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My guess from viewing M108X parts catalog is that engine speed(rpm's) is electronically controlled because I located no mechanical governor in PC

Do any fault codes appear on instrument panel? I'll guess common-rail electrical problem.

Sounds as if hyd valve that's controlled by foot pedal isn't opening fully therefore keeping pressure applied to shuttle clutch plates

Check to be sure ALL wheel mounting bolts are tight.

Many yrs ago I owned a M4900 that had fuel supply problems. Local Kubota service manager advised me to check to determine if tiny screen in fuel shut-off valve in water separator was clogged. I found screen clogged. I cleaned screen & engine began operating correctly.

I think I'd replace springs with new springs when replacing new linings

But he can be easily found on Tractorbynet

Does your M5-111 have hyd reverser? If so clutch pedal controls a hyd valve. It's my WAG that hyd reverser is the component that is failing. I would think hyd shuttle would be located in clutch housing or very front of transmission case. Hyd shuttle clutch assembly is $2385 from Messicks so if...

Many yrs ago I owned a M4900 that engine operated similar to what you describe. I finally located a tiny screen on fuel shut-off valve in water separator housing that was clogged. Cleaned screen & then engine operated fine

Yrs ago I added an adjustable flow control valve to boom circuit on loader on my Kubota M4900. The flow control valve eased operation while handling 4X5+ rd bales that weighed 900-1000#s

Back yard or front yard repair I've had cornhead grease in my JD 709 rotary mower that has a faulty blade shaft seal for several years. While operating cutter cornhead greases liquifies some & when machine sits it solidifies. Cornhead grease has been used for over 40 yrs so it has it's value.

It appears that Dave has your question answered about brake pedal switch.

My "crystal ball" is cloudy it would help if you would reveal your tractors model so you could receive correct part # for your tractors brake light switch.

I agree with other posters never add refrigerants without monitoring both high & low pressures with gauges.

As we're well aware of incorrect information especially if posted on the internet isn't a good thing!!

A couple of years back my neighbor's M8560 that got water in fuel tank then the water grew a fungus. Kubota dealer replaced common rail pump & injectors. Common rail fuel system isn't as forgiving to foreign things in fuel system as older technology fuel systems.

I suggest to raise 1 rear tire with a jack or your M7040. This should loosen stress on drivetrain.

I suggest to check to be sure fuel tank is venting. An unobstructed tank vent keeps exiting fuel from creating a vacuum in fuel tank stopping fuel flow. Did you replace water separator housing? If not I suggest to check for fuel flow blockage in water separator fuel passageways. Several yrs...

I'm curious why you elect to pull a heavy load such as a subsoiler(2 1/2') at a ""crack above idle"'? I guess you don't realize lugging a diesel powered engine is very detrimental to the engines longevity.

Welcome to forum Ditto on not enough fuel anti-gel or it's possible fuel tank vent is clogged.