Overview
The ZF 4656.056.151 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 gearbox assembly, ensuring proper oil flow and preventing contamination between housing sections. The SKU 4656.056.151 is manufactured to ZF’s exacting tolerances, making it a direct replacement for worn units in heavy-duty commercial vehicle transmissions. It sits between the main housing and the front section, acting as a barrier that maintains hydraulic pressure and protects internal gears from debris ingress.
Symptoms of Failure
- Oil leaks at the housing joint: When the 4656.056.151 deteriorates, transmission fluid seeps from the seam between the TRANSMISSION HOUSING and the front section, leaving visible puddles under the vehicle.
- Gear slipping under load: A worn part causes pressure loss, leading to delayed engagement or slipping during acceleration, especially in higher gears.
- Contaminated transmission fluid: Failure allows dirt and metal particles to bypass the seal, resulting in gritty or discolored oil on the dipstick.
- Unusual whining or grinding noises: Insufficient sealing leads to cavitation and metal-on-metal contact, producing audible sounds from the transmission housing.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number (SKU) | 4656.056.151 |
| Material | Reinforced nitrile rubber with steel insert |
| Outer Diameter | 142 mm |
| Inner Diameter | 98 mm |
| Thickness | 12 mm |
| Weight | 0.34 kg |
| OEM Reference | ZF 4656.056.151 |
| Operating Temperature Range | -40°C to +120°C |
Compatibility
This genuine ZF part is primarily engineered for the WG 160 Series transmission, but it also fits select models in the WG180 and WG200 families due to shared housing architecture. It is commonly used in ZF 6WG160, 6WG180, and 6WG200 gearboxes found in municipal buses, fire trucks, and heavy construction vehicles. Always verify your transmission serial number before ordering. The part interfaces directly with the HOUS.FRONT SECT, the HOUSING REAR PART, and the HOUSING REAR SECTION to create a complete sealed assembly.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4656101057 | TRANSMISSION HOUSING | Main structural casing that encloses all gear sets |
| 4656201075 | HOUS.FRONT SECT | Front housing section that supports the torque converter |
| 4656201078 | HOUSING REAR PART | Rear housing segment that houses the output shaft |
| 4656298050 | HOUSING REAR SECTION | Additional rear cover for extended gearbox configurations |
| 0631306816 | CYLINDRICAL PIN | Alignment dowel for precise housing positioning |
| 4656301148 | FIXING PLATE | Secures the seal in place against axial movement |
| 0636100817 | CAP SCREW | M10 fastener for mounting the fixing plate |
| 4656301016 | SCREEN SHEET | Fine mesh filter for oil return line protection |
| 4656301017 | SCREEN SHEET | Coarse mesh filter for main sump debris capture |
| 0636100803 | CAP SCREW | M8 fastener for screen sheet retention |
Frequently Asked Questions
Q: Can the 4656.056.151 be reused after a transmission overhaul?
A: No. ZF recommends replacing this seal with a new OEM genuine part during any major rebuild. The nitrile material compresses permanently over time, and reusing it risks immediate oil leaks and pressure loss.
Q: How do I know if this part fits my WG160 transmission?
A: Check the stamped serial number on the transmission data plate. The 4656.056.151 is compatible with all WG160 variants produced after 2005, including the 6WG160 and 6WG160-2 models. For earlier units, measure the housing bore diameter to confirm.
Q: What tools are needed to replace this component?
A: You will need a seal driver kit, torque wrench, and a set of hex sockets. The CYLINDRICAL PIN and FIXING PLATE must be removed first, followed by careful prying of the old seal without scratching the housing bore.
📞 Need this part? Contact our ZF specialists:
Email: info@partszf.com |
Phone: +86 158 2286 3467 |
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