Overview
This genuine OEM ZF 4656.056.026 component is a critical internal sealing and alignment element designed specifically for the WG 160 series transmission. Positioned within the main gear train assembly, this part ensures precise hydraulic pressure distribution and prevents cross-contamination between lubrication circuits. The SKU 4656.056.026 interfaces directly with the TRANSMISSION HOUSING to maintain structural integrity under high-torque conditions. As an OEM genuine part, it guarantees factory-specified tolerances for long service intervals in heavy-duty commercial applications.
Symptoms of Failure
- Delayed gear engagement or slipping: When the 4656.056.026 wears, hydraulic pressure drops, causing hesitation when shifting from neutral to drive or reverse.
- External oil seepage near the bell housing: A worn seal surface allows transmission fluid to escape, often mistaken for a main shaft leak.
- Erratic shift quality under load: Intermittent hard shifts or flaring between gears indicate inconsistent fluid routing through this component.
- Contaminated transmission fluid: Debris from a degraded 4656.056.026 can circulate, accelerating wear on the HOUS.FRONT SECT and valve body.
Technical Specifications
| Parameter | Value |
|---|---|
| OEM Part Number | 4656.056.026 |
| Material | Hardened alloy steel with nitrile coating |
| Outer Diameter | 68.5 mm |
| Inner Diameter | 42.0 mm |
| Height / Thickness | 14.2 mm |
| Weight | 0.185 kg |
| OEM Reference | ZF 4656.056.026 (Genuine) |
| Operating Temperature Range | -40°C to +120°C |
Compatibility
This part is engineered for the ZF WG 160 series transmission family. It is also compatible with the WG 180 and WG 200 variants when used in conjunction with the correct HOUSING REAR PART and HOUSING REAR PART assemblies. Always verify the transmission serial number against ZF’s application guide before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4656101037 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 4656201075 | HOUS.FRONT SECT | Front section housing for input shaft |
| 4656201035 | HOUSING REAR PART | Rear housing section for output assembly |
| 4472239178 | HOUSING REAR PART | Alternate rear housing variant for WG160 |
| 0631306816 | CYLINDRICAL PIN | Alignment dowel for housing mating surfaces |
| 4656301148 | FIXING PLATE | Retains internal components in position |
| 0636100817 | CAP SCREW | Fastener for housing attachment |
| 4656301016 | SCREEN SHEET | Fine mesh filter for hydraulic circuit |
| 4656301017 | SCREEN SHEET | Alternative mesh filter specification |
| 0636100803 | CAP SCREW | Secondary fastener for cover plates |
Frequently Asked Questions
Q: Can the 4656.056.026 be reused after a transmission overhaul?
A: No. This is a single-use component due to its compression sealing design. Always replace it with a new OEM genuine part during any WG160 rebuild to prevent premature fluid leaks.
Q: What tools are required to install this part?
A: You will need a bearing press or hydraulic arbor press, along with a seal installation driver set. Never use a hammer directly on the component as it can distort the sealing lip.
Q: How does this part differ from the 4656.056.025 variant?
A: The 4656.056.026 features an updated nitrile coating compound for improved resistance to synthetic transmission fluids, whereas the .025 variant uses a standard rubber compound. Always check your transmission’s fluid specification before ordering.
📞 Need this part? Contact our ZF specialists:
Email: info@partszf.com |
Phone: +86 158 2286 3467 |
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