Overview
The ZF 4699.825.219 GP25 is a precision-engineered gear pump assembly designed for high-stress hydraulic circuits within ZF construction machinery transmissions. This OEM genuine part, identified by SKU 4699.825.219, serves as the primary hydraulic power source for clutch actuation and lubrication circuits. Positioned directly on the transmission housing, the GP25 draws fluid from the sump and delivers consistent pressure to the valve body. When paired with a compatible HOUSING, this unit ensures reliable oil flow for gear engagement and cooling. The 4699.825.219 is a direct replacement for worn assemblies, restoring original pump efficiency and preventing system pressure drops that compromise transmission performance.
Symptoms of Failure
- Delayed gear engagement or slipping under load: A worn GP25 fails to maintain adequate hydraulic pressure, causing hesitation when shifting into forward or reverse. This symptom often appears during cold starts or heavy excavation cycles.
- Audible whining or cavitation noise from the transmission: As internal clearances increase, the pump struggles to draw oil, producing a high-pitched whine. This indicates air ingestion or insufficient fluid supply to the INPUT side.
- Visible hydraulic oil leaks near the pump mounting flange: Degraded seals or housing cracks allow oil to escape, leaving puddles under the equipment. Check the OUTPUT port for seepage.
- Erratic clutch operation or transmission overheating: Reduced flow from the 4699.825.219 leads to insufficient lubrication, causing thermal buildup and erratic clutch pack engagement.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 4699.825.219 (GP25) |
| Type | Gear Pump Assembly |
| Displacement | 25 cc/rev (estimated) |
| Maximum Pressure | 25 bar (363 psi) |
| Material | High-strength cast iron housing with hardened steel gears |
| Weight | 4.2 kg (9.3 lbs) |
| Mounting Flange | SAE A 2-bolt pattern |
| OEM Reference | ZF 4699.825.219 |
Compatibility
This GP25 pump is engineered for ZF WG series transmissions commonly used in wheel loaders, graders, and telehandlers. It directly fits the WG180, WG200, and WG210 models. The 4699.825.219 also integrates with earlier variants of the WG150 series when used with the correct GP25 adapter kit. For optimal sealing, always replace the SEALING RING and SCREW PLUG during installation. Verify housing compatibility using the HOUSING reference for your specific transmission serial number.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4699025086 | GP25 | Alternate gear pump variant for high-flow applications |
| 4699101157 | HOUSING | Main transmission housing for pump mounting |
| 4699102095 | INPUT | Input shaft assembly for torque converter |
| 4699103075 | OUTPUT | Output flange for driveline connection |
| 4699201018 | HOUSING | Intermediate housing for auxiliary drives |
| 4699309080 | HOUSING COVER | Sealing cover for pump access port |
| 0636100132 | TORX SCREW | Fastener for pump housing retention |
| 0631302072 | CYLINDRICAL PIN | Alignment dowel for pump positioning |
| 0634801038 | SEALING RING | O-ring for hydraulic port sealing |
| 0636302013 | SCREW PLUG | Threaded plug for pressure test port |
