Description
Construction Features
The Borelli Reinforced Support for Group 2 Pumps – 25403.1/25603.1 Series is an essential component for power transmission in hydraulic systems. Built around a high-strength housing (code 25003/508.1), the support ensures precise alignment and stability of the pump shaft during operation. The rotating assembly relies on a high-performance 3208A bearing (code 503208), secured in position by two UNI 7435-40 Seeger retaining rings and a dedicated 80 mm diameter ring. Hydraulic and mechanical sealing is ensured by a 30x40x7 shaft seal and a combination of O-rings (OR 3143 and OR 174), which effectively prevent fluid leakage and the ingress of external contaminants.
Configurations and Load Capacity
The support range is divided into two main configurations to meet different mechanical coupling requirements in hydraulic pump assemblies. The 25403.1 Series is equipped with a tapered shaft (code AC02/R) featuring a 1:8 taper ratio, securely fastened with a UNI 28675 M12x1.5 nut, a 12 mm diameter Grower spring lock washer and a 3.2×6.5 UNI 6606 Woodruff key. This configuration provides resistance to radial loads of up to 285 daN and axial loads of up to 220 daN.
The 25603.1 variant, on the other hand, features a 22 mm diameter cylindrical shaft (code AC22/R) with an h7 tolerance, or alternatively, configurations with a Z15 28×25 spline profile compliant with DIN 5482. In these specific versions, the maximum permissible rated load capacity is 130 daN.
Internal Components and Standardization
All components of the Borelli Reinforced Support for Group 2 Pumps – 25403.1/25603.1 Series comply with strict dimensional standards. The coupling keys conform to UNI 6604 (6x6x40) and UNI 6606 standards, while threaded fastening components comply with UNI 28675. This high level of standardization significantly simplifies maintenance and replacement operations, ensuring full compatibility of spare parts, including the 25003/508.1 housing and the various seals and Seeger retaining rings, within Borelli hydraulic assemblies.
Coupling Dimensions and Specifications
The geometry of the supports is carefully designed to ensure optimal mechanical coupling. The 25403.1 model features an axial insertion dimension of 41.5 mm and precise centering diameters, including a 36.5 h7 reference diameter and a 50.8 mm flange diameter. The 25603.1 variant differs in its specific construction dimensions, featuring axial lengths of 89.4 mm and 57.5 mm, a 22 h7 shaft diameter and a 71.4 mm flange centering dimension. These dimensional parameters are essential for calculating installation space requirements during the design phase and ensuring alignment with the primary drive motor.
Technical Summary Table of the Main Specifications of the Borelli Reinforced Support for Group 2 Pumps – 25403.1/25603.1 Series
| Specification | Value |
|---|---|
| Application | Reinforced Support for Group 2 Pumps (Hydraulic Systems) |
| Housing | Code 25003/508.1 |
| Bearing | 3208A (Code 503208) |
| Shaft (25403.1 Version) | 1:8 tapered |
| Shaft (25603.1 Version) | Cylindrical, 22 h7 diameter / Z15 28×25 DIN 5482 splined |
| Load Capacity (25403.1) | 285 daN / 220 daN |
| Load Capacity (25603.1) | 130 daN |
| Sealing System | 30x40x7 shaft seal, O-ring 3143, O-ring 174 |
| Key Standards | UNI 6604, UNI 6606 |
| Fastening Standard | UNI 28675 M12x1.5 |
Product Codes
| Position | Code | Component Description | Quantity |
|---|---|---|---|
| Assembly | 25403.1 | Reinforced Support for Group 2 Pumps – Tapered Shaft | – |
| Assembly | 25603.1 | Reinforced Support for Group 2 Pumps – 22 mm Diameter / Splined Shaft | – |
| 1 | 25003/508.1 | 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 | Shaft, dia. 22 mm | 1 |
| 6 | 503208 | 3208A bearing | 1 |
| 7 | 403143 | O-ring 3143 | 1 |
| 8 | 25003/C1 | Ring, dia. 80 mm | 1 |
| 9 | 401740 | O-ring 174 | 1 |
| 10 | 601215 | UNI 28675 M12x1.5 nut | 1 |
| 11 | 801200 | Grower spring lock washer, dia. 12 mm | 1 |
| 12 | 700365 | 3.2×6.5 Woodruff key UNI 6606 | 1 |
| 13 | AC02/R | Tapered shaft | 1 |