This manual is a complete guide, including later additions. It has all the necessary information about the replacement items. The material quality is great to read.
Text excerpt from page 141 (click to view)
The motor may be stiff.
Installation 1. There is one spring on the motor assembly which fits onto the protruding plastic part on top of the motor. Position this part inside the chassis beam.
Also, make sure the belt is correctly positioned on the grooves of the shaft.
