This is a Rexroth A4VG90 hydraulic pump, a high-performance variable displacement piston pump essential for the main hydraulic system of Volvo loaders. It generates the necessary hydraulic flow and pressure to power all functions, from steering to bucket actuation, and differs from a worn pump by delivering consistent, full-rated pressure and flow. Operators may experience a loss of power, slow or jerky implement movements, or the inability to lift heavy loads when this pump is failing.
Always verify with serial number before ordering.
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Flush hydraulic lines before fitting new components. Use only manufacturer-specified hydraulic fluid. Check O-rings and backup rings for correct orientation. Bleed air from system after installation.
Always consult the OEM service manual for model-specific torque values and procedures. WhatsApp our technical team if you need fitment guidance.
Early signs of a failing hydraulic pump include whining or groaning noises, reduced hydraulic system performance, and overheating. As the failure progresses, implement speeds will decrease, and the machine may lose its ability to lift or move loads effectively. Continued operation risks complete hydraulic system failure, rendering the equipment inoperable.
Thoroughly clean the hydraulic reservoir and lines before installing the new pump to prevent contamination. Ensure the pump shaft is properly aligned with the drive coupling to avoid premature wear.
Replace the hydraulic filter and inspect the hydraulic fluid for signs of wear particles or degradation.