Technical information

Practical A.E.G Upgrade 2006

What cause the piston gear to break prematurely?

Let’s recall what we have talked about regarding the installation of long spring.

The sector gear keeps rotating anti-clockwise, and the piston is being driven to

(almost) the leftmost position. If the spring is too long (meaning the “length

before set” of the spring exceeds what can be accommodated by the piston at

the leftmost position) and if the motor insists on running, the sector gear that

keeps rotating will either break itself or the piston gear. Since the piston gear is

usually of a weaker construct than the sector gear, it is the one that is ultimately

broken. Check and see if your spring is too long or if there are too many spacers

in use (sometimes a spring with too many coils together with a ball bearing

spring guide can be the cause of such problem).