M8560 had water in fuel tank then...

Welcome to this forum Check to be sure fuel tank is venting IE try operating engine with a shop towel covering fuel tank neck.

That statement is true on modern diesel powered engines but about 70 years ago IHC built several farm tractor engines that were started on gasoline & then switched over to operate on diesel. These engine cylinder heads had sparkplugs on 1 side & diesel injectors on other side of cylinder head. A...

Filling fuel tank to full mark will help in bleeding air from fuel inj system due to affect of gravity attempting to push fuel out of tank outlet.

How many hrs of use since hyd filters were changed? Have you checked hyd oil level recently?

Ford 6700 tractor that I owned could have had that type valve but I never looked for it due to my 6700 have a cab obscuring sight of the valve body & the fact the single acting cylinders lowered rake wheels with no problems.

I operated one way cylinders on my H&S hi-cap rake on a Ford 6700 for over 15 yrs with no hyd tank return that gave no hyd problems. That set-up raked several 1000's of acres. I also operated one way cylinder on disc cutter on a Kubota M7040 with hyd hyd oil tank return with no known hyd...

IMHO adding/collecting taxes without sending tax $$$$ to correct government entity is not legal.

I suggest to cut/grind poor appearing welding & allow shear bolt to protect mower & tractor driveline as designed by Bush Hog engineers.

Welcome to this forum I suggest since you looked at all fuses to check for a faulty relay. Drive by wire systems are great until they fail. I'm glad my M7040 reverser is controlled by a shift cable.

I suggest to check hyd pressure which I'll guess should be a little over 2000 psi