Borelli Support for Group 1 Pumps – 25401/25601 Series
The Borelli Support for Group 1 Pumps – 25401/25601 Series absorbs mechanical stresses, protecting Group 1 hydraulic pumps. Designed to withstand radial loads of up to 100 daN and axial loads of up to 90 daN, it incorporates a 3206A bearing, a dedicated housing and sealing components to ensure maximum operational reliability. It is available with an 18 mm diameter cylindrical shaft, a Z14 DIN 5482 spline profile or a 1:8 tapered shaft with an M12x1.5 thread.
The available product codes are: 25401 Series, 25601 Series (Spare parts: 25001.1, 303040, 903000, 426625, AC18.1, 503206, 402100, COP062, 403225, 601215, 801200, 700465, AC01).
The Borelli support for Group 1 hydraulic pumps is designed to isolate and absorb external forces generated by belt, chain or gear transmissions, preventing these stresses from acting on the hydraulic pump shaft and its internal bearings. According to the dimensional and load diagrams, the unit is designed to withstand radial loads of 100 daN and 75 daN at different points along the protruding shaft, as well as axial loads of up to 90 daN.
The assembly is built around a machined housing featuring a 25.4 H7 rear centering diameter and a 50.8 f7 front centering diameter, with mounting hole spacing of 72×53 mm (7 mm diameter holes) and overall housing dimensions of 93×75 mm. The internal assembly includes precision mechanical components:
The Borelli Group 1 range includes two series with different coupling geometries:
| Specification | Value |
|---|---|
| Compatible Pump Group | Group 1 |
| Reference Series | 25401 / 25601 |
| Maximum Permissible Radial Load | 75 daN to 100 daN |
| Maximum Permissible Axial Load | 90 daN |
| Installed Bearing Type | 3206A |
| 25601 Series Pump Connection | Z14 25×22 DIN 5482 spline profile |
| 25601 Series Cylindrical Shaft | 18 mm diameter (h7) with M6 thread and 6x6x25 UNI 6604 key |
| 25401 Series Pump Connection | 1:8 tapered shaft with M12x1.5 nut and 4×6.5 UNI 6606 Woodruff key |
| Flange Dimensions and Centering Diameters | 93 x 75 mm housing, 25.4 H7 and 50.8 f7 centering diameters |
| Flange Mounting Holes | 4 holes, 7 mm diameter (72 x 53 mm center-to-center spacing) |
| Internal and External Seals | 30x40x7 shaft seal, O-ring 2100, O-ring 3225 |
| Position | Product / Spare Part Code | Component Description | Quantity per Assembly |
|---|---|---|---|
| – | 25401 Series | Complete support assembly with 1:8 tapered shaft | 1 |
| – | 25601 Series | Complete support assembly with 18 mm diameter cylindrical shaft and DIN 5482 spline connection | 1 |
| 1 | 25001.1 | Housing | 1 |
| 2 | 303040 | 30x40x7 shaft seal | 1 |
| 3 | 903000 | Seeger retaining ring UNI 7435-30 | 2 |
| 4 | 426625 | 6x6x25 key UNI 6604 | 1 |
| 5 | AC18.1 | Shaft, dia. 18 mm | 1 |
| 6 | 503206 | 3206A bearing | 1 |
| 7 | 402100 | O-ring 2100 | 1 |
| 8 | COP062 | Ring, dia. 62 mm | 1 |
| 9 | 403225 | O-ring 3225 | 1 |
| 10 | 601215 | UNI 28675 M12x1.5 nut | 1 |
| 11 | 801200 | Grower spring lock washer, dia. 12 mm | 1 |
| 12 | 700465 | 4×6.5 Woodruff key UNI 6606 | 1 |
| 13 | ACO1 | Tapered shaft | 1 |