ZF 4699.825.178 GP25 | OEM Genuine Part

Overview

The ZF 4699.825.178 GP25 is a critical OEM genuine gear set component engineered for high-stress planetary transmissions used in construction machinery. Positioned within the main drive train of ZF’s heavy-duty gearboxes, this part facilitates precise torque distribution and smooth power flow between the input shaft and output assembly. The SKU 4699.825.178 is specifically designed to maintain factory-specified gear mesh tolerances, ensuring optimal load handling during excavation, grading, and material handling operations. As a direct replacement for worn or damaged gear sets, this part restores transmission efficiency and prevents cascading wear to adjacent components.

Symptoms of Failure

When the ZF 4699.825.178 GP25 begins to fail, operators typically notice these specific issues:

• Intermittent gear slipping under load – The transmission may momentarily lose power transfer when climbing grades or lifting heavy loads, indicating worn gear teeth on the GP25 set.
• Metallic grinding noise from the transmission housing – A distinct whine or chatter during acceleration often points to pitting or chipping on the gear surfaces of part 4699.825.178.
• Oil contamination with metallic debris – Visible silver or bronze particles in the transmission fluid signal advanced wear of the gear set, requiring immediate replacement to avoid damage to the 4699101156 HOUSING.
• Delayed engagement or harsh shifting – Worn gear profiles can cause erratic clutch engagement, often accompanied by vibration in the driveline.

Technical Specifications

Compatibility

This GP25 gear set is engineered for ZF’s WG series powershift transmissions commonly deployed in wheel loaders, dozers, and telehandlers. It is a direct fit for the following models:

• ZF WG180 – All variants (WG180/181/182)
• ZF WG200 – Standard and heavy-duty configurations
• ZF WG210 – Select models with planetary reduction
• ZF 4WG-200 – Four-speed versions

For complete assembly, this part works in conjunction with the 4699025015 GP25 companion gear and must be paired with the 4699102095 INPUT shaft and 4699103075 OUTPUT flange for proper alignment. Always inspect the 4699101156 HOUSING for wear when replacing this gear set.

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