Stihl MS 461 - Adjusting Uprated Oil Pumps

74 MS 461, MS 461-R
: Pull the worm (1) with drive
spring (2) out of the oil pump.
– Check the spring and worm and
replace if necessary.
: Take out the screws (1).
: Pull off the oil pump (2), check
and replace if necessary.
: Install a new sealing ring (1).
Always use a new sealing ring.
1
3443RA148 TG
2
3443RA490 TG
1
2
1
1
3443RA421 TG
Installing
– Lubricate the pump piston with
STIHL multipurpose grease,
b 15
–
: Line up the oil pump (1) so that
the stub (2) engages the oil
suction hose (3) and face (4) with
hole locates against the sealing
ring (5).
– Coat stub and sealing ring with
STIHL press fluid, b 15
: Push oil pump (1) into position.
: Fit the screws (2)
and tighten them down firmly.
– Push the worm fully home.
3443RA422 TG
1
4
3
5
2
2
1
2
3443RA423 TG
: Push the washer (1) into position.
– The word "TOP" (arrow) must
face outwards.
– Reassemble all other parts in the
reverse sequence.
11.3.1 Adjusting Uprated Oil
Pumps
See owner's manual for most
suitable settings for different uses.
When oil pumps with an increased
oil flow rate are set within range "a",
note that the oil tank runs dry before
the fuel tank and the saw chain will
then have insufficient lubrication.
Therefore, if pump is set to range
"a", fill fuel tank to half full mark only
or refill oil tank when fuel tank is half
empty.
TOP
1
3443RA424 TG
a
3443RA425 TG