Bosch GNA 3,5 Professional Original Instructions Manual page 7

Changing the die
Loosen and remove the two screws (9). Insert a new
die (14) and tighten it firmly with the screws.
Worn dies must not be reground.
Changing the guide plate
The guide plate (11) is used to protect the die holder (15).
To change the guide plate (11), remove the die (14) as de-
scribed above. Then loosen and remove the screws (13) on
the hold-down device. Remove the hold-down device (12)
and the guide plate.
Insert a new guide plate (11). Secure the die (14) with the
screws (9) and secure the hold-down device (12) with the
screws (13). Tighten all screws firmly.
Changing the punch
Insert the hex key (4) into the screw head of the punch posi-
tioner (16). Turn the punch positioner until the screw (7) is
in the exact centre of the hole (8) on the die holder. Remove
the hex key from the punch positioner.
Remove the die (14), the hold-down device (12) and the
guide plate (11) as described above.
Loosen the screw (7) on the punch fastener and pull the
punch (10) downwards out of the tool. Thoroughly lubricate
the new or reground punch and insert it from underneath.
Retighten the screw (7) on the punch fastener.
Attach the guide plate (11), the hold-down device (12) and
the die (14) as described above.
Regrinding the punch
Regrinding the punch in good time (e.g. with a diamond
grinding disc) can often prevent the punch (10) from chip-
ping. Severely damaged punches must not be reground.
The punch must not be reground by more than 1 mm. Grind-
ing must only be carried out on the cutting face and at ex-
actly 90° to the centre axis.
Gently sharpen the cutting edges of the punch using a fine
whetstone.
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.
Cambodia
Robert Bosch (Cambodia) Co., Ltd
Unit 8BC, GT Tower, 08th Floor, Street 169,
Czechoslovakia Blvd, Sangkat Veal Vong
Khan 7 Makara, Phnom Penh
VAT TIN: 100 169 511
Tel.: +855 23 900 685
Bosch Power Tools
Tel.: +855 23 900 660
www.bosch.com.kh
People's Republic of China
China Mainland
Bosch Power Tool (China) Co. Ltd.
Bosch Service Center
567, Bin Kang Road
Bin Kang District
Hangzhou, Zhejiang Province
China 310052
Tel.: (0571) 8887 5566 / 5588
Fax: (0571) 8887 6688 x 5566# / 5588#
E-Mail: bsc.hz@cn.bosch.com
www.bosch-pt.com.cn
HK and Macau Special Administrative Regions
Robert Bosch Co. Ltd.
Flat B, 2/F, Yeung Yiu Chung No. 6 Industrial Building,
19 Cheung Shun Street
Cheung Sha Wan
Kowloon, Hong Kong
Customer Service Hotline: +852 2101 0235
Fax: +852 2590 9762
E-Mail: info@hk.bosch.com
www.bosch-pt.com.hk
India
Bosch Service Center
69, Habibullah Road, (Next to PSBB School), T. Nagar
Chennai–600077
Phone: (044) 64561816
Bosch Service Center
18, Community Center
Phase 1, Mayapuri
New Delhi–110064
Phone: (011) 43166190
Indonesia
PT Robert Bosch
Palma Tower 10th Floor
Jalan RA Kartini II-S Kaveling 6
Pondok Pinang, Kebayoran Lama
Jakarta Selatan 12310
Tel.: (21) 3005-5800
www.bosch-pt.co.id
Malaysia
Robert Bosch Sdn. Bhd.(220975-V) PT/SMY
No. 8A, Jalan 13/6
46200 Petaling Jaya
Selangor
Tel.: (03) 79663194
Toll-Free: 1800 880188
Fax: (03) 79583838
E-Mail: kiathoe.chong@my.bosch.com
www.bosch-pt.com.my
Pakistan
Robert Bosch Middle East FZE – Pakistan Liaison Office
2nd Floor Plaza # 10, CCA Block, DHA Phase 5
Lahore, 54810
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