GBH 3-28 DFR Professional - Drill BOSCH - Free user manual and instructions
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| Product type | Hammer drill with SDS-plus chuck |
| Brand | Bosch Professional |
| Model | GBH 3-28 DFR |
| Category | Hammer drill |
| Power supply | Corded, 230 V AC |
| Power input | 850 W |
| Power output | 460 W |
| Drilling capacity (concrete) | 28 mm |
| Drilling capacity (wood) | 30 mm |
| Drilling capacity (steel) | 13 mm |
| No-load speed (1st gear) | 0-900 rpm |
| No-load speed (2nd gear) | 0-3000 rpm |
| No-load impact rate | 0-4000 bpm |
| Impact energy per stroke | 3.2 J (according to EPTA 05/2009) |
| Weight | 3.4 kg |
| Dimensions (L x W x H) | 390 x 95 x 220 mm |
| Collar diameter | 43 mm |
| Chuck type | SDS-plus |
| Operating modes | Drilling, hammer drilling, chiseling |
| Variable speed | Yes (preselection thumbwheel) |
| On/off switch with lock | Yes |
| Rotation direction | Left/right |
| Auxiliary handle | Yes (removable) |
| Depth stop | Yes |
| Restart protection | No (standard model) |
| Maintenance | Regularly clean the ventilation slots and the SDS-plus chuck |
| Spare parts available | Carbon brushes, chuck, handle, depth stop (repairability ensured by Bosch after-sales service) |
| Included accessories | Auxiliary handle, depth stop, measuring tool |
| Certifications | CE, EPTA |
Frequently Asked Questions - GBH 3-28 DFR Professional BOSCH
How do I change the drill bit on the Bosch GBH 3-28 DFR Professional?
Use the SDS-plus chuck: pull the sleeve back, insert the bit, and release the sleeve. Check that the tool is securely locked.
What is the difference between the operating modes?
The mode selector allows you to choose: drilling (screws), hammer drilling (concrete), and chiseling (light demolition). Turn the selector to the desired icon.
How do I adjust the rotation speed?
Use the preselection thumbwheel on the switch. Turn it to choose a speed between minimum and maximum (0-900 or 0-3000 rpm depending on the selected gear).
How do I use the depth stop?
Insert the depth stop into the groove on the auxiliary handle, set the desired depth, and tighten the locking screw. This ensures constant depth holes.
What should I do if the SDS-plus chuck no longer holds the tool?
Clean the chuck and the tool with a dry cloth to remove dust. If the problem persists, lightly grease the tool with SDS grease and reinsert it. If still faulty, contact Bosch customer service.
What is the impact power of the GBH 3-28 DFR?
The impact energy is 3.2 joules according to EPTA 05/2009, suitable for drilling holes up to 28 mm in concrete.
How do I maintain the hammer drill?
Regularly clean the ventilation slots with a brush, and lubricate the SDS chuck with suitable grease. Have the carbon brushes checked by a professional if worn.
Can I use a standard cylindrical drill bit?
No, the SDS-plus chuck only accepts drill bits with an SDS-plus or SDS-max shank. For cylindrical bits, you need an SDS-plus to keyed chuck adapter (sold separately).
What should I do if the device does not start?
Check that the cable is plugged in and the socket works. Try resetting the circuit breaker. If the problem persists, the carbon brushes may be worn or the motor damaged; contact Bosch customer service.
Where can I find spare parts?
Spare parts (carbon brushes, chuck, handle, depth stop, etc.) are available from authorized Bosch dealers or via Bosch Professional online after-sales service.
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