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USER MANUAL GSB 202 RET Professional BOSCH
OBJ_DOKU-2026-002 fm Page 1 Tuesday, October 23, 2007 2:56 PM
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Illustration of a Bosch electric drill with handle and screwdriver (no text or symbols)Robert Bosch GmbH
Power Tools Division
70745 Leinfelden Echterdingen
www.bosch-pt.com
1 609 929 M40 (2007.10) O / 90
GSB Professional
20-2 | 20-2 RE | 20-2 RCE | 20-2 RET
BOSCH
us Original operating instructions
cn正本使用说明书
tw日本使用説明書
kr사을 선당서 원문
th
GSB 20-2 RET Professional
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A x 13 11 12
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B 1 ① ②1 609 929 M40 | (23.10.07) Bosch Power Tools
5
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C 14 2 1 15
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D 16 17
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E Ø 4 mm 18 1
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F Ø 4 mm 1 18
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G 5
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H 51 609 929 M40 | (23.10.07) Bosch Power Tools
6 | English
General Power Tool Safety Warnings
WARNING
Read all safety warnings and all instructions. Failure to follow
the warnings and instructions may result in electric shock, fire and/or serious injury.
Save all warnings and instructions for future reference.
The term "power tool" in the warnings refers to your mains-operated (corded) power tool or battery-operated (cordless) power tool.
1) Work area safety
a) Keep work area clean and well lit. Cluttered or dark areas invite accidents.
b) Do not operate power tools in explosive atmospheres, such as in the presence of flammable liquids, gases, or dust. Power tools create sparks which may ignite the dust or fumes.
c) Keep children and bystanders away while operating a power tool. Distractions can cause you to lose control.
2) Electrical safety
a) Power tool plugs must match the outlet. Never modify the plug in any way. Do not use any adapter plugs with earthed (grounded) power tools. Unmodified plugs and matching outlets will reduce the risk of electric shock.
b) Avoid body contact with earthed or grounded surfaces, such as pipes, radiators, ranges and refrigerators. There is an increased risk of electric shock if your body is earthed or grounded.
c) Do not expose power tools to rain or wet conditions. Water entering a power tool will increase the risk of electric shock.
d) Do not abuse the cord. Never use the cord for carrying, pulling or unplugging the power tool. Keep cord away from heat, oil, sharp edges or moving parts. Damaged or entangled cords increase the risk of electric shock.
e) When operating a power tool outdoors, use an extension cord suitable for outdoor use. Use of a cord suitable for outdoor use reduces the risk of electric shock.
f) If operating a power tool in a damp location is unavoidable, use a ground fault circuit interrupter (GFCI) or an earth leakage circuit breaker (ELCB). Use of a GFCI or an ELCB reduces the risk of electric shock.
3) Personal safety
a) Stay alert, watch what you are doing and use common sense when operating a power tool. Do not use a power tool while you are tired or under the influence of drugs, alcohol, or medication. A moment of inattention while operating power tools may result in serious personal injury.
b) Use personal protective equipment. Always wear eye protection. Protective equipment such as dusk mask, non-skid safety shoes, hard hat or hearing protection used for appropriate conditions will reduce personal injuries.
c) Prevent unintentional starting. Ensure the switch is in the off position before connecting to power source and/or battery pack, picking up or carrying the tool. Carrying power tools with your finger on the switch or energizing power tools that have the switch on invites accidents.
d) Remove any adjusting key or wrench before turning the power tool on. A wrench or a key that is left attached to a rotating part of the power tool may result in personal injury.
e) Do not overreach. Keep proper footing and balance at all times. This enables better control of the power tool in unexpected situations.
f) Dress properly. Do not wear loose clothing or jewelry. Keep your hair, clothing, and gloves away from moving parts.
Loose clothes, jewelry, or long hair can be caught in moving parts.
g) If devices are provided for the connection of dust extraction and collection facilities, ensure these are connected and properly used. Use of dust collection can reduce dust-related hazards.
4) Power tool use and care
a) Do not force the power tool. Use the correct power tool for your application. The correct power tool will do the job better and safer at the rate for which it is designed.
b) Do not use the power tool if the switch does not turn it on or off. Any power tool that cannot be controlled with the switch is dangerous and must be repaired.
c) Disconnect the plug from the power source and/or the battery pack from the power tool before making any adjustments, changing accessories, or storing power tools. Such preventive safety measures reduce the risk of starting the power tool accidentally.
d) Store idle power tools out of the reach of children and do not allow persons unfamiliar with the power tool or these instructions to operate the power tool. Power tools are dangerous in the hands of untrained users.
e) Maintain power tools. Check for misalignment or binding of moving parts, breakage of parts and any other condition that may affect the power tool's operation. If damaged, have the power tool repaired before use. Many accidents are caused by poorly maintained power tools.
f) Keep cutting tools sharp and clean. Properly maintained cutting tools with sharp cutting edges are less likely to bind and are easier to control.
g) Use the power tool, accessories, tool bits etc. in accordance with these instructions, taking into account the working conditions and the work to be performed. Use of the power tool for operations different from those intended could result in a hazardous situation.
5) Service
a) Have your power tool serviced by a qualified repair person using only identical replacement parts. This will ensure that the safety of the power tool is maintained.
Power Tool-specific Safety Warnings
▶ Wear hearing protection when using impact drills. The influence of noise can lead to loss of hearing.
▶ Use the auxiliary handle supplied with the power tool. Loss of control over the power tool can cause personal injury.
▶ Use suitable detectors to determine if utility lines are hidden in the work area or call the local utility company for assistance. Contact with electric lines can lead to fire and electric shock. Damaging a gas line can lead to explosion. Penetrating a water line causes property damage.
▶ Switch off the power tool immediately when the tool insert jams. Be prepared for high reaction torque that can cause kickback. The tool insert jams when:
- the power tool is subject to overload or - it becomes wedged in the workpiece.
Hold the power tool only by the insulated gripping surfaces when performing an operation where the cutting tool may contact hidden wiring or its own power cord. Contact with a "live" wire will also make exposed metal parts of the power tool "live" and shock the operator.
When working with the power tool, always hold it firmly with both hands and provide for a secure stance. The power tool is guided more secure with both hands.
- Secure the workpiece. A workpiece clamped with clamping devices or in a vice is held more secure than by hand.
▶ Do not work materials containing asbestos.
Asbestos is considered carcinogenic.
8 | English
Take protective measures when dust can develop during working that is harmful to one's health, combustible or explosive. Example: Some dusts are regarded as carcinogenic. Wear a dust mask and work with dust/chip extraction when connectable.
- Keep your workplace clean. Blends of materials are particularly dangerous. Dust from light alloys can burn or explode.
▶ Always wait until the power tool has come to a complete stop before placing it down. The tool insert can jam and lead to loss of control over the power tool.
Do not use the power tool with a damaged cord. Do not touch the damaged cord and pull the plug from the outlet when the cord is damaged while working. Damaged cords increase the risk of an electric shock.
Functional Description
Read all safety warnings and all instructions. Failure to follow the warnings and instructions may result in electric shock, fire and/or serious injury.
While reading the operating instructions, unfold the graphics page for the tool and leave it open.
Intended Use
The machine is intended for impact drilling in brick, concrete and stone as well as for drilling in wood, metal and plastic. Machines with electronic control and right/left rotation are also suitable for driving screws in/out and thread-cutting.
Product Features
The numbering of the product features refers to the illustration of the power tool on the graphics page.
1 Keyless chuck
2 "Drilling/Impact Drilling" selector switch
3 Speed dial for electronic speed preselection (GSB 20-2 RCE/GSB 20-2 RET)
4 "Drilling/screwdriving" selector switch (GSB 20-2 RET)
5 Rotational direction switch(GSB 20-2 RE/GSB 20-2 RCE/GSB 20-2 RET)
6 Soft grip
7 On/Off switch
8 Dial control for speed preselection (GSB 20-2 RE)
9 Lock-on button for On/Off switch
10 Gear selection lever
11 Button for depth stop adjustment
12 Auxiliary handle*
13 Depth stop*
14 Chuck key
15 Key-type drill chuck
16 Screwdriver bit*
17 Universal bit holder*
18 Hex key**
*The accessories illustrated or described are not included as standard delivery.
**Commercially available (not included in the delivery scope)
Technical Data
| Hammer Drill GSB ... | Professional | 20-2 | 20-2 RE | 20-2 RE | 20-2 RCE | 20-2 RET |
| Article number | 0 601 ... | 19B 0.. 19B | 4.. 19B 5.. | 19B 7.. | 19B 9.. | |
| Rated power input | W | 7 | 5 | 0 | 800 800 1010 | 1010 |
| Output power | W | 3 | 5 | 0 | 420 420 475 | 475 |
| No-load speed | ||||||
| - 1st gear | rpm | 1100 | 0 - 1100 | 0 - 1100 | 0 - 1100 | 0 - 1100 |
| - 2nd gear | rpm | 3000 | 0 - 3000 | 0 - 3000 | 0 - 3000 | 0 - 3000 |
| Rated speed | ||||||
| - 1st gear | rpm | 740 | 0 - 740 | 0 - 740 | 0 - 1100 | 0 - 1100 |
| - 2nd gear | rpm | 1 930 | 0 - 1 930 | 0 - 1 930 | 0 - 3 000 | 0 - 3 000 |
| Impact frequency at no-load | bpm | 48000 | 48000 | 48000 | 48000 | 48000 |
| Rated torque (1st/2nd gear) | Nm | 4.4/1.7 | 5.2/2.0 | 5.2/2.0 | 3.9/1.5 | 3.9/1.5 |
| Electronic torque control | - | - | - | - | ||
| Speed Preselection | - | ● | ● | ● | ||
| Constant electronic control | - | - | - | ● | ● | |
| Right/left rotation | - | ● | ● | ● | ||
| Dual gear feature | ● | ● | ● | ● | ||
| Key-type drill chuck | ● | ● | - | - | - | |
| Keyless drill chuck | - | - | ● | ● | ● | |
| Fully Automatic SpindleLocking (Auto-lock) | - | - | ● | ● | ● | |
| Spindle collar dia. | mm | 43 | 43 | 43 | 43 | 43 |
| Maximum drilling diameter(1st/2nd gear) | ||||||
| - Brickwork | mm | 22/16 | 22/16 | 22/16 | 22/16 | 22/16 |
| - Concrete | mm | 20/13 | 20/13 | 20/13 | 20/13 | 20/13 |
| - Steel | mm | 13/8 | 13/8 | 13/8 | 16/8 | 16/8 |
| - Wood | mm | 40/25 | 40/25 | 40/25 | 40/25 | 40/25 |
| Chuck clamping range | mm | 1.5-13 | 1.5-13 | 1.5-13 | 1.5-13 | 1.5-13 |
| Weight according toEPTA-Procedure 01/2003 | kg | 2.5 | 2.5 | 2.5 | 2.6 | 2.6 |
| Protection class | □/□ | □/□ | □/□ | □/□ | □/□ |
The values given are valid for nominal voltages [U] of 230/240 V. For lower voltages and models for specific countries, these values can vary.
Please observe the article number on the type plate of your power tool. The trade names of individual tools may vary.
10 | English
Assembly
Auxiliary Handle (see figure A)
▶ Operate your power tool only with the auxiliary handle 12.
The auxiliary handle 12 can be set to any position for a secure and low-fatigue working posture.
Turn the bottom part of the auxiliary handle 12 in counterclockwise direction and swivel the auxiliary handle 12 to the desired position. Then re-tighten the bottom part of the auxiliary handle 12 by turning in clockwise direction.
Adjusting the Drilling Depth (see figure A)
The required drilling depth X can be set with the depth stop 13.
Press the button for the depth stop adjustment 11 and insert the depth stop into the auxiliary handle 12.
Pull out the depth stop until the distance between the tip of the drill bit and the tip of the depth stop correspond with the desired drilling depth X.
The knurled surface of the depth stop 13 must face upward.
Changing the Tool
▶ Before any work on the power tool itself, pull the mains plug.
Keyless Chuck (see figure B)
The drill spindle is locked when the On/Off switch 7 is not pressed. This makes quick, convenient and easy changing of the tool in the drill chuck possible.
Open the keyless chuck 1 by turning in rotation direction ① until the tool can be inserted. Insert the tool.
Firmly tighten the collar of the keyless chuck 1 by hand in rotation direction ② until the locking action ("click") is no longer heard. This automatically locks the chuck.
The locking is released again to remove the tool when the collar is turned in the opposite direction.
Key-type Drill Chuck (see figure C)
▶ Wear protective gloves when changing the tool. The drill chuck can become very hot during longer work periods.
Open the key-type drill chuck 15 by turning until the tool can be inserted. Insert the tool.
Insert the chuck key 14 into the corresponding holes of the key-type drill chuck 15 and clamp the tool uniformly.
Screwdriver Tools (see figure D)
When working with screwdriver bits 16, a universal bit holder 17 should always be used. Use only screwdriver bits that fit the screw head.
For driving screws, always position the "Drilling/Impact Drilling" selector switch 2 to the "Drilling" symbol.
Replacing the Drill Chuck
▶ Before any work on the power tool itself, pull the mains plug.
For power tools without spindle lock, the drill chuck must be replaced by an authorized after-sales service agent for Bosch power tools.
Removing the Drill Chuck (see figure E)
Disassemble the auxiliary handle and set the gear selector 10 to the center position between the 1st and 2nd gear.
Insert a steel pin with a diameter of ∅ 4 mm and approx. 50 mm of length into the drill hole on the spindle neck in order to lock the drill spindle.
Clamp the short end of a hex key 18 into the key-less chuck 1.
Place the machine on a stable surface (e. g. a workbench). Hold the machine firmly and loosen the keyless chuck 1 by turning the hex key 18 in rotation direction 0. Loosen a tight-seated keyless chuck by giving the long end of the hex key 18 a light blow. Remove the hex key from the keyless chuck and completely unscrew the keyless chuck.
Mounting the Drill Chuck (see figure F)
The keyless chuck is mounted in reverse order.
- Remove the steel pin from the drill hole on the spindle neck after mounting is completed.
The drill chuck must be tightened with a tightening torque of approx. 35–40 Nm.
Operation
Starting Operation
▶ Observe correct mains voltage! The voltage of the power source must agree with the voltage specified on the type plate of the power tool.
Reversing the Rotational Direction (see figures G-H) (GSB 20-2 RE/GSB 20-2 RCE/GSB 20-2 RET)
▶ Actuate the rotational direction switch 5 only when the power tool is at a standstill.
The rotational direction switch 5 is used to reverse the rotational direction of the machine. However, this is not possible with the On/Off switch 7 actuated.
Right rotation: For drilling and driving in screws, push the rotational direction switch 5 downward on the left side and at the same time upward on the right side.
Left rotation: For loosening and unscrewing screws and nuts, push the rotational direction switch 5 upward on the left side and at the same time downward on the right side.
Setting the Operating Mode
Drilling and Screwdriving
Set the selector switch 2 to the "Drilling" symbol.
Hammer Drilling
Set the selector switch 2 to the "Hammer drilling" symbol.
The selector switch 2 engages noticeably and can also be actuated with the machine running.
Gear Selection, Mechanical
The gear selector 10 can be actuated at standstill or when the machine is running. However, this should not be done while operating at full load or maximum speed.
Two speed ranges can be preselected with the gear selection lever 10.
Gear I:
Low speed range; for working with large drilling diameter or for driving in screws.
Gear II:
High speed range; for working with small drilling diameter.
If the gear selection lever 10 cannot be fully engaged, lightly rotate the drill bit by twisting the drill chuck.
Switching On and Off
To start the power tool, press the On/Off switch 7 and keep it pressed.
To lock the pressed On/Off switch 7, press the lock-on button 9.
To switch off the power tool, release the On/Off switch 7 or when it is locked with the lock-on button 9, briefly press the On/Off switch 7 and then release it.
Overload Clutch
ANTI ROTATION
To limit dangerous reaction torque, the machine is equipped with a safety clutch (anti-rotation).
▶ If the tool insert becomes caught or jammed, the drive to the drill spindle is interrupted. Because of the forces that occur, always hold the power tool firmly with both hands and provide for a secure stance.
▶ If the power tool jams, switch the machine off and loosen the tool insert. When switching the power tool on with the drilling tool jammed, high reaction torques can occur.
12 | English
Adjusting the Speed/Impact Frequency (GSB 20-2 RE/GSB 20-2 RCE/GSB 20-2 RET)
The speed/impact rate of the switched on power tool can be variably adjusted, depending on how far the On/Off switch 7 is pressed.
Light pressure on the On/Off switch 7 results in low speed/impact rate. Further pressure on the switch increases the speed/impact rate.
Preselecting the Speed/Impact Frequency (GSB 20-2 RE)
With the dial control for speed preselection 8, the required speed/impact frequency can be pre-selected even during operation.
The required speed/impact frequency depends on the material and the working conditions, and can be determined through practical testing.
Electronic Speed Preselection (GSB 20-2 RCE/GSB 20-2 RET)
With the speed dial for electronic speed preselection 3, the required speed/impact frequency can be selected even if the machine is running.
The required speed/impact frequency depends on the material and the working conditions, and can be determined through practical testing.
Constant Electronic Control (GSB 20-2 RCE/GSB 20-2 RET)
The constant electronic control keeps the preselected speed and impact rate nearly constant between no-load and load conditions.
Electronic Torque Limitation/Speed Preselection (Torque Control) (GSB 20-2 RET)
Drilling with speed preselection: Set the selector switch 4 to the "Drilling" symbol. The required speed can be selected with the speed dial 3; it can also be adjusted during operation.
Screwdriving with torque limitation:
Set the selector switch 4 to the "Screwdriving" symbol. The effective torque at the drill spindle can be variable adjusted with the dial control 3 during operation:
I=low torque, III=high torque.
The maximum speed is automatically adapted to the adjusted torque.
If the preselected torque is reached during screwdriving, the machine switches off; the drilling tool no longer rotates. If the load on the machine is then removed with the On/Off switch 7 still pressed, the drilling tool continues to run only at very low speed for safety reasons. After briefly releasing the On/Off switch 7, the next screw can be driven in with the same torque.
For screwdriving without torque limitation, turn the speed dial 3 to the right stop. This setting is required, when the torque in position III is not sufficient.
Working Instructions
▶ Apply the power tool to the screw/nut only when it is switched off. Rotating tool inserts can slip off.
Tips
After longer periods of working at low speed, allow the machine to cool down by running it for approx. 3 minutes at maximum speed with no load.
For drilling in tiles, set the selector switch 2 to the "Drilling" symbol. Do not switch over to the symbol "Impact Drilling" or work with impact until after drilling through the tile.
Use carbide tipped drill bits when working in concrete, masonry and brick wall.
For drilling in metal, use only perfectly sharpened HSS drill bits (HSS = High Speed Steel). The appropriate quality is guaranteed by the Bosch accessories program.
Twist drills from 2.5–10 mm can easily be sharpened with the drill bit sharpener (see accessories).
Soft Grip
The gripping surface (soft grip) 6 reduces the danger of slipping and thereby improves the grip on the machine and the handling.
At the same time, the rubber coating achieves a vibration-reducing effect.
Maintenance and Service
Maintenance and Cleaning
Before any work on the power tool itself, pull the mains plug.
For safe and proper working, always keep the power tool and the ventilation slots clean.
If the power tool should fail despite the care taken in manufacturing and testing procedures, repair should be carried out by an after-sales service center for Bosch power tools.
In all correspondence and spare parts orders, please always include the 10-digit article number given on the type plate of the power tool.
After-sales service and customer assistance
Our after-sales service responds to your questions concerning maintenance and repair of your product as well as spare parts. Exploded views and information on spare parts can also be found under:
www.bosch-pt.com
Our customer consultants answer your questions concerning best buy, application and adjustment of products and accessories.
In case of a claim, repair or purchase of replacement parts or in case of queries or other problems, please contact your local dealer or Bosch representative.
People's Republic of China
Website: www.bosch-pt.com.cn
China Mainland
Bosch Power Tools (China) Co., Ltd.
567, Bin Kang Road
Bin Jiang District 310052
Hangzhou, P.R.China
Service Hotline: 800 8 20 84 84
Tel.: +86 (571) 87 77 43 38
Fax: +86 (571) 87 77 45 02
HK and Macau Special Administrative Regions
Melchers (H.K.) Ltd, Room 1210
Shun Tak Centre, West-Tower
168 - 200 Connaught Road, Central Hong Kong
Customer Service Hotline: +852 (25) 89 15 61
Fax: +852 (25) 48 79 14
E-Mail: bosch@melchers.com.hk
Indonesia
PT. Multi Tehaka
Kawasan Industri Pulogadung
Jalan Rawa Gelam III No. 2
Jakarta 13930
Indonesia
Tel.: +62 (21) 4 60 12 28
Fax: +62 (21) 46 82 68 23
E-Mail: sales@multitehaka.co.id
www.multitehaka.co.id
Phillippines
Robert Bosch, Inc.
Zuellig Building
Sen. Gil Puyat Avenue
Makati City 1200, Metro Manila
Philippines
Tel.: +63 (2) 8 17 32 31
www.bosch.com.ph
14 | English
Malaysia
Robert Bosch (SEA.) Pte. Ltd.
No. 8a, Jalan 13/6
46200 Petaling Jaya,
Selangor,
Malaysia
Tel.: +6 (03) 7966 3000
Fax: +6 (03) 7958 3838
E-Mail: hengsiang.yu@my.bosch.com
Toll Free tel.: 1 800 880 188
Fax: +6 (03) 7958 3838
www.bosch.com.sg
Thailand
Robert Bosch Ltd.
Liberty Square Building
No. 287, 11 Floor
Silom Road, Bangrak
Bangkok 10500
Tel.: +66 (2) 6 31 18 79 - 18 88 (10 lines)
Fax: +66 (2) 2 38 47 83
Robert Bosch Ltd., P. O. Box 2054
Bangkok 10501, Thailand
Bosch Service – Training Centre
2869-2869/1 Soi Ban Kluay
Rama IV Road (near old Paknam Railway)
Prakanong District
10110 Bangkok
Thailand
Tel.: +66 (2) 6 71 78 00 - 4
Fax: +66 (2) 2 49 42 96
Fax: +66 (2) 2 49 52 99
Singapore
Robert Bosch (SEA.) Pte. Ltd.
38 C Jalan Pemimpin
Singapore 915701
Republic of Singapore
Tel.: +65 (3) 50 54 94
Fax: +65 (3) 50 53 27
www.bosch.com.sg
Vietnam
Robert Bosch (SEA) Pte. Ltd - Vietnam
Representative Office
Saigon Trade Center, Suite 1206
37 Ton Duc Thang Street,
Ben Nghe Ward, District 1
HCMC
Vietnam
Tel.: +84 (8) 9111 374 - 9111 375
Fax: +84 (8) 9111376
Australia, New Zealand and Pacific Islands
Robert Bosch Australia Pty. Ltd.
Power Tools
Locked Bag 66
Clayton South VIC 3169
Customer Contact Center
Inside Australia:
Phone: +61 (01300) 307 044
Fax: + 61 (01300) 307 045
Inside New Zealand:
Phone: +64 (0800) 543 353
Fax: +64 (0800) 428 570
Outside AU and NZ:
Phone: +61 (03) 9541 5555
www.bosch.com.au
Disposal
Power tools, accessories and packaging should be sorted for environmental-friendly recycling.
Subject to change without notice.
针对电动工具的一般性警告提示
警告
阅读所有的警告提示和指示。如未确实
遵循警告提示和指示，可能导致电击、火灾
並且 / 或其他的严重伤害。
Robert Bosch Korea Mechanics and Electronics Ltd.
선동공구 사업부
Jalan Rawa Gelam III No. 2
Jakarta 13930
Indonesia
Tel.: +62 (21) 4 60 12 28
Fax: +62 (21) 46 82 68 23
E-Mail: sales@multitehaka.co.id
www.multitehaka.co.id
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