Husqvarna 359 Chainsaw Service Manual

The Husqvarna 359 is a professional-grade chainsaw featuring a 59cc X-Torq engine for reduced emissions and fuel consumption, an air injection system for cleaner air filters, combined choke/stop control, inertia-activated chain brake, Smart Start for easier starting, and low vibration. This manual provides detailed service, maintenance, and repair procedures for technicians and experienced users. Below are key sections for safety, specifications, maintenance, troubleshooting, and repair.

1. Features at a Glance 2. Safety Information 3. Technical Specifications 4. Maintenance Schedule 5. Engine Service 6. Fuel System 7. Ignition System 8. Chain & Bar Maintenance 9. Carburetor Adjustment 10. Troubleshooting 11. Parts List & Diagrams

Features at a Glance

Key components: X-Torq engine, Air Injection, Combined choke/stop control, Inertia chain brake, Smart Start, LowVib anti-vibration system, Side-mounted chain tensioner.

Feature	Description
Engine Type	2-stroke, single cylinder, X-Torq technology
Displacement	59 cm³ (3.6 cu.in.)
Power Output	3.4 kW (4.6 hp)
Fuel Tank Volume	0.77 L (0.20 US gal)
Oil Tank Volume	0.38 L (0.10 US gal)
Recommended Bar Length	40-50 cm (16"-20")
Chain Pitch	3/8" or .325"
Ignition System	Electronic, SEM or similar
Weight (without bar & chain)	5.9 kg (13.0 lbs)
Sound Pressure Level	Approx. 114 dB(A)

Safety Information

Always wear protective equipment: helmet, goggles, hearing protection, gloves, chainsaw chaps, and steel-toed boots.

Pre-Operation Check: Inspect chain brake, throttle lock, chain tension, and sharpness.
Fueling: Use fresh fuel mix (50:1 Husqvarna XP+ oil). Refuel in well-ventilated area, engine off and cool.
Starting: Place on ground, engage chain brake, use proper starting procedure.
Operation: Maintain secure grip, be aware of kickback zone, never cut above shoulder height.

WARNING! Chainsaw operation is dangerous. Improper use can cause serious injury or death. Read and understand the operator's manual before use.

Technical Specifications

Engine Model: Husqvarna 359.
Cylinder Bore: 45 mm (1.77 in).
Piston Stroke: 37 mm (1.46 in).
Compression Ratio: Approx. 9.5:1.
Spark Plug: Champion RCJ7Y or equivalent, gap 0.5 mm (0.020").
Carburetor: Walbro HDA or Zama C1M, adjustable H, L, and T screws.
Idle Speed: 2700 ± 150 RPM.
Maximum Power Speed: 9600 RPM.
Chain Oil: Use biodegradable chain oil or equivalent.
Fuel Mix: Unleaded gasoline (min 90 octane) with 2% high-quality 2-stroke oil (50:1).

Maintenance Schedule

Access daily and periodic maintenance tasks. Front Panel: Chain brake test, chain tension, air filter cleaning.

Daily/Before Use: Check chain tension/sharpness, chain brake function, fuel/oil levels, air filter, external screws/nuts.

Weekly/Every 10 Hours: Clean air filter (more often in dusty conditions), check spark plug, clean cooling fins, inspect spark arrestor screen.

Monthly/Every 20 Hours: Clean fuel filter, check carburetor settings, inspect anti-vibration elements, clean cylinder fins.

Yearly/Every 100 Hours: Replace fuel filter, check fuel lines, clean carburetor, check clutch and sprocket wear.

Engine Service

Cylinder & Piston: Remove muffler to inspect piston through exhaust port. Scoring indicates air filter or carburetor issues.

Disconnect spark plug wire.
Remove engine cover and air filter housing.
Remove cylinder cover and muffler.
Unbolt cylinder, inspect piston rings and cylinder walls.
Reassemble with new gaskets, torque bolts to spec (cylinder bolts: 10 Nm).

Tip: Always use a torque wrench. Clean all parts before reassembly.

Fuel System

Includes fuel tank, lines, filter, and carburetor.

Fuel Filter: Remove tank cap and filter; replace if clogged.
Fuel Lines: Inspect for cracks; replace if hardened or leaking.
Carburetor: Remove, clean jets and diaphragms; check gaskets.
Fuel Cap: Ensure vent is clear.

WARNING! Fuel is highly flammable. Work in well-ventilated area, away from sparks or open flame.

Ignition System

Electronic ignition module, spark plug, and stop switch.

Spark Plug: Remove, check electrode gap (0.5 mm), clean or replace.
Ignition Module: Check air gap (0.2-0.4 mm) between flywheel and module.
Stop Switch: Test continuity; replace if faulty.
Flywheel Key: Inspect for shearing; replace if damaged.

CAUTION! Disconnect spark plug wire before any service to prevent accidental starting.

Chain & Bar Maintenance

Supports .325" or 3/8" pitch chains, recommended bar lengths 16"-20".

Chain Tension: Adjust with side tensioner when chain is cool. Proper tension: snug against bar but pullable by hand.
Sharpening: Use correct round file size (.325": 4.0 mm, 3/8": 4.8 mm). Maintain 30° cutting angle, 10° top plate angle.
Bar Maintenance: Clean bar groove, flip bar regularly for even wear, check for burrs and file smooth.
Sprocket: Inspect clutch drum sprocket; replace if worn (spur or rim type).

WARNING! Always wear gloves when handling chain. Ensure chain brake is engaged during maintenance.

Carburetor Adjustment

Adjust H (high), L (low), and T (idle) screws. Initial settings: L=1 turn out, H=1 turn out from lightly seated.

Troubleshooting

Symptom	Possible Cause	Corrective Action
Engine won't start	No spark, flooded, fuel issue	Check spark plug, ignition gap; dry plug; check fuel lines/filter.
Engine starts then dies	Clogged fuel filter, carburetor	Replace fuel filter; clean carburetor jets; check fuel tank vent.
Poor performance/loss of power	Dirty air filter, clogged spark arrestor, carb adjustment	Clean air filter; clean spark arrestor screen; adjust carburetor.
Chain doesn't turn	Clutch worn, sprocket, brake engaged	Inspect clutch shoes/springs; check sprocket; disengage chain brake.
Excessive vibration	Loose parts, worn anti-vibration mounts	Tighten all bolts; inspect and replace anti-vibration elements.
Chain oil not flowing	Clogged oil passages, pump issue	Clean oil holes in bar; check oil pump drive and lines.

Reset: For electronic issues, disconnect spark plug wire for 1 minute to reset ignition module.

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

Parts List & Diagrams

Refer to official Husqvarna 359 IPL (Illustrated Parts List) for part numbers and exploded views. Common replacement parts: Air filter (#503 92 96-01), Spark plug (#501 84 52-01), Fuel filter (#501 84 65-01), Carburetor kit (#530 03 53-25), Clutch assembly (#537 28 40-01).

CAUTION! Use only genuine Husqvarna parts to ensure safety, performance, and warranty compliance.