Makita BUC121 Instruction Manual

Also see for BUC121: Technical information Instruction manual Instruction manual Instruction manual Instruction manual

Contents

12Pruning treesFig.12Fig.13CAUTION:• Keep all parts of the body away from the saw chainwhen the motor is operating.• Hold the chain saw firmly with both hands whenthe motor is running.• Do not overreach. Keep proper footing andbalance at all times.Bring the tip guide/lower guide into contact with thebranch to be cut before switching on. Cutting withoutbringing the tip guide/lower guide into contact with thebranch may cause the guide bar to wobble, resulting ininjury to operator.When cutting thick branches, first make a shallowundercut and then make the finish cut from the top.Fig.14If you try to cut off thick branches from the bottom, thebranch may close in and pinch the saw chain in the cut.If you try to cut off thick branches from the top without ashallow undercut, the branch may splinter.Fig.15If you cannot cut the timber right through with a singlestroke:Apply light pressure to the handle and continue sawingand draw the chain saw back a little; then apply thespike a little lower and finish the cut by raising thehandle.Fig.16Carrying toolFig.17Always remove the battery cartridge from the tool andoverlap the guide bar with the scabbard before carryingthe tool. Also cover the battery cartridge with the batterycover.MAINTENANCECAUTION:• Always be sure that the tool is switched off and thebattery cartridge is removed before attempting toperform inspection or maintenance.• Always wear gloves when performing anyinspection or maintenance.Sharpening the saw chainCAUTION:• Always remove the battery cartridge and wearsafety gloves when performing work on the sawchain.Fig.18Sharpen the saw chain when:− Mealy sawdust is produced when damp wood iscut;− The chain penetrates the wood with difficulty, evenwhen heavy pressure is applied;− The cutting edge is obviously damaged;− The saw pulls to the left or right in the wood. Thereason for this behaviour is uneven sharpening ofthe saw chain, or damage to one side only.Sharpen the saw chain frequently, but remove only alittle material each time.Two or three strokes with a file are usually sufficient forroutine resharpening. When the saw chain has beenresharpened several times, have it sharpened in aMAKITA specialist repair shop.File and file guiding− Use a special round file (optional accessory) forsaw chains, with a diameter of 4 mm, to sharpenthe chain. Normal round files are not suitable.Fig.19− The file should only engage the material on theforward stroke. Lift the file off the material on thereturn stroke.− Sharpen the shortest cutter first. The length of thiscutter is then the gauge dimension for all othercutters on the saw chain.− Guide the file as shown in the figure.− The file can be guided more easily if a file holder(accessory) is employed. The file holder hasmarkings for the correct sharpening angle of 30 °(align the markings parallel to the saw chain) andlimits the depth of penetration (to 4/5 of the filediameter).Guide the file as shown in the figure.− After sharpening the chain, check the height of thedepth gauge using the chain gauge tool (optionalaccessory).Fig.20− Remove any projecting material, however small,with a special flat file (optional accessory).− Round off the front of the depth gauge again.− Wash away dust and particles from saw chain afteradjusting the height of depth gauge.Cleaning guide barFig.21Chips and sawdust will build up in the guide bar groove,clogging it and impairing oil flow. Always clean out thechips and sawdust when sharpening or replacing thesaw chain.Cleaning the oil filter at the oil discharge holeSmall dust or particles may be built up in the oil filter atthe oil discharge hole during operation.Small dust or particles built up in the oil filter may impairthe oil discharge flow and cause an insufficientlubrication on the whole saw chain.