Rexroth A4VSO125 Hydraulic Piston Pump 280 Bar High Pressure

• Internal Leakage: Excessive internal leakage within the pump components converts hydraulic energy to heat.
• Mechanical Friction: Dry or semi-dry friction due to worn parts or inadequate lubrication generates heat.
• Fluid Friction: Inadequate tank capacity or cooling, causing the system to overheat.
• Clogged Return Line Filter: A blocked return filter creates high backpressure, leading to increased temperature.
• Low Oil Level: Insufficient oil in the reservoir reduces cooling capacity.

• Keep the pump exterior clean from dust and oil.
• Check oil levels before start-up and during operation.
• Listen for abnormal noises during operation, which may indicate internal issues like part wear or looseness.
• Regularly record operating parameters like pressure, flow, and temperature to monitor health.
• Change fluid filters periodically (e.g., every 1000 hours or as per conditions).
• Check and replace worn or aged seals.
• Follow lubrication requirements for various points.
• Inspect the coupling for looseness or wear.

If the pump outputs insufficient flow or no flow at all, possible causes include:

• Incorrect rotation direction
• Low fluid level in reservoir
• Clogged inlet strainer or filter
• Excessive pump wear
• Air in the system
• Pressure relief valve stuck open