Overview
The ZF 4699.825.211 GP25 is a genuine OEM gear pump assembly engineered for demanding construction machinery applications. This critical component sits within the transmission’s hydraulic control system, generating the precise oil flow and pressure required for clutch engagement, lubrication, and torque converter charging. As a positive-displacement pump, the GP25 ensures consistent hydraulic power delivery across the entire operating range. The SKU 4699.825.211 is a direct replacement part, manufactured to ZF’s original tolerances for seamless integration into the transmission housing assembly.
Symptoms of Failure
When the ZF 4699.825.211 GP25 begins to wear, operators typically notice these specific failure indicators:
- Erratic gear engagement or slipping: Insufficient hydraulic pressure from a worn pump causes delayed or incomplete clutch pack application, leading to gear slippage under load.
- Transmission overheating: Reduced oil flow diminishes the transmission’s cooling capacity, causing elevated operating temperatures that accelerate internal wear.
- Low hydraulic pressure at idle: A failing GP25 pump often cannot maintain adequate pressure when the engine is at low RPM, resulting in sluggish machine response.
- Visible oil contamination: Internal pump wear generates metallic debris in the hydraulic fluid, which can be detected during routine oil sampling or filter inspection.
Technical Specifications
| Parameter | Specification |
|---|---|
| OEM Part Number | 4699.825.211 |
| Product Designation | GP25 Gear Pump |
| Housing Material | High-strength aluminum alloy |
| Gear Material | Case-hardened steel |
| Weight (approx.) | 4.2 kg (9.3 lbs) |
| Displacement | 25 cc/rev |
| Maximum Operating Pressure | 25 bar (362 psi) |
| Mounting Flange | SAE A 2-bolt |
Compatibility
This genuine ZF 4699.825.211 GP25 pump is designed for use in the following ZF transmission models commonly found in construction machinery:
- ZF WG180 series (WG180, WG181)
- ZF WG200 series (WG200, WG201)
- ZF WG210 series
- ZF 4WG-200 series
During installation, the pump mounts directly into the 4699101155 HOUSING and is secured by the 0636100132 TORX SCREW fasteners. The 4699201018 HOUSING provides the oil gallery interface, while the 4699309077 HOUSING COVER seals the pump cavity. Always verify your transmission model and serial number before ordering.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4699101155 | HOUSING | Main transmission housing containing pump cavity |
| 4699201018 | HOUSING | Oil gallery housing for hydraulic circuits |
| 4699309077 | HOUSING COVER | Seals and protects pump assembly |
| 0636100132 | TORX SCREW | Fastener for pump mounting |
| 0631302072 | CYLINDRICAL PIN | Alignment pin for housing assembly |
| 0634801038 | SEALING RING | Prevents oil leakage at pump interface |
| 0636302013 | SCREW PLUG | Closes oil passages in housing |
| 0501319149 | SCREW PLUG | Magnetic drain plug for debris collection |
| 0637101790 | BREATHER | Equalizes pressure in transmission housing |
| 0631302221 | CYLINDRICAL PIN | Secondary alignment pin for cover |
