I have a 2008 model 6330 (standard / non premium) that the glow plug warning light and audible alarm comes on when driving in road gear at full throttle. You can road it at 2000 rpm and without issue. Dealer has tried twice to repair but tractor does not set a code. Last trip they changed all filters and fluids which corrected problem for a short time. After issue started again I changed transmission filter and checked sump screen; did not correct problem. Any ideas?
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