Stihl SG 51 User manual

SG 51, 71
Instruction Manual2 - 14

Contents
1 Guide to Using this Manual.........................2
2 Safety Precautions and Working Techni‐
ques............................................................ 2
3 Assembling the Unit.................................... 6
4 Harness.......................................................7
5 Controls.......................................................8
6 Filling the Container.................................... 9
7 Spraying......................................................9
8 After Spraying........................................... 10
9 Storing the Machine.................................. 10
10 Inspection and Maintenance by User........10
11 Maintenance and Care..............................11
12 Main Parts.................................................12
13 Specifications............................................12
14 Troubleshooting........................................ 13
15 Maintenance and Repairs......................... 13
16 Disposal.................................................... 13
17 EC Declaration of Conformity................... 14
18 UKCA Declaration of Conformity.............. 14
Dear Customer,
Thank you for choosing a quality engineered
STIHL product.
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.
English
2 0458-597-0121-C
© ANDREAS STIHL AG & Co. KG 2022
0458-597-0121-C. VA0.C22.
Printed on chlorine-free paper Printing inks contain vegetable oils, paper can be recycled.
Original Instruction Manual 0000006531_020_GB

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.
Wear impermeable safety boots with
a non-slip sole which are resistant to
plant control chemicals.
Do not wear sandals or go barefoot.
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.
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:
–Properly secure the sprayer to prevent turn‐
over and damage.
–The tank must be de-pressurized, empty and
clean.
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.
2 Safety Precautions and Working Techniques English
0458-597-0121-C 3

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
filling tank
Use plant protection chemicals only as specified
by the manufacturer.
–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.
–When filling from central water supply, do not
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 protection 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.
In order to reduce the risk of damage to the envi‐
ronment and plants, do not operate the sprayer:
–if pressure is too high or too low
–in windy conditions
–at temperatures above 40°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 40°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.
English 2 Safety Precautions and Working Techniques
4 0458-597-0121-C

–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
0000012325_002
Carry the unit on your back with both harness
straps – do not hang it over one shoulder.
Walk slowly forwards as you work – observe the
nozzle outlet at all times – do not walk back‐
wards – risk of stumbling.
Hold the unit upright. To avoid the risk of chemi‐
cal leaking from the tank and causing injury, do
not bend forwards.
271BA003 KN
For emergencies: Practice quickly opening the
fastener on the waist belt (SG 71 only), loosen‐
ing the shoulder straps and setting down the
unit. To avoid damage, do not throw the unit to
the ground when practicing.
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
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
2 Safety Precautions and Working Techniques English
0458-597-0121-C 5

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
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
The small hardware required for assembly is in
the tank.
3.1 Connecting Hose to Unit
1
0000-GXX-2198-A0
2
3
► Push the union nut (1) over the hose (2).
► Push the hose (2) behind the shaft and onto
the elbow connector (3).
► Slip the union nut (1) onto the elbow connector
(3) and tighten it down firmly by hand.
3.2 Mounting the Spray Gun
1
0000-GXX-2199-A0
3
2
► Push the union nut (1) over the hose (2).
► Push the hose (2) onto the connector on the
gun (3).
► Tighten down the union nut (1) by hand.
0000-GXX-2204-A0
35
4
► Push the spray wand (4) into the connector on
the gun (3).
► Tighten down the union nut (5) by hand.
3.3 Mounting the Lever
ABC
1
2
0000-GXX-2200-A0
The length of the handle (1) can be adjusted (A,
B, C) to suit the operator.
► Push the handle (1) into the lever (2).
0000-GXX-2201-A0
23
The lever can be mounted on the left or right of
the unit.
► Push the lever (2) into the shaft (3).
English 3 Assembling the Unit
6 0458-597-0121-C

0000-GXX-2202-A0
2
► Swing the lever (2) upwards.
► Lay the unit on its side.
4
0000-GXX-2203-A0
2A
B
C
5
The position of the lever (2) can varied to suit the
operator’s size.
► Set the distance (A, B or C) as required.
► Insert retaining pin (4) in the hole in the shaft
(5) to secure the lever (2).
4 Harness
0000012326_002
► Adjust the harness straps so that the back‐
plate fits snugly and securely against your
back
4.1 Adjusting the Height of Har‐
ness Straps
The harness straps can be adjusted to suit your
physique.
8014BA008 AS
1
1
2
2
► Use a screwdriver to pry the pin (1) out of the
backplate
► Remove the pin (1) and pull out the ends of
the harness straps (2)
► Fit the ends of the harness straps (2) in the
lower position
► Insert the pin (1) and engage it in the back‐
plate
4.2 Adjusting the Harness Straps
The SG 71 is equipped with a waist/hip belt (not
available in all countries).
4 Harness English
0458-597-0121-C 7

A
B
271BA047 KN
A Pull the ends of the straps downward to
tighten the harness
B Lift the tabs of the adjusters to loosen the
straps
C
D
271BA048 KN
C Close and lock the quick-release fastener by
pushing it together
D Squeeze the hooks to open the quick-release
fastener
5 Controls
Make yourself familiar with how the controls
function before using your sprayer for the first
time.
5.1 Lever
Pressurizing the tank
8014BA014 AS
► Operate the pump lever slowly and steadily
with the gun closed – several strokes are
required to build up pressure.
Transport position
8014BA023 AS
► Move the pump lever to upright position until it
engages.
5.2 Cap
8014BA019 AS
3
2
1
English 5 Controls
8 0458-597-0121-C

There are three measuring cups in the cap. They
can be used to prepare the plant protection solu‐
tion.
1 5 ml (0.2 fl.oz)
2 10 ml (0.3 fl.oz)
3 25 ml (0.8 fl.oz)
5.3 Spray Gun
Unlocking / locking spray gun
1
2
0000011028_002
► Push locking lever (1) upwards – the trig‐
ger (2) is unlocked and can be operated.
1
2
0000011015_002
► Push the locking lever (1) downwards – the
trigger (2) is locked to reduce the risk of acci‐
dental operation.
6 Filling the Container
Before filling the tank with chemicals, carry out a
test with fresh water and check all parts of the
sprayer for leaks.
max
8014BA013 AS
► Stand the sprayer on a level surface.
► Remove the cap from the tank.
8014BA012 AS
1
2
► Check the O-ring (1) in the cap (2).
It must be in good condition.
max
8014BA011 AS
► Fill up with thoroughly mixed plant protection
solution – do not overfill (no further than max.
mark – arrow).
8014BA021 AS
► Fit the cap and tighten it down firmly with both
hands.
7 Spraying
► Carry the unit on your back with both harness
straps – do not hang it over one shoulder.
► Operate the pump lever slowly and steadily
with the gun closed – several strokes are
required to build up pressure.
► 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.
6 Filling the Container English
0458-597-0121-C 9

Working pressures / spray rates – see "Specifi‐
cations".
8 After Spraying
► Empty the container in a well ventilated loca‐
tion.
► Rinse the container with clean water.
► Fill the container with clean water.
► Fit the cap on the container and tighten it
down firmly.
► Pressurize the container and continue spray‐
ing until the container is empty and no longer
under pressure.
9 Storing the Machine
► Secure the unit against unauthorized use.
► Dry the unit and store it in a place protected
from direct sunlight and frost.
10 Inspection and Mainte‐
nance by User
10.1 Greasing the piston packing
Removal
8014BA043 KK
► Unscrew the pump tube from the container
The pump cover can be opened using a 1/2"
ratchet wrench.
8014BA026 AS
► Grease piston packing with a lubricating
grease
Installing
8014BA044 KK
► Screw the pump tube into the container until
the lug (arrow) engages in the toothing.
10.2 Oil pump rod
8014BA041 KK
► Apply a few drops of resin-free oil to the pump
rod
10.3 Greasing the bearing of the
pump lever
8014BA042 KK
► Grease the bearing of the pump lever
English 8 After Spraying
10 0458-597-0121-C

10.4 Cleaning the filter
6159BA025 KN
1
2
► Unscrew the handle (1) from the spray gun
and take out the filter (2)
6159BA026 KN
► Rinse out the filter under running water
10.5 Cleaning the nozzle
2
6159BA032 ST
1
► Unscrew the hollow-cone nozzle (1) with swirl
insert (2)
6159BA033 ST
► Rinse out all parts under running water and
then reassemble
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
after finishing work or daily
weekly
monthly
every 12 months
if problem
if damaged
as required
after 50 refills
Complete unit Visual inspection
(condition, leaks)
X
Clean X
11 Maintenance and Care English
0458-597-0121-C 11

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
after finishing work or daily
weekly
monthly
every 12 months
if problem
if damaged
as required
after 50 refills
O-ring in container's cap Visual inspection
(condition, leaks)
X
Solution container, hose
system, wand
Drain X
Clean X
Nozzle Clean X X
Filter in spray gun Clean X X X
Piston cup seal Lubricate with
grease
X X X
Pump rod Lubricate with oil X X
Pump lever bearing Lubricate with
grease
X X
Safety labels Replace X
12 Main Parts
8014BA036 AS8014BA033 AS
1
2
14
15
56
4
12
13
3
9
10
11
16
17 #
8
7
1 Backplate
2 Harness
3 Hose
4 Filter
5 Spray gun
6 Spray wand
7 Spinner insert
8 Hollow cone nozzle
9 Container cap
10 Gasket
11 Strainer
12 Tank
13 Lever
14 Handle
15 Pump barrel
16 Piston cup seal
17 Retaining pin
# Serial number
13 Specifications
13.1 Working Pressures / Spray
Rates
Working pressure Flow rate with hollow
cone nozzle
1.0 bar 0.39 l/min
1.5 bar 0.49 l/min
2.0 bar 0.56 l/min
3.0 bar 0.69 l/min
4.0 bar 0.81 l/min
6.0 bar 0.96 l/min
English 12 Main Parts
12 0458-597-0121-C

13.2 SG 51 Specifications
Working pressure, max.: 6 bar
Flow volume, max.: 1.4 l/min
Solution capacity, max.: 12 l
Operating temperature, max.: 40°C
Residual solution in tank: <0.25 l
Recoil force: <20 N
Dry weight: 4.5 kg
13.3 SG 71 Specifications
Working pressure, max.: 6 bar
Flow volume, max.: 1.4 l/min
Solution capacity, max.: 18 l
Operating temperature, max.: 40°C
Residual solution in tank: <0.27 l
Recoil force: <20 N
Dry weight: 4.8 kg
14 Troubleshooting
Before starting, spray the unit empty until the pressure has been completely relieved - when working
on the unit, liquid may splash out uncontrollably if the pressure is not released.
After the work, carry out a test run with clear water.
Fault Cause Remedy
Pressure gauge does not
show the container pressure
Pressure gauge defective Replace pressure gauge
Pumping action produces no
pressure. Lever is remarkably
easy to operate
Pump tube damaged Replace pump tube
Valve disc damaged Replace valve discs 1)
Piston packing damaged Replace piston packing 1)
Lever blocked or difficult to
move down
Piston packing not greased Grease piston packing
Nozzle / swirl insert / filter blocked Clean nozzle / swirl insert / filter
Tool only sprays when pump‐
ing
Pressure vessel fully filled with liq‐
uid
Pump the unit completely empty.
Repeat after 5 fillings at the lat‐
est
Nozzle does not spray – pres‐
sure in unit OK
Nozzle / swirl insert / filter blocked Clean nozzle / swirl insert / filter
Liquid drips from the nozzle Nozzle / swirl insert / filter blocked Clean nozzle / swirl insert / filter
Jet only – no atomization Swirl insert on the nozzle missing Insert swirl insert into nozzle
Nozzle fouled Cleaning the nozzle
1)STIHL recommends STIHL servicing dealers
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).
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.
000BA073 KN
► Take STIHL products including packaging to a
suitable collection point for recycling in accord‐
ance with local regulations.
14 Troubleshooting English
0458-597-0121-C 13

► Do not dispose with domestic waste.
17 EC Declaration of Con‐
formity
ANDREAS STIHL AG & Co. KG
Badstr. 115
D-71336 Waiblingen
Germany
declares under our sole responsibility that
Designation: Sprayer
Make: STIHL
Series: SG 51, SG 71
Serial identification number: 4255
conforms to the relevant provisions of Directive
2006/42/EC and has been developed and manu‐
factured in compliance with the following stand‐
ards in the versions valid on the date of produc‐
tion:
DIN EN ISO 19932‑1: 2013,
DIN EN ISO 19932‑2: 2014
Technical documents deposited at:
ANDREAS STIHL AG & Co. KG
Produktzulassung
Waiblingen, 15.07.2021
ANDREAS STIHL AG & Co. KG
pp
Dr. Jürgen Hoffmann
Director Product Certification & Regulatory
Affairs
18 UKCA Declaration of Con‐
formity
ANDREAS STIHL AG & Co. KG
Badstr. 115
D-71336 Waiblingen
Germany
declare under our sole responsibility that
Category: Sprayer
Manufacturer's brand: STIHL
Series: SG 51, SG 71
Serial identification number: 4255
conforms to the relevant provisions of UK regula‐
tions Supply of Machinery (Safety) Regulations
2008 and has been manufactured in compliance
with the following standards in the versions valid
on the date of production:
DIN EN ISO 19932‑1: 2013,
DIN EN ISO 19932‑2: 2014
Technical documents deposited at:
ANDREAS STIHL AG & Co. KG
Done at Waiblingen, 15.07.2021
ANDREAS STIHL AG & Co. KG
pp
Dr. Jürgen Hoffmann
Director Product Certification & Regulatory
Affairs
English 17 EC Declaration of Conformity
14 0458-597-0121-C

18 UKCA Declaration of Conformity English
0458-597-0121-C 15

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