Vickers VTM42 Hydraulic Steering Vane Pump | VTM42-40-30-10 | Fixed Displacement Rotary Pump

The VTM42 Series hydraulically balanced vane pumps from Chengyuan Hydraulic are high-performance power steering pumps fully compatible with Vickers (Eaton) engineering standards. Specifically designed for commercial vehicles, buses, and mobile equipment, the VTM42 series (e.g., VTM42-40-30-10) features a high power-to-weight ratio. Its standout feature is the integration of flow control and safety relief valves within the pump cover, simplifying hydraulic circuit architecture. Every VTM42 pump undergoes 100% simulated full-load condition testing before delivery to ensure pressure stability and flow precision match OEM standards, guaranteeing 100% original-place interchangeability.

Technical Specifications 

• Core Model Codes: VTM42-40-30, VTM42-40-35, VTM42-10/15

• Ring Size (Displacement): 10, 15, 20, 40, 50, 60

• Controlled Flow: 1.5 GPM to 7.5 GPM (approx. 5.7 – 28 L/min)

• Maximum Operating Pressure: 140 bar (2000 psi)

• Relief Valve Setting: 50 bar to 140 bar (customizable per code)

• Maximum Rated Speed: 4250 rpm

• Inlet Port Type: Manifold or Threaded Inlet

• Drive Shaft Type: Woodruff Key or Splined Shaft

• Weight: Approx. 5.5 kg

Key Technical Advantages:

• Hydraulically Balanced Rotor Design: The VTM42 utilizes Vickers’ classic balanced construction, where radial hydraulic loads cancel each other out. This drastically reduces bearing stress, ensuring exceptional service life and ultra-low noise levels even at high speeds.

• Integrated Control Circuitry: The pump cover houses a precision-ground flow control spool and a pilot-operated relief valve. This allows the system to maintain a constant steering flow without external valve blocks and protects against instantaneous overpressure during steering end-stops.

• Superior Self-Priming & High-Speed Performance: Tailored for the variable engine speeds of mobile machinery, the blade-to-stator contact curve is optimized. This maintains stable suction during cold starts or high-RPM operation, preventing cavitation.

• High-Strength Ductile Iron Housing: The pump body is made of high-density cast iron with excellent fatigue and thermal shock resistance. Coupled with hardened stator rings and vanes, it ensures minimal volumetric efficiency loss throughout its life cycle.

Application Areas:

• Commercial Vehicles: Steering assist pumps for heavy-duty trucks and long-haul buses.

• Agriculture & Forestry: Power steering sources for tractors and combine harvesters.

• Material Handling: Steering power circuits for forklifts and port tow tractors.

Expert Maintenance Tips:

• Fluid Cleanliness Standards: Vane pumps are sensitive to particulate contamination. Maintain ISO 18/16/13 cleanliness with 10-25 micron filtration to prevent vane sticking in rotor slots.

• Prohibition of Dry Running: After installation, manually prime the pump with hydraulic oil through the inlet. Never start the engine without oil in the pump, as this will cause immediate scoring of the stator ring.

• Drive Belt/Coupling Inspection: Over-tightened belts cause abnormal radial bearing loads, while loose belts cause RPM fluctuations affecting steering “feel.” Regularly check drive tension for optimal performance.