101S-1 & 101S-2 Series Hydraulic Steering Control Units
The 101S-1 and 101S-2 series of fully hydraulic steering units inherit the steering functions of the 101 series, from their structure to their operating principles.
Description:
The 101S-1 and 101S-2 hydraulic steering control units are designed for agricultural machinery, construction equipment and mobile hydraulic systems. Their compact housings can be configured with relief, shock, suction and check valves according to steering circuit requirements.
The series supports open-center non-reaction and open-center reaction functions. Both versions are available from 50 to 200 mL/rev., while the 101S-1 version extends to 1,000 mL/rev.
Key Specifications
• Function options: 101S-1 open center non-reaction and 101S-2 open center reaction.
• Displacement range: 50–1,000 mL/rev.
• Rated flow range: 5–75 L/min.
• Max. input pressure: 17.5 MPa.
• Max. continuous back pressure: 2.5 MPa.
• Multiple relief valve, shock valve and port-code options available.
• Integrated relief, shock, suction and check valves available according to system requirements.
Function Options
Choose the steering function according to system response and application requirements.
101S-1
• Open Center Non-Reaction
• Available displacement range: 50–1,000 mL/rev.
• Integrated valve options available
• Multiple pressure and port configurations
101S-2
• Open Center Reaction
• Available displacement range: 50–200 mL/rev.
• Integrated valve options available
• Multiple pressure and port configurations
Displacement & Rated Flow Options
Compare available displacement, rated flow and overall unit length for preliminary selection.
101S-1 / 101S-2: 50–200 mL/rev.
50 mL/rev.
- Rated Flow: 5 L/min
- Dimension L: 130 mm
63 mL/rev.
- Rated Flow: 6 L/min
- Dimension L: 131 mm
80 mL/rev.
- Rated Flow: 8 L/min
- Dimension L: 133.5 mm
100 mL/rev.
- Rated Flow: 10 L/min
- Dimension L: 136 mm
125 mL/rev.
- Rated Flow: 12.5 L/min
- Dimension L: 139 mm
160 mL/rev.
- Rated Flow: 16 L/min
- Dimension L: 144 mm
200 mL/rev.
- Rated Flow: 20 L/min
- Dimension L: 149 mm
101S-1 Only: 250–1,000 mL/rev.
250 mL/rev.
- Rated Flow: 25 L/min
- Dimension L: 155 mm
280 mL/rev.
- Rated Flow: 28 L/min
- Dimension L: 160 mm
315 mL/rev.
- Rated Flow: 31.5 L/min
- Dimension L: 165 mm
370 mL/rev.
- Rated Flow: 37 L/min
- Dimension L: 172 mm
400 mL/rev.
- Rated Flow: 40 L/min
- Dimension L: 175 mm
500 mL/rev.
- Rated Flow: 50 L/min
- Dimension L: 187 mm
630 mL/rev.
- Rated Flow: 50 L/min
- Dimension L: 212 mm
740 mL/rev.
- Rated Flow: 56 L/min
- Dimension L: 226 mm
800 mL/rev.
- Rated Flow: 60 L/min
- Dimension L: 232 mm
1,000 mL/rev.
- Rated Flow: 75 L/min
- Dimension L: 256 mm
Pressure & Integrated Valve Settings
Select pressure and integrated valve settings according to system requirements.
System Pressure Limits
• Max. Input Pressure: 17.5 MPa
• Max. Continuous Back Pressure: 2.5 MPa
Integrated Valve Settings
• Relief Valve Settings: 6, 7, 8, 10, 12, 14, 15, 16 or 17.5 MPa
• Shock Valve Settings: 12, 13, 14, 16, 18, 20, 21, 22 or 23.5 MPa
• The shock valve pressure is set 6 MPa higher than the selected relief valve pressure.
Port & Mounting Options
Review available port threads, mounting connections and oil-port connection options for preliminary configuration.
Metric Port Options
• M18×1.5
• M20×1.5
• M22×1.5
• Straight-thread and O-ring options
BSPP & UNF Port Options
• G1/2
• G1/2 O-ring
• 3/4-16UNF O-ring
• 9/16-18UNF O-ring
Mounting Connection Options
• M10 flange connection
• M10×1.25 flange connection
• 3/8-16UNC flange connection
• Multiple mounting thread configurations
Oil Port Connection Threads
• M12 connection thread
• M10 and M10×1 connection threads
• 3/8-24UNF connection thread
• Port-code-specific configurations
Port and mounting configurations depend on the selected port code. Please provide the existing model, nameplate, port dimensions, flange connection threads and application requirements for final confirmation.
Reference depths: P, T, L and R ports — 15 mm; column mounting C and V — 16 mm.
How to Specify a 101S Steering Control Unit
Order Code Format:
101S – Function Code – Displacement – Relief Valve Setting – Port Code
Example: 101S-1-125-10-E
101S-1: Open-Center Non-Reaction
125: 125 mL/rev. displacement
10: 10 MPa relief valve setting
E: G1/2 oil ports with M10 flange connection
For this example, the shock valve setting is 16 MPa, which is 6 MPa higher than the selected relief valve setting.
Designed for reliable steering performance
Integrated valve options
Available with relief, shock, suction and check valve options for different steering circuit requirements.
Smooth steering control
Provides stable and responsive steering performance for mobile machinery and hydraulic vehicles.
Compact hydraulic circuit design
Combines metering and control functions in a compact structure to simplify hydraulic system layout.
Stable operation at rated pressure
Designed for consistent steering performance under rated flow and pressure conditions.
Applications
Tractors & agricultural machinery
Construction equipment
Material handling & mobile machinery
Need Help Matching a Steering Unit?
Not sure which steering unit model matches your machine or replacement requirement? Send us the existing model number, nameplate photo, displacement, port information, dimensions, or machine application details. Our team can help identify a suitable steering control unit and prepare a quotation.
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