Stihl HL75 Manual

The Stihl HL75 is a professional-grade hedge trimmer designed for demanding trimming and shaping tasks. It features a powerful engine, lightweight construction, double-sided cutting blades, anti-vibration system, easy-start technology, ergonomic handles, and automatic chain oiling. Below are key sections for safety, features, operation, maintenance, troubleshooting, and specifications.

Features at a Glance

Key components: Engine unit, cutting blade, handle assembly, fuel tank, oil tank, throttle trigger, and safety features.

Feature	Description
Engine Type	2-stroke gasoline engine
Cutting Length	75 cm (30 inches) double-sided blade
Anti-Vibration System	Reduces operator fatigue during extended use
Easy-Start System	Simplifies starting procedure
Automatic Oiling	Continuous lubrication of cutting blade
Ergonomic Handles	D-loop handle and front handle for control
Safety Features	Throttle trigger lockout, hand guard
Fuel Tank Capacity	0.55 liters
Oil Tank Capacity	0.26 liters
Weight (without fuel)	5.2 kg

Safety Instructions

Read all instructions before operation. Wear appropriate PPE.

1. Personal Protective Equipment: Wear safety glasses, hearing protection, gloves, sturdy boots, and close-fitting clothing.
2. Work Area Safety: Keep bystanders and pets at least 15 meters away. Operate only in good visibility and stable footing.
3. Tool Inspection: Check for damage before each use. Ensure all guards are in place.
4. Fuel Safety: Refuel outdoors only when engine is cool. Use approved fuel container.

WARNING! Risk of serious injury or death from blade contact, kickback, or improper use. Never operate with one hand.

Assembly & Preparation

Unpack and inspect contents. Assemble handle and attach cutting blade.

1. Handle Assembly: Attach D-loop handle to shaft using provided bolts. Tighten securely.
2. Blade Attachment: Align blade with drive mechanism. Secure with retaining bolt and washer.
3. Fuel Mix: Use STIHL 2-stroke engine oil mixed with unleaded gasoline at 50:1 ratio.
4. Fill Tanks: Add fuel mix to fuel tank and STIHL hedge trimmer oil to oil tank.

CAUTION! Ensure all fasteners are tight before operation. Use only STIHL-approved oils.

Specifications

• Model: HL 75
• Engine Displacement: 27.2 cc
• Power Output: 0.9 kW
• Cutting Teeth Spacing: 20 mm
• Max. Cutting Diameter: 20 mm
• Sound Pressure Level: 94 dB(A)
• Vibration Level (front/handle): 5.2/2.5 m/s²
• Fuel Consumption: Approx. 0.6 liters/hour
• Recommended Fuel: Unleaded gasoline min. 89 octane
• Warranty: 12 months commercial use, 24 months private use

Controls and Components

Main components located on handle and engine unit.

Handle Area: Throttle trigger, throttle trigger lockout, stop switch, choke lever, primer bulb, D-loop handle, front handle.

Engine Unit: Fuel tank cap, oil tank cap, air filter cover, spark plug, muffler, starter grip.

Cutting Assembly: Double-sided cutting blade, blade guard, oil outlet.

Operation

Starting, running, and stopping procedures.

1. Starting Cold Engine: Move stop switch to "I". Set choke lever to cold start position. Press primer bulb 5 times. Pull starter rope until engine fires. Move choke lever to run position. Pull starter rope to start.
2. Starting Warm Engine: Set choke lever to run position. Pull starter rope.
3. Operation: Hold trimmer with both hands. Squeeze throttle trigger lockout and throttle trigger to engage blade.
4. Stopping: Release throttle trigger. Move stop switch to "0".

Tip: Allow engine to warm up at idle for 30 seconds before full throttle operation.

Fuel & Lubrication

Use proper fuel mix and check oil level regularly.

1. Fuel Mix: 50:1 ratio (2% oil). Use STIHL HP Ultra or equivalent.
2. Refueling: Stop engine and allow to cool. Clean area around cap. Fill to marked level.
3. Blade Lubrication: Automatic system. Check oil level before each use. Manual override available.
4. Chain Oil: Use STIHL hedge trimmer oil for best performance.

WARNING! Never use straight gasoline or automotive oil. Do not smoke while refueling.

Maintenance

Regular maintenance ensures optimal performance and longevity.

Interval	Task
Daily	Clean air filter, check blade for damage, tighten fasteners
25 hours	Clean spark arrestor screen, check spark plug
100 hours	Replace spark plug, clean fuel filter
As needed	Sharpen blade, replace worn parts

Blade Sharpening: Use round file and guide. Maintain original angle. Replace if cracked or excessively worn.

Storage

Prepare trimmer for extended storage.

1. Short-term (under 4 weeks): Drain fuel tank and run engine until it stops. Clean exterior.
2. Long-term: Drain fuel completely. Remove spark plug, add 1 tsp oil through spark plug hole, pull starter rope slowly 2-3 times. Reinstall spark plug. Store in dry, secure location.

CAUTION! Never store with fuel in tank for more than 4 weeks. Fuel deterioration can damage engine.

Warranty Information

STIHL Limited Warranty: 12 months for commercial use, 24 months for private use from date of purchase. Warranty covers defects in materials and workmanship. Not covered: normal wear, misuse, improper maintenance, unauthorized repairs. Keep purchase receipt for warranty claims. Contact authorized STIHL dealer for service.

Troubleshooting

Symptom	Possible Cause	Corrective Action
Engine won't start	No fuel, flooded engine, spark plug	Check fuel level; wait if flooded; check/replace spark plug.
Engine runs poorly	Dirty air filter, old fuel, carburetor	Clean air filter; use fresh fuel; have dealer adjust carburetor.
Excessive vibration	Loose fasteners, damaged blade	Tighten all fasteners; inspect blade for damage.
Blade not oiling	Empty oil tank, clogged oil passage	Fill oil tank; clean oil outlet holes.
Blade dull quickly	Cutting dirty wood, improper technique	Clean branches before cutting; avoid contact with soil.

Service: For repairs, contact authorized STIHL dealer only.

Support: STIHL Incorporated, 536 Viking Drive, Virginia Beach, VA 23452, 1-800-467-8445