Oil Quantity Control; Taking Care Of The Guide Bar - Stihl MS 290 Instruction Manual

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.
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Use the adjusting screw (1) (on
underside of machine) to vary the oil
feed rate as required.
Ematic position (E), medium oil flow rate
–
turn the adjusting screw to "E"
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(Ematic position).
To increase oil feed –
turn the adjusting screw clockwise.
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Turn reduce oil feed –
turn the adjusting screw
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counterclockwise.
The chain must always be wetted with a
film of lubricant.
MS 290, MS 310, MS 390

Taking Care of the Guide Bar

2
1
Turn the bar over – every time you
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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.
Regularly clean the oil inlet hole (1),
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the oilway (2) and the bar
groove (3).
Measure the groove depth – with the
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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
If groove depth is less than specified:
Replace the guide bar.
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The drive link tangs will otherwise
scrape along the bottom of the groove –
the cutters and tie straps will not ride on
the bar rails.
3
English
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