Borelli Group 4 Cast Iron Speed Increaser – 93000 Series
The Borelli Group 4 Cast Iron Speed Increaser – 93000 Series is designed to connect gear pumps to the power take-offs of agricultural tractors. Featuring a high-strength housing, UNI 16CrNi4 steel shafts and gears compliant with ISO/DIN 3990-80 standards with a low-profile tooth design, it ensures excellent mechanical strength and quiet operation. It supports output speeds of up to 3000 rpm and operating temperatures of up to 120°C.
The available product codes are: 93001, 93002, 93003 and an additional variant with a 3.7 ratio, for which no specific code is provided.
Speed increasers are primarily used to connect gear pumps to the power take-offs of agricultural tractors. The standard PTO output speed is 540 rpm, which the mechanical device increases to the appropriate and optimal operating speeds required by the connected hydraulic pumps. The system also supports input speeds other than the standard agricultural PTO speed, provided that the output speed of the speed increaser never exceeds the maximum safety limit of 3000 rpm. The torque ratings specified in the technical tables for individual speed increasers are calculated for continuous-duty operation. Under intermittent-duty conditions, the nominal torque ratings may be exceeded by up to 20%.
The Borelli Group 4 Cast Iron Speed Increaser – 93000 Series features housings manufactured from high-strength cast iron. The internal transmission system incorporates gears carefully designed in accordance with ISO/DIN 3990-80 standards. These gears are manufactured from high-quality UNI 18NiCrMo5 steel. The engineering design features corrected, low-profile gear teeth, providing the entire transmission mechanism with greater resistance to mechanical stress and exceptionally quiet operation. The transmission shafts are manufactured from special UNI 16CrNi4 steel and securely connected to the gears through splined sections, enabling them to withstand the torque loads specified in the catalogue with greater stability and reliability.
Proper lubrication management is essential for mechanical efficiency. The correct use of SAE 90 oil ensures reliable operation and maximizes the service life of the entire speed increaser assembly. The oil level must be visually inspected by a qualified technician through the dedicated transparent sight glass every 1500 operating hours. The maintenance procedure requires the first oil change to be performed after an initial running-in period of 60 to 80 operating hours. To preserve the integrity of the components and seals (such as the 50x65x8 oil seal), the continuous operating temperature of the lubricant and the device must never exceed 120°C.
Mounting hydraulic pumps onto the system always requires a coupling half and an adapter flange specifically suited to the application. The 93000 Series offers extensive compatibility, accommodating flanges for Group 2, Group 3, Group 3.5 and Group 4 pumps, including SAE A, SAE B, SAE C and Bosch standard connections. Power is transmitted through male or female 1″ 3/8 PTO shafts, supported and aligned by industrial-grade 6210 bearings. Given the wide range of possible configurations, it is essential to specify the exact flange type and pump shaft configuration when ordering to ensure proper mechanical coupling.
| Specification | Value |
|---|---|
| Housing Material | High-strength cast iron |
| Gear Material | UNI 18NiCrMo5 Steel |
| Gear Standards | ISO/DIN 3990-80 |
| Shaft Material | UNI 16CrNi4 Steel (Splined Coupling) |
| Maximum Output Speed | 3000 rpm |
| Continuous Operating Temperature | Up to 120°C |
| Lubricating Oil Specifications | SAE 90 Oil |
| First Oil Change | After 60-80 operating hours |
| Oil Inspection Interval | Every 1500 hours using the sight glass |
| PTO Shaft Type | Male or Female 1″ 3/8 |
| Model / Code | Ratio (N.1/N.2) | Input Speed (rpm) | Output Speed (rpm) | Torque M1 (daNm) | Torque M2 (daNm) | Power (kW) | Weight (kg) |
|---|---|---|---|---|---|---|---|
| 93001 | 2 | 540 | 1080 | 120 | 60 | 68 | 27 |
| 93002 | 2.5 | 540 | 1350 | 124 | 49.50 | 70 | 27 |
| 93003 | 3.2 | 540 | 1728 | 128 | 40 | 72 | 27 |
| 93000 Series (Ratio 3.7) | 3.7 | 540 | 1998 | 117 | 31.5 | 66 | 27 |