What steps should I take if the walking belt slows down while using the treadmill?
Use only the recommended surge suppressor and ensure it meets specifications on page 11. Loosen a tightened belt by turning both idler roller screws counterclockwise, then reconnect power and test after making adjustments (Page 22).
From the official NordicTrack T 5 7 Treadmill manual, page 22
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