Danfoss OSP Series Hydraulic Steering Units
Why the OSP series?
- Low steering effort — typically 0.5 to 3.0 N·m in normal steering, depending on the unit.
- Emergency steering — most units act as a manual pump if pump supply fails, keeping you in control.
- Built-in valve options — pressure relief, shock, suction and non-return functions available across the range.
- ISO, SAE or DIN port connections to suit your build.
The range at a glance
OSPC — the versatile workhorse
For tractors, harvesters, forklifts and contractor machines. Open-centre, with a full suite of built-in valve functions.
- Displacement: 40–500 cm³/rev
- Recommended flow: 4–70 l/min
- Max steering pressure: 210 bar
- Versions: Open Centre Non-reaction (ON), Open Centre Reaction (OR), Load Sensing (LS/LSR)
OSPD — twin rotary meters for the heaviest jobs
Two mechanically linked rotary meters mean even the heaviest vehicles can be steered manually without an emergency pump.
- Manual steering: 60–125 cm³/rev (one meter active)
- Full supply: 185–440 cm³/rev (both meters active)
- Recommended flow: 19–70 l/min
- Max steering pressure: 210 bar
- Versions: ON, OR, LS, LSR
OSPF — best-in-class load-sensing control
A full-drain dynamic load-sensing unit that excels at controlling negative steering forces, with higher achievable steering speed.
- Displacement: 80–400 cm³/rev
- Flow: 8–40 l/min
- Max steering pressure: 210 bar
- Low steering torque: 0.5–1.8 N·m
OSPL — high-flow steering for large machines
Optimised for high steering flow on heavy forklifts, loaders and dumpers.
- Displacement: 520–1200 cm³/rev
- Flow: 52–100 l/min
- Max steering pressure: 240 bar
- Low pressure drop even at high flow
OSPU — built-in flow amplification
Adds flow directly to the cylinder ports, allowing heavier vehicles to be steered without an emergency pump. Selectable amplification factors of 2, 3 or 4, plus a "Fast Steer" progressive option.
- Manual steering: 60–125 cm³/rev
- Normal supply: 120–500 cm³/rev
- Flow: 8–50 l/min
- Max steering pressure: 210 bar
| Series | Description | Versions | Displacement (cm³/rev) | Recommended Flow (l/min) | Max Steering Pressure (bar) | Max Back Pressure (bar) | Steering Torque (Nm) |
| OSPC | Open centre and load sensing unit with built-in valve functions for tractors/harvesters/forklifts | ON, OR, LS, LSR | 40-500 | 4-70 | 210 | 40 | 0.8-3.0 |
| OSPD | Twin rotary meter unit for manual steering of heavy vehicles without emergency pump | ON, OR, LS, LSR | 60-125 manual / 185-440 full supply | 19-70 | 210 | 40 | 0.8-3.0 |
| OSPF | Full-drain dynamic load sensing unit with superior control of negative steering forces | LS dynamic | 80-400 | 8-40 | 210 | 40 | 0.5-1.8 |
| OSPL | High-flow load sensing unit optimised for large forklifts/loaders/dumpers | LS static, LS dynamic | 520-1200 | 52-100 | 240 | 40 | 0.8-3.0 |
| OSPU | Load sensing unit with built-in flow amplification (factors 2/3/4) for heavy vehicles | LS dynamic | 60-125 manual / 120-500 normal supply | 8-50 | 210 | 40 | 0.8-3.0 |
