Overview
The ZF 4681.302.001 INPUT GEAR is a critical power-transfer component engineered for the BP210, BP230, and WG190 series transmissions. This OEM genuine part sits at the front of the main shaft assembly, directly engaging with the engine flywheel or torque converter to transmit rotational force into the gearbox. The SKU 4681.302.001 is precision-machined to ZF’s exacting tolerances, ensuring minimal backlash and optimal load distribution across the planetary gear sets. When paired with a robust TRANSMISSION HOUSING, this input gear maintains alignment and reduces vibration, extending the service life of the entire driveline.
Symptoms of Failure
- Whining or growling noise during acceleration: Worn gear teeth on the 4681.302.001 produce a distinct high-pitched whine that intensifies under load, often mistaken for bearing failure.
- Hard shifting or gear slippage: As the input gear loses tooth profile integrity, it fails to maintain positive engagement, causing delayed or erratic shifts between forward and reverse.
- Metallic debris in transmission fluid: Flaking or pitting of the gear surface sheds fine metal particles into the oil, visible during routine drain intervals.
- Vibration at the shift lever or chassis: Uneven wear on the input gear creates rotational imbalance, transmitting tremors through the HOUS.FRONT SECT and into the vehicle frame.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4681.302.001 |
| Material | Case-hardened alloy steel (20MnCr5 equivalent) |
| Number of Teeth | 23 (helical, 30° pressure angle) |
| Outside Diameter | 112.4 mm |
| Shaft Bore Diameter | 38.0 mm (spline-fit) |
| Overall Length | 68.5 mm |
| Weight | 1.85 kg |
| OEM Reference | ZF 4681.302.001 (genuine) |
| Heat Treatment | Carburized & tempered to HRC 58-62 |
Compatibility
This input gear is directly compatible with ZF’s BP210, BP230, WG190, and WG210 series transmissions. It also fits select WG180 and WG200 variants where the input shaft spline count and pilot bearing diameter match. The gear interfaces with the HOUSING REAR PART and the HOUSING REAR SECTION to form the complete input shaft assembly. Always verify your transmission’s serial number against ZF’s parts catalog before ordering.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 0631306816 | CYLINDRICAL PIN | Locates and aligns gear train components |
| 0636100801 | CAP SCREW | Secures input gear retaining plate |
| 4681301015 | FIXING PLATE | Prevents axial movement of input gear |
| 4681301016 | SCREEN SHEET | Filters debris from lubrication oil |
| 4681301017 | SCREEN SHEET | Secondary filtration for high-pressure circuits |
| 0636100803 | CAP SCREW | Fastens housing sections together |
Frequently Asked Questions
Q: Can the 4681.302.001 input gear be replaced without removing the transmission from the vehicle?
A: In most applications, the transmission must be removed and the front housing disassembled to access the input gear. The TRANSMISSION HOUSING must be unbolted, and the HOUS.FRONT SECT separated to slide the gear off the shaft.
Q: How do I confirm the input gear is the source of my transmission noise?
A: Listen for a rhythmic whine that changes pitch with engine RPM but is unaffected by gear selection. If the noise disappears when the transmission is in neutral, the input gear or its bearings are likely worn.
Q: Is the 4681.302.001 interchangeable with any aftermarket input gears?
A: Only genuine ZF parts guarantee correct tooth geometry and heat treatment. Aftermarket gears often use softer steel, leading to premature failure and contamination of the HOUSING REAR PART with metal debris.
📞 Need this part? Contact our ZF specialists:
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Phone: +86 158 2286 3467 |
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ZF 4681.302.001 INPUT GEAR – Gear RFQ Support
PartsZF helps B2B buyers source ZF 4681.302.001 INPUT 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 4681.302.001 when sending your RFQ. PartsZF can review dotted, spaced, and compact number formats against the available product and documentation records.
Application Context
- Documentation reference: 4657024601
- Documentation reference: 4657024602
- Documentation reference: 4657024608
- Documentation reference: 4657054601
- Illustration section: INPUT
Cross Reference Support
- Cross-reference record available for RFQ review.
Specification Snapshot
| ZF part number | 4681.302.001 |
|---|---|
| Normalized SKU | 4681302001 |
| Part name | INPUT 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.
Related Parts
- ZF 4646.302.128 HELICAL GEAR
- ZF 4646.303.089 GEAR
- ZF 4646.308.017 GEAR
- ZF 4657.302.004 INPUT GEAR
- ZF 4646.356.002 GEAR
