Issue link: http://alpine.uberflip.com/i/577795
35 AutoMill HP ™ P R O D U C T M A N U A L EN 5.3. Adjusting the Hold-down Chains A properly tensioned chain will have approximately 1" of sag in the middle of the chain. 1. Lock and tag out the electrical and air supply in accordance with OSHA procedures (i.e. OSHA 29 CFR 1910.147). 2. Loosen the three Hold-down infeed plate bolts (Figure 57). Infeed Plate Bolts Jam Nut Tension Bolt Figure 57 3. Loosen the tension jam nuts - one on each side of the Hold-down. 4. Tighten the tension bolts until the chain has the proper tension. NOTE Both tension bolts should be turned an equal amount to keep the infeed sprocket centered in the Hold-down. 5. Tighten the jam nuts. 6. Tighten the Hold-down infeed plate bolts. 5.4. Leveling the Hold-downs When level, the Hold-downs exert even pressure on the boards as they are fed through the saw. All of the springs should compress an equal amount as a board passes through the saw. ! CAUTION If the Hold-downs are not level across the width of the machine (front-to-back), the lumber could shift as it is being cut. 1. Place 2x4's on the Material Conveyors – one on each dog. 2. Lower the Hold-downs until they are just touching the boards. ! CAUTION DO NOT COMPRESS THE SPRINGS! ! WARNING If there is a clicking or rattling noise, DO NOT OPERATE THE SAW UNTIL CORRECTIONS HAVE BEEN MADE. This is an indication that the countersunk holes in the blade are too big, allowing the flat head bolts to bottom out on the mandrel before they tighten down on the blade. This condition will cause the heads of the bolts to fail and allow the blade to come off the mandrel. Call Alpine Equipment Customer Service for instructions on how to correct this situation. ! WARNING DO NOT REMOVE THE SAFETY ROLL PIN IN THE MANDREL! If the safety roll pin in the mandrel needs to be removed or is damaged, replace it with a NEW pin (APN 6014 for Head 1-4; 6027 for Head 5). This pin is a fail safe to retain the blade in case of set screw failure and MUST be in place. NEVER operate the saw if this pin is not in place. Very serious injury or death could occur if a running saw blade were to come off the motor shaft. 5.2. Adjusting the Material Conveyor Chains A properly tensioned chain will move approximately 1" when pulled straight up at approximately 24" from the infeed side of the conveyor. 1. Lock and tag out the electrical and air supply in accordance with OSHA procedures (i.e. OSHA 29 CFR 1910.147). 2. Remove the chain tension access cover (Figure 56). - Jam Nut Tension Nut Access Cover Figure 56 3. Loosen the jam nut closest to the saw frame. 4. Tighten the tension nut until the chain has the proper tension. 5. Tighten the jam nut. 6. Replace the cover.