Adjust the the stirrer W15
To address this issue, please adhere to these instructions:
Please follow the instructions below or download a file W6-W15 - Adjusting the stirrer resistance
Adjusting the Cooling Tray Mixer Resistance W6-W15 series
If the mixer in the cooling tray stops when handling a large batch of beans, the motor resistance may need adjustment.
Instructions
- Locate the Motor
Find the motor at the back of the machine that drives the cooling tray axle.
You will see a crown nut that can be adjusted.

- Unlock the Crown Nut
The nut is secured with a locking ring.
To unlock it: straighten one of the bent pins on the locking ring. - Adjust the Resistance
- Lock the Nut
- Use the small key from the toolset.

- Turn the crown nut clockwise to increase resistance.

- Once the adjustment is complete and the nut is properly tightened:
- Secure it by bending one of the pins in the locking ring back into place.


Result
After completing these steps, the cooling tray mixer should operate smoothly, even with a full batch of beans.
If cleaning and adjusting the resistance does not solve the issue, I suggest inspecting the gear rotation. If the gears become stuck at specific turns, it may indicate that they require adjustment or replacement.