Borelli Support for Bosch Group 2 Pumps – 25408 Series
The Borelli Support for Bosch Group 2 Pumps – 25408 Series is a mechanical assembly designed for Bosch Group 2 hydraulic pumps, capable of withstanding radial loads of up to 98 daN and axial loads of 95 daN. It features a 3304 A double-row ball bearing, a shaft with a 1:5 taper ratio, a 20x40x7 shaft seal and a flanged housing with a 52 H8 mm centering diameter.
The available product and component codes are: 25408 (complete assembly), 25006.2, 601415, 801400, 302040, 902000, 503304, 700465, AC02/S.
The Borelli Support for Bosch Group 2 Pumps – 25408 Series is a support assembly designed for coupling Bosch Group 2 hydraulic pumps. It absorbs external stresses generated by pulley, gear or belt transmissions, preventing these loads from acting directly on the pump’s primary shaft. The assembly is housed within the housing component (code 25006.2), machined with a 52 mm centering shoulder featuring an H8 tolerance and a depth of 8 mm, combined with an external collar with a centering diameter of 80 f7.
The support incorporates a 3304 A bearing (code 503304), axially secured by a UNI 7435-20 Seeger retaining ring (code 902000). Internal protection and lubricant retention are provided by a radial shaft seal measuring 20x40x7 mm (code 302040). The connecting shaft (code AC02/S) features a standardized tapered end with a 1:5 taper ratio and a nominal base diameter of 20 mm.
The assembly ensures maximum mechanical reliability under demanding operating conditions, allowing external radial loads of up to 98 daN applied at the shaft end and an axial load capacity of 95 daN. The structural rigidity of the housing and the rotational precision of the 3304 A bearing help maintain transmission component alignment and protect the rotary seals of the connected hydraulic pump.
The support housing features a rectangular flange measuring 120 mm in height and 92 mm in width. The external mounting interface includes:
| Specification | Value |
|---|---|
| Product Series | 25408 |
| Pump Application | Bosch Group 2 |
| Permissible Radial Load | 98 daN |
| Permissible Axial Load | 95 daN |
| Installed Bearing | 3304 A (Code 503304) |
| Shaft Type | 1:5 tapered (Code AC02/S) |
| Shaft Base Diameter | Ø 20 mm |
| Shaft Key | 4×6.5 Woodruff key UNI 6606 (Code 700465) |
| Shaft End Thread | M14x1.5 with UNI 28675 nut and 14 mm diameter Grower spring lock washer |
| Radial Shaft Seal | 20x40x7 mm (Code 302040) |
| Retaining Ring | Seeger UNI 7435-20 (Code 902000) |
| Centering Diameters | Ø 52 H8 (8 mm depth) / Ø 80 f7 |
| External Flange Dimensions | 120 x 92 mm |
| External Mounting Holes | 4 holes Ø 9 mm with Ø 18 mm counterbores (72 x 100 mm center-to-center spacing) |
| Pump Mounting | 4 M10 threaded holes x 30 mm deep (60 x 60 mm center-to-center spacing) |
| Model / Component | Exploded View Position | Product Code | Technical Description / Standard | Quantity |
|---|---|---|---|---|
| Complete Support – 25408 Series | – | 25408 | Complete Support for Bosch Group 2 Pumps | 1 |
| Housing | 1 | 25006.2 | Support housing | 1 |
| Nut | 2 | 601415 | UNI 28675 M14x1.5 hexagonal nut | 1 |
| Washer | 3 | 801400 | Grower spring lock washer, dia. 14 mm | 1 |
| Shaft Seal | 4 | 302040 | 20x40x7 mm rotary shaft seal | 1 |
| Seeger Retaining Ring | 5 | 902000 | Circlip / Seeger UNI 7435-20 | 1 |
| Bearing | 6 | 503304 | 3304 A ball bearing | 1 |
| Key | 7 | 700465 | 4×6.5 Woodruff key UNI 6606 | 1 |
| Shaft | 8 | AC02/S | 1:5 tapered shaft for Bosch Group 2 pumps | 1 |