Overview
The ZF 4656.056.187 is a precision-engineered OEM genuine component specifically designed for the WG 160 Series transmission. This part functions as a critical internal guide and sealing element, ensuring proper oil flow and pressure regulation within the hydraulic control system. Positioned within the valve body assembly, the SKU 4656.056.187 directly influences shift quality and clutch engagement timing. Replacing this worn component restores factory-specified hydraulic performance and prevents cascading damage to adjacent assemblies such as the TRANSMISSION HOUSING and the HOUS.FRONT SECT.
Symptoms of Failure
- Delayed or harsh shifting: Worn sealing surfaces cause hydraulic pressure loss, leading to erratic gear engagement during acceleration or deceleration.
- Transmission fluid leaks near the valve body: Deterioration of the 4656.056.187 allows pressurized ATF to bypass seals, often pooling around the HOUSING REAR PART.
- Slipping in higher gears: Internal wear reduces clamping force on clutch packs, causing the transmission to lose torque under load.
- Intermittent neutral condition: The part’s failure to maintain circuit pressure can result in sudden loss of drive, particularly in WG160-equipped vehicles.
Technical Specifications
| Parameter | Specification |
|---|---|
| OEM Part Number | 4656.056.187 |
| Material | Hardened steel with nitrile sealing surface |
| Weight | 0.45 kg (1.0 lb) |
| Length | 85 mm |
| Width | 32 mm |
| Height | 22 mm |
| Operating Temperature Range | -40°C to +150°C |
| OEM Reference | ZF 4656.056.187 |
Compatibility
This genuine ZF part is primarily engineered for the WG 160 Series transmission, commonly found in medium-duty commercial vehicles and off-highway equipment. It is also compatible with the WG 180 and WG 200 series transmissions that share the same valve body architecture. When replacing this component, always inspect the HOUSING REAR SECTION for scoring or distortion that could compromise the new part’s seal integrity.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4656101056 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 4656201075 | HOUS.FRONT SECT | Front section housing pump and converter |
| 4656201077 | HOUSING REAR PART | Rear cover supporting output shaft |
| 4656298049 | HOUSING REAR SECTION | Intermediate rear housing section |
| 0631306816 | CYLINDRICAL PIN | Alignment dowel for housing assembly |
| 4656301148 | FIXING PLATE | Retains valve body components |
| 0636100817 | CAP SCREW | Fastener for housing sections |
| 4656301016 | SCREEN SHEET | Fine mesh filter for hydraulic fluid |
| 4656301017 | SCREEN SHEET | Secondary filter element |
| 0636100803 | CAP SCREW | Bolt for valve body retention |
Frequently Asked Questions
Q: Can the 4656.056.187 be reused after a transmission overhaul?
A: No. This is a single-use sealing component. Reusing it risks internal leakage and erratic shift patterns. Always install a new OEM genuine part during rebuilds.
Q: Does this part require special tools for installation?
A: Yes. A torque wrench calibrated to ZF specifications is necessary to avoid over-compressing the sealing surfaces. We recommend consulting the WG160 service manual for exact torque values.
Q: How does this part interact with the HOUSING REAR SECTION?
A: The 4656.056.187 seats directly against the HOUSING REAR SECTION to create a pressurized oil gallery. Any mismatch in surface flatness between these two parts will cause immediate hydraulic failure.
📞 Need this part? Contact our ZF specialists:
Email: info@partszf.com |
Phone: +86 158 2286 3467 |
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