T6DC-038-025 31LB-00400 Parker Denison Double Vane Pump

Product Overview:

The T6DC-038-025 (part numbers 31LB-00400 / 31LH-00200, replacement for Hyundai 707565) is a Parker Denison fixed-displacement double vane hydraulic pump designed for steering systems and industrial hydraulics. Featuring balanced vane and cartridge construction, it delivers high volumetric efficiency, low noise and long service life. Manufactured to original Parker/Denison specifications for 100% drop-in interchangeability and fully tested under simulated operating conditions, this pump serves as a direct replacement for genuine T6 double pumps and Hyundai steering pumps, widely used in loaders, injection molding machines and hydraulic power units.

Technical Specifications 

• Models: T6DC-038-025 (31LB-00400 / 31LH-00200, replaces 707565)
• Geometric displacement: P1 (front, 038) = 120.3 ml/rev; P2 (rear, 025) = 79.3 ml/rev; total approx. 199.6 ml/rev
• Maximum working pressure: continuous up to approx. 240 bar (28 MPa, section-dependent)
• Speed range: max approx. 2200–2800 r/min
• Control type: Fixed displacement double vane pump, clockwise/counterclockwise selectable
• Mounting: SAE C flange
• Weight (approx.): 36.6–37 kg
• Key feature: Balanced vane design, independent cartridge for easy service
• Fluid: Anti-wear hydraulic oil

Key Technical Advantages:

1. Balanced vane design applies outlet pressure only to the pin; vane top and bottom areas are pressure-balanced, significantly reducing noise and improving volumetric efficiency.
2. Independent cartridge construction allows the pumping element to be replaced without removing the entire pump, minimizing downtime.
3. High pressure and flow capability in a compact envelope delivers excellent power density, ideal for steering and heavy-duty applications.
4. Full dimensional, interface and performance interchangeability with original Parker/Denison T6 and Hyundai 707565 units, backed by 100% simulated duty-cycle testing, ensures consistency, reliability and reduced maintenance costs.

Application Areas:

Hyundai wheel loader steering systems, injection molding machine hydraulic systems, machine tool feed and clamping circuits, industrial hydraulic power units, die-casting machines, plastics machinery, material handling equipment and other applications requiring stable high-pressure double vane pumps.

Expert Maintenance Tips:

1. Ensure suction lines are clear with adequate inlet pressure to prevent cavitation; maintain proper SAE flange alignment.
2. Fully fill and bleed the unit before first start-up. Use suitable anti-wear hydraulic oil; monitor oil temperature and filtration.
3. Periodically inspect the cartridge for wear; monitor case temperature and noise levels. Avoid prolonged operation above maximum pressure.
4. When replacing, confirm exact P1/P2 displacement codes, rotation direction and port positions. Cartridges can be replaced independently. Perform unloaded and loaded test runs after installation to verify proper function.