The primary cause of squeaking under load after a slide is drive belt misalignment or incorrect tension. Confirm this by inspecting if the belt tracks against the side flange of the pulleys rather than remaining centered. Verify the tension by applying 10 lbf of force to the belt and measuring the deflection; factory specifications typically require 1.5–4mm of deflection. Observe the belt edges for rubber shavings or fraying, which confirms active friction against metal components.
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