H1P078 Danfoss Hydraulic Piston Pump 78cc Variable Displacement

Product Overview

The H1P078 is a Danfoss H1 Series closed-circuit variable displacement axial piston pump designed for demanding hydrostatic transmission applications. Featuring a robust swash plate design, the pump delivers high power density, excellent efficiency, and precise control performance for mobile machinery and heavy-duty hydraulic systems.

Our H1P078 replacement pumps are manufactured to OEM-equivalent standards, offering excellent interchangeability with original Danfoss units. Every pump undergoes 100% simulated operating-condition testing to ensure reliable field performance and consistent hydraulic output.

Technical Specifications

• Product Series: Danfoss H1 Series
• Model: H1P078
• Pump Type: Variable Displacement Axial Piston Pump
• Circuit Type: Closed Loop Hydrostatic Transmission
• Design: Swash Plate Type
• Displacement: 78.1 cm³/rev
• Rated Speed: 3300 rpm
• Maximum Speed: 3800 rpm
• Maximum Working Pressure: 450 bar
• Peak Pressure: 480 bar
• Flow at Rated Speed: 273 L/min
• Control Options:
  • Electrical Displacement Control (EDC)
  • Manual Displacement Control (MDC)
  • Automotive Control (AC)
  • Forward Neutral Reverse (FNR)
  • Non-feedback Proportional Control
• Mounting Flange: SAE C 4-Bolt
• Shaft Options: 14T, 21T, 23T Splined Shafts
• Dry Weight: Approx. 56 kg
• Housing Oil Capacity: 2.0 L

Key Technical Advantages

High-Pressure Performance

Designed for severe-duty hydraulic applications with operating pressures up to 450 bar and peak pressures up to 480 bar.

High Volumetric Efficiency

Precision-machined rotating group components minimize internal leakage and improve power transmission efficiency.

Multiple Advanced Control Options

Available with electrical, manual, automotive, and proportional control configurations to suit diverse machine requirements.

OEM-Level Interchangeability

Direct replacement for original Danfoss H1 pumps with compatible mounting dimensions, shaft configurations, and hydraulic performance.

Long Service Life

Heavy-duty bearings, optimized lubrication circuits, and hardened internal components contribute to extended operational life.

100% Functional Testing

Every unit is tested for:

• Pressure Performance
• Flow Output
• Leakage Control
• Efficiency Verification
• Dynamic Load Operation

Application Areas

Suitable for:

• Excavators
• Skid Steer Loaders
• Road Rollers
• Asphalt Pavers
• Agricultural Harvesters
• Sprayers
• Forestry Equipment
• Mining Machinery
• Material Handling Equipment
• Port Machinery
• Hydrostatic Drive Vehicles

Expert Maintenance Tips

Hydraulic Fluid Selection

Use premium anti-wear hydraulic oil:

• ISO VG46
• ISO VG68

Maintain fluid cleanliness according to ISO 4406 22/18/13 or better.

Pre-Startup Procedure

• Fill housing with clean hydraulic oil before startup.
• Verify suction line sealing.
• Prevent dry running conditions.

Filtration Management

• Inspect filters after the first 500 operating hours.
• Replace filter elements every 1000 hours or according to contamination levels.

Pressure Monitoring

Avoid operating above specified pressure limits to protect pistons, valve plate surfaces, and bearing assemblies, ensuring maximum service life.