B7500 Stalls w/load

[lloydtilton]

Just finished a 50 hr service w/ parts and fluids from Kubota this was at 64 hrs. Now great rpms until I put a load in front loader--then she stalls, coughs, sputters, sometimes dies. Fuel filter not cloudy, all filters replaced, fluids too from Kubota --could use some help, Thanx RJ

 

[wushaw]

Stalls in what manner?
Moving.
Only using hydraulics.

 

[dillo99]

when you say all filters replaced, did that include the air filters?

Does this only occur with a load on the loader? what about load on 3ph or pushing a load with the tractor?

 

[lloydtilton]

More often than not she'll stall after some hydraulics. I'm currently removing snow-5-7 mins. worth of movement -shaving off layers of snow, using hydraulics both front loader and forward and backward motion--then sputter, choke, die--this after new load of diesel. Changed the primary air filter--wasn't sure of the secondary.

 

[lloydtilton]

I changed the larger of the two(primary) i think--the innards are to be changed as well? Usually stalls after 5-10 mins worth of front loader (light loads) sputters, coughs, chokes, and dies--this after draining the tank and reload of fresh diesel. Is it possible to hav etoo much hyd. fluid in the machine. I changed it according to the specs and seems like the dip stick was over the full mark--thanks

 

[wushaw]

Ok the machine will run for 5-10min then sputter and die.
You most likely have a intake or fuel problem, check for obstruction in intake.

 

[lloydtilton]

Kinda new at this--where to look andwhat should I be seeing there. Thx!

 

[MarkLeininger]

Just finished a 50 hr service w/ parts and fluids from Kubota this was at 64 hrs. Now great rpms until I put a load in front loader--then she stalls, coughs, sputters, sometimes dies. Fuel filter not cloudy, all filters replaced, fluids too from Kubota --could use some help, Thanx RJ

It can't be a coincidence that this started after you did the service. Could it be sucking air into the fuel system because something is loose? Besides the obvious of tightening the fuel filter, did you disconnect any lines, maybe leave a connector loose? Did you bring it inside where it's warm to work on it and some snow or ice melted, maybe got in the fuel tank or fuel system? Did you fill the tank while you had it inside and maybe used some fuel that had water in it? I'd think about everything you changed or touched while you were servicing it.

 

[lloydtilton]

Thanks for the input--will try to drain the fuel filter and check the "O" rings. Thx again RJ

 

[lloydtilton]

Replaced both "O" rings in the fuel filter,emptied the fuel filter, recleaned secondary air filter. Let the machine sit for 10-15 min. restart--initial cloud of black smoke--idled for 5-6 min-revved up nice then coughed , sputtered and regained normal idle (sort of) after I slowed the idle speed. Seems like after it heat up something expands and affects the intake--Open to suggestions!

 

[dillo99]

wow...I don't know. Definitely sounds like an air or fuel problem - one or the other is being limited somehow. I doubt it has anything to do with your hydraulics.

 

[lloydtilton]

Thanks Mike--went to the Kubota shop--they swear its fuel so I'll drain the take AGAIN--look for water--hunt for an additive to clear injectors--and keep finders crossed!! Cats are good for doorstops and Teriyake-did I say tha outloud!

 

[lloydtilton]

O.K.--HERE'S THE SKINNY---DRUM ROLL!!!!!!!!!! Apparently when I changed the fuel filter I forgot to fill the filter and bowl before reassembling it to the tractor. Hence the Air in the fuel system***--So to fix the problem follow the rubber hose up from the fuel filter to a nut that is between two rubber hoses. 14mm box wrench loosen the nut--have someone crank(not start) the engine--I saw 6-8,9 small pinhead bubbles come out until it "cranked" fuel--tightened her down--NO Stall w/Load-runs great--just as it begins to snow again. If that didn't work next stop loosen an injector and crank it clear of bubbles.

 

[kevinj]

O.K.--HERE'S THE SKINNY---DRUM ROLL!!!!!!!!!! Apparently when I changed the fuel filter I forgot to fill the filter and bowl before reassembling it to the tractor. Hence the Air in the fuel system***--So to fix the problem follow the rubber hose up from the fuel filter to a nut that is between two rubber hoses. 14mm box wrench loosen the nut--have someone crank(not start) the engine--I saw 6-8,9 small pinhead bubbles come out until it "cranked" fuel--tightened her down--NO Stall w/Load-runs great--just as it begins to snow again. If that didn't work next stop loosen an injector and crank it clear of bubbles.

Interesting............my 7500 has an auto shut off when you remove the bowl. By the time it is back in place the bowl is running over. Job done.

 

[MarkLeininger]

Thanks for posting solution, I like hearing how these things get resolved.

 

[easygo]

lloydtilton,
Thanks for posting this. Could be helpful for the rest of us in the future.

 

[lloydtilton]

My posting was a thanx for those who offered a possible solution; an hopefully helpful to those who come after. Manually filling the filter bowl leaves a "bubble". Once you get one or two threads on the stationary lid(not a firm bite) there is (I'm told later) an auto fill aspect to the B7500 that will fill the bowl to a spill over--which is what you want to prevent a bubble in the system. Thanx to Mark for the tactful observation that all was well until IK laid my hands on it and to Back track all I touched--Thanks again!! Now--I need suggestions for a reasonabley priced B7500 shop manual. Let's seee what else I can break--Thanxx all--RJ