ZF 4699.825.007 GP25 | OEM Genuine Part

Overview

The ZF 4699.825.007 GP25 is a genuine OEM gear pump assembly engineered for high-pressure hydraulic actuation within ZF powershift transmissions. This component, identified by SKU 4699.825.007, is mounted directly to the transmission housing and serves as the primary fluid mover, supplying pressurized oil for clutch engagement, lubrication, and torque converter charging. As a critical flow-control element, it ensures consistent hydraulic pressure across the transmission’s valve body and clutch packs. The GP25 designation indicates a specific displacement and pressure rating optimized for heavy-duty construction machinery applications, where reliability under continuous load is non-negotiable.

Symptoms of Failure

• Intermittent gear slipping under load: When the GP25 pump loses volumetric efficiency, clutch packs receive insufficient pressure, causing hesitation or slipping during excavation or grading operations.
• Low hydraulic pressure at idle: Worn internal gears or a scored housing bore result in pressure drops below 15 bar at low engine RPM, triggering warning lights on the dash.
• Whining or cavitation noise from the transmission: Air ingestion due to a failing pump seal produces a high-pitched whine, often accompanied by foamy oil on the dipstick.
• Visible oil seepage around the pump mounting flange: Degraded O-rings or a cracked housing allow transmission fluid to weep externally, leaving residue on the bell housing.

Technical Specifications

Compatibility

This GP25 pump is designed for ZF WG-series powershift transmissions commonly found in wheel loaders, graders, and telehandlers. It is a direct replacement for the following transmission models:

• ZF WG180 – Used in compact construction loaders
• ZF WG200 – Mid-range wheel loaders and backhoes
• ZF WG210 – Heavy-duty excavator applications
• ZF WG310 – Large mining and quarry equipment

During installation, the pump mounts between the 4699101155: HOUSING and the 4699201018: HOUSING assembly. The 4699309077: HOUSING COVER seals the pump cavity, while the 0636100132: TORX SCREW secures the entire stack. Always inspect the mating surfaces for scoring before reassembly.

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