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pact rate almost constant when alternating between no-load
and loaded operation.
– Select the impact rate with the thumbwheel (9) according
to the material.
Changing the Chiselling Position (Vario-Lock)
You can lock the chisel in 16 different positions, allowing
you to select the optimum working position for each task.
– Turn the chisel adjustment switch (3) to the
Changing the Chiselling Position (Vario-
Lock) position.
– Insert the chisel into the tool holder and turn the chisel to
the required position.
– Turn the chisel adjustment switch (3) to the
Chiselling position and turn the chisel until
it audibly clicks into place.
Working Advice
Sharpening Chisels
Only sharp chiselling tools will produce good results, there-
fore sharpen your chiselling tools in good time before use.
This will ensure a long service life for the tools and good
work results.
Re-sharpening
Grind chiselling tools against sanding discs, e.g. aluminium
oxide, under a steady stream of water. Make sure that the
cutting edges show no annealing colours; this will impair the
hardness of the chiselling tools.
To forge a chisel, heat it to 850–1050 °C (pale red to yel-
low).
To harden a chisel, heat it to approx. 900 °C and quench in
oil. Then, leave it in an oven for approx. one hour at 320 °C
(annealing colour: pale blue).
Vibration damping
The integrated vibration damping function re-
duces the generated vibration.
Do not continue to use the power tool if the damping
u
element is damaged.
Maintenance and Service
Maintenance and Cleaning
Pull the plug out of the socket before carrying out any
u
work on the power tool.
To ensure safe and efficient operation, always keep
u
the power tool and the ventilation slots clean.
In order to avoid safety hazards, if the power supply cord
needs to be replaced, this must be done by Bosch or by an
Bosch Power Tools
after-sales service centre that is authorised to repair Bosch
power tools.
Replace a damaged dust protection cap immediately.
u
It is recommended that you have use an after-sales
service for this.
Lubrication
The power tool is lubricated with grease and is ready for im-
mediate use.
The lubricating grease should only be changed during main-
tenance or commissioning carried out by an after-sales ser-
vice centre authorised to work with Bosch power tools. It is
crucial that only lubricating grease provided by Bosch is
used.
The lubricating grease must be changed every time the car-
bon brushes are replaced. The old lubricating grease must
be removed before new lubricating grease is applied.
Service indicator
When the carbon brushes are worn out, the power tool
switches itself off. This is indicated approx. eight hours be-
forehand by the service indicator (8) lighting up or flicker-
ing.
The power tool must be sent to customer service for main-
tenance. For addresses, see: (see "After-Sales Service and
Application Service", page 13)
After-Sales Service and Application Service
Our after-sales service responds to your questions concern-
ing maintenance and repair of your product as well as spare
parts. You can find explosion drawings and information on
spare parts at: www.bosch-pt.com
The Bosch product use advice team will be happy to help you
with any questions about our products and their accessor-
ies.
In all correspondence and spare parts orders, please always
include the 10‑digit article number given on the nameplate
of the product.
Great Britain
Robert Bosch Ltd. (B.S.C.)
P.O. Box 98
Broadwater Park
North Orbital Road
Denham Uxbridge
UB 9 5HJ
At www.bosch-pt.co.uk you can order spare parts or arrange
the collection of a product in need of servicing or repair.
Tel. Service: (0344) 7360109
E-Mail: boschservicecentre@bosch.com
You can find further service addresses at:
www.bosch-pt.com/serviceaddresses
Disposal
The power tool, accessories and packaging should be re-
cycled in an environmentally friendly manner.
English | 13
1 609 92A 8M5 | (07.02.2023)
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