[dozerbuilder]

Here's a view of the drive motors and how they are mounted. The grub screws were used just for holding the sprockets in the correct position while the roll-pins were drilled and driven in. You can see the roll pins in the larger sprockets. The motor sprockets are roll-pinned to the motor output shafts. All shafts are short and supported in bearings at each end. The third pic shows the outer final drive shaft bearing. The frame / hull is all-welded 3mm thick steel plate. Building the frame so strong in the beginning paid off handsomely later, no twisting in such a long frame and it provide a good strong base to weld or bolt the sub-assemblies to it. The entire final drive including the motors, sprockets, shafts and bearings can be removed piece by piece if necessary.