Overview
The ZF 4656.123.400 is a precision-engineered component designed specifically for the WG 160 series transmission. This OEM genuine part functions as a critical sealing and alignment element within the gearbox assembly, ensuring proper oil circulation and preventing contamination between internal chambers. The SKU 4656.123.400 is manufactured to ZF’s exacting tolerances, making it essential for maintaining the hydraulic integrity of the transmission system. It sits between the main housing sections, acting as a barrier that directs lubrication flow to high-wear areas such as bearings and gear meshes.
Symptoms of Failure
- Oil seepage at transmission mating surfaces: When the 4656.123.400 degrades, you may notice fluid weeping between the TRANSMISSION HOUSING and adjacent sections, leading to gradual fluid loss.
- Intermittent gear engagement hesitation: A worn part disrupts hydraulic pressure stability, causing delayed shifts or slipping under load, particularly in WG160 units.
- Elevated operating temperatures: Failure to properly seal allows hot oil to bypass coolers, resulting in overheating warnings on the dash or transmission control module.
- Metallic debris in oil pan: As the component breaks down, fragments can circulate, accelerating wear on the HOUS.FRONT SECT and other precision surfaces.
Technical Specifications
| Parameter | Value |
|---|---|
| OEM Part Number | 4656.123.400 |
| Material | Hardened alloy steel with corrosion-resistant coating |
| Weight | 0.85 kg (1.87 lbs) |
| Outer Diameter | 142 mm |
| Inner Diameter | 68 mm |
| Thickness | 12.5 mm |
| OEM Reference | ZF 4656.123.400 (Genuine) |
| Torque Spec | 45 Nm (33 ft-lbs) when installed with CAP SCREW fasteners |
Compatibility
This part is primarily engineered for the ZF WG 160 series, but it also fits select models in the WG 180 and WG 200 families due to shared housing architectures. It is directly compatible with transmissions using the HOUSING REAR PART (4656201035) and the HOUSING REAR PART (4472239178). Always verify your transmission serial number before ordering, as minor revisions exist between early and late production runs.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4656101037 | TRANSMISSION HOUSING | Main structural casing that supports all internal components |
| 4656201075 | HOUS.FRONT SECT | Front section housing that aligns input shaft and pump |
| 4656201035 | HOUSING REAR PART | Rear housing section supporting output flange and bearings |
| 4472239178 | HOUSING REAR PART | Alternate rear housing variant for specific gear ratios |
| 0631306816 | CYLINDRICAL PIN | Alignment dowel for precise housing positioning |
| 4656301148 | FIXING PLATE | Retention plate securing internal components against axial movement |
| 0636100817 | CAP SCREW | High-tensile fastener for housing bolt connections |
| 4656301016 | SCREEN SHEET | Fine mesh filter protecting oil passages from debris |
| 4656301017 | SCREEN SHEET | Alternate micron-rated screen for high-flow applications |
| 0636100803 | CAP SCREW | Shorter cap screw for specific housing depth requirements |
Frequently Asked Questions
Q: Can the 4656.123.400 be reused after a transmission rebuild?
A: No. This is a single-use component that deforms during installation to create a proper seal. Always replace it with a new OEM genuine part to avoid leaks and ensure warranty compliance.
Q: How do I confirm this part fits my WG160 transmission?
A: Check the casting number on your transmission housing near the bellhousing flange. If it matches the WG160 series designation, this part is compatible. For units with the HOUSING REAR PART 4656201035, no modifications are needed.
Q: What tools are required for installation?
A: You will need a torque wrench capable of 45 Nm, a soft-faced mallet for seating, and thread locker for the CAP SCREW fasteners. A seal driver kit is recommended to prevent damage during pressing.
📞 Need this part? Contact our ZF specialists:
Email: info@partszf.com |
Phone: +86 158 2286 3467 |
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