Overview
The ZF 4644.303.182 SPUR GEAR is a precision-engineered component designed for the WG 181 series transmission. This OEM genuine part plays a critical role in transferring rotational force between parallel shafts within the gear train, ensuring smooth power delivery and optimal torque distribution. Positioned within the intermediate shaft assembly, the spur gear directly engages with adjacent gears to maintain synchronized operation under heavy loads. The SKU 4644.303.182 is manufactured to ZF’s exacting tolerances, guaranteeing a perfect fit and long service life in demanding industrial applications.
Symptoms of Failure
- Whining or grinding noise during gear engagement: Worn teeth on the spur gear produce audible metallic sounds, especially under load, indicating surface fatigue or pitting.
- Intermittent power loss or gear slipping: As the gear profile degrades, the transmission may fail to maintain consistent torque transfer, leading to erratic performance.
- Metallic debris in transmission oil: Flaking or chipped gear teeth contaminate the lubricant, visible as shiny particles during oil changes.
- Vibration at specific RPM ranges: Uneven wear on the spur gear creates imbalance, causing noticeable tremors through the drivetrain.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4644.303.182 |
| Gear Type | Spur Gear (Straight-Cut) |
| Material | Case-Hardened Alloy Steel (20MnCr5 equivalent) |
| Number of Teeth | 42 (estimated) |
| Module | 4.5 mm (estimated) |
| Outside Diameter | 198 mm |
| Bore Diameter | 55 mm |
| Face Width | 45 mm |
| Weight | 2.8 kg |
| OEM Reference | ZF 4644.303.182 |
Compatibility
This spur gear is primarily designed for the ZF WG 181 series transmission, commonly found in medium-duty trucks and industrial machinery. Based on its design and tooth profile, it is also compatible with the ZF WG 180 and WG 200 series models that share similar gear train architecture. Always verify fitment with your specific transmission serial number before installation. The gear interfaces directly with the 4644101047 TRANSMISSION HOUSING and the 4644301380 HOUSING to maintain proper alignment.
During replacement, it is essential to inspect associated components such as the 4644301189 THREADED BUSH and the 0730365067 TYPE PLATE for wear. These parts work in concert with the spur gear to ensure reliable operation and prevent premature failure.
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 fasteners |
| 0730365067 | TYPE PLATE | Identification plate with transmission specs |
| 0631311009 | GROOVED STUD | Locating pin for gear alignment |
| 4644301161 | COVER PLATE | Seals the gear chamber |
| 0636100621 | HEXAGON SCREW | Fastens housing components |
| 0631610020 | SET SCREW | Locks gear position on shaft |
| 0634801098 | SEALING RING | Prevents oil leakage at joints |
| 4644301117 | FIXING PLATE | Secures gear assembly to housing |
ZF 4644.303.182 SPUR GEAR – Gear RFQ Support
ZF 4644.303.182 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 4644.303.182 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 | 4644.303.182 |
|---|---|
| Normalized SKU | 4644303182 |
| 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
