Hello, I am new here long time viewer though. I am having issues with my ztrack. It has 1835.4 hours on it right now and here what it's doing. Once I have been mowing for an hour or so sometimes less sometimes more it starts loading power and sputtering and back firing and I have to disengage the pto and pull up on choke to keep it going. I just have to sit there holding the choke till I hear it needing fuel then I take the choke off and it just surges up and down. If I let it sit and cool down I can mow again just fine with no issues for about and hour or so then it starts all over. In the last week I have changed the cylinder heads, valves, coil packs, spark plugs, fuel filter, fuel pump, fuel lines I cleaned the magnet on the fly wheel changed the oil and filter and air filter. The only thing I have been able to do is when it's running bad is I spray carb cleaner into the intake it picks back up I can actually keep it running with little sprits of carb cleaner. I took the carb apart and all the jets and everything is clear I know it could be a carb issue but you would think it would run bad all the time? I am lost and I have 856 acres growing out of control and this mower down all help tips and comments welcome!!!
John Deere ztrack 830a impossible problem to pin point here!!! Please help
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Nwatson99
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Sounds like a coil breaking down, had the same thing last year on my Z930A.
Just get you two new coils and replace them.
DO Not spray carb cleaner, starting fluid or any of that junk until you know for sure that the carb is the problem.
Just get you two new coils and replace them.
DO Not spray carb cleaner, starting fluid or any of that junk until you know for sure that the carb is the problem.
I changed them 2 days ago gaped to spec 00.8 and I took the cover off and checked them again both are still 0.08 also when it's running bad I have pulled the wires of each plug and it still sutters and such so I know it's getting spark
I really don't think it's a carb problem I am not saying it's not but I don't see how it would run fine for hours like I put 6 hours on it yesterday before it started messing up again if it was the carb I don't see how it would run that long with no issues?
Nwatson99
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I don't think it is a carb problem also and after going through it last year that is screaming firing system overheating.
Did you change the plugs also?
Last year I changed the fuel pump, fuel filter, inner and outer air filters, plugs, then low and behold it was the dang coils.
Yes on Monday when I changed the coils. To me it seems like a firing system problem too but it's all new? The only thing I noticed was today when I took the carb off there is carbon on the left side for the left cylinder but it had been back firing. Seems on the left side. I think there is a fuse for the coils but if it was bad I don't think it would fire at all. Next I could try the connections from the coils to the wiring harness?
It almost sounds like it is vapor locking, where you have to chock it to keep it running that tells me it is starving for fuel and you said if you let it cool down its fine till it gets hot again. I am not familiar with your unit but if the fuel pump is old and getting weak its more likely to vapor lock, just food for thought. Might try a diffrent grade of gas might help
Nwatson99
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Did you do the filter also?
Nwatson99
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Yes sir I only run premium in my Z960R and the Z930A as well and when I put the new plugs in the 930 last year they still looked new like they were only a few months old.