Stihl MS 391

66 MS 311, MS 391
11.3 Oil Pump
– Troubleshooting, b 3.3
– Remove the brake band, b 5.2
– Remove the clutch, b 4
: Remove the washer (1).
: Pull the worm (1) with drive
spring (2) out of the oil pump.
: The spring (1) and worm (2) form
a single unit and must be
replaced if damaged.
4903RA178 TG
1
4903RA179 TG
1
2
219RA470 TG
1
2
: Pull off the oil suction hose (1).
: Take out the screws (1).
: Pull the oil pump (1) off the
nipple (2) and then lift it off over
the crankshaft stub.
4903RA180 TG
1
4903RA181 TG
1
1
4903RA177 TG
1
2
Installing
: Fit the oil pump (1) over the
crankshaft stub (2).
: Push the connector (1) onto the
nipple (arrow).
4903RA182 TG
1
2
4903RA183 TG
1