Craftsman 138.98946 Operator's Manual page 21

RECOMMENDED BAR AND CHAIN
COMBINATIONS
Bar Part Number - 12in.
120SDEA041
Chain Part Number
91 P045X/91 PX045X
[] Replace the chain cover, washer and chain
cover screw. Tighten the chain cover screw
finger tight only. The bar must be free to
move for tension adjustment.
[] Remove all the slack from the chain by turn-
ing the chain tensioning screw clockwise until
the chain seats snugly against the bar with
the drive links in the bar groove.
[] Lift the tip of the guide bar up to check for
sag. Release the tip of the guide bar and turn
the chain tensioning screw 1/2 turn clock-
wise. Repeat this process until sag does not
exist.
[] Hold the tip of the guide bar up and tighten
the bar mounting screw securely.
[] Chain is correctly tensioned when there is no
sag on the underside of the guide bar, the
chain is snug, but it can be turned by hand
without binding.
CHAIN TENSION
See figure 29-30.
[] Stop the motor before setting the chain ten=
sion. Make sure the guide bar screw is loos-
ened to finger tight, turn the chain tensioner
clockwise to tension the chain. Refer to Re-
placing Bar and Chain earlier in this manual
for additional information.
[] A cold chain is correctly tensioned when there
is no slack on the underside of the guide bar,
the chain is snug, but it can be turned by
hand without binding.
[] Chain must be re-tensioned whenever the
flats on the drive links hang out of the bar
groove.
[] During normal saw operation, the temperature
of the chain will increase. The drive links of a
correctly tensioned warm chain will hang ap=
proximately .050 in. out of the bar groove.
NOTE: New chain tends to stretch, check chain
tension frequently and tension as required.
21 - English