ZF 4699.025.195 GP25 | OEM Genuine Part

Overview

The ZF 4699.025.195 GP25 is a genuine OEM gear pump assembly engineered for high-pressure hydraulic circuits within ZF construction machinery transmissions. This critical component delivers precise oil flow to actuate clutch packs and maintain lubrication in the valve body and torque converter circuits. As a positive-displacement pump, the GP25 ensures consistent hydraulic pressure during demanding loader, grader, and excavator operations. The SKU 4699.025.195 directly replaces the original factory unit, eliminating flow irregularities that degrade shift quality. This pump mounts directly to the transmission housing, interfacing with the 4699101071 HOUSING and the 4699301145 HOUSING to form a sealed pressure chamber.

Symptoms of Failure

• Intermittent gear slipping under load — When the GP25 pump loses volumetric efficiency, clutch packs cannot fully engage, causing the transmission to slip during acceleration or uphill travel. This is often misdiagnosed as a clutch failure.
• Low hydraulic pressure at idle — Worn internal gears or a scored pressure plate reduce output pressure below 80 psi at engine idle, triggering warning lamps or sluggish engagement in forward/reverse.
• Whining or cavitation noise from the transmission — Air entrainment from a failing pump seal produces a high-pitched whine, especially when cold. This indicates the pump is drawing air past the 0634801038 SEALING RING or the 0631302212 CYLINDRICAL PIN alignment.
• Visible oil leaks around the pump mounting flange — External seepage from the joint between the pump and the 4699309085 HOUSING COVER indicates a failed gasket or cracked pump body, requiring immediate replacement to avoid oil starvation.

Technical Specifications

Compatibility

This GP25 pump is designed for ZF WG series powershift transmissions commonly used in construction machinery. It is a direct fit for the following models: WG180, WG200, WG210, WG220, and WG240. The pump also serves as a service replacement for earlier WG150 and WG160 units when used with the updated 4699309085 HOUSING COVER. Always verify the drive tang orientation and port configuration against your existing pump before installation. For torque converter circuits in 8-speed models, confirm the pump depth matches the 4699101071 HOUSING cavity.

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