ZF 4656.055.003 for WG160 | OEM Genuine Part

Overview

The ZF 4656.055.003 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 gear train assembly, ensuring proper oil flow and pressure regulation between the main housing and the rotating clutch packs. As an original ZF part, the SKU 4656.055.003 guarantees exact fitment and metallurgical consistency required for heavy-duty industrial applications. It sits directly between the TRANSMISSION HOUSING and the HOUS.FRONT SECT, acting as a wear-resistant interface that absorbs torsional vibration while maintaining hydraulic integrity.

Symptoms of Failure

• Oil leaks at the bell housing seam: When the 4656.055.003 degrades, pressurized transmission fluid seeps past the sealing surface, leaving visible drips under the vehicle. This is a common long-tail search query for “ZF WG160 oil leak between housing sections.”
• Intermittent gear slipping under load: A worn part disrupts hydraulic pressure to the clutch packs, causing hesitation or slipping when the transmission shifts from 2nd to 3rd gear under heavy torque.
• Metallic grinding noise during cold starts: As the component loses its dimensional stability, metal-on-metal contact occurs between the HOUSING REAR PART and the rotating drum, producing a distinct grinding sound until the transmission warms up.
• Erratic shift timing: The part’s failure alters fluid flow dynamics, causing delayed or harsh engagements that are often misdiagnosed as solenoid issues.

Technical Specifications

Compatibility

This genuine ZF part is engineered for the WG 160 Series transmission family. It is also compatible with the WG 180 and WG 200 models when used in conjunction with the HOUSING REAR PART (part number 4472239180). The 4656.055.003 is not suitable for older WG 120 or WG 150 units without modification. Always verify your transmission’s serial number against ZF’s OEM catalog before ordering.

Related Components

Frequently Asked Questions

Q: Can the 4656.055.003 be replaced without removing the entire transmission?
A: Yes, in most WG160 applications, this part is accessible after removing the bell housing and the HOUS.FRONT SECT. However, you must support the transmission on a jack to avoid damaging the input shaft.

Q: How do I verify that the 4656.055.003 is the correct part for my WG160?
A: Check the stamped serial number on the transmission data plate. The WG160 typically uses this part when the serial number prefix is “WG160-xxxxx.” Cross-reference with the TRANSMISSION HOUSING casting number for absolute confirmation.

Q: What is the typical service life of this OEM part?
A: Under normal operating conditions with proper fluid maintenance, the 4656.055.003 lasts approximately 500,000 to 700,000 kilometers. Premature failure often occurs due to contaminated oil or over-torqued housing bolts.