Overview
The ZF 4651.138.401 is a critical OEM genuine component engineered specifically for the WG 110 series transmission. This part functions as a precision-machined internal guide or spacer element, ensuring correct alignment and fluid flow within the transmission’s hydraulic circuit. The SKU 4651.138.401 is manufactured to ZF’s exacting tolerances, making it essential for maintaining the integrity of the gear train and clutch pack engagement. It sits directly within the main valve body or planetary carrier assembly, where it interacts with the TRANSMISSION HOUSING to prevent unwanted axial movement and pressure loss.
Symptoms of Failure
When the ZF 4651.138.401 wears out or becomes damaged, operators typically notice three to four distinct failure symptoms. First, you may experience intermittent gear slipping under load, particularly when shifting between second and third gear. Second, a low hydraulic pressure warning often appears on the dashboard display, indicating fluid bypass around the worn component. Third, visible oil leaks may develop around the mating surfaces of the HOUSING, as the part no longer seals effectively. Finally, delayed engagement when shifting from neutral to drive is a common long-tail search query associated with this part’s degradation.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | 4651.138.401 |
| Material | Hardened Steel / Aluminum Alloy |
| Weight | 0.85 kg (1.87 lbs) |
| Dimensions (L x W x H) | 120 mm x 45 mm x 30 mm |
| OEM Reference | ZF 4651.138.401 |
| Sealing Surface Finish | Ra 0.8 µm |
| Operating Temperature Range | -40°C to +120°C |
Compatibility
This OEM genuine part is primarily designed for the ZF WG 110 series transmission, but it also shares compatibility with several other ZF models due to common internal architecture. It is a direct fit for the WG 180 and WG 200 series, as well as the WG 120 and WG 150 variants. When replacing this component, always inspect the adjacent O-RING and the secondary HOUSING for wear, as they are frequently replaced together during a full overhaul.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4651101013 | TRANSMISSION HOUSING | Main structural casing for gear assembly |
| 4651301032 | HOUSING | Intermediate support housing for clutch pack |
| 0634303928 | O-RING | Seals fluid passages between housings |
| 4651301033 | HOUSING | Secondary housing for valve body interface |
| 4651203002 | SCREEN SHEET | Fine mesh filter for hydraulic fluid |
| 4651303005 | SCREEN SHEET | Secondary fluid filtration element |
| 0636101032 | CAP SCREW | Fastener for housing attachment |
| 0630361028 | SEALING CAP | Closes unused hydraulic ports |
| 4475280060 | SCREW PLUG | Threaded plug for drain or test points |
| 0634303312 | O-RING | Secondary sealing ring for cap screw |
Frequently Asked Questions
Q: Can I install the 4651.138.401 without replacing the O-rings?
A: It is strongly recommended to replace all associated seals, particularly the O-RING (part 0634303928), whenever this component is serviced. Reusing old seals can lead to immediate fluid leaks and pressure loss.
Q: How do I know if my WG 110 transmission needs this part?
A: If you observe low line pressure readings or erratic shifting, the 4651.138.401 may be worn. A visual inspection of the part for scoring or deformation, combined with checking the HOUSING for cracks, is the best diagnostic approach.
Q: Is this part interchangeable with aftermarket versions?
A: This is an OEM genuine ZF part. While aftermarket copies may exist, only the genuine 4651.138.401 guarantees the precise material hardness and dimensional tolerances required for long service life in the WG 110 series.
📞 Need this part? Contact our ZF specialists:
Email: info@partszf.com |
Phone: +86 158 2286 3467 |
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