Overview
The ZF 4651.231.004 is a critical OEM genuine component engineered specifically for the WG100 and WG110 transmission series. This precision-machined part functions as a hydraulic control element within the valve body assembly, regulating oil flow to ensure smooth gear engagement and consistent clutch pack pressure. The SKU 4651.231.004 is manufactured to ZF’s exacting tolerances, making it a direct replacement for worn units in heavy-duty commercial and off-highway applications. When installed alongside the 4651101007: TRANSMISSION HOUSING, it restores proper hydraulic circuit integrity.
Symptoms of Failure
- Erratic shifting or gear hunting — When the 4651.231.004 wears, internal leakage causes delayed or harsh shifts, particularly under load. This is a common “ZF transmission shifting problems” query.
- Low hydraulic pressure warnings — A worn part reduces system pressure, triggering dashboard alerts. This symptom often appears alongside “WG100 transmission pressure loss” searches.
- Oil seepage around the valve body — Degraded sealing surfaces allow ATF to escape. Combined with a failing 0634303928: O-RING, this leads to visible drips and low fluid levels.
- Torque converter lockup failure — Insufficient control pressure prevents proper converter clutch engagement, causing overheating and fuel economy loss.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4651.231.004 |
| Material | Hardened steel with corrosion-resistant coating |
| Weight | 0.85 kg (1.87 lbs) |
| Dimensions | 120 mm x 45 mm x 30 mm |
| OEM Reference | ZF 4651.231.004 (Genuine) |
| Sealing Surface Finish | Ra 0.4 µm |
| Operating Temperature Range | -40°C to +120°C |
Compatibility
This part is designed for ZF WG series transmissions, specifically the WG100 and WG110 models. It is also compatible with WG180, WG200, and WG210 variants that share the same valve body architecture. The 4651.231.004 interfaces directly with the 4651301029: HOUSING and the 4651301024: HOUSING to form a sealed hydraulic circuit. Always verify your transmission’s serial number before ordering.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4651101007 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 4651301029 | HOUSING | Intermediate hydraulic manifold |
| 0634303928 | O-RING | Seals fluid passages between components |
| 4651301024 | HOUSING | Lower valve body support |
| 4651203002 | SCREEN SHEET | Filters debris from hydraulic oil |
| 4651303005 | SCREEN SHEET | Secondary filtration element |
| 0636101032 | CAP SCREW | Fastens housing sections together |
| 0630361028 | SEALING CAP | Closes unused hydraulic ports |
| 4475280060 | SCREW PLUG | Seals threaded access holes |
| 0634303312 | O-RING | Provides secondary sealing for plugs |
Frequently Asked Questions
Q: How do I know if the 4651.231.004 is failing?
A: Look for delayed engagement when shifting from Neutral to Drive, or erratic upshifts under moderate throttle. A pressure gauge reading below 150 psi at idle often confirms internal wear.
Q: Can I replace this part without removing the transmission?
A: Yes, in most WG100/WG110 installations the valve body is accessible after draining the fluid and removing the oil pan. However, you must replace all 0634303928: O-RING seals during reassembly to prevent leaks.
Q: Is this part interchangeable between WG100 and WG180 models?
A: The 4651.231.004 is physically identical across WG100, WG110, and WG180 transmissions, but always cross-reference your housing casting number with the 4651301024: HOUSING compatibility chart to ensure correct fitment.
📞 Need this part? Contact our ZF specialists:
Email: info@partszf.com |
Phone: +86 158 2286 3467 |
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