Stihl MS 391 Instruction Manual

MS 311, MS 391
English
50
Maintenance and Care
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
Complete machine
Visual inspection (condition, leaks) XX
Clean X
Throttle trigger, throttle trigger lockout, choke
lever, choke control, stop switch, master control
lever (dependent on equipment)
Function tests XX
Chain brake
Function tests XX
Have checked by a specialist dealer
1)
X
Manual fuel pump (if present)
Check X
Have repaired by a specialist dealer
1)
X
Fuel pick-up body / filter in fuel tank
Check X
Clean, replace filter insert XX
Replace XXX
Fuel tank Clean X
Lubricating oil tank Clean X
Chain lubrication Check X
Saw chain
Check, pay attention to sharpness XX
Check chain tension XX
Sharpen X
Guide bar
Check (wear, damage) X
Clean and turn over X
Deburr X
Replace XX
Chain sprocket Check X
Air filter
Clean XX
Replace X

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