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Borelli Support for Bosch Group 2 Pumps – 25406/25606 Series
The Borelli Support for Bosch Group 2 Pumps – 25406/25606 Series is a rigid mechanical assembly designed to isolate the shafts of Bosch Group 2 positive displacement pumps from demanding radial and axial loads. Equipped with a 3208A rolling bearing and a 30x40x7 shaft seal, it provides a radial load capacity of up to 146 daN and an axial load capacity of up to 190 daN. It is available with either a 1:5 tapered shaft or a cylindrical shaft with a keyway. The available product and component codes are: 25406 Series, 25606 Series, 250061, 303040, 904000, 426640, AC22/R, 503208, COPD88, 418025, ACO2/B, 700465, 801400, 601415.
Borelli Support for Bosch Group 2 Pumps – 25406/25606 Series
The Borelli 25406 and 25606 Series hydraulic pump supports provide a precise mounting interface for Bosch Group 2 hydraulic pumps (80 H7 mm centering diameter). The metal housing (code 250061) accommodates a reinforced shaft assembly supported by a 3208A double-row ball bearing. The sealing system includes a 30x40x7 mm radial shaft seal mounted on the shaft and two 80×2.5 O-rings positioned at the flange mounting interface. The internal mechanical assembly is secured by standardized UNI 7435-40 Seeger retaining rings and a shaped COPD88 ring.
The range is divided into two main variants according to the connecting shaft profile:
The mechanical dimensions include a housing body measuring 102 mm in width and 127 mm in overall height (50 mm above and 77 mm below the central shaft axis). The mounting flange features a standardized bolt pattern measuring 72 mm horizontally and 100 mm vertically, with 9 mm diameter slots or mounting holes. The internal splined interface for pump connection features an A32x28 profile compliant with DIN 5482 standards.
| Specification | Value |
|---|---|
| Compatible Pump Group | Bosch Group 2 |
| Housing Centering Diameter | Ø 80 H7 mm |
| Flange Mounting Hole Spacing | 72 mm x 100 mm (Ø 9 mm holes) |
| Housing Dimensions (W x H) | 102 mm x 127 mm |
| Support Bearing Type | 3208A |
| Front Shaft Seal | 30x40x7 mm |
| Coupling O-Ring Seal | O-ring 80×2.5 |
| Internal Spline Profile (Pump Side) | A 32 x 28 DIN 5482 |
| 25406 Series Shaft Configuration | 1:5 tapered, M14x1.5 thread, 4×6.5×16 UNI 6606 Woodruff key |
| 25406 Series Permissible Load | Radial: 146 daN – Axial: 190 daN |
| 25606 Series Shaft Configuration | Cylindrical Ø 22 H7 mm, M6 end thread, 6x6x40 UNI 6604 parallel key |
| 25606 Series Permissible Load | Radial: 130 daN |
| Position | Product Code | Component Description | Quantity per Assembly |
|---|---|---|---|
| Assembly | 25406 | Complete support with tapered shaft (1:5 taper ratio) | – |
| Assembly | 25606 | Complete support with cylindrical shaft (Ø 22 H7) | – |
| 1 | 250061 | Housing | 1 |
| 2 | 303040 | 30x40x7 shaft seal | 1 |
| 3 | 904000 | Seeger retaining ring UNI 7435-40 | 2 |
| 4 | 426640 | 6x6x40 key UNI 6604 | 1 |
| 5 | AC22/R | Cylindrical shaft, dia. 22 mm | 1 |
| 6 | 503208 | 3208A bearing | 1 |
| 7 | COPD88 | Ring, dia. 88 mm | 1 |
| 8 | 418025 | O-ring 80×2.5 | 2 |
| 9 | ACO2/B | Tapered shaft (1:5) | 1 |
| 10 | 700465 | 4×6.5×16 Woodruff key UNI 6606 | 1 |
| 11 | 801400 | Grower spring lock washer, dia. 14 mm | 1 |
| 12 | 601415 | UNI 28675 M14x1.5 nut | 1 |