Borelli Support for Group 2 Pumps - 25402/25602 Series

Description

The Borelli Support for Group 2 Pumps – 25402/25602 Series is a rigid mechanical assembly developed to accommodate and support Group 2 hydraulic pumps, absorbing radial and axial stresses generated by upstream transmission components.

Construction Features and Mechanical Components

The assembly is built around a robust housing (code 25002/364.1), machined with a 36.5 H7 centering diameter (5 mm depth and 71.4 mm mounting hole spacing with M6 holes) and a 36.5 f7 shaft-side centering shoulder. The internal rotating assembly is supported by two 6207A ball bearings (code 506207), axially secured by two UNI 7435-35 Seeger retaining rings (code 903500) and a spacer ring with a diameter of 72 mm (code 25002/C1).

Hydraulic sealing and protection against external contaminants are provided by a 22x32x7 radial shaft seal (code 302232), supported by two dedicated O-ring seals: OR 3143 (code 403143) and OR 3262 (code 403262). The primary coupling incorporates an 18 mm diameter female shaft (code AC18.2), equipped with a 6x6x30 UNI 6604 key (code 426630).

Shaft Configuration Variants: 25402 Series and 25602 Series

The series includes two distinct drive shaft configurations to meet different mechanical coupling requirements:

25402 Model: equipped with an AC02 tapered shaft featuring a 1:8 taper ratio, an M12x1.5 threaded end, a UNI 28675 M12x1.5 nut (code 601215), a 12 mm diameter Grower spring lock washer (code 801200), a 3.2×6.5 UNI 6606 Woodruff keyway (code 700465) and an additional 4×6.5 UNI 6606 keyway. The shaft end has a length of 40 mm (30 mm usable tapered section) with a shoulder projection of 60.5 mm.
25602 Model: equipped with a Z14 25×22 DIN 5482 spline profile, an 18 h7 shaft diameter, a shaft end length of 54.5 mm and a shoulder projection of 60.5 mm.

Radial Load Capacity and Mechanical Specifications

The supports are tested to withstand high radial loads applied to the shaft end:

For the 25402 model, the permissible load capacity is 170 daN at the midpoint of the tapered shaft and 130 daN at the outer shaft end.
For the 25602 model, the permissible load capacity is 110 daN along the Z14 DIN 5482 splined section.

Technical Summary Table of the Main Specifications of the Borelli Support for Group 2 Pumps – 25402/25602 Series

Specification	Value
Compatible Pump Group	Group 2
Support Housing	Code 25002/364.1
Pump Flange Centering Diameter	36.5 H7 diameter (5 mm depth, M6 mounting holes with 71.4 mm center-to-center spacing)
Support Flange Centering Diameter	36.5 f7 diameter
Rolling Bearings	2x 6207A bearings (code 506207)
Retaining Rings	2x Seeger retaining rings UNI 7435-35 (code 903500)
Spacer Ring	Dia. 72 mm (code 25002/C1)
Primary Seal	22x32x7 shaft seal (code 302232)
Static Seals	1x O-ring OR 3143 (code 403143) + 1x O-ring OR 3262 (code 403262)
Internal Female Shaft	AC18.2 (D=18 mm) with 6x6x30 UNI 6604 key (code 426630)
25402 Shaft Configuration	1:8 tapered, M12x1.5 thread, UNI 28675 nut, Grower washer dia. 12 mm, 3.2×6.5 / 4×6.5 UNI 6606 Woodruff key
25602 Shaft Configuration	Z14 25×22 DIN 5482 splined shaft, 18 h7 shaft diameter
Permissible Radial Loads (25402)	170 daN (midpoint of tapered section) / 130 daN (shaft end)
Permissible Radial Load (25602)	110 daN (splined section)

Product Codes

Model	Shaft Type	Connection / Mechanical Specifications	Maximum Radial Load
25402	Tapered shaft (AC02)	1:8 taper ratio, M12x1.5 thread, 3.2×6.5 / 4×6.5 UNI 6606 Woodruff key	170 daN / 130 daN
25602	Splined shaft	Z14 25×22 DIN 5482 profile, 18 h7 shaft diameter	110 daN

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List of Manufacturers Brands

OLEODINAMICA BORELLI

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Borelli Support for Group 2 Pumps – 25402/25602 Series

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