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When you state "removed cable" I presume you're referring to your mechanical shuttle not shifting.? If that's correct many yrs ago I had a similar situation with a M4900DT only it was stuck in reverse. I had to have manual shuttle assembly replaced.

Rockshaft piston housings normally have a thermal relief valve installed to keep that catastrophe from happening. I advise to check for presence & correct operation of TRV. I also was taught many years ago to lower all hyd attachments when not using or storing tractor.

I have a JD 3 disk breaking plow. I used it last summer to plow firebreaks around my outside stored rd bales. I think that Tufline disk plow would plow just fine. Back in my youth I spent many hours driving a tractor pulling a 4 disk drawn breaking plow.

I recommend installing manual heater hose cut-off valve & adding some refrigerant while monitoring high side pressure gauge .

Many yrs ago just for kicks I baled some hay with my '45 JD BO(14 HP) pulling a JD 214 sq baler

1700#s should help 3 pt lower. Sounds as if 3pt control valve has failed.

How much weight or load is attached to 3pt hitch?

Many yrs ago I had a fuel problem on a M4900. I checked for good fuel flow from tank to water separator which was good but fuel level in water separator would fill up. Local Kubota dealer service manager advised me to check for blockage in WS housing & especially check for a clogged screen. I...

ORC was designed to allow a high speed implement such as rotary mower to not back feed through tractor pto/trans causing tractor forward speed to continue when clutch pedal is depressed on tractor with transmission driven pto. IMHO when pto is turn off after operation tiller tines will stop...

Yes cable controlled FEL valve on both M4900 & M7040. Also both tractors had cabs.

Amen buddy I traded my Kubota M4900 with very sensitive FEL controls for a M7040 & IMHO the FEL control valve is much more user friendly. I can lower a rd bale with ease without the need for an extra flow control valve to limit speed of boom lowering

Many yrs ago when I owned a M4900 & handled 1000# rd bales with the front end loader when attempting to lower the boom while supporting a rd bale the boom would drop too fast. I installed an adjustable flow control valve in boom hyd circuit dialed in to my satisfaction. Problem was solved.

Fuel starvation sounds similar to a M4900 that I owned many yrs ago. Local Kubota dealer service manager advised me to check for a clogged screen in galley in fuel water separator housing. I located the tiny clogged screen & cleaned it. Fuel problem solved. YMMV.

DITTO IMHO North Idaho Wolfman is this website's Kubota Guru.

Check for good clean/tight connection of negative battery cable to tractor frame.

Ditto on poor battery cable or bad battery cable connection.

Both manual & hyd controlled shuttle(reverser) have control lever on LH side of steering wheel. If manual controlled shuttle does traction clutch foot pedal have free travel?

I suggest to check reverser fwd clutch pressure. Also check reverser linkage to be sure it's fully shifting control valve. If your M9000 drivetrain system is similar to my M7040 the dry damper clutch remains engaged 100% of the time & if it slipped I think there would be low or no hyd pressure...

My Kubota tractor isn't on your list. My Kubota tractor is a '11 M7040

I suggest to check/clean/tighten all 4 battery cable connections