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Stihl HT 75 - User Manual

Stihl HT 75
40 pages
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STIHL HT 75
Instruction Manual
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Stihl HT 75 Specifications

General IconGeneral
Engine Type2-stroke
Power Output0.95 kW
Weight7.6 kg
Overall Length270 cm
Power SourceGasoline
Bar Length30 cm
Recommended bar length30 cm
Displacement25.4 cm³
Engine Power1.2 hp
Engine displacement25.4 cc

Summary

Guide to Using this Manual

Pictograms

Meanings of pictograms attached to the machine.

Safety Precautions and Working Techniques

Special safety precautions

Observe precautions when working with the pole pruner.

Alcohol or drugs

Do not operate under influence of alcohol, drugs, or medication.

Only use approved parts

Use only STIHL approved or identical parts.

Wear proper protective clothing

Clothing must be sturdy but allow freedom of movement.

Eye injuries

Wear close-fitting safety glasses.

Sound protection

Wear ear defenders for sound protection.

Always stop the engine

Stop engine and fit chain scabbard when carrying.

Refueling

Gasoline is highly flammable

Keep away from fire/flame, no smoking, do not spill.

Always shut off the engine before refueling

Never refuel a hot engine to prevent fire.

Check for leaks

Do not start if there is a fuel leak. Risk of burns.

Before starting

Check that your power tool is properly assembled

Ensure assembly and good condition before use.

Check the fuel system for leaks

Check fuel cap, hose connections, manual fuel pump for leaks.

Spark plug boot

Check spark plug boot is secure to prevent sparking.

Starting the engine

Start engine away from fueling spot

Start engine at least 3 meters from fueling spot, outdoors.

Place power tool on level ground

Ensure good balance and secure footing.

Check engine idling speed

Chain must not move at idle.

Keep flammable materials away

Keep flammable materials away from hot exhaust/muffler.

Holding and guiding the machine

Always hold the power tool firmly with both hands

Hold firmly with right hand on control handle, left on drive tube.

While working

Switch off the engine immediately in emergency

Move slide control to STOP or 0 in emergencies.

Power tool is not insulated

Keep 15m away from electric power lines – danger of shock.

Take breaks when tired

Take breaks when tired or fatigued to prevent accidents.

Limbing

Hold the power tool at an angle

Hold tool at an angle, not directly under limb. Max 60° from horizontal.

Stop work if suffering from nausea

Stop if experiencing nausea, headaches, impaired vision, etc.

Vibrations

Prolonged use may result in circulation problems

Prolonged use can cause vibration-induced circulation problems (whitefinger).

Monitor condition of hands and fingers

Monitor hands/fingers; seek medical advice for symptoms like tingling.

Maintenance and Repairs

Service the machine regularly

Service regularly; do not attempt un-described work.

Only use high-quality replacement parts

Use quality parts to avoid accidents and damage.

Always shut off the engine before maintenance

Shut off engine before maintenance or cleaning (except adjustments).

Avoid direct contact with skin

Avoid skin contact and inhaling gasoline vapor.

Using the Unit

Preparation

Wear protective clothing, adjust shaft, fit harness.

Cutting sequence

Cut lower branches first, prune heavy branches in pieces.

Never stand directly underneath the branch

Avoid cutting directly overhead; branches may spring back.

Working techniques

Hold control handle with right hand, shaft with left. Adjust arm position.

Cutting Attachment

Pitch, sprocket and guide bar must match

Chain pitch, sprocket, and guide bar must match.

Non-matching components can cause damage

Using non-matching parts can cause damage.

Mounting the Bar and Chain

Fitting the saw chain

Fit chain over sprocket, engage tensioner slide.

Wear work gloves

Protect hands from sharp cutters.

Turn the tensioning screw clockwise

Turn screw until chain has little sag.

Tensioning the Chain

Retensioning during cutting work

Steps for retensioning chain during use.

Hold the bar nose up

Hold bar nose up while tensioning.

Check chain tension frequently

Check chain tension frequently per Operating Instructions.

Adjusting the Throttle Cable

Properly adjusted cable is precondition for correct operation

Correct cable adjustment ensures proper operation.

Press down trigger lockout and squeeze throttle trigger

Engage lockout and squeeze trigger to set cable.

Fuel

Engine requires mixture of gasoline and engine oil

Engine needs a gasoline and oil mixture.

Avoid direct skin contact with gasoline

Health warning about gasoline contact and vapor.

Mixing Fuel

Instructions for mixing fuel and oil.

Mix Ratio

STIHL 50:1 ratio for two-stroke engine oil.

Fueling

Before fueling, clean the filler cap

Clean filler cap and area to prevent dirt entry.

Do not spill fuel while fueling

Avoid spilling fuel; use STIHL filler nozzle.

Chain Lubricant

Use only quality chain and bar lubricant

Use quality lubricant for chain/bar lubrication.

Do not use waste oil

Do not use waste oil; it's harmful and unsuitable.

Filling Chain Oil Tank

Never allow oil tank to run dry

Avoid running the oil tank dry.

Checking Chain Lubrication

Saw chain must always throw off a small amount of oil

Chain must throw off a small amount of oil.

Never operate without chain lubrication

Never operate without lubrication; it damages the attachment.

After breaking in chain, check tension

Check and adjust chain tension after break-in.

Adjusting the Telescoping Shaft

Always shut off engine and fit chain scabbard

Stop engine and fit scabbard before adjusting shaft.

Adjust the shaft to the required length

Adjust shaft to desired working length.

Fitting the Harness

Shoulder Strap

Put on shoulder strap and adjust length.

Starting; Stopping the Engine

Starting

Steps to start the engine.

Set the choke lever

Set choke lever based on engine temperature (cold/warm).

Blip the throttle trigger to disengage starting throttle

Blip throttle to move slide to normal run position I.

If the engine does not start

Troubleshooting steps if engine fails to start.

Start engine by pulling starter rope

Pull starter rope briskly; 10-20 pulls may be needed.

Operating Instructions

During Break-In Period

Avoid high revs for first three tank fillings.

Do not make the mixture leaner

Do not lean mixture for power; it can damage engine.

Chain cold

Chain tension check for cold chain.

Always slacken off the chain after finishing work

Slacken chain after work to prevent bearing damage.

Taking Care of the Guide Bar

Turn the bar over

Turn bar over when sharpening chain or replacing it.

Regularly clean the oil inlet hole

Clean oil inlet hole, oilway, and bar groove.

Measure the groove depth

Measure groove depth with filing gauge.

If groove depth is less than specified

Replace guide bar if groove depth is insufficient.

Cleaning the Air Filter

Dirty air filters reduce engine power

Dirty filters reduce power, increase fuel consumption, make starting harder.

Wash the foam element

Wash foam element in soapy water and dry.

Adjusting the Carburetor

Standard Setting

Steps for standard carburetor adjustment.

Fine Tuning

Adjustments for high altitude or sea level.

Adjusting Idle Speed

Adjust idle speed (LA) for smooth running.

Spark Plug

If the engine is down on power

Check spark plug if engine has low power or runs poorly.

Check electrode gap

Check and readjust electrode gap.

Rectify problems causing fouling

Fix causes of spark plug fouling (oil, filter, conditions).

Storing the Machine

For periods of 3 months or longer

Steps for storing machine for 3+ months.

Run the engine until the carburetor is dry

Run engine to dry carburetor, prevent sticking.

Store the machine in a dry, high or locked location

Store in dry, secure location away from children.

Checking and Replacing the Chain Sprocket

Replace the chain sprocket

Replace sprocket after two chains or when worn.

Wear marks on sprocket

Check for wear marks deeper than 0.5 mm.

Maintaining and Sharpening the Saw Chain

Do not work with a dull or damaged chain

Dull chains increase effort and wear.

Comply with angles and dimensions

Comply with angles/dimensions; incorrect sharpening increases kickback risk.

Filing and side plate angles

Select file diameter according to chain pitch

Choose file diameter based on chain pitch.

Observe certain angles when resharpening

Observe angles when resharpening chain cutters.

File correctly

Select sharpening tools according to chain pitch

Choose tools based on chain pitch.

Sharpen the chain frequently

Sharpen frequently with 2-3 strokes.

All cutters must be the same length

Ensure all cutters are the same length.

Lowering depth gauges

Use a filing gauge to check the setting

Use filing gauge to check setting every time.

File down the depth gauge until it is level

File depth gauge level with filing gauge.

Other parts of humped drive link must not be filed

Do not file other humped drive link parts; increases kickback.

Kickback tendency increased if depth gauges are too low

Low depth gauges increase kickback tendency.

Sharpening Tools (special accessories)

Place the filing gauge on the chain

Ensure highest point of depth gauge is level with filing gauge.

Maintenance and Care

Complete machine

Visual inspection and cleaning intervals.

Air filter

Check and replace intervals.

Chain lubrication

Check and inspect sharpness intervals.

Saw chain

Check tension and sharpen intervals.

Guide bar

Check (wear, damage)

Check guide bar for wear and damage.

Replace

Replace guide bar when worn.

Minimize Wear and Avoid Damage

Observing the instructions in this manual

Following instructions reduces wear and damage.

User is responsible for all damage caused by non-observance

User responsible for damage from non-compliance.

Parts Subject to Wear and Tear

Saw chain, guide bar

Saw chain and guide bar are subject to wear.

Filters (air, oil, fuel)

Air, oil, and fuel filters are wear parts.

Main Parts

Telescopic shaft

Part 1 of the machine.

Guide bar

Part 10 of the machine.

Fuel tank

Part 20 of the machine.

Carburetor adjusting screws

Part 25 of the machine.

Specifications

Engine

Details of the STIHL single-cylinder two-stroke engine.

Cutting attachment

Specifications for cutting attachment components.

Sound and Vibration Levels

Noise and vibration data measurements.

Maintenance and Repairs

Disposal

Observe all country-specific waste disposal rules

Follow all waste disposal rules and regulations.

STIHL products must not be thrown in the garbage can

Dispose of products at approved sites for recycling.

EC Declaration of Conformity

Designation: Pole pruner

Designation of the product.

Make: STIHL

Manufacturer of the product.

Series: HT 75

Model series of the product.

Conforms to relevant provisions of Directives

Product conforms to relevant EU directives.

Developed and manufactured in compliance with standards

Developed/manufactured according to specified standards.

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