M7G-3N1D-02 Hydraulic Piston Motor | Denison M7 Series | High Pressure M7G M7F Replacement
| Model Number | M7G-3N1D-02 |
|---|
Product Description
LIC Hydraulic’s Denison M7G Series (encompassing M7G, M7F, and M6F) represents the industry standard for heavy-duty axial piston motors. The M7G-3N1D-02 model is specifically engineered for environments where failure is not an option—such as underground mining, tunneling, and deep-hole drilling. Our units offer 100% drop-in interchangeability with original Parker/Denison components. To guarantee reliability, every motor is subjected to 100% simulated operational load testing, ensuring optimal torque performance and efficiency at pressures up to 350 bar.
Technical Specifications
Model Code: M7G-3N1D-02
Series: M7 Series (Design 7)
Displacement: 111.4 cm³/rev (6.80 in³/rev)
Rated Pressure: 350 bar (5000 psi)
Peak Pressure: 420 bar (6000 psi)
Max Operating Speed: 3000 rpm
Rotation: 3N (Bi-directional)
Shaft Type: 1 (Standard Keyed or Splined per SAE specifications)
Control Type: D (Fixed Displacement)
Design Sequence: 02
Seals: FKM (Viton) for high thermal and chemical resistance
Key Technical Advantages
Heavy-Duty Swashplate Design: Forged with premium alloy steel, the swashplate and piston group are built to withstand the violent pressure spikes and shock loads typical of mining applications.
Superior Volumetric Efficiency: Precision-lapped valve plates minimize internal leakage even at 5000 psi, ensuring maximum power delivery and reduced heat generation within the hydraulic circuit.
High Starting Torque: The hydrostatic balance design of the piston shoes ensures a smooth, high-torque start under full load, eliminating low-speed “cogging” or stall issues.
Reinforced Bearing System: Oversized heavy-duty bearings are utilized to handle high radial loads and harsh environmental contaminants, significantly extending the service interval.
Application Areas
Mining Equipment: Underground drill jumbos, coal haulers, and surface blast hole drills.
Tunneling: TBM (Tunnel Boring Machine) thrust drives and auxiliary hydraulic systems.
Construction Machinery: Rotary drilling rigs, heavy-duty winches, and crawler drives.
Marine & Offshore: Deck machinery, slewing drives for cranes, and winch motors.
Expert Maintenance Tips
Mandatory Case Priming: Before the initial startup or after a long period of inactivity, the motor case must be filled with clean hydraulic fluid through the highest drain port. Dry starts will result in immediate catastrophic damage to the rotating group.
Case Drain Pressure Control: Ensure the case drain line is connected directly to the reservoir with a back pressure of less than 2 bar (30 psi). Excessive case pressure is the leading cause of shaft seal failure.
Fluid Filtration: Maintain fluid cleanliness at ISO 18/16/13 or better. Given the precision of the M7G series, high-quality return line filtration is essential to prevent abrasive wear on the cylinder block and piston shoes.
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