H1P045 Danfoss Axial Piston Pump 45cc 420bar Closed Circuit

Product Overview

The H1P045 (and the broader H1P series including H1P053, H1P060, H1P068, H1P069, H1P078, H1P089, H1P100, H1P115, H1P130, H1P147, plus H1T tandem versions) is a high-performance closed-circuit variable-displacement axial piston pump from Danfoss. Featuring a cradle swash-plate design, the series offers displacements starting from 45 cm³/rev up to larger sizes, with maximum working pressures up to 450 bar (420 bar on selected frames). It is engineered for mobile hydrostatic transmissions. The pump is fully dimensionally and functionally interchangeable with genuine Danfoss units, allowing drop-in replacement without modification of mounting flange, shaft or piping. Every unit undergoes 100% simulated operating-condition testing to ensure volumetric efficiency, pressure response and service life meet original Danfoss standards.

Technical Specifications 

• Model: H1P045 (series covers H1P045 / H1P053 / H1P060 / H1P068 / H1P069 / H1P078 / H1P089 / H1P100 / H1P115 / H1P130 / H1P147 etc.; H1T for tandem)
• Displacement: H1P045 = 45.0 cm³/rev; H1P053 = 53.8 cm³/rev; H1P060 = 60.4 cm³/rev; H1P068 = 68.0 cm³/rev; higher frames increase progressively to H1P147 ≈ 147.2 cm³/rev
• Maximum working pressure: H1P045 = 420 bar; H1P053 = 380 bar; H1P060 = 420 bar; H1P068 = 380 bar; H1P069 and most higher frames = 450 bar
• Maximum pressure: up to 450–480 bar depending on frame
• Rated speed: H1P045/053 = 3400 rpm; H1P060/068 = 3500 rpm; higher frames lower (e.g. H1P115/130 = 3200 rpm)
• Maximum speed: H1P045/053 = 3500 rpm; H1P060/068 = 4000 rpm
• Minimum speed: 500 rpm (internal/external charge supply)
• Control options: Electric Displacement Control (EDC), FNR, NFPE, MDC, HDC and others; PLUS+1 compatible
• Mounting flange: SAE B 2-bolt (H1P045/053); SAE C or D 4-bolt for larger frames
• Weight (dry, without PTO/filter): approx. 41 kg (H1P045/053 single); approx. 50 kg (H1P060/068)
• Charge pressure range: approx. 14.5–16 bar minimum to 34–35 bar maximum
• Fluid recommendations: Per Danfoss guidelines (recommended viscosity 12–80 mm²/s)

Key Technical Advantages

1. Cradle swash-plate and precision rotating group enable bi-directional flow by tilting the swash plate across zero displacement, delivering high volumetric efficiency and low pressure pulsation.
2. Optimized main bearings and valve plate combined with high-performance shaft seals provide excellent durability under continuous high-pressure and high-speed operation.
3. Wide range of electro-hydraulic controls (including EDC) offer precise flow matching, fast response and PLUS+1 compatibility, with optional pressure limiters and high-pressure relief protection.
4. Full dimensional interchangeability with original Danfoss interfaces ensures drop-in replacement, minimizing downtime and retrofit costs on existing equipment.

Application Areas

• Construction machinery (skid-steer loaders, trenchers, asphalt pavers, vibratory rollers)
• Agricultural and turf equipment (mowers, sweepers, windrowers)
• Industrial and mobile systems (aerial lifts, mobile hydraulic power units)
• Other medium-to-high pressure closed-circuit hydrostatic transmissions requiring efficient variable displacement and reliable control

Expert Maintenance Tips

1. Always pre-fill the pump case with clean hydraulic fluid and bleed air from the highest case drain port before start-up to prevent dry-running damage to the swash plate and valve plate.
2. Maintain charge pressure within the recommended range (approx. 14.5–35 bar); insufficient charge pressure reduces control response and volumetric efficiency.
3. Monitor case pressure (rated ≤ 3 bar, maximum ≤ 5 bar); elevated case pressure is a primary cause of premature shaft-seal failure.
4. Use hydraulic fluid meeting Danfoss specifications and maintain proper system cleanliness. Replace filters and oil after initial run-in for maximum pump and system life.