Maintenance And Lubrication - Bosch GCM12SD Instrucciones De Funcionamiento Y Seguridad

2610051827 GCM12SD 08-18.qxp_GCM12SD 9/19/18 2:52 PM Page 57
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.
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 re-
placement brushes specially designed for your
tool should be used.
Motor Brush Replacement
To inspect or replace brushes:
1.Unplug the saw.
sembly.
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
contactface is at or beyond (no line visible)
the limit, replace brushes as a set.
5.Install new brush. The two tabs on the brush
terminal go in the same hole the carbon part
fits into.
6.Tighten the brush cap but do not overtighten.

Maintenance and Lubrication

Service
Preventive maintenance
performed by unauthorized
The brush cap is spring-
loaded by the brush as-
Fig. 64
Fig. 65
Drive Belt
The drive belt is a long life component; however,
after extensive use, it may require cleaning or re-
placement. Dust and debris may enter through
the ventilation system and affect the perform-
ance of the belt. Periodically, the drive belt
should be inspected for excessive wear. If the
belt shows signs of drying out, cracking or tear-
ing, 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.
Drive Belt
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