Stihl MS 390 User Manual

63MS 290, MS 310, MS 390
: Swing the oil pump (1) forwards a
little.
: Carefully remove oil pump (1),
pulling the elbow connector (2)
off the engine housing nipple at
the same time.
VA
209RA033
1
2
– Remove the muffler, b 6.1
: Fit new O-ring (arrow) on engine
housing nipple.
Install in the reverse sequence.
VA
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: Hold the elbow connector at a
slight angle and fit the oil pump.
VA
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: Push the elbow connector onto
the engine housing nipple
(arrow).
The elbow connector must snap
audibly into position.
– Line up the oil pump.
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Install all other parts in the reverse
sequence.
When fitting the cover washer,
make sure the word “TOP” faces
outwards.
Check the suction hose and pickup
body are clean before dis-
assembling the oil pump, b 10.1.
– Remove the oil pump, b 10.4.1
: Turn the elbow connector (6)
forwards through 90 degrees and
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1
6
5
4
7
8
9
2 3 2
pull it out of the oil pump (4).
: Take the O-ring (5) off the elbow
connector.
: Use a 2 mm drift to drive out the
spring pin (7).
: Pull the control bolt (9) out of the
housing and remove the O-rings
(8).
: Remove the pump piston (1) with
spring (3) and washers (2).
– Clean all parts with standard
solvent-based degreasant
containing no chlorinated or
halogenated hydrocarbons,
b 13.
Install in the reverse sequence.
10.4.2 Servicing

Stihl MS 390 Specifications

General

Brand	Stihl
Model	MS 390
Category	Chainsaw
Language	English