Maintenance Instructions; Blade Sharpening; Blade Adjustment - Makita EH7500S Bedienungsanleitung

MAINTENANCE INSTRUCTIONS

- Turn off the engine and remove the spark plug connector when replacing or sharpening cutting tools, also when cleaning the cutter or cutting
device or carrying out any maintenance.
- Never straighten or weld a damaged cutting blade.
- Inspect the cutting blades with the engine switched off at short, regular intervals for damage.
- (Detection of hairline cracks by means of tapping-noise test.) Beware the teeth are sharp.
- Clean the Hedge Trimmer at regular intervals and check that all screws and nuts are well tightened.
- Never service or store the Hedge Trimmer in the vicinity of naked flames to avoid fires.
- Always wear leather gloves when handling or sharpening the blades, as they are sharp.

Blade sharpening

If the edges are rounded and do not cut well any more, grind off only the shaded
portions. Do not grind the contact surfaces (sliding surfaces) of the top and bottom
edges.
- Before grinding, be sure to secure the blade firmly and switch off the engine and
remove the spark plug cap.
- Wear gloves, protective glasses, etc.
- An edge ground too much at a time or ground many times will lose its hardened
layer. It becomes rounded and dull very quickly in use.

Blade adjustment

The blades will wear with long use. When you find that trimming is not as good as
when the blades were new, adjust them as follows.
1. Turn nut ① loose.
2. Bolt ② in with the driver lightly till it stops turning, and then screw it back one
quarter.
3. Turn nut ① tight, holding bolt ② at the same time with a Hex Wrench.
4. Lubricate the blades after adjustments above with light oil.
5. Start the engine and operate the engine throttle on and off for a minute.
6. Stop the engine and touch the blades with your hand. If they are warm enough for
you to keep your hand on, then you have made the proper adjustment. If they are
too hot for you to keep touching, give bolt ② a little more turnback and repeat 5 to
see if they are properly adjusted.
NOTE: Never fail to stop the engine before making the adjustment.
The blades have a slot around screw ②. In case you find dust in the end of any of the slots, clean it.
NOTE: For enough time of blade stop (EN774), be sure to make the blade adjustment before operation.
① Hexagonal U nut
② Truss bolt
③ Blade guide
④ Upper blade
⑤ Lower blade
①
③
④
⑤
②
Disk grinder
②
①
1
10° 10°
45°
Edge cross
section
Holding the disk grinder at
a 45° angle, grind the edge
off to the dotted line to
sharpen the rounded tip.