Stihl Hs 81 R Manual

HS 81 R, HS 81 RC, HS 81 T, HS 81 TCEnglish
9 Operating Instructions
In the event of an emergency, switch off 
the engine immediately – move the slide 
control / stop switch to 0 or STOP.Accelerating the engine while the blades 
are blocked increases the load and will 
cause the clutch to slip continuously. 
This may result in overheating and 
damage to important components (e.g. 
clutch, polymer housing components) – 
which can then increase the risk of injury 
from the blades moving while the engine...

HS 81 R, HS 81 RC, HS 81 T, HS 81 TC English
10 After Finishing Work
Always clean dust and dirt off the 
machine – do not use any grease 
solvents for this purpose.
Spray the blades with STIHL resin 
solvent. Start and run the engine briefly 
so that the solvent is evenly distributed.MAINTENANCE, REPAIR AND 
STORING
Maintenance, replacement, or repair 
of the emission control devices and 
systems may be performed by any 
nonroad engine repair establishment 
or individual. However, if you make a 
warranty...

HS 81 R, HS 81 RC, HS 81 T, HS 81 TCEnglish
11 Keep the cutting tool sharp. Tighten all 
nuts, bolts and screws, except the 
carburetor adjustment screws, after 
each use.
Do not clean your machine with a 
pressure washer. The solid jet of water 
may damage parts of the machine.
Store the power tool in a dry and high or 
locked location out of reach of children.
Before storing for longer than a few 
days, always empty the fuel tank. See 
chapter Storing the machine in this 
manual.
HS 81 R
The HS 81 R is...

HS 81 R, HS 81 RC, HS 81 T, HS 81 TC English
12
Working Technique
Vertical Cut
Swing the cutting blade from the bottom 
upwards in an arc – lower the nose of the 
blade, move along the hedge and then 
swing the blade up again in an arc.
Any working position above head height 
is tiring. To minimize the risk of 
accidents, work in such positions for 
short periods only.Horizontal Cut
Hold the cutter bar at an angle of 0° to 
10° as you swing the hedge trimmer 
horizontally.
Swing the cutting blade in an...

HS 81 R, HS 81 RC, HS 81 T, HS 81 TCEnglish
13 The idle speed and maximum speed of 
the engine change if you switch from a 
fuel with a certain ethanol content to 
another fuel with a much higher or lower 
ethanol content.
This problem can be avoided by always 
using fuel with the same ethanol 
content.
Use only STIHL two-stroke engine oil or 
equivalent high-quality two-stroke 
engine oils that are designed for use 
only in air cooled two-cycle engines.
We recommend STIHL HP Ultra 2-Cycle 
Engine Oil...

HS 81 R, HS 81 RC, HS 81 T, HS 81 TC English
14
Opening the cap
NSwing the grip 90° to the upright 
position.
NTurn the cap counterclockwise
(about a quarter turn).
NRemove the filler cap.
Fueling
Take care not to spill fuel while fueling 
and do not overfill the tank.
Closing the cap
NInsert the cap in the opening – with 
the grip upright – the marks must 
line up.
NTurn cap clockwise as far as stop 
(about a quarter turn).
NFold the grip down so that it is flush 
with the top of the cap.
If the grip...

HS 81 R, HS 81 RC, HS 81 T, HS 81 TCEnglish
15 The rear handle can be turned through 
90° to the left or right for better control 
and comfort in all cutting situations.
NLet go of the throttle trigger. Do not 
open the throttle.
NRelease the lock (1).
NTurn the handle (2) to the required 
position and re-engage the lock (1).
The throttle trigger may be used again 
when the handle is locked in position.
Do not operate the throttle while the 
handle lock is released. Never release 
the lock while you are...

HS 81 R, HS 81 RC, HS 81 T, HS 81 TC English
16 Version without Easy2Start
NPull the starter grip slowly until you 
feel it engage and then give it a brisk 
strong pull.
NDo not let the starter grip snap back. 
Guide it slowly back into the housing 
so that the starter rope can rewind 
properly.
Version with Easy2Start
NPull the starter grip steadily.
When the engine begins to fire:
NMove the choke lever to e and 
continue cranking.
As soon as the engine runs
NOpen the throttle wide – the starting...

HS 81 R, HS 81 RC, HS 81 T, HS 81 TCEnglish
17 Paper filter
NTurn the choke lever to g
NTake out the screw (1).
NRemove the filter cover (2).
NClean away loose dirt from around 
the filter and inside the filter cover.
NRemove and check the filter 
element (3) – replace if dirty or 
damaged.
NFit the filter in the filter housing.NPosition filter cover against the left 
side of the filter housing and swing it 
to the right – the two lugs (arrows) 
must engage the filter cover 
openings. 
NInsert the screw...

HS 81 R, HS 81 RC, HS 81 T, HS 81 TC English
18
General information
The carburetor comes from the factory 
with a standard setting.
This setting provides an optimum fuel-air 
mixture under most operating 
conditions.
With this carburetor it is only possible to 
adjust the high speed screw within fine 
limits.
Standard setting
NStopping the engine
NCheck the air filter and clean or 
replace if necessary.
NCheck the spark arresting screen 
(country-specific) in the muffler and 
clean or replace if...