Overview
The ZF 4660.305.025 HELICAL GEAR is a precision-machined component engineered for the WG 92 series transmission family. This gear sits within the intermediate shaft assembly, where it transmits torque and reduces rotational noise through its angled tooth profile. As an OEM genuine part, the SKU 4660.305.025 ensures exact fitment and metallurgical consistency, directly supporting the load-bearing capacity of the gear train. When installed alongside the 4660101015: TRANSMISSION HOUSING, this helical gear maintains proper gear mesh alignment, preventing premature wear on adjacent components.
Symptoms of Failure
- Whining or howling noise during acceleration: Worn helical gear teeth create a distinct high-pitched sound, often misdiagnosed as bearing failure. This indicates uneven tooth contact patterns.
- Metallic debris in transmission fluid: Flaking or pitting on the gear flanks produces fine steel particles, visible during oil changes. This is a clear sign of surface fatigue.
- Intermittent gear slippage under load: As the helical angle degrades, the gear loses its ability to maintain constant mesh, causing momentary power loss during uphill climbs or heavy towing.
- Vibration through the shift lever: Excessive backlash from a worn 4660.305.025 gear transmits harmonic vibrations into the driveline, felt as a low-frequency shudder.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4660.305.025 |
| Gear Type | Helical, single-cut |
| Material | Case-hardened alloy steel (16MnCr5 equivalent) |
| Outside Diameter | 105.0 mm |
| Face Width | 32.5 mm |
| Helix Angle | 28.5° (right-hand) |
| Weight | 1.45 kg |
| OEM Reference | ZF 4660.305.025 |
Compatibility
This helical gear is primarily designed for the ZF WG 92 series, but it also fits select variants within the WG180 and WG200 transmission families where the intermediate shaft geometry matches. The 4660.305.025 is used in WG92-1, WG92-2, and WG92-3 models produced after 2015. For proper installation, verify that the 4660301054: HOUSING II is free of cracks, and that the 0631306174: CYLINDRICAL PIN is replaced to ensure correct gear positioning. Always cross-reference your transmission serial number against the 0769123894: TYPE PLATE for absolute compatibility confirmation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4660101015 | TRANSMISSION HOUSING | Encloses and supports the gear train assembly |
| 4660301054 | HOUSING II | Secondary housing for intermediate shaft support |
| 0631306174 | CYLINDRICAL PIN | Locates and aligns gear to shaft |
| 0769123894 | TYPE PLATE | Identification plate with transmission specs |
| 0750100022 | SCREW PLUG | Seals oil drain or fill port |
| 4660221029 | SUCTION TUBE | Draws oil from sump to pump |
| 0634100317 | O-RING | Seals housing joint against leaks |
| 0636103273 | CAP SCREW | Fastens housing halves together |
| 0634306311 | O-RING | Seals suction tube connection |
| 4660321029 | FIXING PLATE | Secures gear axial position |
ZF 4660.305.025 HELICAL GEAR – Gear RFQ Support
Use ZF 4660.305.025 HELICAL GEAR as the reference when requesting gear support. Photos, visible markings, and transmission context help reduce sourcing uncertainty.
Part-Number Summary
Use ZF number 4660.305.025 when sending your RFQ. PartsZF can review dotted, spaced, and compact number formats against the available product and documentation records.
Application Context
- Illustration section: COUPLING
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 | 4660.305.025 |
|---|---|
| Normalized SKU | 4660305025 |
| Part name | HELICAL GEAR |
| Product category | gear |
| RFQ support | Part-number lookup and documentation review |
| Media support | Product photo or diagram review when available |
Image and Documentation Notes
Current product media status: fallback. 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 4661.302.010 GEAR
- ZF 2094.306.024 GEAR SHIFT RAIL
- ZF 4642.353.026 SPUR GEAR
- ZF 4143.142.013 GEAR SHIFT SENSOR
- ZF 4143.142.022 GEAR SHIFT SENSOR
