PS2 ABA Second A Unit Dragging Rear Truck at Slow Speed

The slave doesn't have a tach reader on either motor.  If it's dragging the one truck, my guess is there's excessive friction in either the motor or the truck gears.

Agree with John, the slave isn’t selective. If there’s power being applied to the motors, it’s equal. You need to be looking at obstructions, or foreign objects like ballast crunched up in the gears that can cause a drag. The motor itself could also be suspect. Pretty easy to swap that out. Although I’d rule out all other environmental factors, such as truck binding, etc. Check fasteners for tightness. A loose mounting screw can cause the motor to lean a touch, & that’s enough to make a slight load on any one motor.

Pat

Thanks for the info, I'll pull it apart more tonight and look for something that might be binding the drive up. I'm assuming since the set is older probably needs fresh grease.

You could also try a spritz of electronics cleaner INTO the lazy motor.  If it was stored in a damp environment, perhaps the brushes/commutator are oxidized and will burnish with regular use?