The Bachmann Williams shows the GP-9 geared truck available as an assembly with the coupler for around $42.00. About two years ago the helical gear and drive axle joint failed, helical gear was free spinning causing no motor torque transfer from the worm gear on the motor shaft to the wheel axle, after disassembling the motor truck assembly the teeth on the helical gear and motor pinion gear looked okay. I used a Locktite Bearing Retaining compound to bond the gear to the motor shaft, this must be done after reassembly, both the gear bored hole and shaft must be clean for this retaining compound to bond. I recommend using a micro brush to apply this retailing compound to the contact surface of the gear and shaft, side the gear sideways to increase the bond contact area. Do no allow this retaining compound to flow into the adjacent bearing area of truck block if done properly the shear strength of this retaining compound will transmit the required torque. Allow 24 hours for this bond to fully develop. I did not want to use a Locktite retaining compound that requires heat to break the bond. Replace helical gears are available from Timko.
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