M7060 bogging down.

[BufordBoone]

Additional. The engine runs fine and doesn't seem "starved" for fuel, except when I put a load on it. In other words, when the issue happens, simply disengaging the PTO and it the engine doesn't bog down. Then, pulling on one of the hydraulic remotes bogs it down.

Strange but, thanks, again, for all the advice.

 

[5030]

Time to trundle down to HF and buy a 35 dollar non contact IR thermometer.

 

[Jerry/MT]

Additional. The engine runs fine and doesn't seem "starved" for fuel, except when I put a load on it. In other words, when the issue happens, simply disengaging the PTO and it the engine doesn't bog down. Then, pulling on one of the hydraulic remotes bogs it down.

Strange but, thanks, again, for all the advice.

You do realize that when you run the engine without load and it runs fine, you are using a minimum amount of fuel. When you add load, the fuel flow has to increase to hold almost constant rpm with load. So your fuel delivery system may be able to deliver enough fuel at no load idle but cannot provide enough fuel to the injector pump to run under load.

 

[BufordBoone]

You do realize that when you run the engine without load and it runs fine, you are using a minimum amount of fuel. When you add load, the fuel flow has to increase to hold almost constant rpm with load. So your fuel delivery system may be able to deliver enough fuel at no load idle but cannot provide enough fuel to the injector pump to run under load.

Well, NOW I do realize that. Should have been obvious. Thanks.

 

[Like Tractors]

I'm experiencing a bit of an M7060 (2018 model) Issue when bush hogging.

I Set PTO speed to 540. Once I begin cutting it will usually drop to about 525-530. Fluctuates mildly while cutting, depending on up or down hill, etc.

Will run well for about 1.5 - 1.75 hours. Then it will begin to bog down. Changing to lower gear will bring PTO speed back up. Then it will bog again. Eventually, It will have to be in 2nd or 1st gear to keep PTO speed up, even in sparse grass.

Once it gets in this state, engaging one of the rear hydraulics (lift rear or wings of mower) will also bog the engine down dramatically.

When first starting up today, I verified that engaging one of the rear hydraulics does not bog engine down while functioning normally.

It has done this with both a 12’ wing mower and the 10’ offset mower. I hooked the wing mower to our L5740 and it cut the same area without difficulty.

Both tractors use fuel from the same transfer tank.

It has been doing this for about a week. I park it overnight and it seems to be fine the next day, for 90 minutes or so. Then, same symptoms.

Things I’ve tried:

Throughly cleaned all radiators
Changed both inner and outer air filter.
Drained the water separator.
Verified sufficient hydraulic fluid.

A friend has a neighbor that used to be a tractor mechanic. He explained the symptoms to the neighbor who said "It sounds like a sensor that may have gone bad. Whatever it is is something trying to protect the system".

Has anyone out there experienced anything similar? Any ideas before I have it taken in to the dealer?

Thanks.

I have been through a low power problem with an M7060 after 1-2 hours of use that required most of the engine horse power. I suggest you measure fuel pressure at the fuel filter inlet while running under load. As long as you have proven that you don't have a fuel restriction before the electric fuel pump, you have a serious problem on your hands. Contact me for details.

 

[RickB]

I’m gonna refer you back to post #8. Read it again. I see you have run the cutter with a different tractor to eliminate it as your cause .

 

[Hay Dude]

Fuel filters.
A month ago I was baling a field an noticed when the plunger was about to hit (big power drain), my MX270 would bog down. It idled and ran normally with no load. Knew it was FF’s. Changed primary and secondary fuel filters. After a few minutes of air getting bled, it ran like a champ.
Just remember after you change them it could take a few minutes to run smooth again.
If that doesn’t do it, listen to RickB. I agree with his thoughts and he knows what he’s talking about.

 

[tmajor]

I'm experiencing a bit of an M7060 (2018 model) Issue when bush hogging.

I Set PTO speed to 540. Once I begin cutting it will usually drop to about 525-530. Fluctuates mildly while cutting, depending on up or down hill, etc.

Will run well for about 1.5 - 1.75 hours. Then it will begin to bog down. Changing to lower gear will bring PTO speed back up. Then it will bog again. Eventually, It will have to be in 2nd or 1st gear to keep PTO speed up, even in sparse grass.

Once it gets in this state, engaging one of the rear hydraulics (lift rear or wings of mower) will also bog the engine down dramatically.

When first starting up today, I verified that engaging one of the rear hydraulics does not bog engine down while functioning normally.

It has done this with both a 12’ wing mower and the 10’ offset mower. I hooked the wing mower to our L5740 and it cut the same area without difficulty.

Both tractors use fuel from the same transfer tank.

It has been doing this for about a week. I park it overnight and it seems to be fine the next day, for 90 minutes or so. Then, same symptoms.

Things I’ve tried:

Throughly cleaned all radiators
Changed both inner and outer air filter.
Drained the water separator.
Verified sufficient hydraulic fluid.

A friend has a neighbor that used to be a tractor mechanic. He explained the symptoms to the neighbor who said "It sounds like a sensor that may have gone bad. Whatever it is is something trying to protect the system".

Has anyone out there experienced anything similar? Any ideas before I have it taken in to the dealer?

Thanks.

Just had a similar sounding problem. ... New fuel filter cured it.

 

[IFixTractors]

Number one issue with this is always new fuel filter and clean/check the water separator. Second, Kubota has a bulletin for replacement fuel injectors for the V3307 engines in a certain engine serial number range. This is considered a warranty and emissions part, so they have some extension to the base warranty on this particular part. Please make contact with your local dealer to see if your machine is affected by this bulletin.
The V3307 engine is used in several different Kubota machines. M6060 and M7060, SVL75-2, M4, and KX080-4, among others.

 

[IFixTractors]

PSB-2021-007-E-R1​

Is the bulletin number.

Issue:
There is a possibility that engine power may drop at operating temperature. The nozzle body may not open/close due to an internal failure of the injector. (Other than contamination in fuel)

This is covered for 5 years from date of original purchase, no hour limit.

Many people have complained about low power issues, and now it is a known issue. Had one customer that went so far that he bought another brand because the power was low, never got the Kubota service reps involved (dealer didn't help), just complained about the issue. The rep took a 5 min look at it, yep, bad injectors, and had the dealer install new. Power is fine, customer was now upset at the dealer (of course) and at himself for buying another machine. He liked his Kubota other than that low power issue.

Hope this helps.