Overview
The ZF 0899.318.701 PUMP FLANGE is a critical hydraulic interface component within the WG 200 Series transmission. This OEM genuine part serves as the mounting and sealing point for the transmission’s hydraulic pump, ensuring precise oil flow and pressure regulation for clutch engagement and gear shifts. Located on the main transmission housing, the pump flange (SKU: 0899.318.701) directs pressurized fluid from the pump to the valve body. Without a properly sealed and dimensionally stable flange, the entire hydraulic circuit loses efficiency, leading to performance degradation in heavy-duty commercial vehicles and off-road machinery.
Symptoms of Failure
- Hydraulic fluid seepage around the pump mounting area: A worn or cracked 0899.318.701 flange often causes visible oil leaks at the pump-to-housing joint, leading to low fluid levels and eventual transmission overheating.
- Erratic or delayed gear engagement: When the pump flange loses its seal, hydraulic pressure drops, resulting in sluggish shifts or complete failure to engage forward or reverse gears under load.
- Unusual whining or cavitation noise from the transmission pump: A deformed flange can allow air ingestion into the hydraulic circuit, producing a high-pitched whine and reducing pump longevity.
- Intermittent loss of torque converter lockup: Pressure fluctuations caused by a failing flange disrupt the converter clutch, causing slippage and elevated transmission temperatures during highway operation.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 0899.318.701 |
| Material | High-strength cast aluminum alloy (EN AC-44100) |
| Overall Diameter | 185 mm |
| Bolt Hole Pattern | 6 x M10 on 150 mm PCD |
| Weight | 1.45 kg |
| Surface Finish | Anodized corrosion protection |
| OEM Reference | ZF 0899.318.701 (Genuine) |
| Sealing Surface | Flat ground to 0.02 mm tolerance |
Compatibility
This pump flange is engineered for the ZF WG 200 Series transmissions, including the WG180, WG200, and WG210 models. It directly interfaces with the 4644105420: DISCONNECTION assembly and mounts onto the 4644101232: TRANSMISSION HOUSING. For complete hydraulic integrity, it should be paired with the 4644303056: OUTPUT FLANGE and the 4644301282: TRANSMISSION HOUSING variant used in later production runs. Always verify your transmission serial number before ordering.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644105420 | DISCONNECTION | Clutch disconnection mechanism for PTO engagement |
| 4644303056 | OUTPUT FLANGE | Transfers torque to driveshaft |
| 4644101232 | TRANSMISSION HOUSING | Main structural casing for gear sets |
| 4644301282 | TRANSMISSION HOUSING | Alternate housing for WG200 series |
| 4475280043 | SCREW PLUG | Seals hydraulic test ports |
| 0634306198 | O-RING | Provides leak-proof seal at flange joint |
| 0730365067 | TYPE PLATE | Identification tag for transmission model |
| 4644301298 | COVER PLATE | Protects internal components from debris |
| 4644106300 | SHIFT SYSTEM | Controls gear selection via hydraulic valves |
| 4644306500 | COVER PLATE | Access cover for pump flange area |
