STIHL HT75 Manual

The STIHL HT75 is a professional-grade pole pruner designed for tree trimming and pruning at heights. It features a powerful 25.4cc 2-stroke engine, adjustable shaft length, automatic oiler, anti-vibration system, and a high-performance cutting bar and chain. Below are key sections for safety, features, assembly, operation, maintenance, and troubleshooting.

Features at a Glance

Key components: 25.4cc 2-stroke engine, adjustable telescopic shaft, automatic chain oiler, anti-vibration system, QuickStop chain brake, STIHL Rollomatic E bar, and ergonomic handles.

Feature	Description
Engine	25.4cc 2-stroke air-cooled engine
Shaft	Adjustable telescopic shaft for extended reach
Chain Oiler	Automatic oiling system with manual override
Anti-Vibration	Reduces operator fatigue during extended use
Chain Brake	QuickStop inertia-activated chain brake
Cutting Attachment	STIHL Rollomatic E guide bar and chain
Fuel Tank	Integrated fuel tank with easy-fill cap
Oil Tank	Separate oil reservoir for chain lubrication
Throttle Lock	Safety throttle lockout to prevent accidental acceleration
Handle	Ergonomic rear handle with grip

Safety Instructions

Read all instructions before operation. Wear appropriate PPE.

1. Always wear safety glasses, hearing protection, gloves, and sturdy footwear.
2. Inspect unit before each use for damage or loose parts.
3. Clear work area of bystanders, especially children and pets.
4. Maintain secure footing and balance while operating at height.
5. Never operate on ladders or unstable surfaces.

WARNING! Risk of serious injury or death from kickback, falling branches, or loss of control. Always operate with both hands.

Assembly & Preparation

Assemble pole pruner before first use.

1. Attach cutting attachment: Align bar with drive socket and secure with nuts.
2. Install chain: Place chain on bar, ensuring cutting teeth face forward.
3. Adjust shaft length: Loosen clamp, extend to desired length, retighten securely.
4. Fuel mix: Use 50:1 gasoline to STIHL 2-stroke oil. Fill fuel tank.
5. Chain oil: Fill oil reservoir with STIHL chain oil or equivalent.

CAUTION! Ensure all fasteners are tightened securely before operation.

Specifications

• Engine Displacement: 25.4 cc
• Power Output: 1.1 kW / 1.5 hp
• Fuel Capacity: 0.42 liters
• Oil Capacity: 0.20 liters
• Bar Length: 25 cm (10 inches)
• Chain Pitch: 1/4" PM3
• Max. Cutting Diameter: 20 cm (8 inches)
• Weight (without cutting attachment): 5.8 kg
• Sound Pressure Level: 106 dB(A)
• Vibration Level: 4.5 m/s²

Controls and Functions

Main controls located on rear handle assembly.

Rear Handle: Throttle trigger, throttle lockout, stop switch, choke lever, primer bulb.

Shaft: Telescopic adjustment clamp, drive shaft coupling.

Cutting Head: Chain brake lever, manual oiler button (if equipped), bar tip guard.

Operation: Press throttle lockout while squeezing throttle trigger to accelerate. Use stop switch to shut off engine. Choke for cold starts.

Operation Instructions

Starting and using the pole pruner.

1. Starting Cold Engine: Set stop switch to "I", move choke lever to closed, press primer 5 times, pull starter cord until engine fires, move choke to open, pull again to start.
2. Starting Warm Engine: Choke open, pull starter cord.
3. Cutting Technique: Hold unit firmly, let chain reach full speed before cutting, use tip of bar for pruning, avoid pushing or forcing.
4. Shutting Down: Release throttle, allow engine to idle, press stop switch to "0".

Tip: Allow engine to warm up for 30 seconds before cutting.

Maintenance & Cleaning

Regular maintenance ensures optimal performance and longevity.

1. Air Filter: Clean weekly; replace if damaged.
2. Spark Plug: Check gap (0.5 mm); replace annually.
3. Fuel Filter: Replace every 3 months or as needed.
4. Exhaust Port & Screen: Clean carbon deposits regularly.
5. External Cleaning: Wipe with damp cloth; avoid water ingress.

WARNING! Always disconnect spark plug before performing maintenance.

Chain & Bar Care

Proper chain maintenance is critical for safety and performance.

1. Chain Tension: Adjust when cold; chain should snap back when pulled from bar.
2. Sharpening: Use round file (4.0 mm) at 30° angle; maintain depth gauges.
3. Bar Maintenance: Clean bar groove weekly; flip bar monthly for even wear.
4. Oiling: Check oil flow before each use; adjust oiler screw if needed.

CAUTION! Always wear gloves when handling chain.

Storage Guidelines

Store properly to prevent damage and fuel issues.

1. Short-term: Empty fuel tank or add fuel stabilizer.
2. Long-term: Drain fuel completely, run engine until it stops, remove spark plug and add 1 tsp oil, pull starter slowly to distribute.
3. Clean unit thoroughly before storage.
4. Store in dry, secure location away from children.

Tip: Hang unit by rear handle to save space.

Warranty Information

STIHL Limited Warranty: 12 months commercial use, 24 months private use from date of purchase. Warranty covers defects in materials and workmanship. Not covered: normal wear, misuse, improper maintenance, non-STIHL parts. For warranty service, contact authorized STIHL dealer with proof of purchase. For support, visit www.stihlusa.com or call 1-800-467-8445.

Troubleshooting

Symptom	Possible Cause	Corrective Action
Engine won't start	Fuel, spark, air	Check fuel mix, spark plug, air filter; use fresh fuel.
Engine runs poorly	Carburetor, filter	Clean air filter; adjust carburetor (by dealer).
Chain doesn't turn	Brake engaged, clutch	Disengage chain brake; check clutch drum.
Excessive vibration	Loose parts, chain	Tighten all fasteners; check chain tension.
Chain not oiling	Empty tank, clog	Fill oil tank; clean oil passages.
Overheating	Dull chain, mixture	Sharpen chain; check fuel/oil ratio.

Service: For repairs, contact authorized STIHL dealer only.

Support: 1-800-467-8445; www.stihlusa.com