Bosch GCM12SD Manual Del Usuario página 51

BM 2610007877 08-10:BM 2610007877 08-10.qxp 8/24/10 1:05 PM Page 51
Maintenance and Lubrication
WARNING
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.
Motor 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 recommend
every 2-6 months the brushes be examined. Only
genuine Bosch replacement brushes specially
designed for your tool should be used.
Motor Brush Replacement
To inspect or replace brushes:
1. Unplug the saw.
WARNING
2. Remove the brush cap on the motor using a wide,
flat-blade screwdriver.
3. Pull out the brush (see Figure 64). Repeat for the
opposite side.
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.
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.
terminal go in the same hole the carbon part fits into.
6. Tighten the brush cap but do not overtighten.
figure 64. Motor Brush
Service
preventive maintenance performed
by unauthorized personnel may
The brush cap is spring-loaded
by the brush assembly.
The two tabs on the brush
Drive Belt
The drive belt is a long life component; however, after
extensive use, it may require cleaning or replacement.
Dust and debris may enter through the ventilation
system and affect the performance of the belt.
Periodically, the drive belt should be inspected for
excessive wear. If the belt shows signs of drying out,
cracking or tearing, it should be replaced. If the belt will
not track properly or comes off the pulleys, it should be
replaced. Belt replacement should only be
performed by an authorized service center.
Cleaning / Inspecting Drive Belt:
1. Unplug the saw.
2. Remove the two belt cover screws using a #2
Phillips screwdriver.
figure 65. Drive Belt
3. Clean area with a brush or compressed air.
4. Inspect the belt. If dried out, cracked or
excessively loose, it may require service and/or
replacement.
To avoid possible injury, do not
WARNING
attempt to replace the drive belt
(replacement requires special tools). Take saw to
an authorized Bosch service center.
5. Replace belt cover and two cover screws.
51.
Drive Belt