Stihl MS 251 Manual

21MS 231, MS 231 C, MS 251, MS 251 C
Installing
– Disengage the chain brake
: Hold the brake band (1)
sideways, attach it to the brake
lever (2) and then swing it in the
direction of its seat.
: Position the brake band (1) in the
guide (arrow).
– Engage the chain brake.
: Push the brake band (1) over the
guide lugs (arrows) and into its
seat.
O
P
2
2310RA009 TG
1
T
OP
2310RA010 TG
1
TOP
2310RA011 TG
1
: Push the brake band (1) into
its seat (arrow) as far as stop.
: Fit the screw (2) on the underside
of the machine and tighten it
down firmly.
: Engage the cover (1) in
the slots (arrows) first.
: Place the cover (1) in position.
: Insert and tighten down the
screws (2) firmly.
1
2310RA012 TG
2
2310RA013 TG
1
TOP
2310RA014 TG
2
2
1
– Install the clutch drum,
b 4.1
The clutch drum must rotate freely
when the chain brake is
disengaged.
– Carry out the other checks,
b 5.1
– Reassemble all other parts in the
reverse sequence.
5.3 Brake Lever
– Troubleshooting, b 3.2
– Remove the shroud, b 6.4
– Remove the fan housing, b 8.2
– Remove the brake band, b 5.2
– Engage the chain brake.
The brake spring is now relaxed.
: Use the assembly tool
1117 890 0900 to disconnect the
brake spring (1) from the anchor
pin (arrow).
– Remove the brake spring from
the brake lever.
TOP
2310RA015 TG
1
All manuals and user guides at all-guides.com

Stihl MS 251 Specifications

General

Idle speed	2800 RPM
Motor type	2-stroke motor
Chain pitch	1/308 \
Blade length	450 mm
Product color	Black, Grey, Orange
Motor speed (max)	10000 RPM
Oil tank capacity	0.2 L
Fuel tank capacity	0.39 L
Engine displacement	45.6 cm³
Kickback protection	Yes
Engine power	3 hp
Power source	Gasoline
Sound power level	114 dB
Vibration emission	3.9 m/s²
Sound pressure level	103 dB

Weight and Dimensions

Weight	4900 g