Stihl STIHL FS 94 STIHL FS 94 (en)

FS 94
2 - 38 Instruction Manual
English
Contents
1 Guide to Using this Manual.........................2
2 Safety Precautions and Working Techni‐
ques............................................................ 2
3 Approved Combinations of Cutting Attach‐
ment, Deflector, Handle and Harness.......11
4 Approved Power Tool Attachments.......... 12
5 Mounting the Bike Handle.........................12
6 Mounting the Loop Handle........................13
7 Fitting the Carrying Ring........................... 16
8 Mounting the deflector.............................. 16
9 Mounting the Cutting Attachment..............17
10 Fuel........................................................... 21
11 Fueling...................................................... 22
12 Fitting the Harness....................................22
13 Balancing the Machine..............................24
14 Starting / Stopping the Engine.................. 25
15 Transporting the Unit................................ 27
16 Operating Instructions...............................28
17 Cleaning the Air Filter............................... 28
18 Adjusting the Carburetor........................... 29
19 Spark Plug................................................ 29
20 Lubricating the Gearbox............................30
21 Storing the Machine.................................. 30
22 Sharpening Metal Cutting Blades............. 31
23 Maintaining the Mowing Head...................31
24 Inspection and Maintenance by User........32
25 Inspections and Maintenance by Dealer...33
26 Maintenance and Care..............................34
27 Main Parts.................................................35
28 Specifications............................................36
29 Maintenance and Repairs......................... 37
30 Disposal.................................................... 37
31 EC Declaration of Conformity................... 37

1.1 Pictograms

The meanings of the pictograms attached to the machine are explained in this manual.
Depending on the model concerned, the follow‐ ing pictograms may be attached to your machine.
Fuel tank; fuel mixture of gasoline and engine oil
Operate decompression valve
Manual fuel pump
Operate manual fuel pump
Tube of grease
Intake air: Summer operation
Intake air: Winter operation
Handle heating

1.2 Symbols in text

WARNING
Warning where there is a risk of an accident or personal injury or serious damage to property.
NOTICE
Caution where there is a risk of damaging the machine or its individual components.

1.3 Engineering improvements

STIHL's philosophy is to continually improve all of its products. For this reason we may modify the design, engineering and appearance of our products periodically.
Therefore, some changes, modifications and improvements may not be covered in this man‐ ual.
2 Safety Precautions and
Working Techniques
Because the machine is a high-speed fast-cutting power tool, special safety precautions must be observed to reduce the risk of personal injury.
It is important you read and under‐ stand the User Manual before com‐ missioning and keep it in a safe place for future reference. Non-compliance with the User Manual may cause seri‐ ous or even fatal injury.
Observe all applicable local safety regulations, e.g. by trade organizations, social insurance institutions, labor safety authorities etc.
If you have never used a power tool before: Have your dealer or other experienced user show you how to operate your machine – or
Original Instruction Manual
0000008143_012_GB
Printed on chlorine-free paper
Printing inks contain vegetable oils, paper can be recycled.
© ANDREAS STIHL AG & Co. KG 2022
0458-593-8321-C. VA2.E22.
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2 Safety Precautions and Working Techniques English
attend a special course to learn how to operate it.
Minors should never be allowed to use the machine – except for apprentices over the age of 16 when working under supervision.
Children, animals and bystanders must remain at a distance.
When not using the machine, it must be laid down in such a way that it does not endanger anyone. Ensure that the machine cannot be used without authorization.
The user is responsible for accidents or risks involving third parties or their property.
Do not lend or rent your power tool without the User Manual. Be sure that anyone using it under‐ stands the information contained in this manual.
The use of machines that emit noise may be limi‐ ted to certain hours of the day as specified by national and/or regional or local regulations.
Anyone operating the machine must be well res‐ ted, in good physical health and in good mental condition.
If you have any condition that might be aggrava‐ ted by strenuous work, check with your doctor before operating a machine.
If you have a pacemaker: The ignition system of your machine produces an electromagnetic field of very low intensity. This field may interfere with some pacemakers. STIHL recommends that per‐ sons with pacemakers consult their physician and the pacemaker manufacturer to reduce any health risk.
Anyone who has consumed alcohol or drugs or medicines affecting their ability to react must not operate a power tool.
Depending on the cutting attachment fitted, use your power tool only for cutting grass, wild growth, shrubs, scrub, bushes, small diameter trees and similar materials.
The machine must not be used for any other pur‐ poses – risk of accidents!
Only use cutting attachments and accessories that are explicitly approved for this power tool model by STIHL or are technically identical. If you have any questions in this respect, consult your dealer. Use only high quality parts and accessories. in order to avoid the risk of acci‐ dents and damage to the machine.
STIHL recommends the use of original STIHL tools and accessories. They are specifically designed to match the product and meet your performance requirements.
Never attempt to modify your power tool in any way since this may increase the risk of personal injury. STIHL excludes all liability for personal injury and damage to property caused while using unauthorised attachments.
The guard provided with your machine may not protect the operator from all foreign objects (gravel, glass, wire etc.) ejected by the revolving cutting attachment. Ejected objects may also ric‐ ochet and strike the operator.
Do not use a high-pressure washer to clean the power tool. The solid jet of water may damage parts of the unit.

2.1 Clothing and equipment

Wear proper protective clothing and equipment.
Clothing must be sturdy but allow complete freedom of movement. Wear close-fitting clothes such as a boiler suit, not a loose jacket.
Do not wear clothing which could become trap‐ ped in wood, brush or moving parts of the machine. Do not wear a scarf, necktie or jewelry. Tie up and confine long hair above your should‐ ers.
Wear safety boots with steel toe caps and non-slip soles.
Sturdy shoes with non-slip shoes are permissible only when using mowing heads.
WARNING
To reduce the risk of eye injuries, wear close-fitting safety glasses in accordance with European Standard EN 166. Make sure the safety glasses are a snug fit.
Wear face protection and make sure it is a good fit. Face protection alone is not sufficient to pro‐ tect the eyes.
Wear "personal" sound protection, e.g. ear defenders.
Wear a safety hard hat for thinning operations, when working in high scrub and where there is a danger of head injuries from falling objects.
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English 2 Safety Precautions and Working Techniques
Wear sturdy protective gloves made of a resistant material (e.g. leather).
STIHL can supply a comprehensive range of per‐ sonal protective equipment.

2.2 Transporting the machine

Do not fuel a hot engine – fuel may spill and cause a fire.
Open the fuel cap carefully to allow any pressure build-up in the tank to release slowly and avoid fuel spillage.
Only refuel the machine in a well ventilated place. If fuel has been spilled, immediately clean the machine – do not allow your clothes to be splashed with fuel. If that happens, change your clothes at once.
After refueling, close the fuel cap as tightly as possible.
This helps reduce the risk of engine vibrations causing an incorrectly tightened fuel cap to loosen or come off and spill fuel.
Check for leaks. Do not start the engine if there is a fuel leak – serious or fatal burns could result!

2.4 Before starting

Check that your power tool is properly assem‐ bled and in good condition – refer to appropriate chapters in the User Manual.
Check the fuel system for leaks, especially the
visible parts, e. g., fuel cap, hose connections, manual fuel pump (only in machines with a manual fuel pump). In case of leakage and damage, do not start the engine – risk of fire!
Always stop the engine.
The tool should be carried hanging on the har‐ ness or by the shaft, in such a way that it is bal‐ anced.
To reduce the risk of cut injuries, fit transport guard on the cutting attachment, even when car‐ rying the tool for short distances – see also "Transporting the Unit".
Avoid touching hot parts of the machine and gearbox – risk of burns!
By vehicle: When transporting in a vehicle, prop‐ erly secure your machine to prevent turnover, damage and fuel spillage.

2.3 Refueling

Gasoline is highly flammable – keep away from fire or flame – do not spill any fuel – no smoking.
Always shut off the engine before refueling.
Have the machine serviced by a dealer before using it Use only an approved combination of cutting
attachment, deflector, handle and harness. All parts must be assembled properly and securely The stop switch / slide control must be easy to
actuate Check the rotary knob for warm start, throttle
trigger lockout, throttle trigger and set wheel for smooth action – the throttle trigger must return automatically to idle position. From the warm start knob position g, it must return to the run position F when the throttle trigger lockout and throttle trigger are pressed simul‐ taneously Check that the spark plug boot is secure – a
loose boot may cause sparking that could ignite combustible fumes and cause a fire! Cutting attachment or interchangeable attach‐
ment: correctly fitted, secure and in perfect condition Safety devices (e. g., deflector for cutting
attachments, rider plate) for damage and/or
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0208BA005 KN
0208BA006 KN
15m (50ft)
2 Safety Precautions and Working Techniques English
wear. Always replace damaged parts. Do not use the machine with a damaged deflector or worn rider plate (if the writing and arrows are no longer discernible) Never attempt to modify the controls or safety
devices Keep the handles dry and clean – free from oil
and dirt – this is important for safe control of the machine Adjust the harness and handle(s) to suit your
height and reach Note the information in the chapters "Fitting the Harness" and "Balancing the Machine".
To reduce the risk of personal injury, do not operate your power tool if it is damaged or not properly assembled!
To prepare for emergencies when using a har‐ ness: Practice setting down the machine quickly. To avoid damage, do not throw the machine to the ground when practicing.

2.5 Starting the engine

Start the engine at least 3 meters from the fuel‐ ing spot, outdoors only.
Place the unit on firm ground in an open area. Make sure you have good balance and secure footing. Hold the unit securely. The cutting attachment must be clear of the ground and all other obstructions because it may begin to run when the engine starts.
This is a one-person machine – ensure that there is no-one within 15 meters of the machine, not even when starting the power tool! Risk of injury due to ejected objects!
Avoid contact with the cutting attach‐ ment – risk of injury!
Do not drop-start the power tool – start the engine as described in the User Manual. The cutting attachment runs on for a short while after releas‐ ing the throttle trigger – coasting effect!
Check engine idling: The cutting attachment must remain at a standstill when the engine idles – throttle trigger released.
Keep easily combustible materials (e. g., wood chips, bark, dry grass, fuel) away from hot exhaust gases and hot muffler surfaces – risk of fire!

2.6 Holding and guiding the machine

Always hold the unit firmly with both hands on the handles.
Make sure you always have good balance and secure footing.
2.6.1 For versions with bike handle
Right hand on control handle, left hand on grip on handlebar.
2.6.2 For versions with loop handle
Left hand on loop handle, right hand on control handle, even if you are left-handed.

2.7 While working

Make sure you always have a firm and secure footing.
In the event of impending danger or in an emer‐ gency, shut off the engine immediately – move the stop switch / slide control in the direction of 0.
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English 2 Safety Precautions and Working Techniques
There is a risk of accident due to ejected objects within a wide area around the working space, so ensure there is no-one within a 15 m radius of the tool. This distance must also be maintained in relation to objects (vehicles, window panes) – risk of property damage! Even at a distance over 15 m, danger cannot be ruled out.
Check that the engine is properly idling so that the cutting tool will not continue rotating after you release the throttle trigger.
Check and correct the idle speed setting at regu‐ lar intervals. If the cutting attachment still rotates at idle speed, have your dealer make proper adjustments or repairs. STIHL recommends you have this work done by a STIHL servicing dealer.
Take special care in slippery conditions – damp, snow, ice, on slopes or uneven ground.
Watch out for obstacles: tree stumps, roots – risk of tripping or stumbling!
Only work while standing on the ground, never on a ladder, work platform or other unstable sur‐ face.
Be particularly alert and cautious when wearing hearing protection because your ability to hear warnings (shouts, alarms, etc.) is restricted.
Take breaks when you start getting tired or feel‐ ing fatigue – risk of accidents!
Work calmly and carefully – in daylight conditions and only when visibility is good. Proceed with caution, do not put others in danger.
As soon as the engine is running, the power machine generates toxic exhaust gas.As soon as the engine is running, the power machine gener‐ ates toxic exhaust gas. These gases may be odorless and invisible and may contain unburned hydrocarbons and benzene. Never run the engine indoors or in poorly ventilated loca‐ tions, even if your model is equipped with a catalytic converter.
To reduce the risk of serious or fatal injury from breathing toxic fumes, ensure proper ventilation when working in trenches, hollows or other con‐ fined locations.
Stop work immediately if you start suffering from nausea, headaches, impaired vision (e.g. your field of vision gets smaller), impaired hearing, dizziness, or impaired concentration – these symptoms may possibly be the result of too-high exhaust gas concentration – Risk of accidents!
Operate your power tool so that it produces a minimum of noise and emissions – do not run the engine unnecessarily, accelerate the engine only when working.
To reduce the risk of fire, do not smoke while operating or standing near your power tool. Com‐ bustible fuel vapor may escape from the fuel sys‐ tem.
Dust, fumes and smoke produced while working may be hazardous to your health. Wear respira‐ tory protection in case of heavy dust or smoke emission.
If your power tool is subjected to unusually high loads for which it was not designed (e.g. heavy impact or a fall), always check that it is in good condition before continuing work – see also "Before Starting".
Check in particular that the fuel system has no leaks and the safety equipment is fully operative. Never use a power tool that is no longer safe to operate. In case of doubt, contact a dealer.
To reduce the risk of injuryfrom thrown objects, never operate the unit without the proper deflector for the type of cutting attachment being used.
Check the work site – rocks, metal objects etc. may be caught up and ejected – possibly over a distance of 15 m – risk of injury! – They can also damage the cutting attachment and other property (e. g. parking vehicles, windows).
Be particularly careful when working on difficult, densely grown terrain.
When mowing in high shrubbery, under shrub‐ bery and hedges: Hold the cutting tool at a work‐ ing height of at least 15 cm – avoid risks to ani‐ mals.
Always shut off the engine before leaving the unit unattended.
Examine the cutting attachment periodically at short intervals and as soon as you note any noticeable changes:
Stop the engine, hold the machine securely,
allow the cutting attachment to come to a stop Check condition and secure fitting; watch out
for cracks Ensure that the cutting blades are sharp
Replace damaged or blunt cutting attachments
immediately, even in the event of minor hair‐ line cracks
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2 Safety Precautions and Working Techniques English
Clean grass and plant residue off the cutting attachment mounting at regular intervals – remove any build up of material from the cutting attachment and deflector.
To reduce the risk of injury, shut off the engine before replacing the cutting attachment.
The gearbox gets hot during opera‐ tion. Never touch the gearbox – risk of burns!
Do not continue using or attempt to repair dam‐ aged or cracked cutting attachments by welding, straightening or modifying the shape (out of bal‐ ance).
Particles or pieces may come off and hit the operator or a bystander at a high speed – risk of most severe injuries!
If a rotating cutting attachment touches a rock or another hard object, sparks may be generated which may possibly ignite combustible materials. Also dried-out plants and brushwood are com‐ bustible, above all in hot and dry weather. If there is a risk of fire, do not use cutting attach‐ ments in the vicinity of combustible materials, dried-out plants or brushwood. It is mandatory that you ask the responsible forestry office about any fire hazard conditions.

2.8 Using mowing heads

Extend the cutting attachment deflector with the attached parts specified in the User Manual.
Only use a deflector with a properly fitted blade, to limit the mowing line to the permissible length.
To adjust the mowing line in manually adjustable mowing heads, always switch off the engine first – risk of injury!
Misuse with mowing lines that are too long reduces the working speed of the engine. The constant slipping of the clutch causes overheat‐ ing and damage to important components (e. g. clutch, plastic housing parts) – e. g. due to the cutting attachment rotating during idling – risk of injury!

2.9 When using metal cutting attachments

STIHL recommends the use of original STIHL metal cutting attachments. These have been optimized for the machine and the user’s require‐ ments.
Metal cutting attachments rotate very fast, gener‐ ating forces acting on the attachments and on the cuttings.
Metal cutting attachments must be sharpened in regular intervals in accordance with the instruc‐ tions.
Unevenly sharpened metal cutting attachments generate an imbalance which may cause extreme loads on the machine – risk of break‐ age!
Dull or improperly sharpened cutting edges can put a higher load on the cutting attachment and increase the risk of injuryfrom cracked or broken parts.
After each contact of the metal cutting attach‐ ment with hard objects (e.g. stones, rocks, metal parts), check it for damage (e.g. tears and defor‐ mation). Burrs and other visible accumulated material must be removed since it may come loose at any time while the machine is running and then be ejected – risk of injury!
To reduce the above-specified risks involved in operating a metal cutting attachment, ensure that the diameter of your metal cutting attachment is not too big. Also, the attachment must not be too heavy. It must be made of high-quality materials and have a suitable geometry (shape, thickness).
A metal cutting attachment not made by STIHL must not have a different weight, thickness, shape or a larger diameter than the largest STIHL metal cutting attachment approved for this metal cutting attachment – risk of injury!

2.10 Vibrations

Prolonged use of the power tool may result in vibration-induced circulation problems in the hands (whitefinger disease).
No general recommendation can be given for the length of usage because it depends on several factors.
The period of usage is prolonged by:
Hand protection (wearing warm gloves)
Work breaks
The period of usage is shortened by:
Any personal tendency to suffer from poor cir‐
culation (symptoms: frequently cold fingers, tingling sensations). Low outside temperatures.
The force with which the handles are held (a
tight grip restricts circulation).
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English 2 Safety Precautions and Working Techniques
Continual and regular users should monitor closely the condition of their hands and fingers. If any of the above symptoms appear (e.g. tingling sensation in fingers), seek medical advice.

2.11 Maintenance and Repairs

Service the machine regularly. Do not attempt any maintenance or repair work not described in the instruction manual. Have all other work per‐ formed by a servicing dealer.
STIHL recommends that you have servicing and repair work carried out exclusively by an author‐ ized STIHL servicing dealer. STIHL dealers are regularly given the opportunity to attend training courses and are supplied with the necessary technical information.
Only use high-quality replacement parts in order to avoid the risk of accidents and damage to the machine. If you have any questions in this respect, consult a servicing dealer.
STIHL recommends the use of original STIHL replacement parts. They are specifically designed to match your model and meet your performance requirements.
To reduce the risk of injury from unintentional engine startup, always shut off the engine and disconnect the spark plug boot before performing any repairs, maintenance or cleaning work. – Exception: Carburetor and idle speed adjust‐ ments.
Do not turn the engine over on the starter with the spark plug boot or spark plug removed since there is otherwise a risk of fire from uncontained sparking.
To reduce the risk of fire, do not service or store your machine near open flames.
Check the fuel filler cap for leaks at regular inter‐ vals.
Use only a spark plug of the type approved by STIHL and make sure it is in good condition – see "Specifications".
Inspect the ignition lead (insulation in good con‐ dition, secure connection).
Check the condition of the muffler.
To reduce the risk of fire and damage to hearing, do not operate your machine if the muffler is damaged or missing. –
Do not touch a hot muffler since burn injury will result.
Vibration behavior is influenced by the condition of the AV elements – check the AV elements at regular intervals.

2.12 Symbols on Deflectors

An arrow on the deflector shows the correct direction of rotation of the cutting attachments.
Some of the following symbols are applied to the outside of the deflector to indicate the approved combination of cutting attachment and deflector.
Deflector may be used with mowing heads.
Deflector must not be used with mow‐ ing heads.
Deflector may be used with grass cut‐ ting blades.
Deflector must not be used with grass cutting blades.
Deflector may be used with brush kni‐ ves.
Deflector must not be used with brush knives.
Deflector must not be used with shredder blades.
Deflector must not be used with circu‐ lar saw blades.

2.13 Shoulder strap

► Use a shoulder strap.
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002BA049 KN
002BA135 KN
2 Safety Precautions and Working Techniques English
► With the engine running, attach the machine to
the shoulder strap.
Grass cutting blades must always be used in combination with a shoulder strap.

2.14 Mowing Head with Nylon Line

If one of the wear limit marks on the PolyCut mowing head is worn through (arrow): Do not continue using the mowing head. Install a new one. There is otherwise a risk of injury from thrown parts of the head.
It is important to follow the maintenance instruc‐ tions for the PolyCut mowing head.
The PolyCut can also be equipped with mowing line in place of the polymer blades.
The mowing head comes with instruction leaflets. Equip the mowing head with polymers blades or nylon line as described in the instruction leaflets.
WARNING
Never use wire in place of the nylon mowing line – risk of injury.
Nylon line achieves a soft cut for edging and trimming around trees, fence posts, etc. – less risk of damaging tree bark.
The mowing head comes with an instruction leaf‐ let. Refill the mowing head with nylon line as described in the instruction leaflet.
WARNING
To reduce the risk of serious injury, never use wire or metal-reinforced line in place of the nylon line.

2.16 Risk of Kickout (Blade Thrust) with Metal Cutting Attachments

WARNING
When using metal cutting attach‐ ments there is a risk of kickout when the rotating blade comes into contact with a solid object such as a tree trunk, branch, tree stump, rock or similar. The machine is thrown to the right or to the rear – opposite to the attachment's direction of rotation.

2.15 STIHL Polycut Mowing Head with Polymer Blades

For mowing unobstructed edges of meadows (without posts, fences, trees or similar obsta‐ cles).
Check the wear limit marks!
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English 2 Safety Precautions and Working Techniques
The risk of kickout is greatest when the black area of the rotating cutting attachment comes into contact with a solid object.

2.17 Grass Cutting Blade

Use for grass and weeds only – sweep the brushcutter in an arc like a scythe.
WARNING
Improper use may damage the grass cutting blade – risk of injury from thrown parts.
Resharpen the grass cutting blade according to instructions when it has dulled noticeably.
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8
9
11
16
17
18
19
20
21
22
19
17
18
22
22
21
10
1
2
3
5
6
14
12
13
15
4
0000086485_002
7
3 Approved Combinations of Cutting Attachment, Deflector, Handle an… English
3 Approved Combinations of Cutting Attachment, Deflector, Han‐
dle and Harness
Cutting attachment Deflector Handle Carrying strap

3.1 Permissible combinations

Choose the correct combination from the table depending on the cutting tool!
For safety reasons only the cutting attachments, deflector, handle and harness versions within one line of the table may be combined with one another. No other combinations are permitted because of the risk of accidents.
WARNING

3.2 Cutting attachments

3.2.1 Mowing heads
1 STIHL SuperCut 20-2
2 STIHL AutoCut 25-2 / AutoCut 27-2
3 STIHL AutoCut C 26-2
0458-593-8321-C 11
4 STIHL FixCut 31-2
5 STIHL DuroCut 20-2
6 STIHL PolyCut 20-3
7 STIHL PolyCut 28-2
3.2.2 Metal cutting tools
8 Grass cutting blade 230-2
9 Grass cutting blade 260-2
10 Grass cutting blade 230-4
11 Grass cutting blade 230-8
(230 mm dia.)
(260 mm dia.)
(230 mm dia.)
(230 mm dia.)
0208BA063 KN
A
1191BA005
3
6
7
4
1
2
5
1191BA006
5
1
B

English 4 Approved Power Tool Attachments

WARNING
Grass cutting blades of materials other than metal must not be used.

3.3 Deflectors

12 Deflector for mowing heads
13 Deflector with
14 Skirt and blade for mowing heads
15 Deflector without skirt and blade for metal
mowing heads

3.4 Handles

16 Loop handle
17 Loop handle with
18 Barrier bar
19 Bike handle

3.5 Shoulder straps

20 Shoulder strap can be used
21 Shoulder strap must be used
22 Full harness can be used
4 Approved Power Tool
► Mount the handlebar (1) on the drive tube (2)
about 40 cm/15 in (A) forward of the engine housing.
► Place the clamp (3) and handle support (4)
against the drive tube (2).
Attachments
The following STIHL attachments may be used with the basic power tool:
Attachment
1)
RG
Application Weeder

5 Mounting the Bike Handle

5.1 Mounting the Handlebar

Do not rotate the control handle (1) between unpacking and mounting it on the handlebar.
1)
use the barrier bar on machines with loop handle
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