ZF 4657.304.038 DISC CARRIER for WG190/WG210 | OEM Genuine Part

Overview

The ZF 4657.304.038 DISC CARRIER is a critical internal component engineered specifically for the WG190 and WG210 series transmissions. This OEM genuine part functions as the central hub that houses and aligns the clutch disc packs, ensuring precise torque transfer and smooth gear engagement under heavy-duty industrial loads. Positioned within the main gear train assembly, the disc carrier interfaces directly with the TRANSMISSION HOUSING and the HOUS.FRONT SECT to maintain structural integrity during operation. The SKU 4657.304.038 is manufactured to ZF’s original tolerances, guaranteeing a direct fit and long service life in demanding construction, mining, and agricultural machinery.

Symptoms of Failure

• Erratic gear engagement or slipping under load: When the disc carrier wears, clutch packs lose proper alignment, causing delayed or incomplete gear shifts, especially during uphill or heavy-load operation.
• Metallic grinding or rattling noises from the transmission: Worn carrier splines or bearing surfaces produce audible metal-on-metal contact, often mistaken for bearing failure.
• Oil contamination with metallic debris: As the carrier degrades, fine steel particles enter the hydraulic circuit, leading to clogged filters and accelerated wear of the HOUSING REAR SECTION.
• Intermittent loss of drive in forward or reverse: A cracked or warped disc carrier can cause complete torque interruption, often misdiagnosed as a pump or valve issue.

Technical Specifications

Compatibility

This disc carrier is designed for ZF WG-series powershift transmissions. It is a direct replacement for models in the WG190 and WG210 series, commonly found in ZF 4WG-190, 4WG-210, and 5WG-210 variants. While primarily intended for these two series, the 4657.304.038 may also be used in select WG180 and WG200 configurations where the clutch pack geometry matches. Always verify the spline count and carrier thickness against your existing part. The carrier works in conjunction with the HOUSING REAR PART and the HOUSING REAR SECTION to complete the rear clutch assembly.

Related Components

Frequently Asked Questions

Q: Can the 4657.304.038 disc carrier be used in a ZF WG180 transmission?
A: While the WG180 shares some clutch pack dimensions, we recommend measuring the spline count and carrier thickness. The 4657.304.038 is officially validated for WG190 and WG210 series only. Using it in a WG180 may require verifying compatibility with the HOUS.FRONT SECT clearance.

Q: What are the torque specifications for the cap screws securing this disc carrier?
A: ZF specifies 85 Nm (63 ft-lbs) for the CAP SCREW (0636100801) and 110 Nm (81 ft-lbs) for the CAP SCREW (0636100803). Always use a new FIXING PLATE to prevent loosening.

Q: How can I tell if my disc carrier is worn without disassembling the transmission?
A: Look for metallic particles on the magnetic drain plug or in the oil filter. If you notice erratic shifting combined with a whining noise from the rear housing area, the carrier splines may be damaged. A visual inspection of the SCREEN SHEET (4657301032) for debris is also a strong indicator.