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Borelli Reinforced Support for Group 3 Pumps – 25404-4/25604-4 Series
The Borelli Reinforced Support for Group 3 Pumps – 25404-4/25604-4 Series ensures stability and strength in hydraulic systems. Equipped with a 3209A bearing, a tapered shaft (1:8) and a Z18 35×31 DIN 5482 splined connection, it provides reliable power transmission. The variants withstand loads of up to 315 daN (25404-4) and 240 daN (25604-4), offering maximum durability in demanding applications thanks to carefully optimized mechanical and sealing components.
The available product codes are: 25004/41, 303852, 904500, 428740, AC24/4, 503209, 403200, COP085, 404300, 601415, 801400, 700475, ACO3/4F, 25404-4, 25604-4.
Borelli Reinforced Support for Group 3 Pumps – 25404-4/25604-4 Series
The Borelli Reinforced Support for Group 3 Pumps – 25404-4/25604-4 Series is a high-performance mechanical solution for coupling and power transmission in hydraulic systems subject to demanding operating conditions. Specifically designed for Group 3 pumps, this support ensures effective absorption of radial and axial loads, protecting the integrity of the hydraulic pump and maximizing the service life of the entire system.
The central structure is built around a robust housing (code 25004/41) designed to withstand continuous operating cycles. The rotating assembly relies on a high-performance 3209A bearing (code 503209), secured in position by UNI 7435-45 Seeger retaining rings. This configuration ensures reduced friction and smooth rotation even under maximum load.
The transmission system is available with a tapered shaft (ACO3/4F) featuring a 1:8 taper ratio or a 24 mm diameter cylindrical shaft (AC24/4). Both shaft configurations use standardized key systems, including an 8x7x40 UNI 6604 parallel key and a 4×7.5 UNI 6606 Woodruff key, ensuring secure mechanical coupling without unwanted play. Final fastening is provided by a UNI 28675 M14x1.5 nut combined with a 14 mm diameter Grower spring lock washer (code 801400).
The series includes two main models that share the same basic design but offer different load specifications to meet various application requirements:
To ensure reliable operation in contaminated industrial environments or in the presence of hydraulic fluids, the Borelli Reinforced Support for Group 3 Pumps – 25404-4/25604-4 Series is equipped with a multi-component sealing system. The main assembly is protected by a 38x52x7 shaft seal (code 303852) installed at the shaft entry point. This component is complemented by an OR 3200 O-ring (code 403200) and an OR 4300 O-ring (code 404300), which, together with the 85 mm diameter ring (COP085), seal the bearing assembly, preventing lubricant leakage and the ingress of particulate contaminants.
The mounting interfaces comply with standard hole patterns and tolerances for Group 3 pumps. The support features mounting hole center-to-center distances of 120.4 mm and 98.4 mm, with a pump-side centering diameter of 50.8 mm (G7 tolerance). Strict compliance with UNI and DIN standards (such as DIN 5482 for spline profiles) ensures broad compatibility and easy integration into existing hydraulic power units.
| Specification | Value |
|---|---|
| Pump Group | Group 3 |
| Maximum Load – 25404-4 Model | 315 daN |
| Maximum Load – 25604-4 Model | 240 daN / 140 daN |
| Spline Profile (25604-4) | Z18 35×31 DIN 5482 |
| Shaft Taper Ratio (25404-4) | 1:8 (M14x1.5 thread) |
| Pump-Side Centering Diameter | 50.8 mm (G7 tolerance) |
| Mounting Hole Center-to-Center Spacing | 120.4 mm and 98.4 mm |
| Bearing | 3209A (Code 503209) |
| Cylindrical Shaft (AC24/4) | D=24 mm |
| Position | Product Code | Description | Quantity |
|---|---|---|---|
| – | 25404-4 | Reinforced Support for Group 3 Pumps – Tapered Shaft | 1 |
| – | 25604-4 | Reinforced Support for Group 3 Pumps – Splined Connection | 1 |
| 1 | 25004/41 | Housing | 1 |
| 2 | 303852 | 38x52x7 shaft seal | 1 |
| 3 | 904500 | Seeger retaining ring UNI 7435-45 | 2 |
| 4 | 428740 | 8x7x40 parallel key UNI 6604 | 1 |
| 5 | AC24/4 | Shaft, dia. 24 mm | 1 |
| 6 | 503209 | 3209A bearing | 1 |
| 7 | 403200 | O-ring OR 3200 | 1 |
| 8 | COP085 | Ring, dia. 85 mm | 1 |
| 9 | 404300 | O-ring OR 4300 | 1 |
| 10 | 601415 | UNI 28675 M14x1.5 nut | 1 |
| 11 | 801400 | Grower spring lock washer, dia. 14 mm | 1 |
| 12 | 700475 | 4×7.5 Woodruff key UNI 6606 | 1 |
| 13 | ACO3/4F | Tapered shaft | 1 |