Borelli Group 3 SAE Speed Reducer – 96070 Series
The Borelli Group 3 SAE Speed Reducer – 96070 Series is designed to connect hydraulic motors used in agricultural machinery, earthmoving equipment and marine applications. Manufactured with an aluminium and cast iron housing, it ensures high mechanical strength and reliable operation at temperatures of up to 120°C. Equipped with UNI 18NiCrMo5 steel gears, it delivers a power rating of 20 kW and supports a maximum input speed of 3000 rpm.
The available product codes (flange/spline configuration variants) are: 96071, 96072, 96074, 96075.
Speed reducers are used to connect hydraulic motors in self-propelled agricultural machinery, earthmoving equipment and marine applications. Hydraulic motors can be mounted onto the speed reducers using either a cylindrical shaft requiring a keyed connection or a splined shaft compliant with DIN or SAE standards for direct coupling.
The output speed of the speed reducers is fixed at 200 rpm, allowing the operating speed of hydraulic motors to be adjusted appropriately, provided that the input speed does not exceed the maximum limit of 3000 rpm. The torque ratings specified in the technical data are calculated for continuous-duty operation. When the speed reducer operates under intermittent-duty conditions, the nominal torque ratings may be exceeded by up to 20%. All models in the series offer a standard power rating of 20 kW and have a total weight of 8.4 kg. The transmission ratios range from 1.5 to 3.8, accommodating different torque and input speed requirements.
The speed reducer housings are manufactured from high-strength aluminium and cast iron to withstand demanding operating loads. The gears are carefully designed in compliance with ISO/DIN 3990-80 standards and manufactured from UNI 18NiCrMo5 steel. The gear teeth feature corrected and shaved profiles to minimize friction. The shafts, manufactured from robust 16CrNi4 steel, are connected to the gears using dedicated mechanical keys. The internal assembly incorporates 6009 and 6010 bearings, oil seals (45x65x8 and 50x65x8) and SAE A mounting flanges.
To ensure proper operation and extend the service life of the assembly, SAE 90 oil must be used. The maximum lubricant capacity of the speed reducer is 0.350 litres. The oil level must be visually inspected through the dedicated sight glass every 2000 operating hours. The first oil change is mandatory and must be performed after the initial 100-150 hours of operation. Regarding thermal performance, the continuous operating temperature of the lubricant and the system must never exceed 120°C. The unit is also equipped with 3/8″ oil drain, level and breather plugs to facilitate maintenance.
| Specification | Value |
|---|---|
| Output Speed (rpm) | 200 |
| Maximum Input Speed (rpm) | 3000 |
| Housing Material | Aluminium and cast iron |
| Gear Material | UNI 18NiCrMo5 Steel |
| Shaft Material | 16CrNi4 Steel |
| Lubricating Oil Type | SAE 90 |
| Maximum Oil Capacity (litres) | 0.350 |
| Maximum Continuous Operating Temperature | 120°C |
| Power (kW) | 20 |
| Total Weight (kg) | 8.4 |
| Model (Code) | Description / Connection Type |
|---|---|
| 96071 | 25 H7 Cylindrical Shaft with Key |
| 96072 | SAE 6B Splined Profile |
| 96074 | DIN 5482-B 35×31 Splined Profile |
| 96075 | Ø101.6 Bore with M14 Fastening |