Maintenance - Bosch 11387 Operating/Safety Instructions Manual

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"VARIO-LOCK"- SELECTOR RING
The vario-lock selector ring can be set in any
one of twelve (30˚ increments) positions.
Choose a position which is best suited for
your operation. To adjust, pull the selector
ring forward and hold firmly, then turn both
the accessory and the selector ring to the
desired position. Release the selector ring
and turn the accessory slightly until it locks in
place.
"TOOL TIPS"
For the best penetration rates in concrete,
run the tool with a steady pressure, but do
not use excessive force as this will decrease
the efficiency of the tool.
Service
Preventive maintenance
WARNING
performed by unauth-
orized personnel may result in misplacing
of internal wires and components which
could cause
recommend that all tool service be performed
by a Bosch Factory Service Center or Autho-
rized Bosch Service Station.
TOOL LUbRICATION
Your Bosch tool has been properly lubricated
and is ready to use. It is recommended that
tools with gears be lubricated with Bosch
lubricant at every brush change.
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 recommend every
two to six months the brushes be examined.
Only genuine Bosch replacement brushes
specially designed for your tool should be
used.
bEARINGS
Every second brush change, the bearings
should be replaced at Bosch Factory Service
Center or Authorized Bosch Service Station.
Bearings which become noisy (due to heavy

Maintenance

serious hazard.
All hammers require a short period of time to
warm up. Depending on the room
temperature, this time may vary from
approximately 15 seconds (90˚F) to 2
minutes (32˚F). A new hammer requires a
break-in period before full performance is
realized. This period may require up to 5
hours of operation.
An electric hammer is likely to be the most
expensive portable tool at the construction
job. The long wear and efficient operation of
the BOSCH hammers will more than justify
the cost for tools of this type. As earlier
pointed out, sharp accessories as well as
clean air vents are necessary for efficient
operation. Establish and follow a set
maintenance program.
load or very abrasive material cutting) should
be replaced at once to avoid overheating or
motor failure.
REPLACEMENT OF CORD AND
CARbON bRUSHES
We
Your is designed to provide a qualified
service technician optimal access to replace
the carbon brushes and the cord. This
provides the service technician the ability to
replace these components without the need
of disassembling the entire tool housing.
WARNING
the power supply before cleaning or
performing any maintenance. The tool may
be cleaned most effectively with compressed
dry air. Always wear safety goggles when
cleaning 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.
CAUTION
plastic parts. Some of these are: gasoline,
carbon tetrachloride, chlorinated cleaning
solvents, ammonia
detergents that contain ammonia.
-9-
Cleaning
To avoid accidents always
disconnect the tool from
Certain cleaning agents
and solvents damage
and household