Husqvarna 120 iH4 Manual

The Husqvarna 120 iH4 is a lightweight, battery-powered hedge trimmer designed for residential use. It features the iH4 battery system, a 24-inch double-sided laser-cut blade, Smart Start technology for easy starting, an ergonomic design with soft-grip handles, low vibration, and an automatic oiler. Below are key sections for safety, features, assembly, operation, maintenance, and troubleshooting.

Features at a Glance

Key components: 24-inch double-sided laser-cut blade, iH4 Lithium-ion battery, Battery Charger, Front Hand Guard, Rear Handle with Trigger, Blade Guard.

Feature	Description
24-inch Laser-Cut Blade	Double-sided, low-friction coating for efficient cutting
iH4 Battery System	40V Lithium-ion battery, compatible with iH4 series
Smart Start	Easy start system with minimal resistance
Ergonomic Design	Soft-grip front and rear handles, balanced weight
Low Vibration	Reduced vibration for less user fatigue
Automatic Oiler	Lubricates blade automatically during operation
Blade Guard	Protective cover for safe storage and transport
Battery Fuel Gauge	LED indicator shows remaining charge
Lock-off Button	Prevents accidental start-up
Weight	Lightweight design (approx. 6.6 lbs without battery)

Safety Instructions

Read all instructions before use. Wear appropriate safety gear.

1. Personal Protective Equipment: Always wear safety glasses, hearing protection, gloves, long pants, and non-slip boots.
2. Work Area Safety: Keep bystanders and pets at least 50 feet away. Ensure stable footing.
3. Tool Inspection: Check for damage before each use. Do not use if damaged.
4. Electrical Safety: Keep away from rain, wet conditions, and power lines.
5. Hand Placement: Keep hands away from cutting blade. Always use both hands.

WARNING! Risk of serious injury or death. Do not operate without proper training and safety gear. Keep hands and feet clear of blade.

Assembly & Preparation

Unpack and inspect all parts. Assemble before first use.

1. Attach Blade Guard: Remove guard from packaging; slide onto blade when not in use.
2. Install Battery: Insert iH4 battery into battery compartment until it clicks.
3. Charge Battery: Use included charger; connect to power outlet. Charge fully before first use (approx. 60 minutes).
4. Fill Oil Reservoir: Use Husqvarna chain and bar oil. Remove cap, fill to level, replace cap securely.
5. Test Controls: Ensure lock-off button, trigger, and safety functions work properly.

CAUTION! Ensure battery is fully charged and oil reservoir is filled before operation.

Specifications

• Model: Husqvarna 120 iH4
• Power Source: 40V iH4 Lithium-ion battery
• Blade Length: 24 inches (61 cm)
• Cutting Teeth: Double-sided, 3/4 inch tooth spacing
• Voltage: 40V DC
• Weight (without battery): 6.6 lbs (3.0 kg)
• Sound Power Level: < 85 dB(A)
• Vibration Level: < 2.5 m/s²
• Battery Charging Time: Approx. 60 minutes (standard charger)
• Run Time: Up to 60 minutes per charge (varies with use)

Controls and Components

Main components: Rear Handle with Trigger, Front Handle, Lock-off Button, Battery Compartment, Blade, Oil Filler Cap, Battery Fuel Gauge.

Operation Controls: Lock-off Button (must be pressed before trigger), Trigger (start/stop), Battery Release Button. Safety Features: Hand Guard, Blade Guard, Low-Kickback Design.

Battery: LED indicators show charge level (4 LEDs = full, 1 LED = low). Charger: LED indicates charging (red) and fully charged (green).

Operation

Proper technique ensures efficient cutting and safety.

1. Pre-Operation Check: Ensure battery is charged, oil reservoir filled, blade clean and sharp.
2. Starting: Press lock-off button, then squeeze trigger. Release trigger to stop.
3. Cutting Technique: Hold trimmer with both hands. Use smooth, sweeping motions. Cut from bottom to top for best results.
4. Battery Monitoring: Watch battery fuel gauge. Replace battery when 1 LED remains.
5. Stopping: Release trigger. Engage lock-off button. Remove battery for storage.

Tip: For thick branches, use slower cutting speed. Avoid forcing the blade.

Battery & Charging

The iH4 battery system provides cordless convenience.

1. Charging: Use only Husqvarna iH4 charger. Connect charger to power outlet, then insert battery.
2. Charging Indicators: Red LED = charging; Green LED = fully charged.
3. Battery Care: Store in cool, dry place. Avoid extreme temperatures. Do not disassemble.
4. Run Time: Up to 60 minutes under normal conditions. Heavy use reduces run time.
5. Battery Life: Approximately 500 charge cycles with proper care.

WARNING! Use only Husqvarna iH4 batteries and charger. Risk of fire or explosion if using incompatible components.

Maintenance

Regular maintenance ensures optimal performance and longevity.

1. After Each Use: Clean debris from blade and housing. Check for damage.
2. Blade Sharpening: Have blade professionally sharpened when cutting efficiency decreases.
3. Oiling: Check oil level before each use. Refill with Husqvarna chain and bar oil.
4. Bolt Tightening: Periodically check and tighten blade mounting bolts.
5. Battery Contacts: Keep clean and dry. Wipe with dry cloth if dirty.

CAUTION! Always remove battery before performing any maintenance. Wear gloves when handling blade.

Storage

Proper storage extends tool life.

1. Clean Thoroughly: Remove all plant debris from blade and housing.
2. Apply Protective Oil: Lightly coat blade with oil to prevent rust.
3. Attach Blade Guard: Secure guard over cutting blade.
4. Battery Storage: Store battery separately in cool, dry place (50-77°F / 10-25°C).
5. Location: Store in dry, locked area out of reach of children.

Tip: Store battery with 40-60% charge if not using for extended periods.

Regulatory Information

CE Certified: Complies with European safety standards. RoHS Compliant: Free of hazardous substances. Waste Electrical and Electronic Equipment (WEEE): Do not dispose with household waste. Recycle according to local regulations. Copyright © 2025 Husqvarna AB. Husqvarna is a registered trademark. For support, visit www.husqvarna.com or contact 1-800-487-5962.

Troubleshooting

Symptom	Possible Cause	Corrective Action
Trimmer will not start	Battery dead/not installed	Charge battery; ensure fully inserted; check lock-off button.
Reduced cutting power	Dull blade/low battery	Sharpen blade; charge battery; check for debris.
Blade not oiling	Empty oil reservoir/clog	Fill oil reservoir; clean oil ports; check automatic oiler.
Battery not charging	Faulty charger/connections	Check power outlet; clean battery contacts; try different charger.
Excessive vibration	Loose blade/damage	Tighten blade bolts; inspect for damage; replace if necessary.

Service: For repairs, contact authorized Husqvarna service center. Do not attempt to repair battery or electrical components.

Support: 1-800-487-5962; www.husqvarna.com