Stihl MS 391 Instruction Manual

MS 311, MS 391
English
51
Anti-vibration elements
Check XX
Have them replaced by a servicing dealer
1)
X
Air intake on fan housing Clean XX X
Cylinder fins Clean XX
Carburetor
Check idle adjustment – saw chain must not
rotate
XX
Set the idle speed, have the chain saw repaired
by a servicing dealer
1)
X
Spark plug
Adjust electrode gap X
Replace after 100 hours of operation
All accessible screws, nuts and bolts (not adjusting
screws)
Tighten
2)
X
Spark arresting screen in muffler
Have checked by a specialist dealer
1)
X
Have cleaned by a specialist dealer, or replaced
if necessary
1)
X
Chain catcher
Check X
Replace X
Exhaust bore
Decarbonise after 139 hours of operation, subse-
quently after every 150 hours of operation
X
Safety information label Replace X
1)
STIHL recommends STIHL servicing dealers
2)
During initial use of professional chain saws (with a power output of 3.4 kW or more), tighten the cylinder block screws after 10 to 20 hours of operation
The following information applies under normal operating conditions. The specified intervals must be
shortened accordingly when working for longer than normal each day or under difficult conditions
(extensive dust, highly resinous lumber, lumber from tropical trees, etc.). If the machine is only used
occasionally, the intervals can be extended accordingly.
Before starting work At the end of work and/or daily Whenever tank is refilled Weekly Monthly Yearly If faulty If damaged As required

Stihl MS 391 Specifications

General

Motor type	2-stroke motor
Chain gauge	1.6 mm
Chain pitch	3/8 \
Automatic oiling	Yes
Oil tank capacity	0.35 L
Fuel tank capacity	0.6 L
Engine displacement	64.1 cm³
Engine power	4.4 hp
Power source	Gasoline

Weight and Dimensions

Weight	6200 g