Kubota M6800 fuel bleeder cock

[MarkAM]

There is a 1/4” tube coming off the back side of this bleeder valve on the fuel system. Mine has a pinhole in it spraying fuel all over the engine. I checked the valve and it was rotated all the way to the left, which I think would be the “open” position so I turned it all the way to the right to what I think should be the “closed” position but it still sprays fuel out the pinhole in the tube. I have two questions if anyone knows and can advise me I would appreciate it.

1. Shouldn’t this cock normally be in the closed position and only opened when bleeding air is necessary or is it ok to leave open all the time because it apparently dumps back into the fuel system somehow???

2. Is the valve gone bad since it still lets fuel through the 1/4” hose in the closed position?

 

[Harry in Ky]

I'd say that the bleed valve is probably working as it should. The leak is coming from fuel in the line and coming from somewhere other than the bleeder. To confirm that slip the hose off the bleeder and start the engine. I think the fuel will exit the hose not the bleeder. Can you just shorten the hose and cut off the part with the pinhole? Or just replace it.

 

[5030]

Kubota's all use the hose attached to the bleeder valve to return excess fuel from the injectors to the fuel supply (like most all diesel engine's do). There will be a Tee fitting up higher on the side of the motor somewhere that allows excess fuel from the injectors to access that hose. I'd just replace the hose with the pinhole with a new hose (your friendly auto parts store will have the fuel line) and the valve should always remain closed unless you are evacuating air from the fuel system, righty, tighty. Curious as to how it got a pinhole in it as I've never had that issue on either of my Kubota's.

 

[MarkAM]

I'd say that the bleed valve is probably working as it should. The leak is coming from fuel in the line and coming from somewhere other than the bleeder. To confirm that slip the hose off the bleeder and start the engine. I think the fuel will exit the hose not the bleeder. Can you just shorten the hose and cut off the part with the pinhole? Or just replace it.

You were correct Harry! The valve is still working correctly. I guess there is back pressure pushing fuel out. $1.10 for some hose and it’s good to go! Thanks for the response again!

Mark

 

[MarkAM]

Kubota's all use the hose attached to the bleeder valve to return excess fuel from the injectors to the fuel supply (like most all diesel engine's do). There will be a Tee fitting up higher on the side of the motor somewhere that allows excess fuel from the injectors to access that hose. I'd just replace the hose with the pinhole with a new hose (your friendly auto parts store will have the fuel line) and the valve should always remain closed unless you are evacuating air from the fuel system, righty, tighty. Curious as to how it got a pinhole in it as I've never had that issue on either of my Kubota's.

I don’t have a clue how it got the pinhole in it but it wasn’t there last fall when I finished up hay season and fired it up yesterday to make my first hay cutting of the year and after one round I noticed something dripping off the frame on the right side of engine and climbed off to have a look and it was spraying away. $1.10 section of fuel hose from Oreileys and it is fixed now. The bleeder cock was fine too, I just didn’t think it would have fuel pressure on it with the cock closed but I guess it is supposed to. Thanks for the response! It’s great to have knowledge tractor guys to toss ideas off of!

Mark

 

[5030]

Hopefully, small squares as your tractor really don't have the balls to run a big round bailer. Mine do but loaded with a full bale and getting on a decline can be interesting. I have a new Kubota BV Sileage special bailer.

 

[MarkAM]

Hopefully, small squares as your tractor really don't have the balls to run a big round bailer. Mine do but loaded with a full bale and getting on a decline can be interesting. I have a new Kubota BV Sileage special bailer.

No actually it’s rated at 62 hp on the pto which is ample power for my 504L series baler. It has a minimum requirement of 45 hp and a recommended 55 hp but I don’t put up silage, just dry hay.

 

[5030]

No actually it’s rated at 62 hp on the pto which is ample power for my 504L series baler. It has a minimum requirement of 45 hp and a recommended 55 hp but I don’t put up silage, just dry hay.

Have no idea what a 504L series bailer is. It's really not the input power but the combined weight of a loaded round baler (full bale and bailer weight) on inclined slopes. I have a 'sileage special' bailer but I don't bale sileage either, just dry hay and the only reason why I have one is Kubota had to refit mine with the sileage scrapers (on their dime) in order for the drive rolls to strip off the accumulated hay and not foul the drive rollers. Like I said on their dime, not mine. I also got a 'sileage special' sticker on the bailer side...lol

 

[Sportsman762]

A kubota M6800 2wd open station is 4,475 lbs dry with no options, and a M9000 2wd open station is 5,093 lbs dry. A M9000 4wd cabbed is 6,200 dry with no options. The m9000 is light for round baling, as is a M6800, however it can be done with a light tractor as @5030 has shown, Not sure if 600 lbs is going to make much difference. The M9000 is one of the lightest weight 80-90 hp tractors out there. The reduced weight equates to reduced compaction making them a great hay tractor.

 

[5030]

Mine are a bit heavier than that actually as both have cast rear centers and they both have loaders on them that stay on all the time.