Makita XCU07Z XCU07 Instruction Manual - Page 16

30 55 30 55 1 30 1/5 - The sharpening angle of 30° must be the same on all cutters. Different cutter angles cause the chain to run roughly and unevenly, accelerate wear, and lead to chain breaks. - Use a suitable round file so that the proper sharpening angle is kept against the teeth. • Chain blade 90PX : 55° • Chain blade 91PX : 55° • Chain blade 25AP : 55° File and file guiding - Use a special round file (optional accessory) for saw chains to sharpen the chain. Normal round files are not suitable. - Diameter of the round file for each saw chain is as follows: • Chain blade 90PX : 4.5 mm (3/16″) • Chain blade 91PX : 4.0 mm (5/32″) • Chain blade 25AP : 4.0 mm (5/32″) - The file should only engage the cutter on the forward stroke. Lift the file off the cutter on the return stroke. - Sharpen the shortest cutter first. Then the length of this shortest cutter becomes the standard for all other cutters on the saw chain. - Guide the file as shown in the figure. ► 1 . File holder - After sharpening the chain, check the height of the depth gauge using the chain gauge tool (optional accessory). - Remove any projecting material, however small, with a special flat file (optional accessory). - Round off the front of the depth gauge again. Cleaning the guide bar Chips and sawdust will build up in the guide bar groove. They may clog the bar groove and impair the oil flow. Clean out the chips and sawdust every time when you sharpen or replace the saw chain. 1 2 ► 1 . File 2. Saw chain - The file can be guided more easily if a file holder (optional accessory) is employed. The file holder has markings for the correct sharpening angle of 30° (align the markings parallel to the saw chain) and limits the depth of penetration (to 4/5 of the file diameter). 16 ENGLISH