Stihl HL 90 Instruction Manual

Pages 72

Year 2015

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of 72

Stihl HL 90 Specification

The Stihl HL 90 is a professional-grade long-reach hedge trimmer designed for demanding landscaping tasks, offering both power and precision. It is equipped with a robust 28.4 cc, 2-stroke engine that delivers consistent performance while maintaining fuel efficiency and reduced emissions. The HL 90 features a long shaft that allows for an extended reach, facilitating the trimming of tall or wide hedges without the need for ladders or additional equipment. The cutting blade, which is adjustable up to 145 degrees, provides versatility in trimming angles, making it suitable for a variety of hedge shapes and sizes.

The hedge trimmer incorporates a multi-function control handle that enhances operational convenience, allowing the operator to access all controls with one hand. This design reduces fatigue and increases safety during prolonged use. The anti-vibration system integrated into the tool minimizes operator strain by significantly dampening engine and blade vibrations. The HL 90 also features a lightweight construction, weighing approximately 5.9 kg, which further contributes to ease of handling and maneuverability.

For maintenance, the Stihl HL 90 is designed with user-friendly features such as an easily accessible air filter and a tool-free fuel cap, simplifying routine servicing and refueling. The machine's overall ergonomic design ensures comfortable use, even during extended periods of operation. This hedge trimmer is engineered for both professional landscapers and serious garden enthusiasts who require reliable, high-performance equipment. With its combination of power, reach, and ease of use, the Stihl HL 90 stands out as a versatile tool for maintaining well-manicured hedges in residential and commercial settings.

Stihl HL 90 F.A.Q.

What is the correct fuel mixture for the Stihl HL 90?

The Stihl HL 90 requires a 50:1 fuel mixture, which means 50 parts gasoline to 1 part 2-stroke engine oil.

How do I properly start the Stihl HL 90?

To start the Stihl HL 90, set the choke, press the primer bulb several times, pull the starter cord until the engine fires, then move the choke to the run position and pull again until the engine starts.

How often should I clean the air filter on my Stihl HL 90?

It is recommended to check and clean the air filter after every 10 hours of use to ensure optimal performance.

What should I do if the Stihl HL 90 is not cutting efficiently?

If the cutting efficiency is reduced, check the blades for dullness or damage and sharpen or replace them as necessary. Also, ensure that the blade guard is clean and not obstructing movement.

How can I reduce vibration while using the Stihl HL 90?

Ensure that all components are securely fastened, and use anti-vibration gloves. Regular maintenance and proper handling can also help minimize vibration.

What maintenance should be performed regularly on the Stihl HL 90?

Regular maintenance includes checking and cleaning the air filter, inspecting the spark plug, checking the fuel system for leaks, and lubricating the gear mechanism.

Why does the Stihl HL 90 engine stall under load?

An engine stalling under load could be due to a clogged air filter, a dirty carburetor, or incorrect fuel mixture. Cleaning the air filter, adjusting the carburetor, and ensuring the correct fuel mixture can resolve this issue.

How do I adjust the carburetor on the Stihl HL 90?

To adjust the carburetor, locate the adjustment screws marked 'H' (high speed) and 'L' (low speed). Turn them carefully to fine-tune the engine performance. Refer to the manual for specific settings.

What is the recommended storage procedure for the Stihl HL 90?

For storage, clean the unit thoroughly, remove fuel from the tank, and run the engine until it stops to clear the carburetor. Store in a dry, safe place.

How do I replace the spark plug on the Stihl HL 90?

To replace the spark plug, remove the spark plug boot, use a spark plug wrench to unscrew the old plug, and install a new one by screwing it in by hand before tightening with the wrench. Ensure it is the correct type as specified in the manual.