Bosch Power Tools 4405 manual Maintenance and Lubrication

! WARNING

Maintenance and Lubrication

Service

Preventive maintenance performed by unauthorized personnel may

result in misplacing of internal wires and components which could cause serious hazard. We recommend that all tool service be performed by a Bosch Factory Service Center or Authorized Bosch Service Station. Call 1-877-BOSCH99 to locate a service center.

Carbon Brushes

The brushes and commutator in your tool have been engineered for many hours of dependable service. To maintain peak efficiency of the motor, we recom- mend every two to six months the brushes be exam- ined. Only genuine Bosch replacement brushes spe- cially designed for your tool should be used.

Motor Brush Replacement

To Inspect or Replace Brushes:

NOTE: If installing the existing brush or brushes, make sure the brush goes in the same way it came out. Otherwise a break-in period will occur that will reduce motor performance and increase brush wear.

1.Unplug the saw.

! WARNING	The brush cap is spring loaded by
	the brush assembly.

2.Remove the brush cap on the motor using a wide flat blade screwdriver.

3.Pull out the brush (Figure 37). Repeat for the opposite side.

4.Inspect brushes for wear. On the wide flat side of brush is a wear limit line. If the brush contact face is at or beyond (no line visible) the limit replace brushes as a set.

5.Install new brush. The two (2) tabs on the brush terminal go in the same hole the carbon part fits into.

6.Tighten the brush cap but do not overtighten.

Brush	Brush	Wear Line
Terminal

Figure 37. Motor Brush

	Cleaning
	To avoid accidents, always discon-
! WARNING
	nect the tool from the power supply

before cleaning or performing any maintenance. The tool may be cleaned most effectively with com- pressed air. Always wear safety goggles when clean- ing tools with compressed air.

Ventilation openings and switch levers must be kept clean and free of foreign matter. Do not attempt to clean by inserting pointed objects through openings.

Check regularly to make sure the lower guard and all moving parts are working properly.

Remove accumulated sawdust from working parts by blowing with compressed air or wiping with a damp cloth.

!WARNING Certain cleaning agents and sol- vents damage plastic parts. Some

of these are: gasoline, carbon tetrachloride, chlori- nated cleaning solvents, ammonia and household detergents that contain ammonia. Ammonia should never be used on aluminum.

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. We recommend that this service be performed by a Bosch Factory Service Center or Authorized Bosch Service Station. Call 1-877- BOSCH99 to locate a service center.

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 tool are lubricated with a sufficient amount of high grade lubricant for the life of the unit under normal operating conditions. No further lubri- cation is required.

32.