Homelite UT43160 User Manual - Page 16

MAINTENANCE NOTE: New chain tends to stretch; check chain tension frequently and tension as required. CAUTION: Chain tensioned while warm, may be too tight upon cooling. Check the "cold tension" before next use. REPLACING THE BAR AND CHAIN See Figures 13 - 16. DRIVECASE COVER CHAIN BAR BAR NUT Fig. 13 SPROCKET CHAIN TENSIONING PIN WARNING: To avoid possible serious injury, stop the motor and disconnect from power supply before replacing the bar, chain, or performing any maintenance operation. DRIVECASE COVER n Remove the bar nut (7/16 in.) and drivecase cover. n The bar contains a bar stud slot that fits over the bar stud. The bar also contains a chain tensioning pin hole which fits over the chain tensioning pin. n Place the bar onto the bar stud so that the chain tensioning pin fits into the chain tensioning pin hole. BAR STUD BAR CHAIN BAR NUT TENSIONING PIN HOLE BAR STUD SLOT n Fit the chain over the sprocket and into the bar groove. The cutters on the top of the bar should face toward the bar tip, in the direction of the chain rotation. n Replace the drivecase cover and install the bar nut. Tighten the bar nut finger tight only. The bar must be free to move for tension adjustment. SPROCKET Fig. 14 CHAIN ROTATION CHAIN n Remove all slack from chain by turning the chain tensioning screw clockwise, assuring that the chain seats into the bar groove during tensioning. n Lift the tip of the bar up to check for sag. Release the tip of the bar, and turn the chain tensioning screw 1/2 turn clockwise. Repeat this process until sag does not exist. n Hold the tip of the bar up and tighten the bar nut securely. n Chain is correctly tensioned when there is no slack on the underside of the bar, the chain is snug, but it can be turned by hand without binding. CHAIN TENSIONING SCREW Fig. 15 NOTE: If chain is too tight, it will not rotate. Loosen the bar nut slightly and turn adjusting screw 1/4 turn counterclockwise. Lift the tip of the bar up and retighten bar nut. Page 16 - English