Taking Care Of The Guide Bar; Shroud - Stihl MS 251 Manual De Instrucciones

Taking Care of the Guide Bar

2
1
Turn the guide bar over – every time
N
you sharpen the chain and every
time you replace the chain – this
helps avoid one-sided wear,
especially at the nose and
underside of the bar.
Regularly clean the oil inlet hole (1),
N
the oilway (2) and the bar groove
(3).
Measure the groove depth – with the
N
scale on the filing gauge (special
accessory) – in the area used most
for cutting.
MS 251, MS 251 C
Chain Chain pitch
type
Picco 1/4" P
Rapid 1/4"
Picco 3/8" P
Rapid 3/8"; 0.325"
Rapid 0.404"
If groove depth is less than specified:
Replace the guide bar.
N
The drive link tangs will otherwise
scrape along the bottom of the groove –
the cutters and tie straps will not ride on
the bar rails.
3
Minimum

Shroud

groove depth
0.16" (4.0 mm)
0.16" (4.0 mm)
Remove shroud
0.20" (5.0 mm)
0.24" (6.0 mm)
Move the Master Control Lever to
N
0.28" (7.0 mm)
the stop position 0
Push the front hand guard forwards
N
– the saw chain is blocked
Loosen screws (1)
N
Remove the shroud (2)
N
Refitting the shroud
Refit the shroud and tighten the
N
screws
English
1
2
1
1
41