680ES OPERATOR MANUAL45© 2015 ICS®, Blount International Inc. Specifications are subject tochange without notice. REV071315 F/N 577451TroubleshootingTROUBLESHOOTINGPROBLEM Possible CauseSAW WON'T REACH FULL RPM Dirty air filter.SLOW CHAIN SPEEDChain tension too tight. Chain should always be able tobe pulled around the guidebar by hand. It is normal for thedrive links of the chain to hang below the guidebar.POOR CUTTING SPEED All of the above, plus diamonds may be glazed over. Makea few cuts in an abrasive material to expose the diamonds.PREMATURE CHAIN STRETCHNot enough water pressure. The minimum water pressurerequired is 1.5 bar (20 psi). Insufficient water supply mayresult in excessive wear to the chain, which can lead tostretch and chain breakage.CHAIN TENSIONER BREAKAGESide cover nuts are not tight enough. Torque to 27 Nm (20ft-lbs).Tensioning with side cover nuts already tight.WATER NOT FLOWINGWater hose is kinked or water supply not turned on.Water ports plugged with debris.WON'T STARTAged or bad fuel.Corroded or eroded spark plug.Multi-function lever in "STOP" position.DIFFICULT TO STARTFlooded engine. Put Multi-function lever in the middleposition hold throttle on full with foot and pull starter cord(hard, short, fast pulls) until engine starts.Fouled spark plug. Remove spark plug, clean, and re-gapto 0.5 mm (0.020 in).CHAIN BREAKAGEImproper chain tension.Insufficient water pressure.Inserting saw into slot narrower than diamond chainsegments.Using chain that is already stretched beyond ability totension