GMC4 Series Hydraulic Gear Pump | GMC4-40 GMC4-63 GMC4-80 | High Pressure Cast Iron Pump

The GMC4 Series heavy-duty gear pumps from Chengyuan Hydraulic are high-performance power units specifically engineered for high-pressure and harsh operating conditions. Featuring a high-strength ductile iron body, these pumps offer superior fatigue resistance and shock durability compared to standard aluminum alternatives. The GMC4 series (e.g., GMC4-40, GMC4-63) utilizes precision floating side-plate axial compensation technology, maintaining high volumetric efficiency across the entire 25MPa pressure range. Every unit from Chengyuan undergoes 100% simulated full-load condition testing to strictly verify flow output and thermal stability, guaranteeing 100% original-place interchangeability.

Technical Specifications :

• Model Range: GMC4-40, GMC4-50, GMC4-63, GMC4-80

• Nominal Displacement: 40, 50, 63, 80 mL/r

• Rated Operating Pressure: 25 MPa (250 bar)

• Peak Pressure: 31.5 MPa (315 bar)

• Rated Speed: 2000 rpm

• Maximum Speed: 2500 rpm

• Drive Shaft Type: Splined or Keyed shaft options

• Mounting Flange: Standard 2-hole or 4-hole SAE flange

• Fluid Compatibility: Anti-wear hydraulic oil (ISO VG 32/46/68)

Key Technical Advantages:

• Ductile Iron Housing Technology: The housing is precision-cast from QT500-7 high-strength ductile iron. This material sustains extreme hydraulic spikes and minimizes internal leakage by resisting body deformation, ensuring mechanical integrity under heavy cycles.

• Axial Pressure Compensation: Equipped with automatic floating bushings that use hydraulic feedback to remain perfectly flush with the gear faces. This technology maintains volumetric efficiency above 95% and compensates for wear over the pump’s lifespan.

• High-Load Composite Bearings: Features premium high-load DU bushings providing an extremely low friction coefficient under high speed and pressure. Excellent heat dissipation extends continuous operation time and reduces the pump’s thermal footprint.

• Precision Ground Gear Sets: Gears are crafted from high-strength alloy steel, vacuum carbonitrided, and micron-level ground. This precision reduces mechanical noise and, combined with optimized unloading grooves, eliminates the “trapped oil” phenomenon.

Application Areas:

• Environmental Equipment: High-pressure power for garbage compactors and road sweepers.

• Lifting Machinery: Primary oil pump for truck-mounted cranes and heavy-duty forklifts.

• Mining Equipment: Auxiliary hydraulic circuits for compact mining machinery and tunnel headers.

Expert Maintenance Tips:

• System Flushing: As a high-pressure pump, the GMC4 is sensitive to particulates. Thoroughly flush the hydraulic circuit and replace return filters with a rating of at least 20μm before installing a new pump.

• Inlet Velocity Control: To prevent cavitation, the suction line diameter must ensure a velocity between 0.5-1.5 m/s. Avoid kinks in the suction hose to prevent instantaneous heat damage caused by air ingestion.

• Initial No-Load Run: After installation, “jog” the motor 3-5 times at zero pressure to bleed air. Run at low pressure for 10 minutes before applying load. Never accelerate the pump under load until the air is fully purged.