Jonsered 450 Chainsaw Manual

The Jonsered 450 is a professional-grade chainsaw designed for demanding forestry and arborist work. It features a powerful 2-stroke engine, automatic chain oiling, anti-vibration system, inertia-activated chain brake, and easy-access maintenance points. Below are key sections for safety, features, operation, maintenance, troubleshooting, and specifications.

Features at a Glance

Key components: Professional 2-stroke engine, 18-inch guide bar, automatic chain oiler, anti-vibration handles, inertia chain brake, side-access chain tensioner, quick-release air filter.

Safety Information

Always wear proper PPE: helmet with face shield, hearing protection, chainsaw chaps, gloves, and steel-toe boots.

1. Pre-operation check: Verify chain tension, sharpness, and lubrication before each use.
2. Clear work area: Remove debris and ensure secure footing.
3. Never operate above shoulder height or with one hand.
4. Maintain secure grip: Keep both hands on handles during operation.

WARNING! Chainsaw kickback can cause serious injury. Always use proper cutting techniques and maintain chain brake functionality.

Assembly & First Use

Unpack and inspect all components. Assemble guide bar and chain.

1. Mount guide bar: Loosen bar nuts, position bar on studs, align chain drive links with sprocket.
2. Install chain: Place chain over bar with cutters facing forward, engage drive links.
3. Tension chain: Adjust tension screw until chain snaps back when pulled from bar.
4. Fuel mix: Use 50:1 gasoline to 2-stroke oil ratio (Jonsered recommended oil).
5. Priming: Press primer bulb 5-6 times until fuel is visible.
6. Starting: Set choke, engage chain brake, pull starter cord until engine fires.

CAUTION! Never run engine without proper chain lubrication. Check oil flow before cutting.

Specifications

• Engine: 45.7 cc 2-stroke, single cylinder.
• Power: 2.8 kW at 9,000 rpm.
• Max Torque: 3.2 Nm at 6,500 rpm.
• Fuel Consumption: 560 g/kWh.
• Sound Pressure Level: 112 dB(A).
• Vibration Levels: Front handle 3.2 m/s², rear handle 4.5 m/s².
• Spark Plug: NGK BPMR7A (gap 0.5 mm).
• Carburetor: Walbro WT-426 adjustable.
• Chain Speed: 22.5 m/s at max power.
• Warranty: 2 years commercial use, 1 year professional.

Controls and Components

Main components: Front handle with throttle trigger, rear handle with throttle lockout, choke control, primer bulb, chain brake lever, decompression valve, master control lever.

Control Locations: Left side: Chain brake lever, throttle lockout. Right side: Choke control, primer bulb. Top: Decompression valve, spark plug. Rear: Master control lever (combines choke/stop functions).

Operation: Pull choke for cold start, push in for warm start. Engage chain brake by pushing lever forward. Press decompression valve before starting to reduce pulling effort. Master control lever: Up=run, Middle=choke, Down=stop.

Operation Guide

Basic cutting techniques for felling, limbing, and bucking.

1. Starting procedure: Engage chain brake, set choke, pull starter cord smoothly.
2. Warm-up: Allow 30-60 seconds at idle before applying load.
3. Cutting position: Stand to left of saw, feet shoulder-width apart.
4. Felling notch: Make 70-degree open-face notch 1/3 into tree diameter.
5. Back cut: Leave 2-3 cm hinge wood, cut level with notch apex.
6. Limbing: Work from trunk outward, support saw weight with trunk.
7. Bucking: Support logs above ground, cut from top down.

Tip: Maintain chain speed during cuts; don't force saw. Let chain do the work.

Maintenance Schedule

Daily/Before use: Check chain tension/sharpness, bar condition, lubrication, air filter, fuel/oil levels, nuts/bolts tightness.

Weekly: Clean air filter (replace if damaged), check spark plug, clean cooling fins, inspect anti-vibration elements.

Monthly: Clean fuel filter, check carburetor settings, inspect clutch and sprocket, clean guide bar groove.

Seasonal: Replace fuel filter, check ignition system, inspect all safety features, replace worn parts.

WARNING! Always disconnect spark plug before performing maintenance. Use genuine Jonsered parts.

Chain Sharpening & Tensioning

Proper chain maintenance ensures optimal performance and safety.

1. Sharpening angle: 30 degrees for standard chain, 10 degrees top plate angle.
2. File size: Use 4.0 mm round file for .325" pitch chain.
3. Filing technique: File from inside out, maintain consistent angle and pressure.
4. Depth gauges: File to 0.65 mm below cutter edge using depth gauge tool.
5. Tensioning: Chain should snap back when pulled from bar, no sag on bottom.
6. Adjustment: Loosen bar nuts, turn tension screw clockwise, retighten nuts.

CAUTION! Over-tightening causes excessive wear; loose chain can derail.

Storage Guidelines

Proper storage prevents fuel system issues and corrosion.

1. Short-term (under 30 days): Add fuel stabilizer, run for 5 minutes to circulate.
2. Long-term: Drain fuel completely, run until engine stops. Remove chain, clean and oil.
3. Storage location: Cool, dry place away from ignition sources.
4. Bar/chain: Clean, oil, and store separately in dry container.

CAUTION! Never store with fuel in tank for more than 30 days. Old fuel damages carburetor.

Warranty Information

Jonsered 450 comes with 2-year commercial warranty, 1-year professional warranty from date of purchase. Warranty covers defects in materials and workmanship. Not covered: Normal wear, misuse, improper maintenance, non-genuine parts, accidental damage. Keep purchase receipt for warranty claims. For service, contact authorized Jonsered dealer or visit www.jonsered.com.

Troubleshooting

Service: For technical support: 1-800-267-0424 or www.jonsered.com