Worm wheel SCHAERER Spare Parts 3370072250

A worm wheel transfers rotary motion between shafts set at right angles, converting high-speed motor rotation into slower, controlled movement. The helical teeth of the worm mesh with the wheel's gear, creating a self-locking drive that prevents back-driving. This principle ensures steady, precise adjustment of burrs in coffee grinders and dosing mechanisms in espresso machines, where even slight play can alter grind size or extraction time.

The operator does not handle the wheel directly; it is installed inside the gearbox housing. Once fitted, the wheel rotates continuously as the motor runs, maintaining consistent torque without manual intervention. Its position within the gear train determines the final speed and force delivered to the grinding or brewing components.

Constructed as a single-piece worm wheel, this part is machined to match the original SCHAERER gear profile. The material and tooth geometry are standardised for compatibility with the manufacturer's gearboxes, ensuring quiet operation and long service life under frequent use.

Cleaning is limited to the exterior of the gearbox; the wheel itself is not exposed to coffee grounds or water. Regular inspection for wear or misalignment is recommended, as any deviation in tooth contact can affect grind consistency or dosing accuracy.

This worm wheel z28 is a direct replacement for SCHAERER coffee equipment, including grinders and espresso machines that use the specified gear ratio.