Borelli Group 2 Speed Increaser – 60000 Series
The Borelli Group 2 Speed Increaser – 60000 Series connects gear pumps to the power take-offs of agricultural tractors (540 rpm). Manufactured with a cast aluminium and cast iron housing, it features UNI 18NiCrMo5 steel gears designed in accordance with ISO/DIN 3990-80 standards for exceptionally quiet operation. It supports output speeds of up to 3000 rpm, SAE 90 oil lubrication and operating temperatures of up to 120°C, ensuring high mechanical strength during continuous operation. The available product codes are: 60001, 60002, 60003, 60004, 50100, 60100.
Speed increasers are primarily used to connect gear pumps to the power take-offs of agricultural tractors. Since the standard PTO output speed is 540 rpm, the Borelli Group 2 Speed Increaser – 60000 Series increases this speed to the optimal operating speeds required by hydraulic pumps. The unit is also compatible with other input speeds, provided that the output speed of the speed increaser never exceeds the maximum permitted limit of 3000 rpm.
The strength and reliability of the system are ensured by the use of high-quality materials. The speed increaser housings are manufactured from cast aluminium and cast iron, specifically selected to provide high mechanical strength throughout the assembly. The core transmission system consists of gears designed in strict compliance with ISO/DIN 3990-80 standards and manufactured from UNI 18NiCrMo5 steel. The gear teeth feature a corrected, low-profile design: this specific manufacturing process provides greater resistance to mechanical stress and significantly reduces operating noise. The shafts are manufactured from UNI 16CrNi4 steel and connected to the gears through splined couplings, making them suitable for withstanding the high torque loads transmitted by the system.
The torque ratings specified for this series of speed increasers are calculated for continuous-duty operation, with a standard power rating of 10 kW. However, the system provides an additional operating margin: under intermittent-duty conditions, the specified torque ratings may be exceeded by up to 20% compared to nominal values. To preserve the mechanical properties of the components and the characteristics of the lubricant, the operating temperature during continuous duty must never exceed 120°C. Various transmission ratios (from 1.5 to 3.8) are available to adjust the output speed according to the requirements of the hydraulic system.
Proper maintenance and lubrication are essential to ensure reliable operation and a long service life. The manufacturer requires the exclusive use of SAE 90 oil. The lubricant level, with a maximum oil capacity of 0.220 litres, must be visually checked through the dedicated sight glass every 1500 operating hours. The first oil change must also be performed after an initial running-in period of 60-80 operating hours.
Mounting hydraulic pumps onto the speed increaser always requires a coupling half and an adapter flange suitable for the specific application. When configuring and ordering the unit, it is essential to specify the flange type and the shaft configuration of the pump being used. The system supports standard flange configurations, including Group 2 BOSCH and SAE A Group 2.
| Specification | Value |
|---|---|
| Power Take-Off (PTO) Output Speed | 540 rpm |
| Maximum Speed Increaser Output Speed | 3000 rpm |
| Housing Material | Cast aluminium and high-strength cast iron |
| Gear Material | UNI 18NiCrMo5 Steel (ISO/DIN 3990-80 Standards) |
| Shaft Material | UNI 16CrNi4 Steel (Splined Coupling) |
| Lubricating Oil | SAE 90 |
| Maximum Oil Capacity | 0.220 litres |
| Maximum Operating Temperature | 120°C |
| Oil Inspection Interval | Every 1500 hours |
| First Oil Change | After 60 – 80 hours |
| Standard Power | 10 kW |
| Average Weight | 5.5 kg |
| Model / Code | Type / Description |
|---|---|
| 60001 | 1 3/8″ Male PTO Shaft |
| 60002 | Speed Increaser Housing / Body |
| 60003 | 1 3/8″ Long Female PTO Shaft |
| 60004 | 1 3/8″ Short Female PTO Shaft |
| 50100 | Group 2 BOSCH Adapter Flange |
| 60100 | SAE A Group 2 Adapter Flange |