Saw Chain Tension Adjustment; Chain Brake Mechanical Test - Spark PROFESSIONAL TV 3840 Mode D'emploi

ment is required. Follow instructions in Section SAW
cHAIN tENSIoN ADJUStmENt.
A
Fig. 4A

SAW cHAIN tENSIoN ADJUStmENt

Your user manual is both a reference guide and
handbook provided to furnish you with general in-
formation to assemble, operate and maintain your
saw.
cAUtIoN: Always wear heavy duty
gloves when handling saw chain or making saw
chain adjustments..
to adjust saw chain:
1. Hold nose of guide bar up and turn adjustment
screw (3) 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. 5).
2. After making adjustment, and while still holding
nose of bar in the uppermost position, tighten the
bar retaining nuts securely. Chain has proper ten-
sion 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 re-
quires minor adjustment as follows:
A. Loosen the 2 bar retaining nuts so they are fin-
ger 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 the uppermost position and tighten the
2 bar retaining nuts securely.
cAUtIoN: A new saw chain stretches,
requiring adjustment after as few as 5 cuts. This is
normal with a new chain, and the interval between
future adjustments will lengthen quickly.
Original instructions
D
B
C
Fig. 4B

cHAIN bRAkE mEcHANIcAL tESt

Your chain saw is equipped with a chain brake that
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, op-
erator's hand strikes the lever. When the brake is
actuated, chain movement stops abruptly.
to test chain brake:
1. The chain brake is disengaged (chain can
2. The chain brake is engaged (chain is stopped)
NotE. The brake lever should snap into both posi-
tions. If strong resistance is felt, or lever does not
Fig. 5
cAUtIoN: If saw chain is too loose or
too tight, the sprocket, bar, chain, and crankshaft
bearings will wear more rapidly. Study Fig. 6 for
information concerning correct cold tension (A),
correct warm tension (B), and as a guide for when
saw chain needs adjustment (C).
Fig. 6
WARNING: The purpose of the chain
brake is to 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 before using your saw and periodically
while on the job.
move) when brake lever is pulled back and
locked (Fig. 7A).
when brake lever is in forward position. You
should not be able to move chain (Fig. 7B).
3
7
EN