ZF 4699.825.176 GP25 | OEM Genuine Part

Overview

The ZF 4699.825.176 GP25 is a precision-engineered genuine OEM part designed for the hydraulic control system within ZF heavy-duty transmissions. This component, identified by the SKU 4699.825.176, functions as a critical pressure-regulating valve or clutch piston assembly, directly managing fluid flow to the gear sets. It sits within the valve body or clutch housing, ensuring smooth engagement and disengagement of gears under high torque loads. As a factory-spec GP25 unit, it guarantees exact fitment and hydraulic performance, making it essential for maintaining the integrity of your transmission’s shift logic.

Symptoms of Failure

When the ZF 4699.825.176 GP25 begins to wear, operators often notice specific performance issues. Look for these failure indicators to catch problems early:

• Erratic or delayed gear engagement: The transmission hesitates or slams into gear, especially under load, due to inconsistent hydraulic pressure from a worn GP25.
• Internal hydraulic leaks: You may find low fluid levels or oil residue around the transmission housing, indicating the GP25’s sealing surfaces have degraded.
• Torque converter shudder: A vibration or shudder during acceleration at low speeds suggests the GP25 is failing to modulate clutch pressure correctly.
• Transmission overheating: Slipping clutches caused by a faulty GP25 generate excess heat, leading to elevated operating temperatures and potential fluid breakdown.

Technical Specifications

Compatibility

This GP25 component is engineered for use in ZF’s WG series powershift transmissions commonly found in construction machinery. It is directly compatible with the WG180, WG200, and WG250 models. It also fits select ZF 4WG-200 and ZF 5WG-200 variants used in wheel loaders, graders, and telehandlers. Always verify your transmission serial number before installation.

When replacing the 4699.825.176 GP25, it is highly recommended to inspect and replace the 4699025018: GP25 as a matched pair to ensure balanced hydraulic flow. Additionally, check the 4699101158: HOUSING for cracks or scoring, and verify the 4699102095: INPUT shaft and 4699103041: OUTPUT shaft for wear, as these components work in tandem with the GP25 to maintain drivetrain integrity.

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