ZF 4699.825.258 GP25 | OEM Genuine Part

Overview

This OEM genuine ZF 4699.825.258 GP25 is a critical gear pump assembly designed for high-pressure hydraulic actuation within ZF construction machinery transmissions. Positioned on the transmission’s auxiliary drive pad, this part delivers precise oil flow for clutch engagement and lubrication circuits. The SKU 4699.825.258 is engineered to meet ZF’s exacting tolerances, ensuring consistent pressure output even under heavy load cycles. When paired with a compatible 4699025164 GP25, this unit forms the hydraulic heart of the drivetrain, directly influencing shift quality and thermal management.

Symptoms of Failure

• Intermittent gear slipping under load: A worn 4699.825.258 pump loses volumetric efficiency, causing clutch packs to slip during excavation or grading operations.
• Hydraulic whine or cavitation noise: Degraded internal gears or scored housing surfaces produce a high-pitched sound, indicating air ingestion or insufficient fluid delivery.
• Delayed engagement or sluggish shifting: Reduced pump output pressure leads to slow clutch fill times, particularly noticeable when shifting from neutral to drive in cold conditions.
• Visible oil seepage at the pump mounting flange: Worn shaft seals or housing cracks allow fluid to escape, often mistaken for a simple gasket failure.

Technical Specifications

Compatibility

This GP25 pump is a direct fit for ZF WG180, WG200, and WG210 series transmissions commonly used in wheel loaders, telehandlers, and excavators. It also integrates with the 4699101154 HOUSING assembly and the 4699102106 INPUT shaft module. For complete driveline restoration, verify compatibility with the 4699103122 OUTPUT flange. Always cross-reference your transmission serial number to confirm fitment, as minor revisions exist across production years.

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