Overview
The ZF 4656.055.115 is a precision-engineered OEM genuine component specifically designed for the WG 160 Series transmission. This critical part functions as a sealing and alignment interface within the transmission’s hydraulic control circuit, ensuring consistent oil pressure regulation and smooth gear engagement. Located in the valve body assembly, the SKU 4656.055.115 directly influences shift quality and torque converter lock-up performance. As a factory-spec replacement, it restores the transmission’s original operating tolerances and prevents premature wear of adjacent assemblies such as the 4656101056: TRANSMISSION HOUSING and the 4656201075: HOUS.FRONT SECT.
Symptoms of Failure
When the 4656.055.115 begins to degrade, operators typically notice three distinct failure modes. First, delayed or harsh upshifts occur as hydraulic pressure bleeds past the worn sealing surface, causing erratic clutch pack engagement. Second, intermittent gear slipping under load becomes apparent, particularly when towing or climbing grades, as the part fails to maintain line pressure. Third, external oil seepage around the valve body mating area signals that the component’s sealing lip has hardened or cracked. Finally, erratic torque converter lock-up may trigger diagnostic trouble codes, often misdiagnosed as solenoid failure.
Technical Specifications
| Specification | Detail |
|---|---|
| OEM Part Number | 4656.055.115 |
| Material | Hardened alloy steel with nitrile rubber seal |
| Weight | 0.42 kg (0.93 lbs) |
| Outer Diameter | 48.5 mm |
| Inner Diameter | 22.0 mm |
| Height | 18.2 mm |
| OEM Reference | ZF 4656.055.115 (Genuine) |
| Torque Rating | Up to 1,200 Nm |
Compatibility
This part is engineered for the ZF WG 160 Series, but it also cross-fits select models in the WG 180 and WG 200 families due to shared valve body architecture. It is a direct replacement for transmissions used in municipal buses, fire trucks, and heavy-duty vocational trucks. For proper installation, always verify the condition of the 4656201077: HOUSING REAR PART and the 4656298049: HOUSING REAR SECTION, as these mating surfaces directly affect sealing integrity.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4656101056 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 4656201075 | HOUS.FRONT SECT | Front section housing torque converter |
| 4656201077 | HOUSING REAR PART | Rear housing for output shaft support |
| 4656298049 | HOUSING REAR SECTION | Lower rear section for oil pan sealing |
| 0631306816 | CYLINDRICAL PIN | Alignment dowel for housing assembly |
| 4656301148 | FIXING PLATE | Retains valve body components |
| 0636100817 | CAP SCREW | M10 fastening bolt for housing |
| 4656301016 | SCREEN SHEET | Fine mesh filter for oil circuit |
| 4656301017 | SCREEN SHEET | Coarse mesh pre-filter for sump |
| 0636100803 | CAP SCREW | M8 fastening bolt for valve body |
Frequently Asked Questions
Q: Can the 4656.055.115 be reused after a transmission overhaul?
A: No. This is a single-use sealing component. Reusing it risks internal pressure loss and erratic shifting. Always install a new OEM genuine part during rebuilds.
Q: How do I confirm this part fits my WG 160 transmission?
A: Verify the transmission serial number and compare the valve body casting code. The 4656.055.115 is standard on WG 160 models built after 2012, but it also retrofits earlier units when paired with updated housing sections.
Q: What tools are required for replacement?
A: A torque wrench (10–25 Nm range), a seal driver set, and a pick tool for removing the old seal. Always replace the 0631306816: CYLINDRICAL PIN if it shows wear during disassembly.
📞 Need this part? Contact our ZF specialists:
Email: info@partszf.com |
Phone: +86 158 2286 3467 |
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