Rexroth A4VG90 SEAL KIT

The Rexroth A4VG90 Seal Kit is a genuine sealing set designed for the rebuild and overhaul of Rexroth’s A4VG90 variable displacement axial piston pump. It contains the shaft seals, O-rings, and gaskets needed to properly reseal the pump housing, control valve, and rotary group during a rebuild, restoring sealing integrity without the cost of sourcing a full replacement pump.

The A4VG90 is a 90cc swashplate-design piston pump built for closed-circuit hydrostatic transmissions, commonly rated for continuous pressures around 350 bar with peak pressures up to 400–450 bar depending on configuration. It’s a core component in the drivetrain of construction machinery, agricultural vehicles, and industrial equipment that rely on smooth, variable-flow hydrostatic drive. Because the pump’s swashplate angle continuously changes to vary displacement, its internal and external seals are under constant mechanical stress — any deterioration here shows up quickly as case leakage, reduced drive efficiency, or contamination entering the rotary group.

Rebuilding with a genuine Rexroth seal kit rather than a generic aftermarket set keeps every seal matched to the exact material grade and tolerances the A4VG90 was engineered around — an important detail in a pump that operates at such high working pressures. Reseal work done with the correct kit during scheduled maintenance helps prevent drive-line leaks, protects the rotary group from contamination, and keeps the pump’s variable-displacement performance close to factory spec.

Technical Features

• Genuine Rexroth-spec seal kit
• Designed for the A4VG90 pump rebuild and reseal
• Compatible with A4VG90 closed-circuit variable displacement piston pump (350 bar continuous, up to 400–450 bar peak)
• Restores sealing integrity across housing, control valve, and rotary group
• Helps prevent case leakage and contamination during operation
• Suited to construction, agricultural, and industrial hydrostatic drive systems

Compatible Pump Model

• Rexroth A4VG90 (closed-circuit variable displacement axial piston pump)

Alternative Part Numbers

• Casappa 62046601 Seal Kit
• Caterpillar 7T-4515 Seal Kit
• Safim SG14706 Seal Kit

Shop & Supply stocks the Rexroth A4VG90 Seal Kit for immediate dispatch, as part of a broader lineup of genuine seal kits for Rexroth, Casappa, Caterpillar, and Safim hydraulic pumps. Choosing the original kit means the exact material grade and tolerances your A4VG90 pump was designed around — dependable sealing performance through every rebuild.