rear power truck-rear axle has split gear ,can't seam to get an answer on whether or not   they can fix it ,such as can they press a new gear on it or can one just purchase a power truck-engine in good shape  just hate to see it done for

thank you to every one who responded to my dilemma of my Bachmann engines not running right,3 of 4 engines are running strong and pulling there loads in all there glory,unfortunately the Heisler is down due to a split gear on one of the drive axles,pretty much all info was addressed  and engines were still giving me problems,so whats the ole motto,if all else fails  look at the owners manual,and one area that I must have over looked was to put conductive lubricant on the drive wheels-bingo-they're running now  2 days strong,again thank you everyone who responded and helped me out
Bryan

I have several Bachmann g-scale engines ( 0-4-0,4-6-0, a two truck shay and a heisler ),they start out fine then will start to jerk/sputter for a few feet  then run fine and then starts all over again,track is clean and polished ,connections are tight ,drive wheels and trucks are clean,my other engines run fine with no problems,where do I need to look  or do to make this engines   run  again,thanks-=