Stihl Ms 250 C Manual

MS 250
English
19
Bucking
Bucking is cutting a log into sections.
WARNING
When bucking, do not stand on the log. 
Make sure the log will not roll downhill. If 
on a slope, stand on the uphill side of the 
log. Watch out for rolling logs.
Cut only one log at a time.
Shattered wood should be cut very 
carefully. Sharp slivers of wood may be 
caught and flung in the direction of the 
operator of the saw.When cutting small logs, place log 
through "V"-shaped supports on top of a 
sawhorse. Never...

MS 250
English
20
WARNING
There are a number of factors that may 
affect and change the intended direction 
of fall, e.g. wind direction and speed, 
lean of tree, surrounding trees and 
obstacles, sloping ground, one-sided 
limb structure, wood structure, decay, 
snow load, etc. To reduce the risk of 
severe or fatal injury to yourself or 
others, look for these conditions prior to 
beginning the cut, and be alert for a 
change in direction while the tree is 
falling.
WARNING
Always observe the general...

MS 250
English
21 Buttress Roots
If the tree has large buttress roots, cut 
into the largest buttress vertically first 
(horizontally next) and remove the 
resulting piece.
Gunning Sight
When making the felling notch, use the 
gunning sight on the shroud and housing 
to check the desired direction of fall:
Position the saw so that the gunning 
sight points exactly in the direction you 
want the tree to fall.Conventional Cut
Felling notch (C) – determines the 
direction of the fall
For a conventional...

MS 250
English
22 Making Sapwood Cuts
NFor medium sized or larger trees 
make cuts at both sides of the trunk, 
at same height as subsequent 
felling cut.
NCut to no more than width of guide 
bar.
This is especially important in softwood 
in summer – it helps prevent sapwood 
splintering when the tree falls.D =Felling Cut 
Conventional and open-face technique:
NBegin 1 to 2 inches (2,5 to 5 cm) 
higher than center of felling notch.
NCut horizontally towards the felling 
notch.
NLeave approx.1/10 of...

MS 250
English
23 Felling Cut for Small Diameter Trees: 
Simple Fan Cut
Engage the bumper spikes of the chain 
saw directly behind the location of the 
intended hinge and pivot the saw around 
this point only as far as the hinge. The 
bumper spike rolls against the trunk.Felling Cut for Large Diameter Trees
WARNING
Felling a tree that has a diameter greater 
than the length of the guide bar requires 
use of either the sectioning felling cut or 
plunge-cut method. These methods are 
extremely dangerous...

MS 250
English
24 The plunge cut is made with the guide 
bar nose. Begin the plunge cut by 
applying the lower portion of the guide 
bar nose to the tree at an angle. Cut until 
the depth of the kerf is about the same 
as the width of the guide bar. Next, align 
the saw in the direction in which the 
recess is to be cut.
With the saw at full throttle, insert the 
guide bar in the trunk.
Enlarge the plunge cut as shown in the 
illustration.
WARNING
There is an extreme danger of kickback 
at this point....

MS 250
English
25 nut, it must be securely attached.) A 
loose connection between spark plug 
terminal and the ignition wire connector 
in the boot may create arcing that could 
ignite combustible fumes and cause a 
fire.
WARNING
Never test the ignition system with the 
spark plug boot removed from the spark 
plug or with a removed spark plug, since 
uncontained sparking may cause a fire.
WARNING
Do not operate your power tool if the 
muffler is damaged, missing or modified. 
An improperly maintained...

MS 250
English
26 A cutting attachment consists of the saw 
chain, guide bar and chain sprocket.
The cutting attachment that comes 
standard is designed to exactly match 
the chain saw.
–The pitch (t) of the saw chain (1), 
chain sprocket and the nose 
sprocket of the Rollomatic guide bar 
must match.
–The drive link gauge (2) of the saw 
chain (1) must match the groove 
width of the guide bar (3).
If non-matching components are used, 
the cutting attachment may be damaged 
beyond repair after a short...

MS 250
English
27
Disengaging the chain brake.
NPull the hand guarad towards the 
front handle until there is an audible 
click – the chain brake is 
disengaged.
Fitting the chain
WARNING
Wear work gloves to protect your hands 
from the sharp cutters.
NFit the chain – start at the bar nose.NFit the guide bar over the studs (1) – 
the cutting edges on the top of the 
bar must point to the right.
NEngage the peg of the tensioner 
slide in the locating hole (2) –- place 
the chain over sprocket (3) at the...

MS 250
English
28 NShut off the engine.
NWear work gloves to protect your 
hands.
NThe chain must fit snugly against 
the underside of the bar and it must 
still be possible to pull the chain 
along the bar by hand.
NIf necessary, retension the chain.
A new chain has to be retensioned more 
often than one that has been in use for 
some time.
NCheck chain tension frequently – 
see chapter on "Operating 
Instructions".This engine is certified to operate on 
unleaded gasoline and the STIHL two-...