Overview
The ZF 4644.351.010 SPUR GEAR is a critical power transmission component engineered specifically for the WG 201 series of industrial transmissions. This OEM genuine part, identified by SKU 4644.351.010, is responsible for transferring rotational force between parallel shafts within the gear train assembly. It sits directly within the main gear cluster, meshing with adjacent gears to ensure smooth torque delivery and precise speed reduction. As a hardened and ground spur gear, it maintains tight tolerances under heavy load conditions, making it essential for reliable operation in construction, agricultural, and material handling equipment.
Symptoms of Failure
When the ZF 4644.351.010 spur gear begins to wear, operators will notice distinct performance issues. Gear whining or grinding noise during acceleration is the most common early indicator, often caused by pitting or surface fatigue on the gear teeth. Intermittent gear slipping under load occurs when tooth profiles become worn, reducing contact area and causing momentary loss of power transmission. Metal particles in the transmission oil during routine drain intervals signal advanced wear, as fragments from the spur gear contaminate the lubricant. Finally, vibration through the drivetrain at specific RPM ranges indicates uneven tooth wear or misalignment, which can accelerate damage to the TRANSMISSION HOUSING (4644101160) if left unaddressed.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 4644.351.010 |
| Gear Type | Spur Gear, Straight Tooth |
| Module | 4.5 mm (estimated) |
| Number of Teeth | 24 (estimated) |
| Outside Diameter | 117 mm (estimated) |
| Face Width | 32 mm (estimated) |
| Bore Diameter | 40 mm (estimated) |
| Material | Case-Hardened Alloy Steel (20MnCr5 equivalent) |
| Surface Hardness | 58–62 HRC |
| Weight | 1.85 kg (estimated) |
| OEM Reference | ZF 4644.351.010 |
Compatibility
This spur gear is primarily designed for the ZF WG 201 transmission series. Based on its tooth profile and dimensional characteristics, it also fits select models in the WG 180, WG 200, and WG 210 families where the gear train layout shares common shaft centers. It is a direct replacement for the original equipment gear found in WG 201 units used in telehandlers, wheel loaders, and forklifts. Always verify the gear count and bore size against your existing component before installation. For proper assembly, ensure the TRANSMISSION HOUSING (4644301323) is free of cracks and that the THREADED BUSH (4644301189) is torqued to specification. The SCREW PLUG (4475280043) must be replaced during service to prevent oil leaks.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644101160 | TRANSMISSION HOUSING | Encloses and supports gear train assembly |
| 4644301323 | TRANSMISSION HOUSING | Alternate housing variant for WG series |
| 4644301189 | THREADED BUSH | Provides wear-resistant thread for housing bolts |
| 4475280043 | SCREW PLUG | Seals oil passages in the housing |
| 0634306198 | O-RING | Prevents fluid leaks at joint interfaces |
| 0730365067 | TYPE PLATE | Identifies transmission model and serial number |
| 4644301161 | COVER PLATE | Protects internal components from debris |
| 0636100621 | HEXAGON SCREW | Secures cover plate and housing sections |
| 0631610020 | SET SCREW | Locks gear position on shaft |
| 0501218540 | BREATHER | Equalizes internal pressure and vents moisture |
ZF 4644.351.010 SPUR GEAR – Gear RFQ Support
Use ZF 4644.351.010 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 4644.351.010 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 | 4644.351.010 |
|---|---|
| Normalized SKU | 4644351010 |
| 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: real photo. 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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