370 Chainsaw Manual

The 370 Chainsaw is a professional-grade chainsaw designed for heavy-duty cutting applications. This manual covers the complete operation, maintenance, and safety procedures for the 370 model. Below are key sections for safety guidelines, technical specifications, assembly instructions, operation procedures, maintenance schedules, troubleshooting, and warranty information.

Safety Guidelines

Essential safety precautions for operating the 370 chainsaw. Always wear proper protective equipment including safety glasses, hearing protection, gloves, chainsaw chaps, and steel-toed boots.

Safety Item	Requirement
Personal Protective Equipment	Must be worn at all times during operation
Work Area Safety	Clear area of bystanders, pets, and obstacles
Kickback Prevention	Maintain proper grip and stance; use chain brake
Fuel Safety	Refuel only when engine is cool, in well-ventilated area
Transport Safety	Engage chain brake, use scabbard when carrying
Starting Safety	Place on ground, secure position before starting
Cutting Safety	Plan escape path, be aware of falling hazards
Maintenance Safety	Disconnect spark plug before servicing
Environmental Safety	Check for wildlife, avoid cutting near power lines
Emergency Procedures	Know how to stop engine quickly in emergencies

Technical Specifications

Detailed technical specifications for the 370 chainsaw model.

1. Engine Type: 2-stroke gasoline engine
2. Displacement: 70.7 cc (4.3 cubic inches)
3. Power Output: 5.2 HP (3.9 kW)
4. Fuel Capacity: 0.55 liters (18.6 fl oz)
5. Oil Capacity: 0.26 liters (8.8 fl oz)
6. Bar Length Options: 16", 18", 20"
7. Chain Pitch: 3/8"
8. Chain Gauge: 0.050"
9. Weight (without bar/chain): 6.2 kg (13.7 lbs)
10. Ignition System: Electronic ignition

WARNING! Use only manufacturer-recommended fuel and oil mixtures. Incorrect fuel can cause engine damage.

Assembly Instructions

Step-by-step assembly instructions for your new 370 chainsaw.

1. Unpack all components: chainsaw body, guide bar, chain, scabbard, tools, manual.
2. Attach guide bar: Loosen bar nuts, position bar on studs, align adjustment pin.
3. Install chain: Place chain over sprocket, ensure cutting teeth face forward.
4. Tension chain: Adjust tension screw until chain snaps back when pulled from bar.
5. Secure bar nuts: Tighten nuts to specified torque (8-10 Nm).
6. Fill oil reservoir: Use recommended bar and chain oil.
7. Mix fuel: 50:1 gasoline to 2-stroke oil ratio (89 octane minimum).
8. Prime carburetor: Press primer bulb 5-6 times until fuel is visible.
9. Check controls: Verify throttle, choke, and chain brake operation.

CAUTION! Always wear cut-resistant gloves when handling chain. Ensure proper chain direction before starting.

Operation Procedures

• Starting Procedure: Engage chain brake, set choke, pull starter cord until engine fires, disengage choke, restart.
• Warm-up Period: Allow 30-60 seconds of idle operation before cutting.
• Cutting Operation: Use full throttle during cuts, avoid pinching bar, maintain secure footing.
• Shutdown Procedure: Allow idle for 30 seconds, engage chain brake, turn off engine.
• Transport: Always use scabbard, engage chain brake, carry with bar pointing backward.
• Refueling: Stop engine, allow to cool, clean area, use fuel funnel, wipe spills immediately.
• Chain Lubrication: Automatic oiler with manual override for heavy cutting.
• Emergency Stop: Release throttle trigger, engage chain brake, turn off ignition.

Maintenance Schedule

Regular maintenance schedule to ensure optimal performance and longevity.

Daily: Check chain tension, sharpen chain, clean air filter, inspect bar for wear, check oil level.

Weekly: Clean spark arrestor, check spark plug, inspect fuel filter, clean cooling fins, check all bolts/nuts.

Monthly: Replace air filter, check carburetor adjustment, inspect anti-vibration mounts, check clutch drum.

Seasonally: Replace spark plug, clean fuel tank, inspect fuel lines, check ignition system, service carburetor.

Annual: Professional tune-up, compression test, replace worn components, complete safety inspection.

Cutting Techniques

Proper cutting techniques for various applications.

1. Felling Trees: Plan escape route, make notch cut, then back cut, use wedges for large trees.
2. Limbing: Work from trunk outward, cut downward on top side of limb.
3. Bucking: Support log properly, cut from top down, avoid cutting into ground.
4. Pruning: Use tip of bar for precision cuts, maintain control at all times.
5. Slabbing: Use dogs for leverage, make parallel cuts along grain.

Tip: Keep chain sharp - a sharp chain requires less force and produces less kickback.

Chain & Bar Maintenance

Proper maintenance of cutting components.

1. Chain Sharpening: Use proper file size (5/32" for standard chain), maintain 30° angle, equal strokes per tooth.
2. Depth Gauge Setting: File depth gauges to 0.025" below cutting edge.
3. Bar Maintenance: Rotate bar regularly, file rails if burred, clean oil holes.
4. Chain Tension: Adjust when chain sags, check when hot and cold.
5. Sprocket Inspection: Replace if worn (teardrop shape indicates wear).
6. Oil Flow Check: Run at idle pointing at light surface - should see oil line.
7. Chain Replacement: Replace when stretched beyond adjustment, damaged, or excessively worn.
8. Bar Replacement: Replace if rails are worn unevenly or groove is widened.

WARNING! Always stop engine and disconnect spark plug before performing chain maintenance.

Engine Care

Engine maintenance procedures for optimal performance.

Air Filter: Clean daily in dusty conditions, replace when damaged. Fuel System: Use fresh fuel (30-day maximum storage), clean fuel filter regularly. Spark Plug: Clean and gap to 0.020", replace annually. Carburetor: Adjust only if necessary, factory settings optimal for most conditions. Cooling System: Keep fins clean, ensure air flow unobstructed. Exhaust System: Clean spark arrestor weekly, check for carbon buildup.

Storage Guidelines

Proper storage procedures for seasonal or long-term storage.

Short-term (1-4 weeks): Drain fuel from carburetor, run until dry, clean unit, store in dry location.

Long-term (over 1 month): Drain all fuel, run until dry, remove spark plug, add oil to cylinder, pull starter slowly, reinstall plug, clean thoroughly, store in dry, protected area.

CAUTION! Never store with fuel in tank for extended periods. Fuel deteriorates and can damage engine components.

Warranty Information

Commercial Use: 90-day limited warranty from date of purchase. Residential Use: 2-year limited warranty. Warranty covers defects in materials and workmanship. Not covered: Normal wear, misuse, improper maintenance, accidental damage, unauthorized repairs. For warranty service, contact authorized service center with proof of purchase. Keep this manual and purchase receipt for warranty claims.

Troubleshooting

Symptom	Possible Cause	Corrective Action
Engine won't start	No fuel, flooded, bad spark	Check fuel, wait if flooded, check spark plug, clean air filter.
Engine starts then dies	Fuel filter clogged, carburetor issue	Replace fuel filter, clean carburetor, check fuel lines.
Poor cutting performance	Dull chain, improper tension	Sharpen chain, adjust tension, check bar condition.
Chain won't stop moving	Clutch stuck, throttle stuck	Clean clutch, check throttle mechanism, replace if worn.
Excessive vibration	Chain unbalanced, loose components	Sharpen chain evenly, tighten all bolts, check anti-vibration mounts.
Oil not flowing to chain	Clogged oil passages, pump failure	Clean oil holes, check oil pump, use proper oil viscosity.
Overheating	Dull chain, lean fuel mixture	Sharpen chain, adjust carburetor, clean cooling fins.
Loss of power	Clogged exhaust, worn piston	Clean spark arrestor, check compression, rebuild if necessary.

Service: For technical support contact 1-800-CHAINSAW or visit www.chainsaw370manual.com