If you rebuild a gear motor with new parts and find it turns freely by hand, what is likely the problem?

When a gear motor turns freely by hand after being rebuilt with new parts, it suggests that there is an issue with the fit of the components. Specifically, if the gears and casing are fitted too loosely, it can lead to excessive play or clearance between the gears and housing. This can result in the motor being able to turn freely without any resistance, which indicates that it is not functioning properly under load.

In a well-functioning gear motor, there should be an appropriate amount of engagement between the gears and the casing to ensure that the motor operates effectively and can withstand the pressures and forces generated during operation. If the fit is too loose, the motor may not be able to generate sufficient torque or maintain the required pressure, leading to unsatisfactory performance in its application. Therefore, acknowledging the importance of proper fit in gear motors is crucial in understanding their operation and troubleshooting issues related to performance.