Borelli Support for Bosch Group 3 Pumps – 25407 Series
The Borelli Support for Bosch Group 3 Pumps – 25407 Series provides reliable mechanical isolation and support for Bosch Group 3 hydraulic pumps. It features a dedicated 25007.18 housing, a 3210 A radial bearing, an A 35×31 DIN 5482 internal spline profile, a 1:5 tapered shaft end with an M16x1.5 thread, and a sealing system incorporating an OR 189 O-ring and a 40x52x7 oil seal. It absorbs radial loads of up to 170 daN, protecting the integrity of the pump’s primary shaft.
The available product and component codes are: 25407, 801600, 905000, 601615, 401890, 424751, 503210, 25007.18, 304052, AC03/B50, 25007/C.
The Borelli Support for Bosch Group 3 Pumps – 25407 Series is a mechanical assembly specifically designed for coupling and protecting Bosch Group 3 hydraulic pumps. Its primary function is to withstand external radial loads of up to 170 daN generated by auxiliary transmission components (such as pulleys or gears), preventing bending forces and misalignment from acting directly on the hydraulic pump shaft and its internal bearings.
The AC03/B50 shaft is the main rotating component of the assembly:
Rotation and dynamic load distribution are managed by the 3210 A bearing, installed inside the 25007.18 housing and axially secured by two UNI 7435-50 Seeger retaining rings and a 25007/C spacer ring. Protection against leakage and external contaminants is provided by:
The one-piece housing measures 127 mm in width, 172 mm in height and 114.5 mm in overall axial depth (housing body thickness of 71 mm). The through mounting holes have a diameter of Ø 11 mm and are arranged with center-to-center spacing of 102 mm horizontally and 145 mm vertically, ensuring structural rigidity and mounting flatness.
| Specification | Value |
|---|---|
| Main Series / Model | 25407 |
| Pump Application | Bosch Group 3 |
| Maximum Permissible Radial Load | 170 daN |
| Internal Spline Profile (Pump Coupling) | A 35×31 DIN 5482 |
| Output Shaft End | 1:5 tapered, M16x1.5 thread |
| Tapered Shaft Key | 4×7.5 UNI 6606 |
| External Side Centering Diameter | Ø 105 f7 |
| Pump-Side Centering Diameter | Ø 105 H7 |
| Radial Bearing | 3210 A |
| Retaining Rings (Seeger) | UNI 7435-50 (Quantity: 2) |
| Radial Shaft Seal | 40x52x7 mm |
| O-Ring Seal | OR 189 |
| Mounting Hole Center-to-Center Spacing | 102 mm x 145 mm (Ø 11 mm holes) |
| Housing Dimensions | 127 mm (W) x 172 mm (H) x 71 mm (housing depth) / 114.5 mm overall |
| Position | Product Code | Component Description | Quantity |
|---|---|---|---|
| – | 25407 | Complete Support for Bosch Group 3 Pumps (Series Assembly) | 1 |
| 1 | 801600 | UNI 8839-B 16 washer | 1 |
| 2 | 905000 | Seeger retaining ring UNI 7435-50 | 2 |
| 3 | 601615 | Standard M16x1.5 hexagonal nut | 1 |
| 4 | 401890 | O-ring OR 189 | 1 |
| 5 | 424751 | 4×7.5 Woodruff key UNI 6606 | 1 |
| 6 | 503210 | 3210 A bearing | 1 |
| 7 | 25007.18 | Housing | 1 |
| 8 | 304052 | 40x52x7 shaft seal | 1 |
| 9 | AC03/B50 | Shaft | 1 |
| 10 | 25007/C | Ring | 1 |