Husqvarna Chainsaw Repair Manual

The Husqvarna Chainsaw Repair Manual provides comprehensive guidance for maintaining, troubleshooting, and repairing Husqvarna chainsaws. It covers safety precautions, engine systems, cutting components, fuel systems, ignition systems, lubrication, starting mechanisms, and routine maintenance procedures for various Husqvarna models. Below are key sections for safety, features, maintenance, repair, and troubleshooting.

Safety Precautions

Essential safety guidelines before operating or repairing a Husqvarna chainsaw.

Chainsaw Components Overview

Key parts of a typical Husqvarna chainsaw.

1. Engine: Two-stroke air-cooled engine with cylinder displacement varying by model.
2. Guide Bar: Length determines cutting capacity; types include laminated, solid, and replaceable nose.
3. Cutting Chain: Pitch, gauge, and drive link count must match bar and sprocket.
4. Clutch: Centrifugal clutch engages chain at certain RPM.
5. Chain Brake: Stops chain instantly upon kickback or manual activation.
6. Carburetor: Adjusts fuel/air mixture; has H (high), L (low), and T (idle) screws.
7. Air Filter: Prevents debris from entering engine; requires regular cleaning.
8. Spark Plug: Ignites fuel mixture; standard gap typically 0.020-0.025 inches.
9. Fuel Tank: Holds gasoline/oil mixture; separate oil tank for bar lubrication.
10. Handle/Vibration Dampeners: Reduce operator fatigue.

WARNING! Always disconnect spark plug wire before performing any repairs to prevent accidental starting.

Routine Maintenance

Daily and periodic maintenance tasks to ensure optimal performance and longevity.

1. Daily Checks: Chain tension, sharpness, bar condition, lubrication, air filter cleanliness.
2. Weekly Tasks: Clean cooling fins, check spark plug, inspect fuel lines for cracks.
3. Monthly Tasks: Clean carburetor air passage, check clutch and sprocket wear, inspect anti-vibration elements.
4. Seasonal: Replace fuel filter, clean/replace spark arrestor screen, check all nuts/bolts for tightness.

CAUTION! Use only Husqvarna-approved replacement parts and lubricants.

Specifications

• Engine Type: Two-stroke, single cylinder, air-cooled.
• Displacement: Ranges from 38cc to 120cc across models.
• Power Output: Varies by model (e.g., 2.5 HP to 7.0 HP).
• Fuel: Unleaded gasoline (min 89 octane) mixed with 2-stroke oil at 50:1 ratio (for most newer models).
• Bar Lengths: 12" to 36" depending on model and application.
• Chain Pitch/Gauge: Common: 0.325", 3/8", 0.404" pitch; 0.050", 0.058", 0.063" gauge.
• Ignition: Electronic, capacitor discharge (CDI).
• Weight: 9.5 lbs to 20 lbs (powerhead only).
• Sound Level: Typically 105-115 dB(A) at operator's ear.

Engine System Repair

Diagnosis and repair procedures for engine-related issues.

Cylinder/Piston: Inspect for scoring; replace if deep scratches present. Check ring end gap.

Crankshaft/Seals: Check for play; replace crankcase seals if leaking (air leak causes lean run).

Muffler/Spark Arrestor: Clean carbon deposits regularly; replace if damaged.

Compression Test: Should read 120-150 PSI (varies by model). Low compression indicates worn piston/rings.

Decompression Valve: Test for leakage; replace if engine is hard to start.

Cutting System Repair

Maintenance and repair of bar, chain, and drive components.

1. Bar Maintenance: Clean bar groove; flip bar regularly for even wear; check for bent rails or worn nose.
2. Chain Sharpening: File at correct angle (typically 30°); maintain equal length on all cutters; check depth gauges.
3. Sprocket Inspection: Replace if teeth are hooked or worn; rim sprockets are easier to replace than spur.
4. Clutch Assembly: Inspect shoes for wear; clean centrifugal clutch drum; replace if slipping.
5. Oil Pump: Test output; adjust if necessary; clean oil passages in bar.

Tip: Always match chain pitch and gauge to bar and sprocket specifications.

Fuel System Service

Carburetor adjustment, cleaning, and fuel line replacement.

1. Carburetor Adjustment (standard): Initial settings: L screw 1 turn open, H screw 1 turn open, T screw 1 turn open.
2. Fine Tuning: Warm up engine. Adjust L for smooth idle; adjust H for maximum RPM (do not exceed max RPM).
3. Carburetor Cleaning: Disassemble; soak in carb cleaner; blow out passages with compressed air; replace diaphragm/gaskets.
4. Fuel Lines: Replace if cracked or hardened; ensure proper routing to avoid kinks.
5. Fuel Filter: Replace annually or if clogged; located inside fuel tank.
6. Impulse Line: Check for cracks; connects carburetor to crankcase for pump operation.

WARNING! Never run engine lean (insufficient fuel); causes overheating and engine seizure.

Ignition System Service

Spark plug, ignition coil, and switch testing.

Spark Plug: Replace annually; gap to 0.020". Use recommended type (e.g., NGK BPMR7A).

Ignition Coil: Check primary resistance (approx. 0.2-2.0 Ω) and secondary resistance (approx. 5k-15k Ω).

Stop Switch: Test for continuity; should open circuit when pressed.

Flywheel: Check for sheared key if timing is off; clean magnets.

Air Gap: Set between flywheel and coil legs (typically 0.010-0.012").

Storage & Care

Proper storage procedures for off-season or extended non-use.

1. Empty fuel tank or add fuel stabilizer; run engine 2 minutes to distribute.
2. Drain bar oil tank or fill with fresh oil to prevent sludge.
3. Remove chain, clean in solvent, dry, and coat with oil.
4. Clean entire saw; check for loose/missing parts.
5. Store in dry, cool place; cover to keep dust-free.

CAUTION! Never store with fuel in carburetor for more than 30 days; causes varnish and clogging.

Warranty Information

Husqvarna offers limited warranty for residential and commercial use. Warranty period varies by model and region (typically 1-2 years for consumer, 90 days for commercial). Proof of purchase required. Warranty does not cover normal wear, misuse, improper fuel, or unauthorized repairs. For warranty claims, contact authorized Husqvarna service dealer. Keep this manual as proof of proper maintenance.

Troubleshooting Guide

Reset: For electronic ignition models, disconnect spark plug wire for 30 seconds to reset module if overheated.

Service: For technical support, contact Husqvarna at 1-800-487-5962 or visit www.husqvarna.com.