39Checking, Oil ExchangeOperation Component Interval (hrs)10 100 250 500 1000 2500 5000Cleaning Hydraulic oil tank *Hydraulic oil filter *Checking Hydraulic oil in tank *Exchange Hydraulic oil in circuit *Exchange Oil gear *(5years)(*) clean daily under special conditions(**) clean every 4 – 5 hrs under extreme dusty conditions(***) see recommended oils(o) if clogging indicated() first exchangeFailures and TroubleshootingFailure Cause RemedyWrong chippingor loadingBlunt blades Remove and regrind blades. If worn,replace them for new ones.Worn opposite cuttingedgeRemove and regrind cutting edge; setoptimal clearance between blade andopposite cutting edgeMalfunction of loadingrollsSee Problems with hydraulicsWrong angle geometry Regrind in accordance with detailedfigure of edge geometryDamage/wear ofloading rollsReplacementToo small, dry or rottenmaterialsMix before loadingBreaker fouled Load longer materials with higherweightLoading rolls do notturn – rotor runs idleWrong setup of sensor for turning theloading rolls onserviceTractor engineoverloaded whilechippingWrong sensor settingfor min. speedSwitching-off speed is set too high serviceBlown fuse inregulation circuitFuse replacementFaulty control unit inregulation circuitReplacementFaulty sensor – LEDdoes not burnReplacementLoading rolls do notturnFaulty electricswitchboardCoil replacement