OSPD hydraulic steering units
The OSPD is a dual-displacement steering unit that makes machines of almost any size easy to maneuver. Under normal conditions, both rotary meters are active, and if a steering pump fails, even heavy vehicles can still be steered with the help of a smaller rotary meter in a two-rotary-meter arrangement. The ratio between normal steering displacement and emergency steering displacement ranges from two to seven.
Features and benefits
- With two rotary meters, heavy vehicles can often be steered without an emergency steering pump
- Low noise
- Good steering controllability
- Low steering torque 0.8 Nm to 3.0 Nm [7.08 lbf-in to 26.6 lbf-in]
- High back pressure up to 40 bar [580 psi]
- One or several built in valve functions possible: pressure relief, shock, and suction in L + R; check valve in P and LS
Applications
- Small tractors
- Backhoe loaders
- Road building machinery
- Combines and harvesters
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 information, see