Borelli Group 3.5 Speed Increaser – 80000 Series
The Borelli Group 3.5 Speed Increaser – 80000 Series is designed to connect gear pumps to the power take-offs (PTOs) of agricultural tractors. Manufactured with cast aluminium and high-strength cast iron housings, it features UNI 18NiCrMo5 steel gears with a low-profile tooth design to maximize efficiency and reduce operating noise. It supports a continuous power rating of 36 kW and allows torque increases of up to 20% under intermittent-duty conditions.
The available product codes (referring to the input shafts) are: 80001, 80002, 80003, 80004, 80005.
The Borelli Group 3.5 Speed Increaser – 80000 Series is used to connect gear pumps directly to the power take-offs of agricultural tractors. Since the standard PTO output speed is 540 rpm, this speed increaser adjusts that speed to the optimal operating speeds required by hydraulic pumps. Different input speeds may be used, provided that the output speed of the speed increaser does not exceed the maximum limit of 3000 rpm. Mounting the hydraulic pump requires a coupling half and a specific adapter flange.
The design prioritizes strength and long-term durability in demanding operating environments. The housings are manufactured from cast aluminium and high-strength cast iron. The core transmission system consists of gears designed in accordance with ISO/DIN 3990-80 standards and manufactured from UNI 18NiCrMo5 steel. The specially corrected, low-profile gear teeth provide not only greater resistance to mechanical stress but also exceptionally quiet operation. The shafts, manufactured from UNI 16CrNi4 steel, are connected to the gears through robust splined profiles, optimized to withstand the torque ratings specified in the catalogue for continuous-duty operation. Under intermittent-duty conditions, these torque ratings may be exceeded by up to 20%.
To ensure maximum service life and reliability of the transmission assembly, SAE 90 oil must be used, with a maximum oil capacity of 1.00 litre. Routine maintenance requires visual inspection of the lubricant level through the dedicated sight glass every 1500 operating hours. The first mandatory oil change must be performed after the initial 60 to 80 hours of operation. During continuous operation, the system’s operating temperature must never exceed the maximum limit of 120°C.
| Specification | Value |
|---|---|
| Group | Group 3.5 |
| Power | 36 kW |
| Standard Input Speed (N.1) | 540 rpm |
| Maximum Permitted Output Speed | 3000 rpm |
| Available Transmission Ratios (N.1/N.2) | 1 / 1.5 / 2 / 2.5 / 3 / 3.5 / 3.8 / 4 / 4.8 |
| Weight (G) | 13.5 kg |
| Housing Material | Cast aluminium and cast iron |
| Gear Material | UNI 18NiCrMo5 Steel (ISO/DIN 3990-80 Standards) |
| Shaft Material | UNI 16CrNi4 Steel |
| Oil Type and Capacity | SAE 90 / Max. 1.00 litre |
| Maximum Operating Temperature | 120 °C |
| Product Code (Input Shaft) | Connection Profile | Standard |
|---|---|---|
| 80001 | ASAE 1 3/8 | DIN 9611 A |
| 80002 | ASAE 1 3/8 | DIN 9611 Z 21 32 DP |
| 80003 | ASAE 3/4 | DIN 9611 A |
| 80004 | 40×36 | DIN 5482 |
| 80005 | 48×44 | DIN 5482 |