Chamberlain ML500 engine trolley (internal part) (delivered without the chain)

Attention it is only the inner part of the trolley, the outer part with the release string is sold separately.

Chamberlain/Liftmaster Carriage Replacement Steps :

In order to replace the carriage of your motor, you have to disassemble the rail with the chain. The easiest way to do this is to stand on trestles, as working at height at arm's length would quickly become tiring.

1. Unhook the arm connecting the trolley to the garage door.

2. Remove the motor head from its ceiling mount.

3. Do the same with the rail fastening on the lintel.

4. 4. Place on trestles to loosen the chain: at the end of the rail you will find the chain tensioner with a nut and the compression spring.

5. Once the chain has been slackened, remove the motor head and then take out the carriage (the inner part of which is just connected to the chain by two quick-release fasteners).

6. Repeat these steps in reverse to reinstall the motor.

Compatible with the following engines :