Plarail Oliver Replacement

[Super]

As long as you aren't confusing a crack for the jagged separation between the gear and clutch as in the picture. At any rate, how the clutch works is...the clutch is stationary and should not move. when the gear fits in the jagged separation held there by the spring, is how its supposed to be with no slippage, when the jagged separation becomes worn or the spring pushing the gear becomes weak, the gear can overcome the spring pushing off the jagged separation from the clutch causing the trains gear to slip which is supposed to happen to save all the gears and the motor if the train is held in place while the motor is on which happens often with little hands playing with them. So, to sum it up, if the clutch side of the gear is moving then the clutch is spinning on the axle which is not supposed to happen. If the gear easily spins on the stationary clutch then its either the jagged separation between the two that is worn or the spring itself is weak. Temporary fixes can be done for either way but a complete change of the axle is the best way using sacrificial parts engines.