Stihl 038 - Oil Quantity Control

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Top: Holding bar nose and tightening one hexagon nut
Bottom: Checking chain tension
Proper chain tension and lubrication are critically impor-
tant in respect of cutting performance and the service life
of the whole cutting attachment. Always check chain lubri-
cation before starting work. Chain tension should be
checked frequently during cutting work and corrected as
necessary. For further details see Chapter “Bar, Chain and
Sprocket“.
Oil Quantity Control
® = Adjusting screw in minimum position
= Adjusting screw in “E” (Ematic) position te
© = Adjusting screw in maximal position
Different quantities of oil are required for different bar
lengths, types of wood and cutting techniques to ensure
adequate lubrication of the bar and chain. The feed rate of
the oil pump can be varied to suit requirements by means
of the adjusting screw on the underside of the machine.
The oil feed rate is increased by turning the adjusting
screw clockwise or decreased by turning it counter-
clockwise.
If you use a STIHL Ematic guide bar in normal operating
conditions you should leave the adjusting screw in the “E”
position. This is the oil pump’s most economic setting.
If you fit a shorter guide bar for felling small trees or limb-
ing, you can reduce the oil feed rate to a little less than the
“E” position. In case of longer guide bars, large stem dia-
meters and very dry wood it may be necessary to increase
the oil feed rate by turning the adjusting screw slightly
beyond the “E” position.
Insufficient lubrication can cause an abnormally high rate
of wear. For this reason you should make sure the chain is
always wetted with a film of lubricant.