16-07-2014, 12:30 PM
Hi.
I have a Wickes chain driven type 1 (ie with limit switch assembly) garage door opener I fitted nearly 20years ago. When it recently jammed and then made horrible noises and stopped working I didn't expect to be able to get parts for such an old system. I took it apart and found that the nylon gear wheel teeth were stripped off and the case was filled with nylon shrapnel. I surprisingly easily got a replacement gearwheel and fitted it. I put it up and tested it. But the trolley moved only about a foot then reversed a little way then stopped. Every time I tried it, it did the same. This was with the door disconnected so there was little resistance to trolley movement. I tried adjusting the up and down travel limits and the up & down force, but it made no difference. I took the unit down and opened it up and thinking maybe the mechanism was sensing a resistance such as a stuck door I disconnected the 90deg drive from the main gear wheel to the 2 screw driven limit switches. This made no difference, so I completely removed the drive to the sprocket including the gearwheel that meshes with the worm and this made no difference. So what is causing the motor to rotate a few turns then reverse and stop after a few more turns? Many thanks for a clue or any help in getting this going. John
I have a Wickes chain driven type 1 (ie with limit switch assembly) garage door opener I fitted nearly 20years ago. When it recently jammed and then made horrible noises and stopped working I didn't expect to be able to get parts for such an old system. I took it apart and found that the nylon gear wheel teeth were stripped off and the case was filled with nylon shrapnel. I surprisingly easily got a replacement gearwheel and fitted it. I put it up and tested it. But the trolley moved only about a foot then reversed a little way then stopped. Every time I tried it, it did the same. This was with the door disconnected so there was little resistance to trolley movement. I tried adjusting the up and down travel limits and the up & down force, but it made no difference. I took the unit down and opened it up and thinking maybe the mechanism was sensing a resistance such as a stuck door I disconnected the 90deg drive from the main gear wheel to the 2 screw driven limit switches. This made no difference, so I completely removed the drive to the sprocket including the gearwheel that meshes with the worm and this made no difference. So what is causing the motor to rotate a few turns then reverse and stop after a few more turns? Many thanks for a clue or any help in getting this going. John