ZF 4699.025.081 GP25 | OEM Genuine Part

Overview

The ZF 4699.025.081 GP25 is a genuine OEM gear pump assembly engineered for high-pressure hydraulic actuation within ZF construction machinery transmissions. This part, identified by SKU 4699.025.081, serves as the primary hydraulic power source for clutch engagement and lubrication circuits. It mounts directly to the transmission housing, drawing oil from the sump and delivering precise flow to the valve body and torque converter. The GP25 designation indicates a specific displacement and pressure rating optimized for heavy-duty off-highway applications. When installed alongside the 4699101157 HOUSING and 4699201018 HOUSING, this pump ensures reliable oil circulation under extreme loads.

Symptoms of Failure

• Delayed gear engagement or slipping: Worn internal gears reduce volumetric efficiency, causing sluggish clutch pack application and transmission shudder under load.
• Low hydraulic pressure at idle: A failing GP25 pump cannot maintain minimum standby pressure, triggering warning lights or error codes on the machine display.
• Excessive transmission oil temperature: Internal leakage generates heat; operators may notice the oil running hotter than normal, often accompanied by a burnt smell.
• Whining or cavitation noise: Air ingestion from a worn seal or damaged housing cover creates a high-pitched sound, especially during cold starts or high-RPM operation.

Technical Specifications

Compatibility

This genuine ZF GP25 pump is designed for use in the following transmission families commonly found in wheel loaders, graders, and telescopic handlers:

• ZF WG180 series (WG180, WG181)
• ZF WG200 series (WG200, WG201)
• ZF 4WG-200 powershift transmissions
• ZF 6WG-250 heavy-duty units

Always verify the pump mounting pattern and drive tang dimensions against your existing unit. The 4699309080 HOUSING COVER and 0636100132 TORX SCREW are commonly replaced concurrently to prevent oil leaks and ensure proper pump retention.

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