Overview
This OEM genuine ZF part, the 4656.183.021, is a critical component designed specifically for the WG 160 Series transmission. It functions as a precision-engineered sealing and alignment element within the rear section of the gearbox assembly. The 4656.183.021 ensures proper oil flow regulation and maintains structural integrity between the main housing and the output shaft area. When installed correctly, this part prevents contamination ingress and maintains the hydraulic pressure necessary for smooth gear engagement. It is often replaced in conjunction with the 4656101037: TRANSMISSION HOUSING to guarantee a complete seal restoration.
Symptoms of Failure
When the 4656.183.021 begins to degrade, operators will notice distinct performance issues. Look for these specific failure indicators:
- Oil seepage at the rear bell housing: A slow, persistent drip of transmission fluid near the output flange indicates the seal has hardened or cracked.
- Erratic gear engagement under load: The transmission may hesitate or slip when climbing grades or towing heavy loads due to pressure loss.
- Metallic whining noise from the transmission center: Worn tolerances allow metal-on-metal contact, producing a high-pitched sound during acceleration.
- Visible scoring on the shaft surface: Upon disassembly, grooves or heat discoloration on the mating shaft confirm the part has failed catastrophically.
Technical Specifications
| Parameter | Specification |
|---|---|
| OEM Part Number | 4656.183.021 |
| Material | Hardened Steel / Nitrile Rubber Composite |
| Outer Diameter | 85.0 mm |
| Inner Diameter | 62.0 mm |
| Height / Thickness | 12.5 mm |
| Weight | 0.18 kg |
| Operating Temperature Range | -40°C to +150°C |
| OEM Reference | ZF 4656.183.021 (Genuine) |
Compatibility
This genuine ZF 4656.183.021 component is primarily engineered for the WG 160 Series transmission. It is also compatible with the following ZF models where the rear housing configuration matches: WG 180, WG 200, and select variants of the WG 150 series. For proper fitment, always verify the housing interface. This part is frequently paired with the 4656201075: HOUS.FRONT SECT and the 4656201035: HOUSING REAR PART to complete a full rear-section overhaul. In some applications, the 4472239178: HOUSING REAR PART is used as an alternative, depending on the generation of the transmission.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4656101037 | TRANSMISSION HOUSING | Main structural casing for gear assembly |
| 4656201075 | HOUS.FRONT SECT | Front section housing for input shaft support |
| 4656201035 | HOUSING REAR PART | Rear housing section for output bearing retention |
| 4472239178 | HOUSING REAR PART | Alternate rear housing for specific WG variants |
| 0631306816 | CYLINDRICAL PIN | Alignment dowel for housing mating surfaces |
| 4656301148 | FIXING PLATE | Secures internal components against axial movement |
| 0636100817 | CAP SCREW | Fastener for housing-to-housing connections |
| 4656301016 | SCREEN SHEET | Filter mesh for oil debris protection |
| 4656301017 | SCREEN SHEET | Alternate filter mesh for high-flow applications |
| 0636100803 | CAP SCREW | Fastener for cover plate attachment |
Frequently Asked Questions
Q: How do I know if the 4656.183.021 is the correct part for my WG160 transmission?
A: Verify the stamped part number on the original component. The 4656.183.021 is a direct OEM replacement for WG160 models produced after 2012. Cross-reference your transmission serial number with the ZF parts catalog to confirm compatibility.
Q: Can I replace this part without removing the entire transmission?
A: In most cases, partial disassembly of the rear housing is required. You will need to remove the output flange and the 4656201035: HOUSING REAR PART to access the 4656.183.021. A full transmission removal is not always necessary, but access to a lift is recommended.
Q: What other seals should I replace at the same time?
A: It is best practice to replace the 0631306816: CYLINDRICAL PIN and all associated 0636100817: CAP SCREW fasteners to ensure a leak-free assembly.
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Phone: +86 158 2286 3467 |
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