CRAFTSMAN CMCF800C1 Repair Manual

Comprehensive repair guide for the CRAFTSMAN CMCF800C1 V20 Impact Driver, including troubleshooting, maintenance, and step-by-step repair instructions.

$39.99

Last updated Aug 8, 2026, 9:45 AM

About this manual

Comprehensive repair guide for the CRAFTSMAN CMCF800C1 V20 Impact Driver, including troubleshooting, maintenance, and step-by-step repair instructions.

0% Reported Successful Repair

Price

$39.99

Full Manual Includes

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

Table of contents preview

Craftsman Cmcf800c1 V20 Impact Driver
Craftsman Cmcf800c1
The Six Things That Matter Most
What This Model Actually Has
Indicator And Signal Map
Model-revision Warning
The Power And Torque Path
Normal Use Sequence
Normal Behavior That Can Look Like A Fault
Moved
Lock
Fm-08 Battery Will Not Release From The Tool
FM-23 FASTENER CAMS OUT, STRIPS, SNAPS, OR IS
Overdriven
Fm-02/fm-04/fm-05/fm-19/fm-21/fm-22/fm-25-fm-28/fm-30.

This preview shows only a portion of the complete repair manual. Purchase to access the full repair documentation, downloadable PDF and detailed repair procedures.

Supported model

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Power Tool Batteries

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CRAFTSMAN

Cmcs500m1

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CRAFTSMAN

Cmcd700c1

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CRAFTSMAN

Cmcb204

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CRAFTSMAN

Dcs578

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CRAFTSMAN

Dcs575

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CRAFTSMAN

Dcw210

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CRAFTSMAN

Dcb115

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CRAFTSMAN

Gsr18v 190b22

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CRAFTSMAN

Gks18v 25 Gks18v 25n

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CRAFTSMAN

Bat414

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CRAFTSMAN

Gdx18v 1800

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CRAFTSMAN

Gba18v40

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A charged pack is installed, but the trigger produces no worklight, motor sound, or anvil movement.

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With no fastener load, speed surges, has a dead band, cuts out, or ignores trigger travel.

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A sound impact-rated 1/4-in. hex accessory will not enter fully or lock in the quick-release chuck.

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The tool starts and runs at no load, but stops abruptly on an ordinary fastener with no jam or twist.

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TOOL IS COMPLETELY DEAD - NO LED OR MOTOR

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WORKLIGHT COMES ON, BUT THE MOTOR WILL NOT START

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The trigger lights the work area, but the motor stays silent and the anvil does not move.

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The forward/reverse button will not seat, center lock-off fails, or the tool runs the wrong way.

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The collar pulls but the installed accessory will not come out, or a broken piece is trapped in the chuck.

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The tool works normally, but a fully charged pack empties much sooner on the same light task.

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TRIGGER STICKS, WILL NOT RETURN, OR MOTOR KEEPS RUNNING

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The trigger binds, fails to spring off, or the motor remains powered after release.

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A compatible-looking pack will not slide fully into the handle, click, or stay retained.

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The tool or pack becomes unusually hot, or operation stops only after heat builds.

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The bit inserts, but the collar does not return or a firm tug pulls the bit out.

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The trigger returns and motor power ends, but the chuck repeatedly coasts much longer than normal.

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The release button moves poorly or the pack remains trapped on the tool rails.

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A known-straight, fully retained 1/4-in. hex bit traces a visible circle at no load.

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Bright repeated arcing or sharp crackling is visible at the rear vents while the tool runs.

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The tool works until the pack, handle, or tool is bumped or shifted, then loses power.

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Motor sound is present, but the anvil and installed bit remain stationary.

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The housing, handle, rails, nose, vents, lens, or accessory mount is cracked or loose.

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The included compatible charger shows no status light and will not begin charging a sound pack.

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Smoke, burning odor, melting, liquid, active sparks, swelling, hissing, or severe pack damage is present.

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The bit rotates, but a real fastening load never produces the normal impact sound or pulses.

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The charger shows charging or hot/cold delay, but the pack never reaches its normal charged indication.

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With no accessory load, the front drive makes abnormal metallic noise or feels rough.

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Rotation and impact pulses are steady, but a normal fastener advances much more slowly than expected.

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The motor and anvil run normally, but the LED does not light the immediate work area correctly.

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The trigger returns and the motor is stopped, but the LED remains on far beyond about 20 seconds.

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The accessory slips from the fastener, damages it, breaks it, or drives it beyond the intended seat.

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The quick-release collar binds, will not move fully forward, or stays forward after release.

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The accessory or fastener stops in the work and the tool stalls, twists, or cannot be withdrawn normally.

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FM-01: FM-01 TOOL IS COMPLETELY DEAD - NO LED OR MOTOR

Summary

The tool is completely dead with no LED or motor response despite a charged battery pack being installed.

Full repair guide includes

Root Cause Analysis
Required Tools
Replacement Parts
Step-by-step Repair Procedure
Safety Precautions
Verification Checklist

CRAFTSMAN CMCF800C1 Repair Manual

Manual information

About this manual

Full Manual Includes

Table of contents preview

Supported model

Related Categories

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Common Symptoms

Failure Modes

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