Installation Guide
Tools Needed:
- Socket wrench set
- Screwdrivers (flat and Phillips)
- Chain tensioning tool
- Bar and chain oil
- Fuel mixing container
- Safety gloves and goggles
Step-by-Step Assembly
- Unpack and Inspect: Remove all packaging materials and inspect all parts for damage during shipping.
- Handle Assembly: Attach the front and rear handles according to the provided diagram, tightening all bolts securely.
- Guide Bar Installation: Install the guide bar onto the saw body, ensuring proper alignment with the sprocket.
- Chain Installation: Place the chain onto the guide bar, following the directional arrows marked on the chain.
- Chain Tension Adjustment: Adjust chain tension using the side tensioning screw until the chain snaps back when pulled from the bar.
- Fuel and Oil Fill: Mix fuel with 2-cycle oil at 50:1 ratio. Fill fuel tank and bar/chain oil reservoir.
- Final Inspection: Check all fasteners, ensure chain brake functions properly, and verify throttle operation.
Specifications
| Model Series | CMCS 620 / CMCS 450 |
| Engine Type | 2-Cycle Gasoline Engine |
| Displacement | 45cc / 62cc |
| Guide Bar Length | 16" / 18" / 20" |
| Chain Pitch | 0.325" / 3/8" |
| Chain Gauge | 0.050" / 0.058" |
| Fuel Capacity | 14.2 oz (420 ml) |
| Oil Capacity | 8.5 oz (250 ml) |
| Dry Weight | 10.8 lbs (4.9 kg) |
| Power Output | 2.8 HP / 3.5 HP |
| Sound Power Level | 112 dB(A) |
| Vibration Level | 5.2 m/s² |
Warranty Information
- Full Warranty: 2 years residential use
- Commercial Warranty: 90 days commercial use
- Additional Coverage: Optional extended warranty available
For warranty service, contact Craftsman Customer Service at 1-888-331-4569 or visit Craftsman.com
Key Features
Anti-Vibration System
Advanced anti-vibration handles reduce user fatigue by minimizing vibration transfer from the engine to the operator's hands.
Automatic Oiling System
Built-in automatic chain oiler ensures consistent lubrication of the bar and chain during operation, extending component life.
Quick Chain Tensioner
Side-mounted chain tensioning system allows for quick adjustments without additional tools, maintaining optimal chain tension.
Inertia Chain Brake
Safety feature that automatically stops the chain in kickback situations, providing additional operator protection.
Air Injection System
Centrifugal air cleaning system removes larger dust particles before they reach the air filter, extending filter life.
Decompression Valve
Reduces compression for easier starting, especially important in cold weather conditions.
Safety Features Explained
Chain Brake
Stops chain rotation within milliseconds during kickback events
Throttle Lockout
Prevents accidental throttle engagement during starting
Right Hand Guard
Protects operator's hand from chain contact
Spark Arrestor
Prevents emission of burning carbon particles
Chain Catcher
Catches broken chain to prevent injury to operator
Vibration Dampeners
Rubber mounts reduce vibration to operator's hands and arms
Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Engine won't start | Old fuel, clogged spark plug, flooded engine | Use fresh fuel mix, clean/replace spark plug, wait 10 minutes and try again |
| Engine starts then dies | Clogged fuel filter, dirty air filter, carburetor issues | Replace fuel filter, clean air filter, adjust carburetor |
| Chain won't turn | Chain brake engaged, clutch issues, chain too tight | Disengage chain brake, inspect clutch, adjust chain tension |
| Excessive vibration | Loose fasteners, unbalanced chain, worn bar | Tighten all fasteners, sharpen chain evenly, replace worn bar |
| Chain throws oil | Overfilled oil tank, wrong oil viscosity | Maintain proper oil level, use recommended bar and chain oil |
| Poor cutting performance | Dull chain, incorrect filing angles, worn sprocket | Sharpen chain properly, maintain 30° filing angle, replace worn sprocket |
Maintenance Codes
- Daily: Check chain tension, clean air filter, inspect bar and chain
- Weekly: Clean spark arrestor, check all fasteners, clean cooling fins
- Monthly: Replace spark plug, clean fuel filter, inspect clutch
- Seasonal: Replace air filter, clean carburetor, check anti-vibration mounts
- Annual: Replace fuel lines, check piston and cylinder, replace worn sprocket
Manual Downloads
Current Model Manuals
CMCS 620
62cc Professional Chainsaw
CMCS 450
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CMCS 320
32cc Compact Chainsaw
CMCS 800
80cc Professional Chainsaw
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