Bosch Power Tools 4412 manual Troubleshooting, Care of Blades, Tool Lubrication, Bearings

of these are: gasoline, carbon tetrachloride, chlori- nated cleaning solvents, ammonia and household detergents that contain ammonia.

Care of Blades

Blades become dull even from cutting regular lumber. If you find yourself forcing the saw forward to cut instead of just guiding it through the cut, chances are the blade is dull or coated with wood pitch.

When cleaning gum and wood pitch from blade, unplug the saw and remove the blade. Remember, blades are designed to cut, so handle carefully. Wipe the blade with kerosene or similar solvent to remove the gum and pitch. Unless you are experienced in sharpening blades, we recommend you do not try.

Tool Lubrication

Your Bosch tool has been properly lubricated and is ready to use. It is recommended that tools with gears be regreased with a special gear lubricant at every brush change.

Periodically lubricate moving parts with a silicone, or light oil spray. Do not use grease because it tends to attract and hold sawdust.

Bearings

All bearings in this tools are lubricated with a suffi- cient amount of high grade lubricant for the life of the unit under normal operating conditions. No further lubrication is required.

Troubleshooting

Troubleshooting Guide - Electrical

PROBLEM		CAUSE		CORRECTIVE ACTION
Brake does not stop blade in	1.	Brushes not seated or lightly	-	Inspect/clean or replace
about 5 seconds		sticking or worn.		brushes (see Maintenance
				Section).
	2.	Motor overheated from use	-	Use sharp blade.
		of dull blade/too heavy of a	- Use a recommended blade.
		blade, not recommended	- Let saw cool down.
		accessory or rapid on/off
		cycling.
	3.	Blade bolt loose.	-	Tighten blade bolt.
	4.	Other	-	Authorized service
Motor does not start.	1.	Check that unit is plugged in.	-	Plug unit in. Use different
				outlet.
	2.	Power source fuse or	- 15-Amp time delay fuse or
		time delay fuse.		circuit breaker.
	3.	Brushes worn.	- See Brush Replacement in
				the Maintenance and Lubri-
				cation section.
	4. Handle not in usable position.		- Lock handle into one of the
				four usable positions.
	5.	Other.	-	Authorized service.
Flash of light from motor endcap	1.	Normal - brake working
when switch is released.		properly.

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