Rexroth A4VSG Series 71cc Axial Piston Variable Pump HD1D Hydraulic Control Open Circuit

Key Features

· Variable swashplate design, smooth flow reversal across neutral position

· Nominal pressure: 350 bar; Max pressure: 400 bar

· Displacement: 71 cm³/rev

· Modular construction, optional through-drive for tandem pump installation

· Visual swivel angle indicator, convenient for onsite monitoring

· Strong axial & radial shaft load capacity

· Metric ISO mounting flange, parallel keyed drive shaft DIN 6885

Technical Parameters

Specification:

Application Scenarios

· Marine deck machinery hydraulic system

· Mining & quarry heavy equipment

· Large industrial hydraulic power unit

· Metal forging & hydraulic press

· Heavy material handling machinery

Competitive Advantage:

1. This Rexroth A4VSG71HD1D/11R-PPB10H029N (R902445110) is a closed-circuit variable piston pump with HD hydraulic control. It provides stepless displacement adjustment and bidirectional oil flow for smooth forward and reverse switching, ideal for hydrostatic travel drive systems of crawler cranes and large agricultural machinery.
2. Designed for high pressure up to 350 bar rated and 400 bar peak pressure, this A4VSG pump has precisely ground friction pairs, high volumetric efficiency and low noise. It maintains good thermal performance under continuous heavy load and reduces unexpected downtime.
3. It supports through-drive extension to connect other pumps for combined hydraulic systems with flexible layout. As a proven Rexroth closed-loop drive solution, it has readily available spare parts and easy maintenance, making it a preferred power unit for hydrostatic equipment repair and retrofit.

The Analysis For Rexroth A4VSG Closed Circuit Piston Pump Common Breakdown :

1. Slow travel speed adjustment and jerky forward-reverse switching. It is generally caused by stuck HD control spool, insufficient pilot pressure or blocked control oil circuit. It leads to poor and delayed travel control of crawler cranes and farm machines, bringing operation risks.
2. Low closed-loop pressure and weak driving force under load. It mainly results from heavy internal leakage due to worn pistons and valve plate, or insufficient charge pump flow. The machine lacks power for climbing or loaded travel and cannot meet heavy-duty driving requirements.
3. Fast temperature rise with vibration and abnormal noise. Common triggers include contaminated hydraulic oil, blocked charge filter and air ingression. Continuous high heat accelerates seal aging and worsens internal leakage, and may burn out internal components in severe cases.