Parker MHP365 MHP350 Hydraulic Gear Pump | MHP365A178EWAB15-7 | Cast Iron

The Parker Commercial MHP Series from LIC Hydraulic is a premium line of Heavy-Duty Cast Iron Gear Pumps engineered for the most demanding mobile and industrial environments. Covering sizes from MHP25 to MHP76, as well as the high-capacity MHP350/365 models, this series features a robust three-piece cast iron construction for maximum durability. Our units, such as the MHP365A178EWAB15-7, are designed for 100% mechanical interchangeability with original OEM equipment. Every pump undergoes 100% simulated full-load bench testing to ensure it maintains superior efficiency and zero external leakage under pressures up to $4000\text{ psi}$.

Technical Specifications 

• Series: Parker Commercial MHP Series (MHP25, MHP37, MHP50, MHP75, MHP350, MHP365)

• Example Models: MHP365A178EWAB15-7, MHP350A578MEAB207

• Displacement: $1.5\text{ to }9.1\text{ in}^3\text{/rev}$ ($25\text{ to }150\text{ cc}$)

• Nominal Pressure: Up to $241\text{ bar}$ ($3500\text{ psi}$)

• Peak Pressure: Up to $275\text{ bar}$ ($4000\text{ psi}$)

• Max Speed: Up to $2400\text{ rpm}$

• Housing Material: High-tensile G3500 cast iron

• Gear Type: High-precision ground steel alloy gears

Key Technical Advantages

• Rugged Three-Piece Cast Iron Body: Engineered to resist case expansion even under extreme $3500\text{ psi}$ loads. The high-strength iron housing eliminates the risk of “gear tracking” and frame failure common in aluminum alternatives.

• Axial Pressure Balancing: Utilizing floating pressure plates that automatically adjust axial clearances, these pumps maintain over $95\%$ volumetric efficiency. This ensures consistent power delivery during high-temperature and low-RPM operation.

• High-Load Bearing Capacity: Equipped with heavy-duty needle bearings designed to handle high radial loads. This makes the MHP series ideal for PTO-driven applications where shaft side-loading is prevalent.

• Versatile Tandem Capability: The modular design allows for single, double, or triple pump configurations. Multiple sections can be stacked to provide independent flow for steering, braking, and implement circuits from a single drive source.

Application Areas

• Waste Management: Primary lift and compaction pumps for refuse trucks and rear loaders.

• Construction & Utility: Boom functions for mobile cranes, material handlers, and telehandlers.

• Mining & Quarrying: Reliable fluid power for underground LHDs and surface mining trucks.

• Agricultural Machinery: High-flow drives for seeders, spreaders, and harvesting attachments.

Expert Maintenance Tips

• Monitor Inlet Vacuum: Large displacement pumps like the MHP365 require substantial oil flow. Ensure the suction line is unrestricted; high vacuum will lead to cavitation, which erodes the internal thrust plates and creates excessive noise.

• Relief Valve Setting: Always set your primary relief valve to match the pump’s rated pressure. Excessive pressure spikes beyond $4000\text{ psi}$ can cause fatigue in the cast iron sections and lead to catastrophic internal failure.

• Maintain Oil Viscosity: Cast iron pumps generate significant internal heat during high-pressure cycles. Ensure your hydraulic fluid is rated for the operating temperature and maintain a cleanliness level of ISO 18/16/13 to protect the precision-ground gear teeth.