627 uses the 627-101 motor truck. It is nearly the same as the 600-101 truck, except it has the pilot and steps on the truck, not on the frame. At the bottom of the motor shaft there should be a 600-110 bearing ball and on top of the commutator there should be a nylon thrust washer 600-129. The bearing balls are usually highly polished and with a little light it can usually be seen in the bottom of the hole. The diameter of the ball is 5/64” or 0.0781”. If this is the magnitude of the free play, the ball is probably missing. Do not over look the thrust washer on the commutator. It prevents the commutator from hitting the brush plate. If the ball is still there, but you believe there is excess axial clearance, an additional 600-129 thrust washer can be added. Be sure that the brushes are of adequate length, as adding a washer in this position makes brush length a more significant issue.
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