Stihl FS 91 R User Manual

FS 91, FS 91 R
English
44
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 machine
Visual inspection (condition, leaks) X X
Clean X
Replace any damaged parts XX
Control handle Check operation XX
Air filter
Visual inspection X X
Replace
2)
X
Manual fuel pump (if fitted)
Check X
Have repaired by servicing dealer
1)
X
Pickup body in fuel tank
Have checked by servicing dealer
1)
X
Have replaced by servicing dealer
1)
XXX
Fuel tank Clean XX
Carburetor
Check idle adjustment – the cutting
attachment must not rotate
XX
Adjust idle speed X
Spark plug
Adjust electrode gap X
Replace after every 100 operating hours
Cooling inlets
Visual inspection X
Clean X
Cylinder fins Have cleaned by servicing dealer
1)
X
Valve clearance
If power is low or cranking effort very
high, have valve clearance checked
and, if necessary, adjusted by servicing
dealer
1)
X
Spark arresting screen in muffler
Check XX
Clean or replace XX

Stihl FS 91 R Specifications

General

Type	String trimmer
Cordless	Yes
Head type	Nylon line
Handle type	D-loop handle
Engine power	1.3 hp
Product color	Black, Metallic, Orange
Uncertainty K	2 m/s²
Rotational speed	8000 RPM
Number of strokes	4
Sound power level	107 dB
Fuel tank capacity	0.71 L
Vibration emission	3.7 m/s²
Engine displacement	28.4 cm³
Sound pressure level	96 dB
Cutting diameter (max)	- mm
Power source	Gasoline

Weight and Dimensions

Length	1800 mm
Weight	5500 g