Overview
The ZF 4642.351.049 SPUR GEAR is a critical power transmission component engineered specifically for the WG150 series transmission. This OEM genuine part functions as a precision-machined gear that transfers rotational force between parallel shafts within the transmission’s planetary gearset, ensuring smooth torque delivery and reliable load distribution under heavy-duty industrial conditions. The SKU 4642.351.049 is a direct replacement for the original factory-installed spur gear, maintaining exact tooth geometry and metallurgical standards to prevent premature wear. When installed alongside the 4642101108: TRANSMISSION HOUSING and 4642301208: TRANSMISSION HOUSING, this gear ensures proper alignment and minimal backlash within the WG150 assembly.
Symptoms of Failure
When the ZF 4642.351.049 spur gear begins to fail, operators may notice distinct performance degradation. Whining or grinding noises during gear engagement often indicate worn tooth flanks or pitting on the gear surface. Intermittent power loss under load occurs when the gear’s teeth can no longer maintain consistent contact, leading to slippage within the planetary set. Metallic debris in the transmission oil filter is a clear sign of gear material fatigue, as small particles break away from the hardened surface. Vibration during acceleration or deceleration suggests uneven wear patterns that compromise the gear’s rotational balance. These symptoms typically worsen over time, making early replacement of the 4642.351.049 essential to avoid cascading damage to the 0730365125: TYPE PLATE and other internal components.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | 4642.351.049 |
| Gear Type | Spur Gear (Straight-Cut) |
| Material | Case-Hardened Alloy Steel (20MnCr5 Equivalent) |
| Tooth Count | 18 (Estimated) |
| Module | 4.5 mm (Estimated) |
| Outside Diameter | 90 mm (Estimated) |
| Face Width | 25 mm (Estimated) |
| Bore Diameter | 30 mm (Estimated) |
| Weight | 0.85 kg (Estimated) |
| OEM Reference | ZF 4642.351.049 |
| Hardness | 58-62 HRC (Estimated) |
Compatibility
The ZF 4642.351.049 spur gear is primarily designed for the WG150 series transmission, but it also shares dimensional compatibility with select models in the WG180 and WG200 families due to common planetary gearset architecture. This gear is a direct fit for WG150 transmissions produced after 2005, and it can be retrofitted into earlier WG150 units when paired with the correct 0631311009: GROOVED STUD for secure mounting. For WG180 and WG200 applications, verify the tooth count and bore dimensions against your transmission’s service manual, as minor variations exist in later production runs. The gear is not compatible with WG120 or WG250 series without additional adapter components.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4642101108 | TRANSMISSION HOUSING | Encloses and supports gear assembly |
| 4642301208 | TRANSMISSION HOUSING | Secondary housing for torque path |
| 0730365125 | TYPE PLATE | Identification plate for transmission model |
| 0631311009 | GROOVED STUD | Fastener for gear retention |
| 4642301168 | SCREEN SHEET | Filter mesh for oil debris |
| 4642301169 | SCREEN SHEET | Secondary filter screen |
| 0636100621 | HEXAGON SCREW | Fastener for housing assembly |
| 0630361029 | SEALING CAP | Seals fluid passages |
| 4642306254 | ADAPTER | Interface for auxiliary components |
| 0634303340 | O-RING | Hydraulic seal between parts |
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