Husqvarna 123C User Manual

English – 19
MAINTENANCE
Fine adjustment of the idle speed T
Adjust the idle speed using the idle adjustment screw T, if it is
necessary to readjust. First turn the idle adjustment screw T
clockwise until the cutting attachment starts to rotate. Then
turn the screw anticlockwise until the cutting attachment
stops. The idle speed is correctly adjusted when the engine
will run smoothly in every position. The idle speed should also
be well below the speed at which the cutting attachment starts
to rotate.
WARNING! If the idle speed cannot be adjusted so that the
cutting attachment stops, contact your dealer/service
workshop. Do not use the machine until it has been correctly
adjusted or repaired.
High speed jet H
The high speed jet H affects the engine power, speed,
temperature and fuel consumption. If the high speed jet H is
set too lean (screwed in too far) the engine speed will be too
high and cause engine damage. Do not let the engine run at
full speed for more than 10 seconds.
Apply full throttle and turn the high speed jet H very slowly
clockwise until the engine slows down. Then turn the high
speed jet H very slowly anticlockwise until the engine starts to
run unevenly. Now turn the high speed jet H slowly clockwise
a little way until the engine runs smoothly.
Note that the engine should not be under load when you
adjust the high speed jet H. You should therefore remove the
cutting attachment, nut, support flange and drive disc before
adjusting the high speed jet H.
The high speed jet H is adjusted correctly when the machine
burbles a little. If the machine races then the setting is too
lean. If the engine produces a lot of smoke and burbles a lot
then the setting is too rich.
CAUTION! For optimum adjustment of the carburettor,
contact a qualified dealer/service workshop that has a
revolution counter at their disposal.
Correctly adjusted carburettor
When the carburettor is correctly adjusted the machine will
accelerate without hesitation and burble a little at maximum
speed. It is also important that the cutting attachment does
not rotate at idle. If the low speed jet L is set too lean it may
cause starting difficulties and poor acceleration.
If the high speed jet H is set too lean it will result in less power,
less performance, poor acceleration and/or damage to the
engine.
If both the L and H jets are set too rich it will results in
acceleration problems or too low a working speed.
Muffler
CAUTION! Some mufflers are fitted with a catalytic converter.
See chapter on Technical data to see whether your machine
is fitted with a catalytic converter.
The muffler is designed to reduce the noise level and to direct
the exhaust gases away from the operator. The exhaust gases
are hot and can contain sparks, which may cause fire if
directed against dry and combustible material.
Some mufflers are equipped with a special spark arrestor
mesh. If your machine has this type of muffler, you should
clean the mesh at least once a week. This is best done with a
wire brush. On mufflers without a catalytic converter the mesh
should be cleaned weekly, or replaced if necessary. On
mufflers fitted with a catalytic converter the mesh should be
checked, and if necessary cleaned, monthly. If the mesh is
damaged it should be replaced.
If the mesh is frequently blocked, this can be a sign that the
performance of the catalytic converter is impaired. Contact
your dealer to inspect the muffler. A blocked mesh will cause
the machine to overheat and result in damage to the cylinder
and piston.
CAUTION! Never use a machine with a defective muffler.
H
!
WARNING! Mufflers fitted with catalytic
converters get very hot during use and
remain so for some time after stopping. This
also applies at idle speed. Contact can result
in burns to the skin. Remember the risk of
fire!

Husqvarna 123C Specifications

General

Weight (excluding cutting equipment)	4.4 kg
Fuel Tank Volume/Capacity	0.5 L
Line Diameter	2.0 mm
Engine Type	2-stroke
Shaft Type	Straight
Starter System	Recoil

Summary

Key to Symbols

Symbols

Details the meaning and context of various safety and operational symbols used in the manual.

Note the Following Before Starting

Safety Instructions

Personal Protective Equipment

Details required safety gear like helmet, hearing protection, and eye protection.

Machine's Safety Equipment

Explains the machine's safety features and their maintenance.

Safety Instructions

Vibration Damping System

Explains the vibration damping system and its importance.

Muffler

Discusses the muffler's function, heat, and potential hazards.

Cutting Equipment

Describes the trimmer head and its cutting function.

Safety Instructions

Checking, Maintaining and Servicing the Machine's Safety Equipment

Details checks for throttle lock, stop switch, guards, etc.

Vibration Damping System

Details regular checks for cracks or deformation in vibration damping units.

Muffler

Advises on checking muffler security and spark arrestor mesh.

Safety Instructions

Cutting Equipment

How to choose and maintain cutting equipment for performance and longevity.

General Rules

General rules for using cutting attachments and guards safely.

Locking Nut

Instructions on how to tighten and maintain the locking nut for cutting attachments.

Trimmer Head

Guidance on selecting and using recommended trimmer heads and cords.

Safety Instructions

General Safety Precautions

Important precautions for safe operation, including environmental conditions and operator fitness.

Starting

Procedures and warnings related to starting the machine safely.

Fuel Safety

Precautions for safe handling, storage, and refueling of fuel.

Transport and Storage

Guidelines for safely transporting and storing the machine and fuel.

Safety Instructions

General Working Instructions

General advice for working with clearing saws and trimmers, and when to seek expert help.

Basic Safety Rules

Key safety rules to follow during operation, including awareness of surroundings and weather.

Basic Working Techniques

Techniques for trimming grass and clearing vegetation using the machine.

Safety Instructions

Cutting

How to use the trimmer effectively for cutting grass and avoiding damage.

Sweeping

Method for using the rotating cord for quick and easy clearing up.

What is What?

Assembly

Fitting the Loop Handle

Instructions for attaching the loop handle to the machine shaft.

Assembling and Dismantling the Two-Piece Shaft

Steps for connecting and disconnecting the two-piece shaft assembly.

Fitting the Trimmer Guard and Trimmer Head

How to attach the trimmer guard and trimmer head to the shaft.

Assembly

Fitting the Trimmer Guard and Trimmer Head

Specific instructions for fitting the guard and trimmer head for the 123C model.

Fuel Handling

Fuel

Information on using unleaded gasoline, octane rating, and catalytic converters.

Two-Stroke Oil

Recommends Husqvarna oil and warns against using other types.

Mixing

Step-by-step guide on how to mix gasoline and two-stroke oil correctly.

Fuel Handling

Fuelling

Precautions and steps for safe refueling of the machine.

Starting and Stopping

Check Before Starting

Essential checks to perform on the machine before starting the engine.

Starting and Stopping

Details on starting procedures for cold and warm engines and how to stop the machine.

Starting and Stopping

Warm Engine

Steps for starting the engine when it is already warm.

Starting

Detailed instructions for pulling the starter cord to start the engine.

Stopping

How to safely stop the engine using the stop switch.

Maintenance

Carburettor

Explains the carburettor's function, adjustment, and basic/fine settings.

Maintenance

Fine Adjustment of the Idle Speed T

Details on adjusting the idle speed screw (T) for smooth operation.

High Speed Jet H

How to adjust the high-speed jet (H) for optimal engine performance.

Muffler

Information on muffler types, catalytic converters, and cleaning the spark arrestor mesh.

Maintenance

Cooling System

How to keep the cooling system clean for optimal engine temperature.

Spark Plug

Explains spark plug condition, cleaning, gap adjustment, and replacement.

Two-Piece Shaft

Instructions for lubricating the drive shaft ends on two-piece shaft models.

Air Filter

Importance of air filter maintenance, cleaning, and replacement.

Maintenance

Bevel Gear

Guidance on checking and refilling grease in the bevel gear.

Maintenance Schedule

A schedule outlining daily, weekly, and monthly maintenance tasks.

Technical Data

Technical Data

Approved Accessories

Lists approved accessories for models 123C, 123L, and 123LD.

Attachments

Details various attachments and their compatibility with specific machine models.

Federal Emission Control Warranty Statement

Your Warranty Rights and Obligations

Outlines the warranty terms, owner responsibilities, and coverage for emission-related parts.

T35 Trimmer Head Instructions

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