Saw Chain Tension Adjustment - McCulloch TimberBear TM502 Manual Del Usuario

7. Slip the chain around the sprocket (J) behind the clutch
(K). Make sure the links fit between the sprocket teeth
(Figure 3-3G).
8. Guide the drive links into the groove (L) and around the
end of the bar (Figure 3-3G).
9. The chain will be tight so you will have to rotate the
clutch clockwise by hand so the chain engages the bar
sprocket (Figure 3-3H).
10. Inspect to insure that tang (E) is in the adjustment hole
on the bar (Figure 3-3J).
11. Replace the outer guide bar plate (M) so the bent
edges (top and bottom) are directed away from the
chain (Figure 3-3K)
12. Install the CHAIN BRAKE
sure the chain does not slip off of the bar. Install the 2
nuts hand tight and follow tension adjustment instruc-
tions in Section 3-4.
NOTE: The guide bar retaining nuts are installed only hand
tight at this point because saw chain adjustment is
required.
3 - REMOVING & INSTALLING BAR & CHAIN
® cover (Figure 3-3K). Make
L
J
K
3-3G
3-3H
E
3-3J

3-4. SAW CHAIN TENSION ADJUSTMENT

Proper tension of saw chain is extremely important and
must be checked before starting, as well as during any cut-
ting operation.
Taking the time to make needed adjustments to the saw
chain will result in improved cutting performance and pro-
longed chain life.
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.
WARNING
Always wear heavy duty gloves when handling saw chain
or making saw chain adjustments.
CAUTION
If saw chain is TOO LOOSE or TOO TIGHT, the sprocket,
bar, chain, and crankshaft bearings will wear more rapidly.
Study Figure 3-4A for information concerning correct cold
tension (A), correct warm tension (B), and as a guide for
when saw chain needs adjustment (C).
A
8
M
3-3K
B
C
3-4A