Borelli SAE A-B Cast Iron Speed Increaser – 97601 Series
The Borelli SAE A-B Cast Iron Speed Increaser – 97601 Series is designed to connect gear pumps to the power take-offs of agricultural tractors. Featuring a high-strength housing and UNI 18NiCrMo5 steel gears with a low-profile tooth design, it ensures exceptionally quiet operation and excellent mechanical strength. It supports continuous operating temperatures of up to 120°C and transmits 68 kW of power. SAE 90 oil lubrication is required. The available variants (classified by transmission ratio) are: Ratio 1:2, Ratio 1:2.5, Ratio 1:3, Ratio 1:3.5, Ratio 1:3.8.
The Borelli SAE A-B Cast Iron Speed Increaser – 97601 Series is a precision mechanical component used to connect gear pumps to the power take-offs of agricultural tractors. Since the standard PTO output speed is 540 rpm, this device increases that speed to the appropriate operating speeds required for the proper functioning of hydraulic pumps. The system also supports different input speeds, provided that the output speed of the speed increaser never exceeds the maximum limit of 3000 rpm. Mounting hydraulic pumps requires a coupling half and a specific adapter flange; therefore, it is essential to specify the flange type and the shaft configuration of the pump being used (e.g. SAE A-B) when placing an order.
The speed increaser is designed to ensure high operational reliability. The housings are manufactured from cast aluminium and cast iron, materials selected to provide excellent mechanical strength and resistance to structural stress. The internal gears are dimensioned in strict compliance with international ISO/DIN 3990-80 standards and manufactured entirely from UNI 18NiCrMo5 steel. To provide the transmission mechanism with greater resistance to mechanical stress and quieter operation during rotation, the gear teeth feature a corrected, low-profile design. The transmission shafts are manufactured from UNI 16CrNi4 steel and connected to the gears through splined profiles, a technical solution that significantly increases their ability to withstand maximum operating torque loads. The male power take-off shaft features a 1 3/8″ Z6 DIN 9611 profile.
The mechanical performance of the 97601 Series is optimized for industrial applications. The nominal torque ratings specified in the technical tables are calculated for continuous-duty operating conditions. Under intermittent-duty conditions, the torque ratings supported by the assembly may be exceeded by up to 20% compared to their nominal values. The series supports a constant power rating of 68 kW across all models and has a standard weight of 16 kg. The transmission ratios (N.1/N.2) range from 1:2 to 1:3.8, allowing output speeds (N.2) from 1080 rpm to 2057 rpm with an input speed of 540 rpm.
To ensure maximum service life and reliable operation of the Borelli SAE A-B Cast Iron Speed Increaser – 97601 Series, proper lubrication with SAE 90 oil is required. The oil level inside the housing, which has a maximum capacity of 1.50 litres, must be visually inspected through the dedicated sight glass every 1500 operating hours. It is also essential to perform the first oil change after an initial running-in period of 60 to 80 operating hours. Regarding thermal performance, the device is designed to withstand high loads, but the operating temperature during continuous duty must never exceed the specified maximum limit of 120°C.
| Specification | Value / Details |
|---|---|
| Input Speed (PTO) | 540 rpm |
| Maximum Permitted Output Speed | 3000 rpm |
| Housing Material | Cast aluminium and cast iron |
| Gear Material (ISO/DIN 3990-80 Standard) | UNI 18NiCrMo5 Steel (corrected, low-profile gear teeth) |
| Shaft Material | UNI 16CrNi4 Steel (splined coupling) |
| Permissible Overload for Intermittent Duty | +20% of nominal torque |
| Recommended Oil | SAE 90 |
| Maximum Oil Capacity | 1.50 litres |
| Oil Level Inspection | Visual inspection every 1500 hours |
| First Oil Change | After 60-80 operating hours |
| Maximum Continuous Operating Temperature | 120°C |
| Power Take-Off Shaft | Male 1 3/8″ Z6 DIN 9611 |
| Power | 68 kW |
| Weight (G) | 16 kg |
| Model (Transmission Ratio Variant) | Torque M1 (daNm) | Torque M2 (daNm) | Output Speed (rpm) |
|---|---|---|---|
| Ratio 1:2 | 98 | 49 | 1080 |
| Ratio 1:2.5 | 112.5 | 45 | 1408 |
| Ratio 1:3 | 132 | 44 | 1620 |
| Ratio 1:3.5 | 112.5 | 35 | 1836 |
| Ratio 1:3.8 | 110.2 | 29 | 2057 |