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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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
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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
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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.
So I received new OEM injectors. Took off the injector fuel overflow pipe, pipe is plugged between center or middle #2 injector and number #3 injector (closest to rad). Openings in overflow collars are extremely small, no way any kind of wire will fit into it. Will try compressed air but no way of knowing if piping will be clean completely so there are no future injector plug ups. Can not order new overflow pipe until Tuesday because of Labor Day holiday.
One other note. Is there any reason that a person should not separate the collars leave some piping stubs attached to the collars, discard the hard pipe between the collars and use hose and clamps between the collars? Both ends of the overflow pipe header are hose anyway - one back into the injection pump and one back to the fuel tank.
Russell King
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Equipment
L185F, Modern Ag Competitor 4’ shredder, Rhino tiller, rear dirt scoop
On my L185 there are rubber hoses used for all the over flow between #1 and #2 and the tank. The clamps are pretty simple spring wire clamps so not able to hold too much pressure.
Could you post pictures of what you have going on? I would like to see what is going on out of curiosity.
Your illustration looks similar to what my tractor looks like except more complex.
Could you post pictures of what you have going on? I would like to see what is going on out of curiosity.
Your illustration looks similar to what my tractor looks like except more complex.
Thanks Russell. My tractor is the same as yours. Middle injector #2 relieves excess fuel to #1 and also to #3. From #3 to injector pump via rubber hose, from #1 to fuel tank via rubber hose as well, with simple spring clamp at joints as you point out. In my tractor excess fuel over flow line from #2 injector to #1 injector and from #2 injector to #3 injector is 3/16", appears to be brass. I can blow air from #1 to #2 thru the brass tubing. I cannot blow air from #3 to #2 indicating blockage.
Since it is hose leaving injectors #1 and #3, i am thinking one should be able to cut the solid tube over flow line berween #2 And #3, clean out the debris and use hose to reconnect.
North Idaho Wolfman
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