Husqvarna Chainsaw Workshop Manual 359

The Husqvarna Chainsaw Model 359 is a professional-grade chainsaw designed for demanding forestry and arborist work. This workshop manual provides comprehensive technical information for service, maintenance, and repair. It covers the 359cc engine, fuel system, ignition, chain brake, cutting equipment, and all major assemblies. Below are key sections for specifications, safety, disassembly, troubleshooting, and parts identification.

Specifications & Technical Data

Key technical specifications for the Husqvarna 359 chainsaw.

Safety Information

Critical safety warnings and procedures for workshop personnel.

1. Personal Protective Equipment (PPE): Always wear safety glasses, gloves, and hearing protection when servicing.
2. Fuel Safety: Work in a well-ventilated area. No smoking or open flames. Use approved fuel containers.
3. Chain & Bar: Ensure the chain brake is engaged and the spark plug wire is disconnected before handling the cutting equipment.
4. Sharp Edges: Be cautious of sharp cutters and sprocket teeth.
5. Lifting: Use proper lifting techniques; the powerhead is heavy.

WARNING! Failure to follow safety procedures can result in serious injury or death. Always refer to the operator's manual for user safety.

Tools & Workshop Requirements

Specialized tools required for servicing the Husqvarna 359.

1. Husqvarna Combination Wrench (for spark plug and cylinder nuts)
2. Piston Stop Tool (Part # 502 50 41-01)
3. Flywheel Puller (Part # 502 77 94-01)
4. Clutch Drum Holding Tool
5. Pressure/Vacuum Tester for crankcase
6. Torque Wrench (range 2-30 Nm)
7. Carburetor Adjustment Tool (Splined)
8. Feeler Gauges for ignition air gap

NOTE: Using incorrect tools can damage components. Always use Husqvarna Genuine Tools or equivalents.

Engine System

Procedures for cylinder, piston, crankshaft, and bearings.

• Cylinder & Piston Inspection: Check for scoring, carbon buildup, and ring wear. Measure piston clearance.
• Crankshaft & Main Bearings: Check for play and smooth rotation. Replace if axial/radial play exceeds specifications.
• Decompression Valve: Test for proper sealing and spring function.
• Muffler & Spark Arrestor: Clean regularly. Remove carbon deposits from muffler interior and screen.
• Torque Specifications: Cylinder nuts: 10-12 Nm. Spark plug: 25-30 Nm.

Fuel & Carburetor System

Service of fuel lines, filter, tank, and carburetor adjustment.

1. Fuel System Pressure Test: Check for leaks in fuel lines, tank, and carburetor diaphragms.
2. Carburetor Adjustment (H/L/T): Initial settings: L=1 turn out, H=1 turn out, T=1-1.5 turns out. Final tune with tachometer (max 13,500 rpm no-load).
3. Fuel Filter Replacement: Replace annually or more frequently in dirty conditions.
4. Impulse Line: Inspect for cracks or leaks; ensures carburetor pump function.

Tip: Always use fresh, high-quality 2-stroke oil mixed at 50:1 ratio with 89+ octane gasoline.

Ignition & Electrical System

Testing and replacement of ignition module, spark plug, and stop switch.

Ignition Module (SEM): Check air gap (0.25-0.30 mm). Test with multimeter for primary/secondary coil resistance (specs: Primary ~0.3 Ω, Secondary ~5 kΩ).

Spark Plug: Correct gap is 0.5 mm (0.020"). Replace if electrodes are worn or ceramic is cracked.

Stop Switch: Test for continuity. The switch should break the circuit when engaged.

Wiring Harness: Inspect for frayed wires, especially near the handle and trigger.

Chain Brake & Clutch Assembly

Disassembly, inspection, and reassembly of the safety clutch and chain brake mechanism.

1. Remove clutch cover, bar, and chain.
2. Use clutch holding tool to remove clutch (left-hand thread).
3. Inspect clutch shoes for wear and springs for fatigue.
4. Test chain brake band and mechanism for free movement and return. Replace band if worn thin.
5. Lubricate pivot points of the brake handle and inertia mechanism.

CAUTION! The clutch spring is under tension. Wear eye protection during removal.

Cutting Equipment & Bar Maintenance

Maintenance of guide bar, chain, sprocket, and oiling system.

1. Guide Bar: Clean bar groove regularly. Flip bar weekly for even wear. Dress rails with a flat file if burred.
2. Sprocket (Spur or Rim): Check for hooking or wear. Replace rim sprocket and bearing as a set.
3. Chain Oiling System: Check oil pump output and adjust if necessary. Clean oil passages in bar and tank.
4. Chain Sharpening: Maintain correct filing angles (30° cutter, 10° top plate). Maintain consistent depth gauge height.

WARNING! A dull or damaged chain increases kickback risk and operator fatigue.

Disassembly & Reassembly Procedures

Step-by-step guide for major component removal.

1. Separating Handle from Powerhead: Remove screws, disconnect throttle linkage and wires.
2. Cylinder Removal: Remove muffler, decomp valve, and cylinder nuts. Use piston stop to hold crankshaft.
3. Crankshaft Replacement: Requires splitting the crankcase. Heat the crankcase halves evenly.
4. Reassembly Tips: Use new gaskets and seals. Apply thread locker to clutch threads. Pressure test crankcase after reassembly.

NOTE: Take photos during disassembly to aid reassembly. Organize screws and parts.

Troubleshooting & Diagnostics

Systematic Approach: Always diagnose from simplest to most complex cause (Fuel, Spark, Compression).

Parts Diagrams & Ordering

Reference exploded-view diagrams for part numbers and assembly relationships.

• Engine Assembly (Group 10): Piston, cylinder, crankshaft, bearings, seals.
• Carburetor & Fuel (Group 20): Carburetor, fuel lines, filter, tank.
• Ignition (Group 30): Ignition module, flywheel, spark plug, stop switch.
• Clutch & Chain Brake (Group 40): Clutch, drum, brake band, handle, springs.
• Cutting Equipment (Group 50): Guide bar, chain, sprocket, cover, tensioner.
• External Parts (Group 60): Handles, antivibration mounts, covers, decals.

Ordering: Use the full part number from the diagram. Contact an authorized Husqvarna dealer or visit www.husqvarna.com for parts.

Service Support: For technical assistance, contact Husqvarna Technical Support at 1-800-487-5962.