Overview
The ZF 4657.374.005 DISC CARRIER is a critical rotating component within the WG 191 transmission series, responsible for housing and aligning the clutch disc packs during gear engagement. This OEM genuine part ensures precise torque transfer and smooth shifting under heavy-duty industrial loads. The SKU 4657.374.005 sits directly on the main shaft, interfacing with the 4657120005 PRESSURE REGULATOR to maintain consistent hydraulic pressure across the clutch assembly. Without a properly functioning disc carrier, the transmission cannot maintain gear position or handle peak torque demands.
Symptoms of Failure
- Delayed or harsh gear engagement: When the disc carrier wears, clutch packs lose alignment, causing noticeable lag or clunking during shifts.
- Intermittent gear slipping under load: A worn carrier allows disc pack movement, leading to torque loss and RPM flare during acceleration.
- Metallic debris in transmission fluid: Friction between the carrier and clutch discs generates fine metal particles, visible during oil changes.
- Abnormal vibration at specific RPM ranges: Carrier imbalance from wear creates harmonic vibrations felt through the driveline.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | 4657.374.005 |
| Material | High-strength alloy steel, induction-hardened |
| Outer Diameter | 185 mm (estimated) |
| Inner Diameter | 65 mm (estimated) |
| Weight | 2.8 kg (6.2 lbs) |
| OEM Reference | ZF 4657.374.005 |
| Surface Treatment | Phosphate coating for corrosion resistance |
Compatibility
This disc carrier is engineered for the ZF WG 191 series but also fits select models in the WG180 and WG200 families due to shared clutch pack dimensions. It is commonly used in WG191, WG180, and WG200 transmissions found in heavy-duty trucks, construction equipment, and agricultural machinery. For precise fitment, verify your transmission’s serial number against the carrier’s spline count and depth. The carrier works in conjunction with the 0501211384 VALVE to modulate clutch application and the 0630532183 INDENTED RING that secures the carrier in its bore.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657120005 | PRESSURE REGULATOR | Controls hydraulic pressure to clutch packs |
| 0501211384 | VALVE | Modulates oil flow for shift timing |
| 0630532183 | INDENTED RING | Locks disc carrier in transmission bore |
| 4656306145 | PISTON | Applies force to clutch pack via hydraulic pressure |
| 0732042767 | COMPRESSION SPRING | Returns piston to neutral position |
| 0631612064 | SET SCREW | Secures valve body components |
| 0631610026 | SET SCREW | Adjusts pressure regulator preload |
| 4657101049 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 4657301130 | HOUS.FRONT SECT | Front section of transmission housing |
| 4657301131 | HOUSING REAR PART | Rear section of transmission housing |
Frequently Asked Questions
Q: Can I reuse the old indented ring when installing a new disc carrier?
A: No. The 0630532183 INDENTED RING deforms during installation and must be replaced to ensure proper carrier retention.
Q: Does the disc carrier require special tools for installation?
A: Yes. A ZF-specific bearing press and alignment fixture are recommended to avoid damaging the carrier’s splines or the 4656306145 PISTON bore.
Q: How does a failing disc carrier affect the pressure regulator?
A: Worn carriers cause erratic clutch pack movement, which forces the 4657120005 PRESSURE REGULATOR to overcompensate, leading to premature valve wear and oil contamination.
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Email: info@partszf.com |
Phone: +86 158 2286 3467 |
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