Stihl Hs 81 R Manual

HS 81 R, HS 81 RC, HS 81 T, HS 81 TCEnglish
19 In some countries the muffler is 
equipped with a spark arresting screen.
NCheck the spark arresting screen in 
the muffler after every 20 hours of 
operation, or if the engine is down 
on power or runs erratically at 
maximum speed.
NTake out the screws (1).
NRemove the exhaust pipe (2).NUse a 15 mm socket wrench to 
unscrew the spark arresting screen.
NClean the spark arresting screen. If 
the screen is damaged or heavily 
carbonized, fit a new one.
NRefit...

HS 81 R, HS 81 RC, HS 81 T, HS 81 TC English
20 Rectify problems which have caused 
fouling of spark plug:
NToo much oil in fuel mix.
NDirty air filter.
NUnfavorable running conditions, 
e.g. operating at part load.
Fit a new spark plug after approx. 100 
operating hours or earlier if the 
electrodes are badly eroded.Use STIHL gear lubricant for hedge 
trimmers (special accessory) to lubricate 
the blade drive gear.
After about 25 hours of operation:
NRemove the screw plug (1) from the 
gear housing on...

HS 81 R, HS 81 RC, HS 81 T, HS 81 TCEnglish
21 NRemove the tube of grease (2).
NRefit the filler plug and tighten it 
down firmly.
To help prolong the wear life of the 
starter rope, observe the following 
points:
NPull the starter rope only in the 
direction specified.
NDo not pull the rope over the edge of 
the guide bushing.
NDo not pull out the rope more than 
specified.
NDo not allow the starter grip to snap 
back, guide it back into the housing 
slowly – see chapter on Starting / 
Stopping the...

HS 81 R, HS 81 RC, HS 81 T, HS 81 TC English
22 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...

HS 81 R, HS 81 RC, HS 81 T, HS 81 TCEnglish
23
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
if required
Complete machineVisual inspection (condition, leaks)XX
CleanX
Control handle...

HS 81 R, HS 81 RC, HS 81 T, HS 81 TC English
24
Cutting bladesCleanX
SharpenX
Visual inspectionX
Have replaced by dealer
1)X
Adjust blade clearance
3)X
Gearbox lubricationCheck and replenish after every 25 
hours of operation
Safety labels ReplaceX
1)STIHL recommends a STIHL servicing dealer.2)not in all versions, market-specific3)not in all versions, market-specific or available as special accessory The following intervals apply to normal operating conditions only. If your daily work-
ing time is longer...

HS 81 R, HS 81 RC, HS 81 T, HS 81 TCEnglish
25
Main Parts
5
13
8
9
3
10
7
20
17
2
442BA016 KN
1
4
6
#
11
1214
16
15
1819 

HS 81 R, HS 81 RC, HS 81 T, HS 81 TC English
26 1Starter Grip
2Rear Handle
3Throttle Trigger Lockout
4Throttle Trigger
5Blocking Lever
6Filter Box Cover
7Fuel Pump
8Spark Plug Boot
9Front Handle
10Carburetor Adjusting Screws
11Starting Throttle Lock
12Stop Switch
13Fuel Filler Cap
14Fuel Tank
15Muffler
16Fan Housing
17Choke Lever
18Blade Scabbard
19Cutting Blade Guard
20Cutting Blades
#Serial Number
Definitions
1. Starter Grip
The grip of the pull starter, for 
starting the engine.
2. Rear Handle
The...

HS 81 R, HS 81 RC, HS 81 T, HS 81 TCEnglish
27
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
Ignition System
Electronic magneto ignition 
(breakerless)
Fuel System
All position diaphragm carburetor...

HS 81 R, HS 81 RC, HS 81 T, HS 81 TC English
28 Contact your STIHL dealer for 
information regarding special 
accessories that may be available for 
your product.Users of this unit should carry out only 
the maintenance operations described 
in this manual. Other repair work may be 
performed only by authorized STIHL 
service shops.
Warranty claims following repairs can be 
accepted only if the repair has been 
performed by an authorized STIHL 
servicing dealer using original STIHL 
replacement parts....