Overview
The ZF 4656.056.029 is a precision-engineered OEM genuine component designed specifically for the WG 160 Series transmission. This part functions as a critical sealing and alignment element within the hydraulic control system, ensuring proper oil flow regulation and pressure maintenance during gear shifts. Located in the valve body assembly, the SKU 4656.056.029 interfaces directly with the main housing to prevent cross-contamination between hydraulic circuits. When installed correctly, it guarantees consistent clutch engagement and smooth power delivery under heavy-duty industrial applications.
Symptoms of Failure
- Erratic gear engagement: Worn seals cause delayed or harsh shifting, particularly when transitioning between forward and reverse gears.
- Hydraulic fluid seepage: Visible oil drips around the transmission housing near the valve body indicate degraded sealing integrity of part 4656.056.029.
- Intermittent pressure loss: Operators may notice reduced torque converter lockup or slipping under load, especially during low-speed maneuvering.
- Contaminated transmission fluid: Internal leakage allows debris to bypass filtration, leading to accelerated wear of adjacent components like the TRANSMISSION HOUSING.
Technical Specifications
| Parameter | Value |
|---|---|
| OEM Part Number | 4656.056.029 |
| Material Composition | Hardened steel with nitrile rubber seal |
| Outer Diameter | 42.5 mm |
| Inner Diameter | 28.0 mm |
| Height | 18.3 mm |
| Weight | 0.12 kg |
| Operating Temperature Range | -40°C to +120°C |
| OEM Reference | ZF 4656.056.029 |
Compatibility
This genuine ZF part is primarily engineered for the WG 160 Series transmission, but it also cross-fits select models in the WG180 and WG200 families. It is a direct replacement for units manufactured between 2012 and 2022. For proper installation, ensure the HOUS.FRONT SECT and HOUSING REAR PART are free from scoring or warpage. The 4656.056.029 also pairs with the HOUSING REAR PART (4472239178) in later production runs. Always verify serial numbers before ordering.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4656101037 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 4656201075 | HOUS.FRONT SECT | Front section housing torque converter |
| 4656201035 | HOUSING REAR PART | Rear housing for output shaft support |
| 4472239178 | HOUSING REAR PART | Alternate rear housing variant |
| 0631306816 | CYLINDRICAL PIN | Alignment dowel for housing mating |
| 4656301148 | FIXING PLATE | Retains valve body components |
| 0636100817 | CAP SCREW | M8 fastener for housing assembly |
| 4656301016 | SCREEN SHEET | Fine mesh filter for hydraulic fluid |
| 4656301017 | SCREEN SHEET | Coarse mesh pre-filter |
| 0636100803 | CAP SCREW | M6 fastener for valve body cover |
Frequently Asked Questions
Q: Can I use this part in a WG180 transmission?
A: Yes, the 4656.056.029 is compatible with WG180 models produced after 2015, provided the housing mating surfaces are clean. Always cross-reference with your transmission serial number.
Q: What tools are required for replacement?
A: You will need a torque wrench (set to 25 Nm), a seal puller, and a soft-faced mallet. Ensure the HOUS.FRONT SECT is properly aligned before tightening.
Q: How often should this part be inspected?
A: During every major transmission overhaul (typically every 5000 operating hours) or if you observe any of the failure symptoms listed above.
📞 Need this part? Contact our ZF specialists:
Email: info@partszf.com |
Phone: +86 158 2286 3467 |
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