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Borelli Reinforced Support for Group 2 Pumps – 25403/25603 Series
The Borelli Reinforced Support for Group 2 Pumps – 25403/25603 Series is designed to ensure maximum stability in complex hydraulic systems. Equipped with a robust structural housing and two 6207A bearings, it effectively absorbs loads of up to 285 daN. The variants offer precision coupling with either a tapered shaft (1:8) or a splined shaft (DIN 5482), preventing misalignment and mechanical wear. The available product codes (series and components) are: 25403, 25603, 25003.1, 303040, 506207, 903500, 426640, AC22/R2, 403143, 25002/C1, 403262, 601215, 801200, 700465, ACO2/R2.
Borelli Reinforced Support for Group 2 Pumps – 25403/25603 Series
The Borelli Reinforced Support for Group 2 Pumps – 25403/25603 Series is an essential mechanical component for coupling and stabilizing Group 2 hydraulic pumps. The unit is designed to effectively absorb axial and radial stresses, protecting the pump shaft against excessive loads that could compromise its service life. The structure is built around a robust cast housing (component code 25003.1), featuring rectangular flanges measuring 114 mm by 89.4 mm. Mounting is achieved through four through-holes with center-to-center spacing of 96 mm and 71.4 mm, ensuring rigid, vibration-free installation on stationary and mobile machinery frames.
The reliability of the Borelli Reinforced Support for Group 2 Pumps – 25403/25603 Series is based on its internal rotating assembly. The system incorporates two 6207A ball bearings (code 506207), securely held in position by Seeger retaining rings compliant with UNI 7435-35. This configuration enables the support to withstand demanding dynamic forces, with specified load capacities of 130 daN, 220 daN and a maximum of 285 daN, depending on the direction of the applied force. To prevent fluid leakage and protect the moving components against external contamination, the unit incorporates a primary 30x40x7 mm shaft seal, supported by precision O-rings (OR 3143 and OR 3262) fitted in conjunction with a 72 mm diameter spacer ring.
The series includes two main coupling configurations, developed to meet specific mechanical transmission requirements. The first variant, identified as model 25403, features a tapered shaft (code ACO2/R2) with a 1:8 taper ratio. This version includes an M12x1.5 threaded end (secured with a UNI 28675 nut and a 12 mm diameter Grower spring lock washer) and uses a 3.2×6.5 key compliant with UNI 6606. The second variant, model 25603, features a female splined shaft (Z15 28×25 profile) compliant with DIN 5482 specifications, combined with a 22 mm diameter output shaft with h7 tolerance. This configuration uses a 6x6x40 UNI 6604 drive key, making it suitable for quick coupling and high-torque power transmission without slippage.
| Specification | Value |
|---|---|
| Application | Group 2 Hydraulic Pumps |
| Flange Dimensions (Height x Width) | 114 mm x 89.4 mm |
| Mounting Hole Center-to-Center Spacing | 96 mm / 71.4 mm |
| Permissible Loads (daN) | 130 daN / 220 daN / 285 daN |
| 25403 Model Coupling | 1:8 Tapered Shaft (M12x1.5 Thread) |
| 25603 Model Coupling | Z15 28×25 DIN 5482 Female Splined Shaft |
| 25603 Model Shaft Diameter | 22 mm (h7 Tolerance) |
| Housing Internal Diameter | 36.5 mm (H7 Tolerance) |
| Bearing Type | 2x 6207A Ball Bearings |
| Shaft Seal | 30x40x7 mm |
| Model / Code | Component Name / Description | Quantity per Assembly |
|---|---|---|
| 25403 | Complete Reinforced Support – Tapered Shaft Version | 1 |
| 25603 | Complete Reinforced Support – DIN 5482 Splined Shaft Version | 1 |
| 25003.1 | Housing | 1 |
| 303040 | 30x40x7 Shaft Seal | 1 |
| 506207 | 6207A Bearing | 2 |
| 903500 | Seeger Retaining Ring UNI 7435-35 | 2 |
| 426640 | 6x6x40 Key UNI 6604 | 1 |
| AC22/R2 | Shaft, Dia. 22 mm (Female d=22) | 1 |
| 403143 | O-Ring 3143 | 1 |
| 25002/C1 | Ring, Dia. 72 mm | 1 |
| 403262 | O-Ring 3262 | 1 |
| 601215 | UNI 28675 M12x1.5 Nut | 1 |
| 801200 | Grower Spring Lock Washer, Dia. 12 mm | 1 |
| 700465 | 3.2×6.5 Woodruff Key UNI 6606 | 1 |
| ACO2/R2 | Tapered Shaft | 1 |