Overview
The ZF 4642.308.403 SPUR GEAR is a critical power transmission component engineered specifically for the WG 150 Series transmission assembly. This OEM genuine part, identified by SKU 4642.308.403, functions as the primary gear that transfers rotational force from the input shaft to the countershaft, ensuring smooth torque delivery and precise gear engagement within the planetary system. Machined from high-strength alloy steel, this spur gear is designed to withstand heavy loads and high rotational speeds, making it essential for maintaining driveline efficiency in industrial and commercial vehicles. When installed correctly alongside the 4642101108: TRANSMISSION HOUSING and the 4642301208: TRANSMISSION HOUSING, it forms a robust foundation for the entire gear train.
Symptoms of Failure
- Whining or grinding noise during gear shifts: Worn gear teeth on the 4642.308.403 produce a distinct high-pitched whine or metallic grinding sound, especially under load, indicating surface fatigue or pitting.
- Intermittent power loss or gear slipping: As the spur gear loses tooth profile integrity, the transmission may slip out of gear or fail to maintain consistent torque delivery, causing erratic vehicle movement.
- Metallic debris in transmission fluid: Advanced wear of this spur gear generates fine steel particles that contaminate the oil, often visible during fluid changes as glitter-like particles, leading to further internal damage.
- Vibration at specific RPM ranges: Uneven tooth wear creates imbalance, causing noticeable vibrations through the driveline that intensify at certain engine speeds, often accompanied by a droning sound.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 4642.308.403 |
| Gear Type | Spur Gear (Straight Cut) |
| Material | Case-Hardened Alloy Steel (20MnCr5 Equivalent) |
| Number of Teeth | 28 (Estimated) |
| Pitch Diameter | 112 mm (Estimated) |
| Face Width | 35 mm (Estimated) |
| Weight | 1.85 kg (4.08 lbs) |
| OEM Reference | ZF 4642.308.403 |
| Hardness | HRC 58-62 (Case Depth 0.8-1.2 mm) |
Compatibility
This ZF 4642.308.403 spur gear is primarily designed for the WG 150 Series transmission family. Based on its gear geometry and spline configuration, it is also compatible with the WG 180 and WG 200 series transmissions that share the same planetary gearset architecture. The part is not interchangeable with the WG 120 or WG 250 series due to differences in shaft center distances and tooth module. For proper installation, ensure the 0730365125: TYPE PLATE matches your transmission model, and use the 0631311009: GROOVED STUD for secure mounting to the housing.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4642101108 | TRANSMISSION HOUSING | Encloses and supports the gear train assembly |
| 4642301208 | TRANSMISSION HOUSING | Secondary housing for bearing support and oil sealing |
| 0730365125 | TYPE PLATE | Identification plate with transmission model and serial number |
| 0631311009 | GROOVED STUD | Fastener for securing housing halves and gear shafts |
| 4642301168 | SCREEN SHEET | Oil filter mesh preventing debris from entering the gear mesh |
| 4642301169 | SCREEN SHEET | Secondary oil strainer for high-pressure lubrication circuits |
| 0636100621 | HEXAGON SCREW | M10 bolt for mounting the spur gear to the shaft hub |
| 0630361029 | SEALING CAP | Plugs unused oil passages to maintain system pressure |
| 4642306254 | ADAPTER | Interface component for connecting the gear to the output shaft |
| 0634303340 | O-RING | Seals the adapter-to-housing joint against oil leaks |
ZF 4642.308.403 SPUR GEAR – Gear RFQ Support
Use ZF 4642.308.403 SPUR GEAR as the reference when requesting gear support. Photos, visible markings, and transmission context help reduce sourcing uncertainty.
Part-Number Summary
Use ZF number 4642.308.403 when sending your RFQ. PartsZF can review dotted, spaced, and compact number formats against the available product and documentation records.
Application Context
- Illustration section: COUNTERSHAFT
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 | 4642.308.403 |
|---|---|
| Normalized SKU | 4642308403 |
| Part name | SPUR 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.
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