More... not right at the start when I first come to it but not long after cranking when bleeding.
B7500 start problem
- Thread starter LawEd
- Start date
Russell King
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Lifetime Member
Equipment
L185F, Modern Ag Competitor 4’ shredder, Rhino tiller, rear dirt scoop
As stated by @North Idaho Wolfman the black smoke indicates over fueling. I would do something with the injectors at this point I guess…
1) inspect the spray pattern
2) have injectors tested and rebuilt
3) replace injectors with new OEM injectors
Hopefully you can wait on more experienced advice and see if there is any consensus. I just don’t see how they would just fail in a sudden manner.
Since you were using it in a firefighting mode can you recall anything that could have harmed the engine other than running low on fuel? Was it thick smoke being sucked into the engine? What did the air filter look like when replaced? Was there anything in the smoke that could have effected the combustion chamber?
I am guessing something may be damaged but I believe your tractor is old enough to be purely mechanical on the fuel injection system so can’t really see how the fire would damage the injection system.
Did you cut open the fuel filter(s) to see if there was anything that was suspicious inside?
1) inspect the spray pattern
2) have injectors tested and rebuilt
3) replace injectors with new OEM injectors
Hopefully you can wait on more experienced advice and see if there is any consensus. I just don’t see how they would just fail in a sudden manner.
Since you were using it in a firefighting mode can you recall anything that could have harmed the engine other than running low on fuel? Was it thick smoke being sucked into the engine? What did the air filter look like when replaced? Was there anything in the smoke that could have effected the combustion chamber?
I am guessing something may be damaged but I believe your tractor is old enough to be purely mechanical on the fuel injection system so can’t really see how the fire would damage the injection system.
Did you cut open the fuel filter(s) to see if there was anything that was suspicious inside?
Thanks Russell. Yes, tractor front was in high heat with lots of thick smoke with wind. Tractor was sucking dirty air into engine intake and fuel tank cap. The outer air filter was dirty, inner air filter was clean. I will look for fuel filter, hopefully it is still in my garbage, but it was dirty. Fire was from dry, tall, wild grass so it was a normal fire i.e. no chemicals. Bucket and front tires took a beating, but remainder of tractor seems fine. Front grille is plastic, looks good, no melted spots, and no deforming. Not very much wiring in this tractor but wiring around engine and starter is Ok. No sign of melting anywhere. Bucket hydraulic hoses are fine. The thought crossed my mind that one or two injectors could have crap inside them.
Russell King
Well-known member
Lifetime Member
Equipment
L185F, Modern Ag Competitor 4’ shredder, Rhino tiller, rear dirt scoop
Well one other thought on it is maybe it overheated? I don’t know why that would keep it from starting now or why it continued to run until parked though.
I would look in the front of the radiator at a screen and make sure it is not melted (it is plastic on my tractor). If not melted I would clean it and the exterior fins of the radiator just to be safe.
I would look in the front of the radiator at a screen and make sure it is not melted (it is plastic on my tractor). If not melted I would clean it and the exterior fins of the radiator just to be safe.
Thanks Russell... My tractor must be old style because the screen in front of the rad is ridgid metal with metal framing. There will have to be a comprehensive maintenance done on the cooling system, hydraulic oil front and back, repaint on bucket and bucket rams, etc. This tractor has always run cold. I don't think it overheated. It definitely didn't boil over.
BAP
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2012 Kubota 2920, 60MMM, FEL, BH65 48" Bush Hog, 60"Backblade, B2782B Snowblower
Follow Russell’s advice on checking the injectors. My Dad had a B7500 and at one point, 1 injector crapped out and the tractor would not start.
Russell King
Well-known member
Lifetime Member
Equipment
L185F, Modern Ag Competitor 4’ shredder, Rhino tiller, rear dirt scoop
Just to let you know that there are some sealing washers under the injectors that you could replace also. They are copper I believe so may be hard now and not seal well. You can anneal the old ones if you want, I just tend to replace since they are normally inexpensive.