OSPB hydraulic steering units
OSPB steering units are available with a wide range of capabilities including displacements from 50 cm3 to 500 cm3 [3.05 in3 to 30.5 in3], recommended flows from 5 l/min to 70 l/min [1.32 US gal/min to 18.5 US gal/min], maximum steering pressures of 210 bar [3,045 psi], and maximum back pressures of 40 bar [580 psi]. Under normal conditions, they provide a low steering torque between 0.5 Nm and 3.0 Nm [4.43 lb-in and 26.6 lb-in] thanks to low-effort springs and a wide control range, and they are available in open-center non-reaction (ON), open-center reaction (OR), closed-center non-reaction (CN), and load-sensing (LS) configurations.
Features and benefits
- Low steering torque in normal steering situations
- Low noise level
- Low pressure drop
- Many types available: open center non-reaction, open center reaction, closed center non-reaction, and load sensing
- Optional port connections according to ISO, SAE, or DIN standards
Applications
- Tractors
- Harvesters
- Fork lifts
- Other contractor machines and special small to large vehicles
Specifications
| Ambient temperature | -30°C to 60°C [-22°F to 140°F] |
| Permissible surface temperature (non-activated unit) | 120°C [248°F] for 20 minutes |
| Permissible oil temperature | -30°C to 100°C [-22°F to 212°F] |
| Recommended oil temperature | 30°C to 60°C [86°F to 140°F] |
| Oil viscosity | 10 mm2/s to 1000 mm2/s [59 SUS to 4,629 SUS] |
| Recommended oil viscosity | 12 mm2/s to 80 mm2/s [66 SUS to 370 SUS] |
| Maximum contamination (ISO 4406) | ON/OR 22/20/17 LS/CN/PB 21/19/16 |
| Maximum temperature difference from other hydraulics | Δ10°C [Δ18°F] |
| Normal steering torque | 0.8 Nm to 3.0 Nm [7.08 lb-in to 26.55 lb-in] |
| Maximum manual steering torque | 120 Nm [1,062 lb-in] |
| Maximum momentary load steering torque | 240 Nm [2,124 lb-in] |
For more details, see the technical information.