Stihl SG 21 Instruction Manual

SG 21
Instruction Manual2 - 13
English
Contents
1 Guide to Using this Manual.........................2
2 Safety Precautions and Working Techni‐
ques............................................................ 2
3 Assembling the Unit.................................... 6
4 Controls.......................................................6
5 Preparing Unit for Operation....................... 7
6 Filling the Container.................................... 8
7 Spraying......................................................8
8 After Spraying............................................. 9
9 Storing the Machine.................................... 9
10 Inspection and Maintenance by User..........9
11 Maintenance and Care..............................11
12 Main Parts.................................................11
13 Specifications............................................11
14 Troubleshooting........................................ 12
15 Maintenance and Repairs......................... 12
16 Disposal.................................................... 12
17 EC Declaration of Conformity................... 12
Dear Customer,
It has been built using modern production techni‐ ques and comprehensive quality assurance. Every effort has been made to ensure your satis‐ faction and trouble-free use of the product.
Please contact your dealer or our sales company if you have any queries concerning this product.
Your
Dr. Nikolas Stihl

1 Guide to Using this Manual

1.1 Pictograms

All the pictograms attached to the machine are shown and explained in this manual.

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
This instruction manual covers a STIHL sprayer which is also referred to as the unit in the descriptions.
Special safety precautions must be observed when working with this sprayer.
It is important that you read the instruction manual before first use and keep it in a safe place for future reference. Non-observance of the instruction manual may result in seri‐ ous or even fatal injury.

2.1 General

Observe all applicable local safety regulations, standards and ordinances.
If you have not used this model before: Have your dealer or other experienced user show you how it is operated or attend a special course in its operation.
Minors should never be allowed to use this prod‐ uct.
Keep bystanders, especially children, and ani‐ mals away from the work area.
When the sprayer is not in use, put it in a place where it does not endanger others. Secure it against unauthorized use.
Original Instruction Manual
0000007179_009_GB
Printed on chlorine-free paper
Printing inks contain vegetable oils, paper can be recycled.
© ANDREAS STIHL AG & Co. KG 2022
0458-583-0121-B. VA0.B22.
2 0458-583-0121-B
2 Safety Precautions and Working Techniques English
The user is responsible for avoiding injury to third parties or damage to their property.
Do not lend or rent your sprayer without the instruction manual. Be sure that anyone using it understands the information contained in this manual.
Do not operate your sprayer if any of its compo‐ nents are damaged. Make sure that all compo‐ nents are properly sealed – no leaks.
Pressurize the tank only with the pump that is installed in the sprayer.
Operate the sprayer only if it is complete and properly assembled.
To operate this sprayer you must be rested, in good physical condition and mental health.
Do not operate the sprayer if you are under the influence of any substance (drugs, alcohol) which might impair vision, dexterity or judgment.

2.2 Intended use

The sprayer is suitable for spraying chemicals and other liquids to control pests and weeds. Typical areas of application are in fruit and vege‐ table growing, horticulture, plantations, grassland and the forestry industry.
Only use plant protection products that are spe‐ cifically approved for use in sprayers.
Do not use your sprayer for any other purpose because of the increased risk of accidents and damage to the sprayer. Never attempt to modify your sprayer in any way since this may result in accidents or damage to the sprayer.

2.3 Clothing and Equipment

Wear proper protective clothing and equipment when using, filling and cleaning the sprayer. Fol‐ low the chemical manufacturer's instructions with respect to protective equipment.
Clothing must be snug-fitting but allow complete freedom of movement.
Immediately change work clothes contaminated with plant control chemicals.
For some chemicals it is necessary to wear impermeable coveralls.
If you are spraying overhead, wear impermeable head covering.
Do not wear sandals or go barefoot.
Wear a suitable respirator.
Inhaling plant control chemicals may endanger your health. Always wear a suitable respirator to protect yourself against health risks and allergic reactions. Observe warnings in the directions for use of the plant protection product and all appli‐ cable local safety regulations, standards and ordinances.

2.4 Transport

Transporting in a vehicle:

2.5 Cleaning

Clean plastic surfaces with a cloth. Do not use aggressive detergents. They may damage the plastic.
Do not use a pressure washer to clean the unit. The solid jet of water may damage parts of the unit.

2.6 Accessories

Only use parts and accessories that are explicitly approved for this tool by STIHL or are technically identical. If you have any questions in this respect, consult a servicing dealer. Use only high quality parts and accessories in order to avoid the risk of accidents and damage to the tool.
STIHL recommends the use of genuine STIHL replacement parts. They are specifically designed to match your model and meet your performance requirements.
Wear impermeable safety boots with a non-slip sole which are resistant to plant control chemicals.
Wear impermeable gloves resistant to plant control chemicals.
WARNING
To reduce the risk of eye injuries, wear snug-fitting safety glasses in accordance with European Standard EN 166. Make sure the safety glasses are a good fit.
Properly secure the sprayer to prevent turn‐ over and damage. The tank must be de-pressurized, empty and clean.
0458-583-0121-B 3
English 2 Safety Precautions and Working Techniques
When filling from central water supply, do not
Never attempt to modify your 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 unauthorized attachments.

2.7 Handling Chemicals

Read the instructions supplied with the plant pro‐ tection chemical prior to use. Follow the instruc‐ tions with respect to mixing, using, personal pro‐ tection equipment, storage and disposal.
Observe legal requirements for handling plant protection chemicals.
Plant protection chemicals may contain substan‐ ces that are harmful to humans, animals, plants and the environment – risk of poisoning and risk of serious or fatal injuries!
Avoid contact with plant protection chemicals.
Plant protection chemicals may be used only by persons trained in their handling and the appro‐ priate first-aid measures.
Keep instructions or label of the plant protection chemical available at all times in order to inform the doctor about the chemical concerned in an emergency. In an emergency, follow the chemi‐ cal manufacturer's instructions provided or on the label. Observe manufacturer's safety data sheets.
2.7.1 Mixing plant protection chemicals and
Use plant protection chemicals only as specified by the manufacturer.
filling tank
Before filling the tank with chemicals, carry out a test with fresh water and check all parts of the sprayer for leaks. Never apply undiluted liquid concentrates of plant protection products. Mix the plant protection chemical and fill the tank outdoors only or in well-ventilated loca‐ tions. Only mix sufficient solution for the job in hand so that nothing is left over. Do not mix different plant protection products unless such a mixture is approved by the man‐ ufacturer. Mix different chemicals only in accordance with the manufacturer's instructions – incorrect mixtures may produce toxic fumes or explo‐ sive solutions. Stand the sprayer on a level surface – do not fill the tank above the maximum mark.
immerse the end of the hose in the solution – sudden low pressure in the system may cause the solution to be sucked back into the water supply. To reduce the risk of injury, do not fill the
sprayer while carrying it. Close the tank tightly after filling.
2.7.2 Application Work only in the open or in very well ventilated
locations, e.g. open greenhouses. Do not eat, drink or smoke while working with
plant control chemicals. Never blow through nozzles or other compo‐
nents by mouth. Do not spray in windy conditions.
Too high or too low a spray pressure or unfavor‐ able weather conditions can result in the wrong solution concentration. Overdosing may damage plants and the environment. Under-dosing may result in unsuccessful plant treatment.
To reduce the risk of damage to plants and the environment, do not operate the sprayer:
if pressure is too high or too low
in windy conditions
at temperatures above 30 °C in the shade
in direct sunlight
In order to reduce the risk of accidents and dam‐ age to the sprayer, never operate the sprayer with:
flammable liquids
viscous or sticky liquids
caustic or corrosive chemicals
liquids hotter than 30 °C
2.7.3 Storage During work breaks, do not leave the sprayer
in the hot sun or near any heat source. Do not store plant protection chemical in the
sprayer for longer than one day. Store and transport plant protection products
only in approved containers. Never store the plant protection products in
containers intended for foods, drinks or animal feed. Do not store plant protection products with
foods, drinks or animal feed. Keep plant protection products out of the
reach of children and animals. Store the sprayer empty and clean. It must not
be under pressure. Store plant protection products and power tool
in a place secured against unauthorized use.
4 0458-583-0121-B
0000-GXX-0010-A0 KN
2 Safety Precautions and Working Techniques English
Store the unit in a dry place protected from
frost.
2.7.4 Disposal
Dispose of plant protection chemicals in accord‐ ance with environmental requirements – follow instructions of chemical manufacturer.
Never dispose of residual plant protection prod‐ ucts or contaminated rinsing solutions in water‐ ways, drains, sewers, street gutters or manholes.
Dispose of residual chemicals and used con‐
tainers in accordance with local waste dis‐ posal regulations.

2.8 Holding and Controlling the Unit

2.9 During Operation

Never spray in the direction of bystanders – risk of injury.
Take special care in slippery conditions – damp, snow, ice, on slopes or uneven ground.
Watch out for obstacles: Be careful of refuse, tree stumps, roots and ditches which could cause you to trip or stumble.
To reduce the risk of accidents, take a break in good time to avoid tiredness or exhaustion.
Work calmly and carefully – in daylight conditions and only when visibility is good. Stay alert so as not to endanger others.
Never work on a ladder or any other insecure support.
When working in open ground and gardens take special care to avoid harming small animals.
To reduce the risk of electrocution, never work in the vicinity of live wires or power cables.
Always clean the sprayer before changing to a different plant protection product.

2.10 After Finishing Work

Check all parts of the unit for leaks.
After finishing work, thoroughly clean the unit and wash your hands, face and, if necessary, your clothes.
Keep other persons and animals away from the areas that have been sprayed and do not walk on them until the plant protection chemical has dried.

2.11 Maintenance and Repairs

Do not attempt any maintenance or repair work
not described in the instruction manual. Have all Put the strap over your left shoulder so that the unit hangs at your side. To ensure the unit can be quickly thrown off in an emergency, do not wear the strap across your chest.
Hold the sprayer with your right hand on the spray gun and your left hand on the pump han‐ dle.
Walk slowly forwards as you work – observe the nozzle outlet at all times – do not walk back‐ wards – risk of stumbling.
To reduce the risk of spillage and injury, hold the sprayer upright.
other work performed 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
unit. If you have any questions in this respect,
consult a servicing dealer.
STIHL recommends the use of genuine STIHL
replacement parts. They are specifically
0458-583-0121-B 5
1
1
2
3
0000-GXX-0011-A0 KN
2
4
0000-GXX-0012-A0 KN
6159BA004 KN
6159BA005 KN
6159BA006 KN
6159BA007 KN

English 3 Assembling the Unit

designed to match your model and meet your performance requirements.
Always clean and empty the tank and release pressure in the sprayer before carrying our any maintenance or repair work.
When cleaning the tank, tube and hose system, make sure that other persons are not endan‐ gered by escaping liquid – risk of injury.
3 Assembling the Unit
► Thread the ends of the strap through the
buckle.

4 Controls

Make yourself familiar with how the components
function before using your sprayer for the first
time.

4.1 Pump

Locking the pump handle
► Connect the hose (1) to the spray gun (2). ► Connect the hose (1) to the tank (3).
► Push the pump handle downwards and turn it
until it engages.
► Connect the wand (4) to the spray gun (2).

3.1 Shoulder Strap

► Pull the buckle off the shoulder strap.
Lock the pump handle:
during operation
when screwing the pump into the tank – rotate
clockwise to unscrew the pump from the tank – rotate
counterclockwise
Unlocking the pump handle
► Ease the housing outwards and thread the
strap through the openings from below.
6 0458-583-0121-B
1
6159BA008 KN
6159BA010 KN
0000-GXX-0013-A0 KN

5 Preparing Unit for Operation English

► Rotate the pump handle about a quarter turn
until it disengages and can be moved up and down freely.
Unlock the pump handle:
to pressurize the tank
Depressurize the tank

4.2 Tank

Pressurizing the tank
► Pull the piston manometer up all the way –
pressure is released – wait until tank is com‐ pletely depressurized.
Pressure must be released:
before filling the tank
after spraying
to drain and clean the tank
before carrying out maintenance work

4.3 Operating the Spray Gun

► Move the pump handle up and down several
times – the pressure in the tank rises.
The scale on the piston manometer (1) shows the pressure in the tank.
The higher the pressure in the tank, the higher the piston manometer rises – maximum operat‐ ing pressure is 3 bar (43.5 PSI).
If the maximum operating pressure is exceeded, the relief valve in the piston manometer releases the excess pressure.
► Pull the trigger – solution flows from nozzle
► Release the trigger – solution flow stops
5 Preparing Unit for Opera‐
tion

5.1 Visual Inspection

Do not operate your unit if any of its components
are damaged. It is particularly important to check
the tank and hose connection for leaks.

5.2 Checking for Leaks

Carry out test with the tank empty.
0458-583-0121-B 7
2
6159BA009 KN
1
0000-GXX-0014-A0 KN

English 6 Filling the Container

► Pressurize the tank – move the unlocked
pump handle (1) up and down several times until piston manometer (2) shows a pressure of 2 bar (29 PSI).
The pressure in the tank must not drop any more than 0.5 bar (7.25 PSI) within the next 30 minutes. ► Operate spray gun trigger – pressure must
escape.
► Release spray gun trigger – pressure must not
escape.
► Pull out piston manometer – pressure must
escape audibly.
► Completely depressurize the tank.
6 Filling the Container
The tank must not be under pressure. ► Unscrew the pump from the tank. ► Stand the tank securely on a level surface.
► Pour thoroughly mixed spray solution through
the opening (arrow) – do not exceed maximum capacity (check max mark on scale).
► Screw the pump into the tank.

7 Spraying

7.1 Visual Inspection

Do not operate your unit if any of its components
are damaged. It is particularly important to check
the tank and hose connection for leaks.

7.2 Spraying

► Build up pressure – move the pump handle up
and down several times until the piston man‐ ometer shows the required working pressure – see “Pressures / Spray Rates”
► Lock the pump handle.
Working pressures / spray rates – see "Specifi‐
cations".
8 0458-583-0121-B
0000-GXX-0010-A0 KN
6159BA015 KN
2
3
4
1
6159BA016 KN

8 After Spraying English

10 Inspection and Mainte‐
nance by User

10.1 Pump

Removing
► Unscrew the pump from the tank.
► Hold pump firmly by the cylinder barrel and
unlock the pump handle.
► Put the strap over your left shoulder so that
the unit hangs at your side.
► Operate the gun and always pay attention to
the optimal working pressure while spraying.
► If the working pressure drops more than
0.5 bar (7.25 PSI) , restore it by operating the pump handle.
8 After Spraying
► Completely depressurize the tank. ► Unscrew the pump from the tank. ► Drain the tank in a well-ventilated location –
collect remaining solution in a suitable con‐ tainer.
Dispose of any residual spray solution in accord‐ ance with environmental requirements – follow instructions of chemical manufacturer. ► Rinse the tank with clean water. ► Fill the tank with clean water, pump and spray
until the tank is empty and completely depres‐ surized.
► Wipe down the whole unit with a damp cloth.
► Pull the pump handle (1) out of the cylinder
barrel (2) as far as stop.
► Pull pump handle and rotate it counterclock‐
wise until the gland (3) is released from the cylinder barrel.
► Pull the piston rod (4) out of the cylinder bar‐
rel.

9 Storing the Machine

► Keep tank and pump separate for drying and
storage.
► Dry the unit and store it in a place protected
from direct sunlight and frost.
► Lubricate the piston cup seal and O-ring with a
food-safe grease.
0458-583-0121-B 9
6159BA017 KN
1
2
3
6159BA018 KN
1
2
1
3
0000-GXX-0015-A1
2
0000-GXX-0016-A0 KN
English 10 Inspection and Maintenance by User
Installing
► Pull the pump handle (1) upwards as far as
stop.
► Rotate the pump handle (1) clockwise until
gland (2) engages the cylinder barrel.
► Push the pump handle (1) downwards and
lock it in position.
► Screw the pump into the tank.

10.2 Cleaning the Filter and Nozzle

► Unscrew the hollow cone nozzle (1) with spin‐
ner insert (2) from the wand.
► Push gland (1) with piston cup seal (2) into the
cylinder barrel (3).
► Hold the gland (1) steady with your thumb and
push it into the cylinder barrel.
► Rinse out all parts under running water and
then reassemble.
10 0458-583-0121-B
5
5
9
6
7
1
2
3
0000-GXX-0017-A1
19
8
4
20
18
10
15
16
11
13
14
17
12

11 Maintenance and Care English

11 Maintenance and Care
The following intervals apply to normal operating conditions only. If your daily working times are lon‐ ger, shorten the specified intervals accordingly.
before starting work
weekly
monthly
every 12 months
if problem
if damaged
as required
after 50 refills
Complete unit Visual inspection
X
(condition, leaks) Clean X
Tank, hose system, wand Drain X
Clean X Nozzle Clean X X Filter Clean X X X
after finishing work or daily
Piston cup seal Lubricate with
X X X
grease O-ring Lubricate with
X X
grease Safety labels Replace X

12 Main Parts

4 Elbow
5 Union nut
6 Spray wand
7 Spray gun
8 Lever
9 Hose
10 Pump handle
11 Piston rod
12 Latch on pump cylinder
1 Hollow cone nozzle
2 Spinner insert
3 Filter
13 Gland
14 O-ring
15 Pump barrel
16 Piston cup seal
17 Valve disk
18 Piston manometer / relief valve
19 Tank
20 Shoulder strap

13 Specifications

13.1 Working Pressures / Spray Rates

Working pressure Flow rate with hollow cone
nozzle
0458-583-0121-B 11
000BA073 KN

English 14 Troubleshooting

1.5 bar (21.75 PSI) 0.49 l/min (29.9 cu.in/min)
2.0 bar (29.0 PSI) 0.56 l/min (34.2 cu.in/min)
3.0 bar (43.5 PSI) 0.69 l/min (42.1 cu.in/min)

13.2 Specifications

Working pressure, max.: 3 bar
(43,5 PSI)
Flow volume, max.: 1.0 l/min
(61 cu. in./min)
Solution capacity, max.: 3 l
Total capacity: 4.2 l
Operating temperature, max.: 30°C
Residual solution in tank: <0.04 l
Recoil force: <5 N
Dry weight: 1.2 kg
(0.8 US gals)
(1.1 US gals)
(86°F)
(1.4 fl.oz)
(1.1 lbf)
(2.6 lbs)
14 Troubleshooting
Before starting any service work, operate the sprayer until it is no longer under pressure – if pressure is not released, chemical may escape unexpectedly when working on the sprayer. After servicing, carry out test run with clean water.
Condition Cause Remedy Pumping action produces no
pressure
Jet only – spray not atomized Spinner insert in nozzle missing Fit spinner insert in the nozzle Nozzle does not spray – pres‐
sure in tank OK Liquid entering the pump Valve disk dirty or damaged Clean or replace valve disk Piston manometer indicates
no tank pressure; relief valve operates too soon

15 Maintenance and Repairs

Users of this machine may only carry out the maintenance and service work described in this user manual. All other repairs must be carried out 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.
When repairing the machine, only use replace‐ ment parts which have been approved by STIHL for this power tool or are technically identical. Only use high-quality replacement parts in order to avoid the risk of accidents and damage to the machine.
STIHL recommends the use of original STIHL replacement parts.
Original STIHL parts can be identified by the STIHL part number, the { logo and the STIHL parts symbol K (the symbol may appear alone on small parts).
Pump not tightened down properly Lock the pump handle and
O-ring on pump damaged Install new O-ring Piston cup seal damaged Install new piston cup seal
Nozzle / spinner insert and/or filter blocked
Piston manometer faulty Replace the sprayer.
tighten down the pump
Clean nozzle / spinner insert and/or filter

16 Disposal

Contact the local authorities or your STIHL serv‐ icing dealer for information on disposal.
Improper disposal can be harmful to health and pollute the environment.
► Take STIHL products including packaging to a
suitable collection point for recycling in accord‐ ance with local regulations.
► Do not dispose with domestic waste.
17 EC Declaration of Con‐
formity
ANDREAS STIHL AG & Co. KG Badstr. 115
12 0458-583-0121-B
17 EC Declaration of Conformity English
D-71336 Waiblingen
Germany
declare under our sole responsibility that
Designation: Sprayer Make: STIHL Series: SG 21 Serial identification number: 4255
conforms to the relevant specifications of Direc‐ tive 2006/42/EC.
Technical documents deposited at:
ANDREAS STIHL AG & Co. KG Produktzulassung
Done at Waiblingen, 03.02.2020
ANDREAS STIHL AG & Co. KG
pp
Dr. Jürgen Hoffmann
Director Product Certification & Regulatory Affairs
0458-583-0121-B 13
English 17 EC Declaration of Conformity
14 0458-583-0121-B
17 EC Declaration of Conformity English
0458-583-0121-B 15
www.stihl.com
*04585830121B*
0458-583-0121-B
*04585830121B*
0458-583-0121-B
Loading...