Borelli Group 2-3 Pump Speed Increaser – 85000 Series
The Borelli Group 2-3 Pump Speed Increaser – 85000 Series connects gear pumps to agricultural tractor power take-offs (540 rpm). Featuring a cast aluminium and high-strength cast iron housing, it incorporates gears made of UNI 18NiCrMo5 steel (ISO/DIN 3990-80). It supports output speeds of up to 3000 rpm, a power capacity of 35 kW and continuous operating temperatures of up to 120°C, ensuring mechanical reliability. The available product codes for this family are: 85001, 85002, 85003, 85004, 85005, 96100, 96101.
The Borelli Group 2-3 Pump Speed Increaser – 85000 Series (also known as a speed-increasing gearbox) is a mechanical component specifically designed to connect gear pumps to the power take-offs (PTOs) of agricultural tractors. Since the standard output speed of tractor PTOs is 540 rpm, the speed increaser adjusts this speed to the appropriate operating speeds required for the correct functioning of hydraulic pumps. The system is also compatible with other input speeds, provided that the output speed of the speed increaser never exceeds 3000 rpm.
The structural reliability of the assembly is ensured by the use of high-quality materials. The external housings are made of cast aluminium and high-strength cast iron. The core transmission components consist of gears designed in strict accordance with ISO/DIN 3990-80 standards and manufactured from special UNI 18NiCrMo5 steel. To increase mechanical strength and ensure quiet operation, the gears feature corrected, low-profile teeth. The transmission shafts are manufactured from UNI 16CrNi4 steel and are connected to the gears through splined couplings, a technical solution designed to safely withstand the expected peak torque loads.
The operating specifications indicate a supported power capacity of 35 kW and a structural weight of 14 kg. The torque ratings specified for individual speed increasers are calculated for continuous-duty operating conditions. Under intermittent-duty conditions, the torque limits may be exceeded by a margin of 20%. During continuous operation, the operating temperature must remain below the maximum threshold of 120°C to preserve the seals and lubricant properties. The available speed multiplication ratios range from 1 to a maximum of 3.8, covering a wide range of hydraulic application requirements.
To ensure proper operation, smooth gear performance and maximum service life of the assembly, SAE 90 lubricating oil must be used. The lubricant level, with a maximum capacity of 1.30 litres, must be visually checked through the dedicated transparent sight glass every 1500 operating hours. The first oil change is essential for the proper running-in of the mechanical components and must be performed after the first 60 to 80 hours of actual operation.
Mounting hydraulic pumps onto the speed increaser requires a coupling half and a specific adapter flange. The series offers flange options compatible with SAE A Group 3 (Model 96100) and SAE B Group 3 (Model 96101) standards. The exploded spare parts diagram highlights the use of high-precision bearings (types 6010, 6009 and 6210), reinforced oil seals and various PTO shaft configurations (male, female with quick coupling, short or long female 1″ 3/8 Z6), ensuring maximum adaptability of the speed increaser to agricultural equipment.
Technical Summary Table of the Main Specifications of the Borelli Group 2-3 Pump Speed Increaser – 85000 Series
| Specification | Value |
|---|---|
| Power Take-Off Input Speed (Standard) | 540 rpm |
| Maximum Permitted Output Speed | 3000 rpm |
| Total Supported Power | 35 kW |
| Total Weight (G) | 14 kg |
| Available Speed Multiplication Ratios (N.1/N.2) | 1 / 1.5 / 2 / 2.5 / 3 / 3.5 / 3.8 |
| External Housing Material | Cast aluminium and high-strength cast iron |
| Gear Material and Standards | UNI 18NiCrMo5 Steel (ISO/DIN 3990-80 Standards) |
| Shaft Material | UNI 16CrNi4 Steel (Splined Coupling) |
| Overload Allowance (Intermittent Duty) | +20% of nominal torque |
| Maximum Continuous Operating Temperature | 120°C |
| Required Lubricant Type | SAE 90 Oil |
| Maximum Oil Capacity | 1.30 litres |
| Periodic Oil Level Inspection | Every 1500 operating hours using the dedicated sight glass |
| Initial Oil Change | After 60 to 80 operating hours |
| Model Code | Connection / Shaft / Flange Type |
|---|---|
| 85001 | A SAE 1″ 3/8 DIN 9611A / A SAE 1″ 3/4 DIN 9611 |
| 85002 | A SAE 1″ 3/8 DIN 9611 |
| 85003 | 1″ 3/8 Connection |
| 85004 | Z21 16/32 DP |
| 85005 | 48×44 DIN 5482 |
| 96100 | SAE A Group 3 Flange (Values G=10, H=24) |
| 96101 | SAE B Group 3 Flange (Values G=12, H=16) |