14
English / USA
TS 400
2. Make certain water does not flow on 
a wheel that is not running, since the 
wheel will absorb water, which will 
affect wheel balance.
3. Shut water off before the wheel 
stops so that excess water will be 
dissipated.
4. Be certain water is applied to both 
sides of wheel, since uneven 
distribution can cause "one sided" 
wear.
Important Adjustments
At correct idle speed, the wheel should 
not turn. For directions to adjust idle 
speed, see the appropriate section of 
your instruction manual.
!Warning!
Do not use a cut-off machine with 
incorrect idle speed adjustment. The 
rotating wheel may cause injury. Have 
your STIHL dealer check your cut-off 
machine and make proper adjustments 
or repairs.
Never touch a rotating wheel with your 
hand or any part of your body.
Reactive Forces including Kickback
!Warning!
Reactive forces may occur at any time 
the cutting wheel on a cut-off machine is 
rotating. If the wheel is slowed or 
stopped by frictional contact with any 
solid object or by a pinch, reactive forces 
may occur instantly and with great force. 
These reactive forces may result in the 
operator losing control of the cut-off 
machine, which may, in turn, result in 
serious or fatal injury.
An understanding of the causes of these 
reactive forces may help you avoid loss 
of control. Reactive forces are exerted in 
a direction opposite to the direction in 
which the wheel is moving at the point of 
contact or pinch.
Pull-away, climbing, pinching and 
rotational kickback forces
The most common reactive forces are 
pull-away and climbing. If the contact is 
at the bottom of the wheel, a cut-off 
machine will try to pull away from the 
operator (pull-away). If the contact is at 
the front of the wheel, the wheel may 
attempt to climb the object being cut 
(climbing). Pinching occurs when the 
piece being cut closes on the wheel. If 
the wheel is severely pinched at the 
front, especially in the upper quadrant, 
the wheel may be instantly thrown up 
and back towards the operator with 
great force in a rotational kickback 
motion. 
The greater the force generated, the 
more difficult it will be for the operator to 
control the cut-off machine. Any of the 
reactive forces can, in some 
circumstances, cause the operator to 
lose control of a cut-off machine, 
allowing the rotating wheel to come into 
contact with the operator. Severe 
personal injury or death can result.