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Borelli Cast Iron Support for Group 3 Pumps – 25610/24 Series
The Borelli Cast Iron Support for Group 3 Pumps – 25610/24 Series is designed to ensure rigid and reliable coupling of Group 3 hydraulic pumps. Featuring a cast iron housing with a 3209 A bearing, a 24 mm diameter cylindrical shaft (f6 tolerance) with an 8x7x40 key, a DIN 5482 35×31 splined hub, an MB grease nipple, and a sealing system with a 45x60x7 shaft seal and O-rings, it provides excellent resistance to radial loads. The available product and component codes are: 25610/24, 404300, 403200, 904500, 428740, 500000.1, 940182, 503209, 28000.1, COPO8S, 304560, AC24/G.
Borelli Cast Iron Support for Group 3 Pumps – 25610/24 Series
The Borelli Cast Iron Support for Group 3 Pumps – 25610/24 Series is a mechanical assembly specifically designed to house, center and protect the drive system of Group 3 hydraulic pumps. The supporting structure consists of a rigid cast iron housing (code 28000.1), which ensures dimensional stability and resistance to mechanical stresses during operation. The assembly operates through an AC24/G shaft with a cylindrical end measuring 24 mm in diameter (24f6 tolerance), equipped with a standardized 8x7x40 key (code 428740) for coupling with pulleys or external drive components.
Within the assembly, rotational motion is transmitted to the hydraulic pump through a toothed hub featuring a DIN 5482 35×31 spline profile. The shaft is guided and supported by a high-performance 3209 A bearing (code 503209), secured in position by 45 mm diameter retaining rings (code 904500). According to the specified load ratings, the mechanical configuration withstands radial loads of 395 daN, 290 daN and 170 daN at different support points along the shaft and housing, helping minimize shaft deflection and vibration affecting the pump’s primary shaft.
The integrity of the assembly and the service life of the bearing are supported by a combination of sealing and lubrication components:
The support features a front centering interface with diameter specifications of 50.75 H7 / 50.75 f6, four 11 mm diameter mounting holes (No. 4) arranged on a 98 x 128 mm bolt pattern, and overall flange dimensions of 129 mm x 158 mm. The side profile has an overall axial dimension of 114.5 mm, comprising a 60 mm shaft projection and a 54.5 mm flange housing section. The modular design allows straightforward installation and precise compatibility with standard Group 3 hydraulic gear pumps.
| Specification | Value |
|---|---|
| Product Series | 25610/24 (Borelli Oleodinamica) |
| Compatible Pump Group | Group 3 (Gr. 3) |
| Housing Material | Cast iron |
| Drive Shaft Type | Cylindrical, 24 mm diameter (24f6 tolerance) |
| Drive Key | 8x7x40 (DIN / standardized) |
| Internal Pump-Side Hub Profile | DIN 5482 35×31 splined hub |
| Bearing Type | 3209 A |
| Permissible Radial Loads | 395 daN – 290 daN – 170 daN |
| Radial Shaft Seal | 45x60x7 |
| O-Ring Seals | O-ring 404300 / O-ring 3200 |
| Lubrication Device | MB grease nipple |
| Drain/Vent Plug | M10x1 |
| Flange Centering Diameter | 50.75 H7 / 50.75 f6 diameter |
| Flange Mounting Holes | 4 holes, 11 mm diameter (98 x 128 mm center-to-center spacing) |
| Position | Product Code | Component Description | Quantity |
|---|---|---|---|
| Assembly | 25610/24 | Complete Cast Iron Support for Group 3 Pumps | – |
| 1 | 404300 | O-ring | 1 |
| 2 | 403200 | O-ring 3200 | 1 |
| 3 | 904500 | Retaining ring, dia. 45 mm | 2 |
| 4 | 428740 | 8x7x40 key | 1 |
| 5 | 500000.1 | MB grease nipple | 1 |
| 6 | 940182 | M10x1 plug | 1 |
| 7 | 503209 | 3209 A bearing | 1 |
| 8 | 28000.1 | Housing | 1 |
| 9 | COPO8S | Ring | 1 |
| 10 | 304560 | 45x60x7 shaft seal | 1 |
| 11 | AC24/G | Shaft, dia. 24 mm | 1 |