ZF 4699.825.055 GP25 | OEM Genuine Part

Overview

The ZF 4699.825.055 GP25 is a precision-machined gear pump assembly designed for high-pressure hydraulic actuation within ZF off-highway transmissions. This OEM genuine part, identified by SKU 4699.825.055, serves as the primary hydraulic power source, delivering pressurized oil to the torque converter, clutch packs, and lubrication circuits. It mounts directly to the transmission housing and is driven by the engine through a gear train. For optimal sealing and structural integrity, this pump is often installed alongside the 4699101070 HOUSING and the 4699301146 HOUSING, which provide the mounting interface and fluid routing channels.

Symptoms of Failure

• Delayed or erratic gear engagement: When the GP25 pump loses volumetric efficiency, clutch pack fill times increase, causing hesitation when shifting from neutral to drive or reverse.
• Low system pressure and transmission overheating: Worn internal gears or a scored housing bore reduce flow, leading to inadequate lubrication and elevated sump temperatures.
• Whining or cavitation noise from the transmission: Air ingestion due to a failing suction seal or a cracked 4699309085 HOUSING COVER creates audible high-pitched sounds during operation.
• Hydraulic oil leaks at the pump mounting flange: Degraded O-rings or a warped mating surface allow fluid to escape, often pooling beneath the bell housing area.

Technical Specifications

Compatibility

This GP25 pump is a direct replacement for ZF WG180, WG200, and WG211 series powershift transmissions commonly used in wheel loaders, graders, and material handlers. It also fits select models of the ZF Ergopower and Ecolife series when equipped with the optional high-flow hydraulic package. Always verify the pump drive tang configuration and port orientation against your existing unit. The pump housing is secured using the 0636101411 CAP SCREW kit, and the suction port seal is maintained by the 0634801038 SEALING RING.

Related Components