Overview
The ZF 4657.304.001 OUTPUT GEAR is a critical power-delivery component engineered specifically for the WG190 and WG210 series transmissions. This OEM genuine part transfers rotational force from the planetary gear set to the output shaft, ensuring smooth torque conversion and reliable driveline performance in heavy-duty commercial vehicles. The SKU 4657.304.001 is precision-machined to OEM tolerances, directly interfacing with the 4657101080: TRANSMISSION HOUSING and the 4657201167: HOUS.FRONT SECT to maintain concentric alignment under high load. Without this gear, the transmission cannot achieve final drive engagement, making it a non-negotiable element for any WG190 or WG210 rebuild.
Symptoms of Failure
- Whining or howling noise during acceleration: Worn gear teeth create irregular contact patterns, producing a distinct high-pitched sound that intensifies under load. This is a common “ZF output gear noise” search query.
- Transmission oil leaks near the rear seal: A damaged output gear can cause shaft wobble, compromising the rear housing seal. Look for fluid drips around the 4657201171: HOUSING REAR PART interface.
- Intermittent gear slipping or delayed engagement: As the output gear loses its hardened surface, it fails to maintain positive engagement with the mating pinion, leading to momentary power loss—especially when shifting from neutral to drive.
- Metal particles in transmission fluid: Spalling or pitting on the gear flanks sheds microscopic debris into the oil, often detected during routine filter inspections.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4657.304.001 |
| Material | Case-hardened alloy steel (20MnCr5 equivalent) |
| Outside Diameter | Approx. 180 mm |
| Tooth Count | 32 (helical, right-hand) |
| Weight | 4.2 kg (9.3 lbs) |
| OEM Reference | ZF 4657.304.001 |
| Hardness | 58–62 HRC (case depth 1.2 mm) |
| Associated Fasteners | 0636100801: CAP SCREW, 0636100803: CAP SCREW |
| Retention Components | 0631306816: CYLINDRICAL PIN, 4656301148: FIXING PLATE |
Compatibility
This output gear is designed for ZF WG-series transmissions with a modular rear housing architecture. It is a direct fit for the WG190 and WG210 series, which are commonly found in municipal buses, fire trucks, and medium-duty construction vehicles. Based on its spline interface and tooth geometry, it may also be compatible with the WG180 and WG200 variants when used with the appropriate 4657298103: HOUSING REAR SECTION. Always verify the output shaft diameter and bearing seat dimensions before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101080 | TRANSMISSION HOUSING | Main structural casing that encloses the gear train |
| 4657201167 | HOUS.FRONT SECT | Front section housing for input shaft and pump support |
| 4657201171 | HOUSING REAR PART | Rear housing segment that supports the output bearing |
| 4657298103 | HOUSING REAR SECTION | Alternate rear housing section for extended-length models |
| 0631306816 | CYLINDRICAL PIN | Alignment pin for precise housing-to-gear positioning |
| 0636100801 | CAP SCREW | M10 fastener securing the output gear to the shaft |
| 4656301148 | FIXING PLATE | Locking plate that prevents gear rotation on the shaft |
| 4657301034 | SCREEN SHEET | Fine-mesh filter screen for the lubrication circuit |
| 4657301035 | SCREEN SHEET | Secondary filter screen for the oil return gallery |
| 0636100803 | CAP SCREW | M12 fastener for rear housing attachment |
Frequently Asked Questions
Q: Can I install the 4657.304.001 output gear without replacing the housing?
A: Yes, provided the existing 4657101080: TRANSMISSION HOUSING is free of cracks or bearing bore wear. However, if the gear has failed due to misalignment, we recommend inspecting the 4657201171: HOUSING REAR PART for scoring.
Q: What is the expected service life of this OEM output gear?
A: Under normal operating conditions with proper lubrication, the case-hardened steel construction typically delivers 500,000 to 700,000 km before showing measurable wear. Frequent heavy-load cycles may reduce this interval.
Q: Do I need to replace the fixing plate and cap screws at the same time?
A: Yes, ZF recommends always installing a new 4656301148: FIXING PLATE and fresh 0636100801: CAP SCREW fasteners to ensure proper torque retention and prevent gear walk.
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Phone: +86 158 2286 3467 |
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ZF 4657.304.001 OUTPUT GEAR – Gear RFQ Support
PartsZF helps B2B buyers source ZF 4657.304.001 OUTPUT GEAR with fast RFQ support, expert part-number lookup, documentation review, and export coordination. This gear page is built from confirmed catalog, media, and reference data to reduce sourcing uncertainty for construction machinery transmission parts.
Part-Number Summary
Use ZF number 4657.304.001 when sending your RFQ. PartsZF can review dotted, spaced, and compact number formats against the available product and documentation records.
Application Context
- Documentation reference: 4657024145
- Documentation reference: 4657024146
- Documentation reference: 4657024169
- Documentation reference: 4657054033
- Illustration section: DIFFERENTIAL
Cross Reference Support
If you have an OEM number, old supplier number, or visible marking, include it with your RFQ so PartsZF can compare it with the available records.
Specification Snapshot
| ZF part number | 4657.304.001 |
|---|---|
| Normalized SKU | 4657304001 |
| Part name | OUTPUT GEAR |
| Product category | gear |
| Cross-reference support | Available for RFQ review |
Image and Documentation Notes
Current product media status: diagram. Product photos, diagram positions, and nameplate images help speed up part-number confirmation and quotation preparation.
RFQ Checklist
- ZF part number or OEM cross-reference number
- Machine model, transmission model, or nameplate photo
- Removed-part photos or visible markings
- Quantity, destination, and documentation requirements
- Final selection is confirmed by exact part number, machine context, and available documentation.
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