FM-05: FM-05 SPEED WILL NOT VARY, SURGES, OR CUTS ERRATICALLY

Motor starts at no load but speed control is erratic, with dead zones, surging, or cutting out unexpectedly.

• Dirty or damaged trigger travel
• Battery contact is unstable under current
• Pack is depleted or in protection
• Switch, brush, or motor path is intermittent

1. Speed rises smoothly and predictably with trigger pressure.

1.

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• At no load the motor starts, but speed has a dead band, surges, cuts out, or ignores trigger pressure.

  At no load the motor starts, but speed has a dead band, 1. Remove the pack and dry-clean trigger, rails, terminals, and vents.

• root cause analysis
• tools needed
• step-by-step repair procedure
• diagrams
• exploded views
• post-repair checks

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