Stihl MS 390 User Manual

20 MS 290, MS 310, MS 390
: Carefully pry the hand guard (1)
and bell crank (2) off their pivot
pins and remove them together.
– Pull the bell crank out of the hand
guard.
135RA032
1
2
VA
: Detach the spring (2).
: Remove the E-clip (1).
: Pull off the cam lever (3).
– Inspect parts and replace if
damaged.
VA
146RA202
4
3
1
2
– Clean the entire housing recess
for the chain brake.
: If the groove in the pin (4) (for
spring) is worn, install a new pin,
b 5.7.1
– If necessary, pull the bell crank
out of the hand guard.
Install in the reverse sequence.
– Lubricate all sliding and bearing
points with STIHL multipurpose
grease or, preferably,
molybdenum grease (e.g.
Molykote), b 13.
: Push the bell crank into the side
of the hand guard. The short arm
of the bell crank must point to the
top of the hand guard.
VA
209RA018
: Use assembly tool (2)
1117 890 0900 to attach the
brake spring (1) to the anchor pin.
VA
209RA019
1
2
: Fit the bushing (1) in the hand
guard (2).
: Insert M5x24 screw (3) and
tighten it down firmly, b 3.5
Install all other parts in the reverse
sequence.
VA
208RA004
3
1
2
– Check operation of chain brake,
b 5.6.1

Stihl MS 390 Specifications

General

Engine Displacement	64.1 cc
Chain Pitch	3/8"
Weight	6.2 kg
Guide Bar Lengths	40 to 50 cm
Fuel Capacity	0.68 l (23.0 oz)