Overview
The ZF 5838.300.461 OIL FILLING is a critical OEM genuine component designed to facilitate precise lubricant introduction into ZF heavy-duty transmissions used in construction machinery. This part serves as the primary access point for transmission fluid, ensuring that internal gears, bearings, and hydraulic systems receive the correct oil volume during assembly or maintenance. Positioned on the upper housing of the transmission case, the 5838.300.461 oil filling port integrates seamlessly with the drivetrain assembly, working in conjunction with the 5838022003: REAR AXLE and 5838109001: DIFFERENTIAL to maintain optimal lubrication flow. This SKU is engineered to ZF’s exacting tolerances, preventing contamination and ensuring leak-free operation under extreme loads.
Symptoms of Failure
- Transmission fluid seepage around the fill cap: A worn or cracked 5838.300.461 oil filling port often causes visible oil drips on the transmission housing, leading to low fluid levels and potential gear damage.
- Difficulty engaging gears or erratic shifting: When this part fails to seal properly, air ingress disrupts hydraulic pressure, resulting in slipping clutches or delayed engagement—common in WG180 and WG200 series transmissions.
- Contaminated transmission oil: A compromised oil filling assembly allows dirt and moisture to enter the system, accelerating wear on the 0750117075: TAPER ROLLER BEARING and other precision components.
- Overheating during heavy operation: Insufficient oil volume from a leaking fill port reduces cooling capacity, causing thermal stress on the 5838300128: DIFFERENTIAL HOUSING and internal gears.
Technical Specifications
| Specification | Detail |
|---|---|
| Part Number | 5838.300.461 |
| Material | High-grade aluminum alloy with corrosion-resistant coating |
| Dimensions | 85 mm (L) x 45 mm (W) x 30 mm (H) |
| Weight | 0.18 kg (0.4 lbs) |
| OEM Reference | ZF 5838.300.461 |
| Thread Type | M22 x 1.5 metric fine thread |
| Seal Type | Integrated O-ring (Nitrile rubber) |
Compatibility
This OEM genuine oil filling part is engineered for ZF’s WG series transmissions commonly deployed in construction machinery such as wheel loaders, excavators, and graders. It is directly compatible with the following ZF transmission models: WG180, WG200, WG210, and WG250. Additionally, it fits select variants of the Ecomat 4HP and 6HP series used in heavy equipment. Always verify your transmission serial number to ensure proper fitment, as the 5838.300.461 is designed for top-mounted fill ports on units paired with the 5838022003: REAR AXLE and 5838109001: DIFFERENTIAL assemblies.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 5838022003 | REAR AXLE | Transfers torque from differential to wheels |
| 5838109001 | DIFFERENTIAL | Distributes power between left/right wheels |
| 0750117075 | TAPER ROLLER BEARING | Supports axial and radial loads in gear sets |
| 5838300128 | DIFFERENTIAL HOUSING | Encloses differential gears and bearings |
| 0631329086 | SPRING PIN | Secures alignment of transmission components |
| 5838300129 | THRUST WASHER | Reduces friction between rotating parts |
| 5838300130 | THRUST WASHER | Controls axial clearance in differential |
| 5838300131 | AXLE BEVEL GEAR | Changes torque direction in final drive |
| 5838300132 | COMPENS. STUB AXLE | Supports wheel hub and bearing assembly |
| 5838300133 | COMPENS. STUB AXLE | Balances load distribution on axle ends |
