Yard Machines MTD1425NAV Operator's Manual page 15

MAINTENANCE AND REPAIR INSTRUCTIONS
SAW CHAIN TENSION ADJUSTMENT
WARNING:
when handling the saw chain.
Proper tension of saw chain is extremely important and
must be checked before starting, as well as during any
cutting operation.
Taking the time to make needed adjustments to the saw
chain will result in improved cutting performance and
prolonged chain life.
To adjust the saw chain:
1. Loosen bar nut, hold nose of guide bar up and turn
adjustment screw (D) CLOCKWISE to increase chain
tension. Turning screw COUNTERCLOCKWISE will
decrease amount of tension on chain. Ensure the chain
fits snugly all the way around the guide bar (Fig. 22).
2. After making adjustment, and while still holding nose
of bar in the uppermost position, tighten the bar
retaining nut securely. Chain has proper tension
when it has a snug fit all around and can be pulled
around by gloved hand.
NOTE: If chain is difficult to rotate on guide bar or if it
binds, too much tension has been applied. This
requires minor adjustment as follows:
A. Loosen the bar retaining nut so it is finger tight.
Decrease tension by turning the bar adjustment
screw COUNTERCLOCKWISE slowly. Move chain
back and forth on bar. Continue to adjust until chain
rotates freely, but fits snugly. Increase tension by
turning bar adjustment screw CLOCKWISE.
B. When saw chain has proper tension, hold nose of bar
in uppermost position and tighten the bar retaining
nut securely.
A
Always use
protective gloves
D
Fig. 22
B
C
Fig. 23
CAUTION:
adjustment after as few as 5 cuts. This is normal
with a new chain, and the interval between
future adjustments will lengthen quickly.
CAUTION:
TIGHT, the sprocket, bar, chain, and
crankshaft bearings will wear more rapidly.
Study Fig. 23 for information concerning
correct cold tension (A), correct warm
tension (B), and as a guide for when saw
chain needs adjusdjtment (C).
CHAIN BRAKE MECHANICAL TEST
WARNING:
reduce the possibility of injury due to
kickback; however, it cannot provide the
intended measure of protection if the saw is
operated carelessly.
Always test the Chain Brake
your saw and periodically while on the job.
Your chain saw is equipped with a Chain Brake
reduces possibility of injury due to kickback. The brake
is activated if pressure is applied against brake lever
when, as in the event of kickback, operator's hand
strikes the lever. When the brake is actuated, chain
movement stops abruptly.
To Test the Chain Brake
1. The Chain Brake
when BRAKE LEVER IS PULLED BACK AND
LOCKED (A, Fig. 24).
2. The Chain Brake
when brake lever is in forward position. You should
not be able to move chain (B, Fig. 24).
NOTE: The brake lever should snap into both positions.
If strong resistance is felt, or lever does not move
into either position, do not use your saw. Take it
immediately to a Authorized Service Center for
repair. Call 1-800-520-5520 for more information.
15
A new saw chain
stretches, requiring
saw chain is TOO
LOOSE or TOO
The purpose of the
Chain Brake
before using
®
®
:
®
is DISENGAGED (chain can move)
® is ENGAGED (chain is stopped)
A
Fig. 24
® is to
® that
B