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Borelli Cast Iron ISO Through-Shaft Speed Increaser – 72000 Series
The Borelli Cast Iron ISO Through-Shaft Speed Increaser – 72000 Series is designed to connect gear pumps to the power take-offs of agricultural tractors. Manufactured from high-strength cast iron, it features UNI 18NiCrMo5 steel gears with a low-profile tooth design for quieter operation and greater mechanical strength. It supports output speeds of up to 3000 rpm and continuous operating temperatures of up to 120°C. SAE 90 oil lubrication is required. The available product codes are: 72005, 72006, 72007, 72008, 72009, 72011. All product codes specific to this series listed in the document have been included.
Borelli Cast Iron ISO Through-Shaft Speed Increaser – 72000 Series
The Borelli Cast Iron ISO Through-Shaft Speed Increaser – 72000 Series is an essential mechanical component used to connect gear pumps to the power take-offs of agricultural tractors[cite: 1, 2]. Since the standard PTO output speed is 540 rpm, this speed increaser adjusts that speed to the optimal operating speeds required by hydraulic pumps[cite: 2]. The system is also designed to accommodate different input speeds, provided that the final output speed of the speed increaser never exceeds the maximum limit of 3000 rpm[cite: 2].
The structural reliability of the Borelli Cast Iron ISO Through-Shaft Speed Increaser – 72000 Series is ensured by the quality of the materials used[cite: 1, 2]. The housings are manufactured from high-strength cast iron, providing strength and durability even under demanding operating conditions[cite: 2]. The internal gears are designed in strict compliance with international ISO/DIN 3990-80 standards and manufactured from special UNI 18NiCrMo5 steel[cite: 2]. The gear teeth feature a corrected, low-profile design: this specific geometry provides the entire transmission mechanism with both greater load resistance and exceptionally quiet operation[cite: 2]. The shafts, which are essential for power transmission, are manufactured from UNI 16CrNi4 steel and connected to the gears through splined profiles[cite: 2]. This engineering solution enables them to withstand the high operating torque loads specified in the catalogue[cite: 2].
The device is designed to handle demanding operating loads[cite: 2]. The nominal torque ratings specified for these speed increasers refer to continuous-duty operating conditions[cite: 2]. However, under intermittent-duty conditions, the mechanical structure can withstand torque loads exceeding the nominal ratings by up to 20%[cite: 2]. Regarding operating temperatures, the system is designed to maintain efficiency provided that the temperature during continuous operation never exceeds the maximum limit of 120°C[cite: 2].
To ensure proper operation and extend the service life of the Borelli Cast Iron ISO Through-Shaft Speed Increaser – 72000 Series, oil-bath lubrication is required[cite: 2]. The correct use of SAE 90 oil is recommended[cite: 2]. The lubricant level, with a maximum oil capacity of 0.350 litres, must be visually checked through the dedicated transparent sight glass every 1500 operating hours[cite: 2, 4]. The first oil change is essential to remove any residues generated during the running-in period and must be performed after the initial 60-80 hours of operation[cite: 2].
Installing and mounting hydraulic pumps onto the speed increaser requires a coupling half and an adapter flange specifically suited to the application[cite: 2]. Therefore, it is necessary to specify the exact flange type and the shaft configuration of the pump being used[cite: 2].
| Specification | Value |
|---|---|
| Housing Material | High-strength cast iron |
| Gear Material | UNI 18NiCrMo5 Steel (ISO/DIN 3990-80 Standards) |
| Shaft Material | UNI 16CrNi4 Steel |
| Power Take-Off Input Speed | 540 rpm |
| Maximum Output Speed | 3000 rpm |
| Gear Tooth Profile | Corrected, low-profile teeth |
| Torque Overload Allowance (Intermittent Duty) | +20% |
| Lubricating Oil Type | SAE 90 |
| Maximum Oil Capacity | 0.350 litres |
| Oil Level Inspection | Every 1500 hours |
| First Oil Change | After 60-80 hours |
| Maximum Operating Temperature | 120°C |
| Standard Power (kW) | 37 kW |
| Weight (kg) | 15.5 kg |
| Model / Product Code | Ratio (N.1/N.2) | Output Speed (N.2) | Torque M2 (daNm) |
|---|---|---|---|
| 72005 | 1 | 540 | 31 |
| 72006 | 1.5 | 810 | 26 |
| 72007 | 2 | 1080 | 21 |
| 72008 | 2.5 | 1408 | 18 |
| 72009 | 3 | 1620 | 16 |
| 72011 | 3.5 and 3.8 (table variants) | 1836 / 2057 | 13 / 11.5 |