Husqvarna 350 Service Manual

The Husqvarna 350 is a professional-grade chainsaw designed for demanding forestry and arborist work. This service manual provides detailed instructions for maintenance, troubleshooting, and repair of the Husqvarna 350 chainsaw, including its X-Torq engine technology, fuel system, ignition system, cutting equipment, safety features, and routine service procedures. Below are key sections covering safety, specifications, maintenance schedules, disassembly, repair, and troubleshooting.

Features at a Glance

Key components: X-Torq engine for reduced emissions, Air Injection air cleaning system, Combined choke/stop control, Inertia activated chain brake, Side-mounted chain tensioner, Quick-release air filter.

Safety Information

Always prioritize safety when servicing the Husqvarna 350 chainsaw.

1. Disconnect spark plug: Before any service, remove spark plug cap to prevent accidental starting.
2. Use proper tools: Employ Husqvarna recommended tools for safe and effective service.
3. Work in clean area: Ensure workspace is clean, dry, and well-lit.
4. Handle fuel safely: Drain fuel tank in well-ventilated area away from sparks or flames.
5. Wear protective gear: Use safety glasses, gloves, and appropriate clothing.

WARNING! The chainsaw can cause serious injury or death. Never attempt repairs without proper training and tools. Always refer to official Husqvarna documentation.

Specifications

• Engine: 2-stroke, single cylinder, X-Torq, 50.1 cm³.
• Power: 2.4 kW at 9,000 rpm.
• Max Power Speed: 9,000 rpm.
• Idle Speed: 2,700 rpm.
• Fuel/Oil Ratio: 50:1 (Husqvarna XP+ or equivalent 2-stroke oil).
• Spark Plug: Champion RCJ7Y or NGK BPMR7A, gap 0.5 mm (0.020").
• Ignition Air Gap:0.3 mm (0.012") CarburetorZama C1Q or Walbro, adjustable H, L, T screws Chain BrakeInertia activated, manual release Chain Oil PumpAutomatic, adjustable flow rate

  Maintenance Schedule

  Regular maintenance ensures optimal performance and longevity.

  Interval	Service Task
  Daily/Before Use	Check chain tension, sharpness, and lubrication; inspect for loose parts; clean air filter.
  Every 10 hours	Clean spark arrestor screen (if equipped); check fuel filter.
  Every 20 hours	Replace air filter; clean cooling fins; inspect spark plug.
  Every 50 hours	Replace fuel filter; clean carburetor; check clutch and sprocket.
  Every 100 hours	Replace spark plug; clean exhaust port; check anti-vibration mounts.
  Annually/Seasonally	Drain and replace fuel; inspect all cables and handles; full service check.

  Note: Service intervals may vary based on operating conditions and intensity of use.

  Engine System

  X-Torq engine reduces fuel consumption and emissions.

  1. Cylinder and Piston: Inspect for scoring, carbon buildup, and ring wear.
  2. Crankcase: Check seals and bearings for leaks or wear.
  3. Cooling System: Ensure fins are clean; fan intact.
  4. Compression Test: Should be 120-150 psi (8.3-10.3 bar) for healthy engine.

  Service Tip: Use a piston stop when removing clutch or flywheel to prevent engine rotation.

  Fuel System

  Includes tank, filter, lines, and carburetor.

  1. Fuel Tank: Inspect for cracks; clean sediment.
  2. Fuel Filter: Replace if clogged; located inside tank.
  3. Fuel Lines: Check for cracks, stiffness, or leaks; replace as needed.
  4. Carburetor: Clean with compressed air; adjust H (high), L (low), T (idle) screws.
  5. Default Settings: L: 1 turn out; H: 1 turn out; T: 1-1.5 turns out (fine-tune for performance).

  WARNING! Use only fresh, properly mixed fuel (50:1). Stale fuel is a common cause of starting and running issues.

  Ignition System

  Electronic ignition module and spark plug.

  1. Spark Plug: Check electrode gap (0.5 mm); replace if fouled or worn.
  2. Ignition Module: Test with multimeter; resistance values vary by model.
  3. Stop Switch: Ensure wire is intact and functional.
  4. Air Gap: Adjust flywheel to coil gap to 0.3 mm (0.012").

  Tip: A weak spark is often due to a faulty ignition coil or damaged flywheel magnets.

  Cutting Equipment

  Guide bar, chain, sprocket, and clutch.

  1. Guide Bar: Inspect for wear, straightness, and groove condition; rotate regularly.
  2. Chain: Sharpen regularly; check for damaged or worn cutters and drive links.
  3. Sprocket: Replace if worn (clutch drum sprocket).
  4. Clutch: Inspect shoes for wear; springs for tension.
  5. Chain Brake: Test function; clean and lubricate mechanism.
  6. Oil Pump: Adjust flow via screw; ensure passages are clear.

  CAUTION! Always use matching pitch for bar, chain, and sprocket. Mismatched components cause rapid wear and can be dangerous.

  Disassembly & Assembly

  General procedure for major components.

  1. Remove top cover: Unscrew fasteners; disconnect choke linkage if needed.
  2. Remove starter assembly: Note spring orientation for reassembly.
  3. Remove clutch: Use clutch tool and piston stop; left-hand thread.
  4. Remove flywheel: Use puller; do not hammer.
  5. Separate crankcase halves: Requires case splitter tool; mark halves for alignment.

  Note: Torque fasteners to specification during reassembly. Use thread locker where specified.

  Troubleshooting

  Symptom	Possible Cause	Corrective Action
  Engine will not start	No spark, fuel issue, flooded	Check spark plug, fuel freshness, carburetor settings; clear flood.
  Engine starts then dies	Fuel filter clogged, carburetor adjustment	Replace fuel filter; adjust L screw; clean carburetor.
  Lacks power under load	Clogged air filter, exhaust screen, carb H setting	Clean/replace air filter; clean spark arrestor; adjust H screw.
  Chain does not oil	Oil pump, lines, or bar holes clogged	Clean oil passages; check pump function; adjust flow screw.
  Excessive vibration	Loose parts, worn anti-vibration mounts	Tighten all fasteners; inspect and replace mounts.
  Chain brake not engaging	Mechanism dirty or damaged	Clean and lubricate; replace band or springs if worn.

  Reset: For electronic issues, disconnect spark plug and reconnect after 1 minute.

  Service: For genuine parts and technical support, contact Husqvarna authorized dealer or visit www.husqvarna.com.

  Parts List

  Key replacement part numbers (consult official IPL for complete list).

  • Air Filter: Husqvarna Part # 503 49 08-01
  • Spark Plug: Champion RCJ7Y or NGK BPMR7A
  • Fuel Filter: Husqvarna Part # 501 84 75-02
  • Carburetor Kit: Zama C1Q-D10 (if applicable)
  • Clutch Assembly: Husqvarna Part # 537 00 43-01
  • Chain Brake Band: Husqvarna Part # 501 87 41-01
  • Ignition Coil: Husqvarna Part # 544 01 14-01
  • Anti-Vibration Mount Set: Husqvarna Part # 537 23 40-01

  Note: Part numbers are subject to change. Always verify with your serial number and latest parts list.

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