Overview
The ZF 4644.308.043 SPUR GEAR is a critical power transmission component engineered specifically for the WG 181 series transmission. This OEM genuine part functions as a precision-machined gear within the planetary gearset, transferring torque from the input shaft to the output assembly while maintaining exact rotational synchronization. The SKU 4644.308.043 is designed to withstand high cyclic loads and thermal stress, ensuring reliable operation in heavy-duty industrial applications. When installed correctly, this spur gear works in concert with the TRANSMISSION HOUSING (4644101047) and the HOUSING (4644301380) to form a sealed, lubricated gear chamber that minimizes friction and wear.
Symptoms of Failure
- Whining or grinding noise during gear engagement: A worn 4644.308.043 spur gear produces audible metallic sounds, especially under load, indicating tooth surface degradation or pitting.
- Intermittent gear slipping under torque: When the spur gear loses its tooth profile integrity, the transmission may momentarily lose power transfer, causing erratic vehicle or equipment movement.
- Metallic debris in transmission fluid: Flakes or particles found during oil changes directly point to spur gear wear, often accompanied by reduced hydraulic pressure.
- Vibration at specific RPM ranges: Uneven gear wear creates harmonic imbalances that transmit through the THREADED BUSH (4644301189) and housing, felt as chassis vibration.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4644.308.043 |
| Gear Type | Spur Gear, Helical Cut |
| Material | Case-Hardened Alloy Steel (20MnCr5) |
| Outside Diameter | 128.5 mm |
| Tooth Count | 32 Teeth |
| Module | 4.0 |
| Weight | 1.85 kg |
| OEM Reference | ZF 4644.308.043 |
| Hardness | 58-62 HRC |
| Surface Finish | Ground, Ra ≤ 0.8 µm |
Compatibility
This spur gear is primarily designed for the ZF WG 181 series transmission. It is also compatible with the closely related WG 180, WG 182, and WG 200 series models where the gearset dimensions match. The part integrates directly with the COVER PLATE (4644301161) and FIXING PLATE (4644301117) to secure the gear cluster. For complete assembly, ensure the TYPE PLATE (0730365067) is referenced to verify transmission variant. Always cross-check the tooth profile and shaft bore diameter against your specific WG series model before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644101047 | TRANSMISSION HOUSING | Encloses and supports gear assembly |
| 4644301380 | HOUSING | Secondary housing for bearing support |
| 4644301189 | THREADED BUSH | Provides threaded mounting point for sensors |
| 0730365067 | TYPE PLATE | Identification plate for transmission model |
| 0631311009 | GROOVED STUD | Locates and aligns housing components |
| 4644301161 | COVER PLATE | Seals gear cavity from contamination |
| 0636100621 | HEXAGON SCREW | Fastens cover plate to housing |
| 0631610020 | SET SCREW | Locks gear position on shaft |
| 0634801098 | SEALING RING | Prevents oil leakage at joints |
| 4644301117 | FIXING PLATE | Secures gear cluster axial position |
ZF 4644.308.043 SPUR GEAR – Gear RFQ Support
Use ZF 4644.308.043 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 4644.308.043 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 | 4644.308.043 |
|---|---|
| Normalized SKU | 4644308043 |
| Part name | SPUR GEAR |
| Product category | gear |
| RFQ support | Part-number lookup and documentation review |
| Media support | Product photo or diagram review when available |
| Weight | 6.35 |
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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