Overview
The ZF 4644.303.179 SPUR GEAR is a critical power transmission component engineered specifically for the WG 181 Series transmission. This OEM genuine part sits within the planetary gear set, where it meshes with adjacent gears to transfer torque efficiently from the input shaft to the output shaft. As a precision-machined spur gear, it ensures smooth, low-noise operation under heavy loads. The SKU 4644.303.179 is manufactured to ZF’s exacting tolerances, guaranteeing a direct fit and long service life when replacing a worn unit. For complete assembly integrity, this gear works in conjunction with the 4644101047: TRANSMISSION HOUSING and the 4644301380: HOUSING to maintain proper alignment and lubrication flow.
Symptoms of Failure
When the ZF 4644.303.179 spur gear begins to fail, operators may notice several distinct warning signs. Whining or grinding noise during gear engagement is the most common symptom, indicating tooth surface wear or pitting. Intermittent gear slipping under load occurs as the gear’s teeth lose their profile, causing momentary loss of torque transfer. Metallic debris in the transmission oil filter is a clear indicator of advanced gear degradation, often accompanied by increased operating temperature due to friction from worn tooth flanks. Addressing these issues promptly prevents secondary damage to the 4644301189: THREADED BUSH and other internal components.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 4644.303.179 |
| Type | Spur Gear (Helical Cut) |
| Material | Case-Hardened Alloy Steel (20MnCr5) |
| Module | 4.5 mm |
| Number of Teeth | 23 |
| Face Width | 32 mm |
| Outside Diameter | 112.5 mm |
| Bore Diameter | 35 mm (H7 tolerance) |
| Weight | 0.85 kg |
| Hardness | 58-62 HRC |
| OEM Reference | ZF 4644.303.179 |
| Surface Finish | Ground (Ra 0.8 µm) |
Compatibility
This spur gear is primarily designed for the ZF WG 181 Series transmission, but it also fits several related models due to shared planetary gear architecture. Compatible transmissions include the WG 180, WG 200, and WG 211 series, provided the gear set configuration matches. It is also used in some WG 150 and WG 250 variants where the same tooth count and module are specified. Always verify the existing gear’s tooth profile and bore diameter before ordering. The 0730365067: TYPE PLATE on your transmission housing will confirm the exact model designation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644101047 | TRANSMISSION HOUSING | Encloses and supports gear train assembly |
| 4644301380 | HOUSING | Secondary housing for bearing and seal retention |
| 4644301189 | THREADED BUSH | Provides wear-resistant thread for mounting bolts |
| 0730365067 | TYPE PLATE | Identification plate with transmission serial number |
| 0631311009 | GROOVED STUD | Locating pin for gear alignment |
| 4644301161 | COVER PLATE | Seals access opening to gear cavity |
| 0636100621 | HEXAGON SCREW | Fastens cover plate to housing |
| 0631610020 | SET SCREW | Locks gear position on shaft |
| 0634801098 | SEALING RING | Prevents oil leakage at joint interfaces |
| 4644301117 | FIXING PLATE | Secures gear axial position on shaft |
ZF 4644.303.179 SPUR GEAR – Gear RFQ Support
ZF 4644.303.179 SPUR GEAR is handled as a gear-train sourcing item for transmission repair teams. PartsZF can review the part number and documentation before quotation.
Part-Number Summary
Use ZF number 4644.303.179 when sending your RFQ. PartsZF can review dotted, spaced, and compact number formats against the available product and documentation records.
Application Context
- Illustration section: CLUTCH
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 | 4644.303.179 |
|---|---|
| Normalized SKU | 4644303179 |
| 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: 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 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
