Oil Quantity Control; Taking Care Of The Guide Bar - Stihl MS 391 Safety Manual

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Short-term storage
Wait for engine to cool down. Keep the
machine with a full tank of fuel in a dry
place, well away from sources of
ignition, until you need it again.
Long-term storage
See "Storing the machine"
26

Oil Quantity Control

Adjustable flow oil pump is a special
option.
Different quantities of oil are required for
different bar lengths, types of wood and
cutting techniques.
1
Use the adjusting screw (1) (on
underside of machine) to vary the oil
feed rate as required.
Ematic position (E), medium oil flow rate
–
N
turn the adjusting screw to "E"
(Ematic position).
To increase oil feed –
N
turn the adjusting screw clockwise.
Turn reduce oil feed –
N
turn the adjusting screw
counterclockwise.
The chain must always be wetted
with a film of lubricant.
Taking Care of the Guide
Bar
2
1
N
Turn the bar over – every time you
sharpen the chain and every time
you replace the chain – this helps
avoid one-sided wear, especially at
the nose and underside of the bar.
N
Regularly clean the oil inlet hole (1),
the oilway (2) and the bar
groove (3).
N
Measure the groove depth – with
the scale on the filing gauge (special
accessory) – in the area used most
for cutting.
Chain type Pitch Minimum
groove depth
Picco 3/8" P 5.0 mm
Rapid 1/4" 4.0 mm
Rapid 3/8"; 0.325" 6.0 mm
Rapid 0.404" 7.0 mm
MS 311, MS 391
3