Overview
The ZF 4657.302.003 INPUT GEAR is a precision-machined component engineered for the WG190 transmission series and its related BP and WG variants. This gear sits at the front of the main shaft assembly, directly transferring torque from the engine to the planetary gear sets. As an OEM genuine part, SKU 4657.302.003 ensures exact tooth geometry and metallurgical integrity, preventing premature wear in high-load industrial applications. The input gear interfaces with the TRANSMISSION HOUSING and the HOUS.FRONT SECT, forming the critical load path for power delivery.
Symptoms of Failure
- Whining or grinding noise during acceleration: Worn input gear teeth produce a high-pitched whine that intensifies under load, often mistaken for bearing failure.
- Delayed engagement or gear slipping: As the input gear loses its hardened surface, it fails to mesh cleanly with the clutch pack, causing hesitation when shifting from neutral to drive.
- Metallic debris in transmission fluid: Flaking or chipped gear teeth contaminate the oil, which can be detected during routine filter inspections or oil changes.
- Vibration at specific RPM ranges: Uneven tooth wear creates harmonic vibrations that resonate through the HOUSING REAR PART, felt as a shudder in the driveline.
Technical Specifications
| Parameter | Value |
| Part Number | 4657.302.003 |
| Gear Type | Helical input gear |
| Material | Case-hardened alloy steel (20MnCr5 equivalent) |
| Tooth Count | 28 teeth (estimated) |
| Outside Diameter | ~120 mm |
| Weight | ~1.8 kg (4.0 lbs) |
| OEM Reference | ZF 4657.302.003 |
| Hardness | 58-62 HRC |
| Fastener Torque | Use CAP SCREW (0636100801) at 45 Nm |
Compatibility
This input gear is designed for ZF WG190 transmissions and is also compatible with the BP 210, BP 230, WG 210, and WG 230 series. It fits models including WG180, WG200, WG190, and WG210 when used with the correct CYLINDRICAL PIN for alignment. Always verify the gear ratio and shaft spline count against your specific transmission tag before ordering.
Related Components
| Part Number | Name | Function |
| 4657101033 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 4657201027 | HOUS.FRONT SECT | Front section supporting input shaft |
| 4657201012 | HOUSING REAR PART | Rear housing enclosing output assembly |
| 0631306792 | CYLINDRICAL PIN | Alignment dowel for housing halves |
| 0636100801 | CAP SCREW | Fastener for gear retention |
| 4656301148 | FIXING PLATE | Locks gear to shaft |
| 4657301032 | SCREEN SHEET | Fine mesh filter for oil circuit |
| 4657301033 | SCREEN SHEET | Secondary oil strainer |
| 0636100803 | CAP SCREW | Bolt for housing assembly |
| 4681301040 | OIL FEED.HOUSG. | Lubrication channel for input gear |
Frequently Asked Questions
Q: Can I replace the input gear without removing the transmission?
A: No. The 4657.302.003 gear requires full transmission disassembly, including separation of the HOUS.FRONT SECT and removal of the main shaft. Plan for an in-chassis or bench rebuild.
Q: How do I know if my WG190 uses this exact gear?
A: Check the stamped part number on the gear face. If the number is worn, measure the tooth count—this gear has 28 teeth. Cross-reference with your transmission serial number.
Q: Is this gear compatible with the BP 230 series?
A: Yes, the 4657.302.003 is listed under BP 230 and WG 230 categories. However, always verify the spline count and shaft diameter match your unit.
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ZF 4657.302.003 Part Context
ZF 4657.302.003 is listed in the local BOM as INPUT GEAR. Use the exact ZF number when confirming replacement or RFQ details.
Compatibility and Assembly Context
4 WG 190
Cross Reference
SP158279
Replacement Scenario
Use this input gear listing to confirm the part number, assembly section, and image evidence before procurement.
Specification Snapshot
| ZF Number | 4657.302.003 |
|---|---|
| Name | INPUT GEAR |
| Sections | INPUT |
Related PartsZF Hubs
FAQ
Can this part be ordered directly from the number?
Use the ZF number as the primary lookup key, then confirm assembly context and cross-reference evidence before purchase.
Does this page replace fitment confirmation?
No. Final fitment should be confirmed against the machine, transmission family, and available BOM or diagram evidence.
