It sounds like you've already tried several troubleshooting steps, but let's see if we can narrow down the issue with your Wascomat W655 commercial washer. Here are some additional things to consider:
Motor Capacitor: The motor capacitor plays a crucial role in starting the motor. If it's faulty, the motor might not engage properly. Consider checking or replacing the motor capacitor.
Motor Wiring: Inspect the wiring connections to the motor. Loose or damaged wires can prevent the motor from functioning correctly. Ensure all connections are secure and free from damage.
Motor Brushes: The motor brushes wear out over time. If they're worn down, the motor won't engage. Check the brushes and replace them if necessary.
Belt Tension: If your washer has a belt-driven motor, ensure that the belt is properly tensioned. A loose or damaged belt can cause motor issues.
Drain Pump: Although you mentioned that the drain pump seems to be working fine, it's still worth verifying. Sometimes a malfunctioning drain pump can affect other components.
Mechanical Obstructions: Inspect the drum and surrounding components for any obstructions. Something lodged in the drum or motor assembly could prevent movement.
High-Speed Spin: Since the issue occurs during the high-speed spin, focus on components related to this phase. It could be related to the motor, belt, or even the drum balance.
A professional technician could perform more advanced diagnostics.
If you haven't already, you might find it helpful to consult the diagrams and manuals specific to the Wascomat W655 washer. Alliance Laundry Systems provides replacement parts and repair resources.
Diagrams, Parts and Manuals for Wascomat W655 Washer (alliancelaundry.com)
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