failure mode
FM-20: FM-20 CHUCK ROTATES, BUT IMPACT ACTION IS ABSENT UNDER LOAD
FM-20 CHUCK ROTATES, BUT IMPACT ACTION IS ABSENT UNDER LOAD
Diagnostic overview
FM-20 CHUCK ROTATES, BUT IMPACT ACTION IS ABSENT UNDER LOAD
Likely Root Causes
- Test was only at no load, where impacts may not occur
- Battery is weak or accessory is unsuitable
- Fastener offers too little resistance to engage impacts
- Hammer, spring, anvil, or impact case has failed
Quick Checks
- Distinct impact pulses begin under normal fastening resistance.
Repair Preview
1.
This is a preview of the troubleshooting guidance included in the full repair manual.
Common Fixes
- Charged pack
Related symptoms
The bit rotates, but no impact pulses begin when a correct fastener provides normal resistance.
The bit rotates, but no impact pulses begin when a 1. Remove the pack and fit a correct impact-rated bit that matches an
Included in the full manual
- root cause analysis
- tools needed
- step-by-step repair procedure
- diagrams
- exploded views
- post-repair checks
Public pages show a preview only. Purchase the full manual to download complete repair steps, diagrams, and verification procedures.