Husqvarna FS 400 LV Manual

The Husqvarna FS 400 LV is a professional-grade, low-vibration clearing saw designed for demanding vegetation management. It features a powerful 40.9cc X-Torq engine for reduced emissions and fuel consumption, a robust cutting head, and an advanced anti-vibration system for operator comfort. Below are key sections covering safety, features, operation, maintenance, and troubleshooting.

1. Features at a Glance 2. Safety Information 3. Assembly & Installation 4. Specifications 5. Controls and Components 6. Operation 7. Maintenance Schedule 8. Cutting Equipment 9. Storage 10. Regulatory Information 11. Troubleshooting

Features at a Glance

Key components: X-Torq engine, LowVib anti-vibration system, Ergonomic harness, Quick-release cutting head, Air Purge system, and Smart Start.

Feature	Description
X-Torq Engine	Reduces fuel consumption and exhaust emissions
LowVib System	Dampens vibrations for reduced operator fatigue
Air Purge	Removes air from fuel system for easier starting
Smart Start	Reduces resistance in starter cord
Quick-release	Fast cutting head attachment and removal
Ergonomic Harness	Distributes weight for comfortable operation
Throttle lockout	Prevents accidental throttle engagement
Stop Switch	Immediately stops engine
Fuel Tank	0.95 liter capacity
Cutting Head	Accepts various blades and trimmer heads

Safety Information

Read and understand all instructions before use. Always wear appropriate PPE.

Personal Protective Equipment: Wear safety glasses, hearing protection, gloves, sturdy boots, and protective trousers.
Work Area Safety: Clear area of bystanders, especially children and pets. Be aware of hidden obstacles.
Fuel Safety: Refuel outdoors with engine off and cool. Use clean, fresh fuel mix (2-stroke oil and gasoline).
Operation Safety: Hold saw firmly with both hands. Never operate above shoulder height or on unstable surfaces.

WARNING! Risk of serious injury or death from blade contact or thrown objects. Maintain a safe distance.

Assembly & Installation

Assemble the clearing saw according to the provided instructions.

Attach handle: Secure the loop handle to the shaft using provided bolts and tools.
Install harness: Adjust harness straps for a comfortable, balanced fit.
Mount cutting head: Align and lock the cutting head onto the drive shaft.
Fuel mix: Prepare correct 2-stroke oil and gasoline mixture (refer to Specifications).

CAUTION! Ensure all fasteners are tightened securely before operation.

Specifications

Engine Type: 2-stroke, single cylinder, air-cooled.
Displacement: 40.9 cc.
Power Output: 1.8 kW (2.4 hp).
Fuel/Oil Ratio: 50:1 (Husqvarna 2-stroke oil recommended).
Fuel Tank Volume: 0.95 liters.
Sound Pressure Level: Typically 100 dB(A).
Vibration Level: Front handle: 3.2 m/s², Rear handle: 4.5 m/s².
Weight (without cutting equipment): 6.7 kg.
Recommended Cutting Equipment: Metal blades, trimmer heads, brush knives.

Controls and Components

Main components: Throttle trigger, Throttle lockout, Stop switch, Choke control, Primer bulb, Fuel cap, and Air filter cover.

Operation Controls: Throttle trigger (speed control), Throttle lockout (must be pressed to engage throttle), Stop switch (stops engine), Choke (for cold starts).

Maintenance Points: Air filter (clean regularly), Spark plug (check gap), Fuel filter (in tank), Cutting equipment attachment point.

Operation

Starting, running, and stopping procedures.

Starting Cold Engine: Set stop switch to ON. Press primer bulb 6 times. Set choke to closed. Pull starter cord until engine fires. Set choke to open. Pull cord to start.
Starting Warm Engine: Follow above but do not use choke or primer.
Running: Allow engine to warm up at idle. Use harness for support. Swing saw in a controlled arc from right to left.
Stopping: Release throttle. Let engine idle briefly. Press stop switch.

Tip: Keep the cutting head parallel to the ground for even cutting.

Maintenance Schedule

Regular maintenance ensures performance and longevity.

Interval	Task
Daily	Check for loose parts, clean air filter, inspect cutting equipment.
Weekly	Clean cooling fins, check spark plug condition.
Monthly	Clean fuel filter, check fuel lines, inspect vibration dampeners.
Seasonally	Replace spark plug, clean carburetor (if needed), check clutch.

WARNING! Always disconnect spark plug wire before performing maintenance.

Cutting Equipment

Supports various blades and trimmer heads for different vegetation.

Metal Blades: For thick brush and small saplings. Ensure blade is sharp and balanced.
Trimmer Heads: For grass and light weeds. Use correct line diameter.
Brush Knives: For heavy weeds and brambles.
Installation: Ensure engine is off. Use correct guard for the chosen equipment.

CAUTION! Always use the appropriate guard. Never use damaged cutting equipment.

Storage

Prepare the saw for short or long-term storage.

Short-term: Clean exterior, store in a dry place.
Long-term: Drain fuel tank and run carburetor dry. Remove spark plug, add a few drops of oil into cylinder, and pull starter cord slowly. Store in a dry, frost-free location.

CAUTION! Fuel left in the carburetor can cause starting problems.

Regulatory Information

Complies with relevant machinery directives and emission standards. The CE mark indicates conformity with European health, safety, and environmental requirements. Noise and vibration values are measured according to standardized test methods. For genuine spare parts and accessories, contact an authorized Husqvarna dealer. For support, visit www.husqvarna.com or contact your local dealer.

Troubleshooting

Symptom	Possible Cause	Corrective Action
Engine will not start	No fuel, flooded, spark plug	Check fuel level, dry spark plug, check for spark.
Engine runs poorly	Dirty air/fuel filter, carburetor	Clean or replace air/fuel filter, adjust carburetor.
Excessive vibration	Unbalanced blade, loose parts	Balance or replace blade, tighten all fasteners.
Loss of power	Clogged exhaust, worn piston	Clean exhaust port, inspect cylinder/piston.
Cutting head does not rotate	Drive shaft, clutch	Check drive shaft connection, inspect clutch.

Service: For repairs beyond basic maintenance, contact an authorized Husqvarna service center.

Dealer Locator: www.husqvarna.com