Stihl 45 C Owners Manual

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19
Checking the spark plug
NClean the spark plug if it is dirty
NCheck the electrode gap (A) and 
readjust if necessary – see 
"Specifications"
NUse only resistor type spark plugs of 
the approved range
Correct the problems that have caused 
fouling of the spark plug:
–too much oil in fuel mix,
–dirty air filter,
–unfavorable running conditions, e.g. 
operating at part throttle.
WARNING
To reduce the risk of fire and burn injury, 
use only spark plugs authorized by 
STIHL. Always press the spark plug 
boot (1) snugly onto the spark plug 
terminal (2).
Do not use a spark plug with a 
detachable SAE adapter terminal (3). 
Arcing may occur that could ignite 
combustible fumes and cause a fire. 
This can result in serious injuries or 
damage to property. 
NOnly use resistor type spark plugs 
with solid, non-threaded terminals
Installing the spark plug
NFit the spark plug by hand and 
screw it in
NTighten spark plug with combination 
wrench
NPress the spark plug boot firmly 
onto the spark plug
000BA039 KNA
2
0000-GXX-1830-A0
3
1 
						

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20 If engine running behavior is 
unsatisfactory even though the air filter 
is clean and the carburetor is properly 
adjusted, the cause may be the muffler.
Have the muffler checked for 
contamination (carbonization) by your 
servicing dealer.
STIHL recommends that you have 
servicing and repair work carried out 
exclusively by an authorized STIHL 
servicing dealer.Use STIHL gear lubricant for hedge 
trimmers (special accessory) to lubricate 
the blade drive gear.
After about 50 hours of operation:
NRemove the screw plug (1) from the 
gearbox.
NScrew the tube of grease (2) into the 
filler hole.
NSqueeze up to 1/4 oz (5 g) grease 
into the gearbox.
NOTICE
Do not completely fill the gearbox with 
grease.NRemove the tube of grease (2).
NRefit the filler plug and tighten it 
down firmly.
Engine Running BehaviorLubricating the Gearbox
1
2
253BA025 KN 
						

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21 For periods of 3 months or longer
NDrain and clean the fuel tank in a 
well ventilated area.
NDispose of fuel properly in 
accordance with local 
environmental requirements.
NRun the engine until the carburetor 
is dry – this helps prevent the 
carburetor diaphragms sticking 
together.
NClean the cutting blades, check 
condition and spray with STIHL 
resin solvent.
NFit the blade scabbard.
NThoroughly clean the machine – pay 
special attention to the cylinder fins 
and air filter.
NStore the machine in a dry and safe 
location (use the ring integrated in 
the rear handle) out of the reach of 
children and other unauthorized 
persons.When cutting performance and behavior 
begin to deteriorate, i.e. blades 
frequently snag on branches: 
Resharpen the cutting blades.
It is best to have the cutting blades 
resharpened by a dealer on a workshop 
sharpener. STIHL recommends a STIHL 
servicing dealer.
It is also possible to use a flat crosscut 
sharpening file. Hold the sharpening file 
at the prescribed angle (see 
"Specifications").
NOnly sharpen the cutting edge – do 
not file blunt projecting parts of the 
cutting blade or the cutting blade 
guard (see "Main Parts and 
Controls")
NAlways file towards the cutting 
edge.
NThe file only sharpens on the 
forward stroke – lift it off the blade 
on the backstroke.
NUse a whetstone to remove burr 
from cutting edge.
NRemove as little material as 
possible.
NAfter sharpening, clean away filing 
or grinding dust and then spray the 
cutting blades with STIHL resin 
solvent.
NOTICE
Do not operate your machine with dull or 
damaged cutting blades. This may 
cause overload and will give 
unsatisfactory cutting results.
Maintenance Work
STIHL recommends that you have 
servicing and repair work carried out 
exclusively by an authorized STIHL 
servicing dealer.
Fuel Pickup Body in Tank
NHave the pickup body in the fuel 
tank replaced every year.
Spark Arrestor in Muffler
NIf the engine is low on power, have 
your dealer check the spark arrestor 
(country-specific option) in the 
muffler. 
Storing the MachineSharpening InstructionsInspections and Maintenance 
by Dealer 
						

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22
Maintenance and Care
The following intervals apply to normal operating conditions only. If your daily work-
ing time is longer or operating conditions are difficult (very dusty work area, etc.), 
shorten the specified intervals accordingly.
before starting work
after finishing work or daily
after each refueling stop
weekly
monthly
every 12 months
if problem
if damaged
as required
Complete machineVisual inspection (condition, leaks)XX
CleanX
Control handle Check operationXX
Air filterCleanXX
ReplaceX
Manual fuel pump (if fitted)CheckX
Have repaired by servicing dealer
1)X
Pickup body in fuel tankHave checked by servicing dealer
1)X
Have replaced by servicing dealer
1)XXX
Fuel tank CleanXX
CarburetorCheck idle adjustmentXX
Readjust idleX
Spark plugReadjust electrode gapX
Replace after every 100 operating hours
Cooling inletsVisual inspectionX
CleanX
Spark arresting screen
2) in mufflerHave checked by servicing dealer
1)X
Have cleaned or replaced by servicing 
dealer
1)X
All accessible screws and nuts (not adjust-
ing screws)RetightenX
Antivibration elementsVisual inspectionX
Have replaced by servicing dealer
1)XX 
						

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23
Cutting bladesCleanX
SharpenX
Visual inspectionX
Have replaced by servicing dealer
1)X
Gearbox lubricationCheck and replenish after every 50 
hours of operation
Safety labels ReplaceX
1)STIHL recommends an authorized STIHL servicing dealer.2)not in all versions, market-specific The following intervals apply to normal operating conditions only. If your daily work-
ing time is longer or operating conditions are difficult (very dusty work area, etc.), 
shorten the specified intervals accordingly.
before starting work
after finishing work or daily
after each refueling stop
weekly
monthly
every 12 months
if problem
if damaged
as required 
						

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241Rear Handle
2Throttle Trigger Lockout
3Throttle Trigger
4Fuel Tank
5Air Filter Cover
6Carburetor Adjusting Screws
7Screw Plug
8Front Handle
9Stop Switch
10Starting Throttle Lock
11Starter Grip
12Fuel Filler Cap
13Muffler
14Spark Plug Boot
15Manual Fuel Pump
16Choke Lever
17Cutting Blade Guard
18Cutting Blades
19Blade Scabbard
Main Parts
7
18
17
1913
14
15
16
12
9
10
11
8
63
2
145
253BA026 KN 
						

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25
Definitions
1. Rear Handle
The support handle for the hand, 
located at or toward the rear of the 
hedge trimmer.
2. Throttle Trigger Lockout
Must be depressed before the 
throttle trigger can be activated.
3. Throttle Trigger
Controls the speed of the engine.
4. Fuel Tank
For fuel and oil mixture.
5. Air Filter Cover
Covers and protects the air filter 
element.
6. Carburetor Adjusting Screws
For tuning the carburetor.
7. Screw Plug
Seals filler opening for gearbox 
grease.
8. Front Handle
Handle bar for the hand at front of 
hedge trimmer.
9. Stop Switch
Switches the engine's ignition off 
and stops the engine.
10. Starting Throttle Lock
Keeps the throttle partially open 
during starting.
11. Starter Grip
The grip of the pull starter, for 
starting the engine.
12. Fuel Filler Cap
For closing the fuel tank.13. Muffler
Reduces engine exhaust noises 
and diverts exhaust gases away 
from operator.
14. Spark Plug Boot
Connects the spark plug with the 
ignition lead.
15. Manual Fuel Pump
Provides additional fuel feed for a 
cold start.
16. Choke Lever
Eases engine starting by enriching 
mixture.
17. Cutting Blade Guard
Helps to reduce the risk of operator 
contact by the cutter blade.
18. Cutting Blades
Steel blades for cutting hedges and 
shrubs.
19. Blade Scabbard
Covers cutting blades when hedge 
trimmer is not in use.
EPA / CEPA
The Emission Compliance Period 
referred to on the Emissions 
Compliance Label indicates the number 
of operating hours for which the engine 
has been shown to meet Federal 
emission requirements.
Category
CARB
The Emission Compliance Period used 
on the CARB-Air Index Label indicates 
the terms:
Engine
STIHL single cylinder two-stroke engine
Specifications
A = 300 hours
B = 125 hours
C= 50hours
Extended = 300 hours
Intermediate = 125 hours
Moderate = 50 hours
Displacement: 27.2 cc 
(1.66 cu.in)
Bore: 34 mm (1.34 in)
Stroke: 30 mm (1.18 in)
Engine power to 
ISO 7293:0.75 kW (1 bhp) 
at 8,500 rpm
Idle speed: 2,800 rpm
Cut-off speed: 10,300 rpm 
						

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26
Ignition System
Electronic (breakerless) magneto 
ignition
Fuel System
All position diaphragm carburetor with 
integral fuel pump
Weight
Cutting bladesUsers of this unit should carry out only 
the maintenance operations described 
in this manual. STIHL recommends that 
other repair work be performed only by 
authorized STIHL servicing dealers 
using genuine STIHL replacement parts.
Genuine STIHL parts can be identified 
by the STIHL part number, the 
{ logo and, in some cases, by 
the STIHL parts symbol K. The 
symbol may appear alone on small 
parts.
For repairs of any component of this 
unit’s air emissions control system, 
please refer to the air emissions 
systems warranty in this manual.Observe all country-specific waste 
disposal rules and regulations.
STIHL products must not be thrown in 
the garbage can. Take the product, 
accessories and packaging to an 
approved disposal site for environment-
friendly recycling.
Contact your STIHL servicing dealer for 
the latest information on waste disposal. Spark plug (resistor 
type):Bosch WSR 6 F, 
NGK BPMR 7 A
Electrode gap: 0.5 mm 
(0.020 in)
Fuel tank capacity: 0.225 l (7.6 fl.oz)
complete with cutting attachment, dry
450 mm (18 in) 
blade: 4.7 kg (10.4 lbs)
600 mm (24 in) 
blade: 5.0 kg (11 lbs)
Sharpening angle to 
horizontal: 35°
Maintenance and RepairsDisposal
000BA073 KN 
						

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27 STIHL Incorporated Limited Warranty 
Policy
This product is sold subject to the STIHL 
Incorporated Limited Warranty Policy, 
available at 
http://www.stihlusa.com/warranty.html.
It can also be obtained from your 
authorized STIHL dealer or by calling 
1-800-GO-STIHL (1-800-467-8445).Not for California
Your Warranty Rights and Obligations
The U.S. Environmental Protection 
Agency (EPA) and STIHL Incorporated 
are pleased to explain the Emission 
Control System Warranty on your 
equipment type engine. In the U.S. new 
1997 and later model year small off-road 
equipment engines must be designed, 
built and equipped, at the time of sale, to 
meet the U.S. EPA regulations for small 
non road engines. The equipment 
engine must be free from defects in 
materials and workmanship which 
cause it to fail to conform with U.S. EPA 
standards for the first two years of 
engine use from the date of sale to the 
ultimate purchaser.
STIHL Incorporated must warrant the 
emission control system on your small 
off-road engine for the period of time 
listed below provided there has been no 
abuse, neglect or improper maintenance 
of your small off-road equipment engine.
Your emission control system includes 
parts such as the carburetor and the 
ignition system. Also included may be 
hoses, and connectors and other 
emission-related assemblies.
Where a warrantable condition exists, 
STIHL Incorporated will repair your 
small off-road equipment engine at no 
cost to you, including diagnosis (if the 
diagnostic work is performed at an 
authorized dealer), parts, and labor.Manufacturer's Warranty Coverage
In the U.S., 1997 and later model year 
small off-road equipment engines are 
w a r r a n t e d  f o r  t w o  y e a r s .  I f  a n y  e m i s s i o n -
related part on your engine is defective, 
the part will be repaired or replaced by 
STIHL Incorporated free of charge.
Owner's Warranty Responsibilities
As the small off-road equipment engine 
owner, you are responsible for the 
performance of the required 
maintenance listed in your instruction 
manual. STIHL Incorporated 
recommends that you retain all receipts 
covering maintenance on your small off-
road equipment engine, but STIHL 
Incorporated cannot deny warranty 
solely for the lack of receipts or for your 
failure to ensure the performance of all 
scheduled maintenance.
Any replacement part or service that is 
equivalent in performance and durability 
may be used in non-warranty 
maintenance or repairs, and shall not 
reduce the warranty obligations of the 
engine manufacturer.
As the small off-road equipment engine 
owner, you should be aware, however, 
that STIHL Incorporated may deny you 
warranty coverage if your small off-road 
equipment engine or a part has failed 
due to abuse, neglect, improper 
maintenance or unapproved 
modifications.
You are responsible for presenting your 
small off-road equipment engine to a 
STIHL service center as soon as a 
problem exists. The warranty repairs will 
be completed in a reasonable amount of 
time, not to exceed 30 days.
Limited WarrantySTIHL Incorporated Federal 
Emission Control Warranty 
Statement 
						

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28 If you have any questions regarding your 
warranty rights and responsibilities, 
please contact a STIHL customer 
service representative at 1-800-467-
8445 or you can write to
STIHL Inc.,
536 Viking Drive, P.O. Box 2015,
Virginia Beach, VA 23450-2015
www.stihlusa.com
Coverage by STIHL Incorporated
STIHL Incorporated warrants to the 
ultimate purchaser and each 
subsequent purchaser that your small 
off-road equipment engine will be 
designed, built and equipped, at the time 
of sale, to meet all applicable emissions 
regulations. STIHL Incorporated also 
warrants to the initial purchaser and 
each subsequent purchaser that your 
engine is free from defects in materials 
and workmanship which cause the 
engine to fail to conform with applicable 
emissions regulations for a period of two 
years.
Warranty Period
The warranty period will begin on the 
date the utility equipment engine is 
purchased by the initial purchaser. 
Product registration is recommended, 
so that STIHL has a means to contact 
you if there ever is a need to 
communicate repair or recall information 
about your product, but it is not required 
in order to obtain warranty service.
If any emission-related part on your 
engine is defective, the part will be 
replaced by STIHL Incorporated at no 
cost to the owner. Any warranted part 
which is not scheduled for replacement 
as required maintenance, or which is scheduled only for regular inspection to 
the effect of "repair or replace as 
necessary" will be warranted for the 
warranty period. Any warranted part 
which is scheduled for replacement as 
required maintenance will be warranted 
for the period of time up to the first 
scheduled replacement point for that 
part.
Diagnosis
You, as the owner, shall not be charged 
for diagnostic labor which leads to the 
determination that a warranted 
emissions part is defective. However, if 
you claim warranty for an emissions 
component and the machine is tested as 
non-defective, STIHL Incorporated will 
charge you for the cost of the emission 
test. Mechanical diagnostic work will be 
performed at an authorized STIHL 
servicing dealer. Emission test may be 
performed either at STIHL Incorporated 
or at any independent test laboratory.
Warranty Work
STIHL Incorporated shall remedy 
warranty defects at any authorized 
STIHL servicing dealer or warranty 
station. Any such work shall be free of 
charge to the owner if it is determined 
that an emissions warranted part is 
defective.
Any manufacturer-approved or 
equivalent replacement part may be 
used for any warranty maintenance or 
repairs on emission-related parts and 
must be provided without charge to the 
owner. STIHL Incorporated is liable for 
damages to other engine components 
caused by the failure of a warranted part 
still under warranty.The following list specifically defines the 
emission-related warranted parts:
–Air Filter
–Carburetor (if applicable)
–Fuel Pump
–Choke (Cold Start Enrichment 
System) (if applicable)
–Control Linkages
–Intake Manifold
–
Magneto or Electronic Ignition 
System (Ignition Module or 
Electronic Control Unit)
–Flywheel
–Spark Plug
–Solenoid Valve (if applicable)
–Injection Valve (if applicable)
–Injection Pump (if applicable)
–Throttle Housing (if applicable)
–Cylinder
–Muffler
–Catalytic Converter (if applicable)
–Fuel Tank
–Fuel Cap
–Fuel Line
–Fuel Line Fittings
–Clamps
–Fasteners
Where to make a Claim for Warranty 
Service
Bring the product to any authorized 
STIHL servicing dealer.