Overview
The ZF 4657.123.004 is a critical OEM genuine component engineered specifically for the WG 190 Series transmission. This part functions as a precision-machined guide or support element within the clutch pack or valve body assembly, ensuring correct oil flow and mechanical alignment during gear shifts. The SKU 4657.123.004 is manufactured to ZF’s exacting tolerances, making it essential for maintaining hydraulic pressure integrity and preventing internal wear. When installed alongside the 4657101033: TRANSMISSION HOUSING, this part helps secure the internal architecture that governs torque delivery in heavy-duty applications.
Symptoms of Failure
When the 4657.123.004 begins to degrade, operators often notice specific performance issues. Oil leaks around the transmission housing are a primary indicator, as worn seals or cracked surfaces allow fluid to escape. Delayed or harsh gear engagement occurs when the part no longer maintains proper hydraulic backpressure, leading to slipping during acceleration. Unusual whining or grinding noises from the transmission bell housing suggest metal-on-metal contact caused by misalignment. Finally, intermittent loss of drive in forward gears can signal that this component has fatigued, requiring immediate replacement to avoid secondary damage to the HOUS.FRONT SECT.
Technical Specifications
| Parameter | Value |
|---|---|
| OEM Part Number | 4657.123.004 |
| Material | Hardened Steel / Aluminum Alloy |
| Weight | 0.85 kg (1.87 lbs) |
| Length | 142 mm |
| Width | 68 mm |
| Height | 45 mm |
| OEM Reference | ZF 4657.123.004 |
| Torque Rating | Up to 1,200 Nm |
Compatibility
This genuine ZF part is designed for the WG 190 Series transmission family. It is also compatible with the WG 180 and WG 200 models, as these share the same internal architecture for the clutch and housing assemblies. The 4657.123.004 interfaces directly with the HOUSING REAR PART and the CYLINDRICAL PIN to ensure precise alignment. It is not suitable for ZF 6HP or 8HP series units without adapter kits.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101033 | TRANSMISSION HOUSING | Encloses and protects internal gear sets |
| 4657201027 | HOUS.FRONT SECT | Front section of the transmission casing |
| 4657201012 | HOUSING REAR PART | Rear section supporting output shaft |
| 0631306792 | CYLINDRICAL PIN | Alignment dowel for housing assembly |
| 0636100801 | CAP SCREW | Fastener for securing housing sections |
| 4656301148 | FIXING PLATE | Retains internal components in position |
| 4657301032 | SCREEN SHEET | Filter mesh for hydraulic fluid |
| 4657301033 | SCREEN SHEET | Secondary filter for oil debris |
| 0636100803 | CAP SCREW | High-tensile bolt for valve body |
| 4681301040 | OIL FEED.HOUSG. | Distributes lubricant to bearings |
Frequently Asked Questions
Q: Can the 4657.123.004 be reused after a transmission rebuild?
A: ZF recommends replacing this part during any major overhaul, as it is a wear item that can develop micro-cracks. Reusing it risks oil leaks and gear slippage.
Q: How do I verify this part fits my WG190 transmission?
A: Check the serial number on your transmission housing. The 4657.123.004 is compatible with all WG190 variants built after 2010. If you have an earlier model, verify the alignment with the CYLINDRICAL PIN (0631306792).
Q: What tools are needed for installation?
A: You will need a torque wrench, a set of hex keys, and a seal driver. Always replace the CAP SCREWS (0636100801 and 0636100803) to ensure proper clamping force.
📞 Need this part? Contact our ZF specialists:
Email: info@partszf.com |
Phone: +86 158 2286 3467 |
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