Repair - Stihl MS 441 Manual

1
: Take out screws (arrows).
– Remove and examine oil
pump (1), repair or replace if
necessary.
: Fit new O-ring (1) and check
connection (arrow) of oil suction
hose.
Always fit a new O-ring.
: Slide connector of oil pump (1)
into hole (arrow).
– Fit and tighten screws.
MS 441, MS 441 C
: Slide cover (1) into recess
(arrow) until it engages.
1
1
– Push worm into oil pump.
– Grease worm before installing it,
b 17.
: Slide washer (1) into place so
that the word "TOP" (arrow) is
visible.
– Reassemble all other parts in the
reverse sequence.
– Tightening torques, b 3.5.
1
– Check setting of oil pump, adjust
if necessary, b 13.3.2.

13.3.1 Repair

1
4
Check suction hose and pick-up
body before dismantling the oil
pump.
– Remove oil pump, b 13.3.
– Drive roll pin (1) out with a drift
dia. 2 mm.
– Pull out control bolt (2).
– Remove O-rings (3).
– Prise out plug (4).
– Pull out pump piston (5) with
compression spring (6) and
washers (7).
– Check whether parts can be
reused and clean them, b 17.
Always use new O-rings.
– Grease pump piston and worm
before installing them, b 17.
– Press plug (4) in against the
spring pressure when fitting the
control bolt (2).
– Reassemble in the reverse
sequence.
– Check setting of oil pump, adjust
if necessary, b 13.3.2.
5
1
7 3
7 6 2
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