Overview
The ZF 4644.301.359 OIL FEED FLANGE is a precision-machined component engineered for the WG 200 series transmission family. This OEM genuine part directs pressurized hydraulic fluid from the valve block to the rotating clutch assemblies, ensuring consistent lubrication and cooling during high-torque operations. Located at the interface between the TRANSMISSION HOUSING and the rotating drum, the 4644.301.359 flange maintains critical oil flow paths. Without this part, the transmission cannot sustain proper hydraulic pressure for gear engagement. The SKU 4644.301.359 is manufactured to ZF’s original tolerances, guaranteeing a direct fit for service replacements.
Symptoms of Failure
- External oil seepage at the bell housing joint: A worn O-ring or cracked flange face allows ATF to escape, leaving puddles under the vehicle after shutdown.
- Delayed engagement or gear slipping under load: Insufficient oil delivery to the clutch packs causes hesitation when shifting from neutral to drive or reverse.
- Overheating transmission with burnt fluid smell: Reduced oil flow from a deformed feed flange leads to inadequate cooling, accelerating fluid degradation.
- Erratic shift quality with harsh upshifts: Fluctuating hydraulic pressure from a compromised flange results in unpredictable clutch apply rates.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4644.301.359 |
| Material | Die-cast aluminum alloy with nitrile O-ring |
| Weight | 0.42 kg (0.93 lbs) |
| OEM Reference | ZF 4644.301.359 |
| Bolt Hole Pattern | 6 x M8 on 85 mm PCD |
| Seal Diameter | 52 mm inner, 68 mm outer |
| Operating Pressure | 12-18 bar (174-261 psi) |
Compatibility
This oil feed flange is designed for ZF WG series transmissions, specifically the WG180, WG200, and WG210 models used in municipal buses, fire trucks, and heavy-duty construction vehicles. It also fits select ZF Ecomat 4HP and 5HP variants that share the same hydraulic circuit architecture. Always verify the serial number range on your transmission tag before ordering. For the WG200 series, this flange works with the DISCONNECTION assembly and the OUTPUT FLANGE to complete the oil circuit. Secure installation requires the HEXAGON SCREW set (M8 x 25 mm, grade 10.9) torqued to 35 Nm.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644105424 | DISCONNECTION | Isolates torque converter during PTO operation |
| 4644303538 | OUTPUT FLANGE | Transfers torque to driveshaft |
| 0636021036 | HEXAGON SCREW | Fastens flange to housing |
| 4644101224 | TRANSMISSION HOUSING | Main structural casing |
| 4644301346 | TRANSMISSION HOUSING | Alternate housing variant |
| 0730365067 | TYPE PLATE | Identification label |
| 4644106300 | SHIFT SYSTEM | Electronic shift control module |
| 4644306500 | COVER PLATE | Protects valve body access |
| 4644159311 | SHIFT SYSTEM | Pneumatic shift actuator |
| 4644306563 | VALVE BLOCK | Hydraulic pressure distribution |
