Overview
The ZF 4646.302.128 ENGRANAJE HELICOIDAL para WG260 is a precision-machined helical gear designed for the planetary gearset within ZF’s WG series powershift transmissions. As an OEM original component, this gear (SKU 4646.302.128) is responsible for transferring torque between parallel shafts while reducing noise and vibration through its angled tooth profile. It sits directly within the intermediate shaft assembly, meshing with adjacent planetary carriers to ensure smooth power delivery in heavy construction machinery. This gear works in concert with the TRANSMISSION HOUSING and the HOUSING to maintain precise alignment under high-load conditions.
Symptoms of Failure
When the 4646.302.128 helical gear begins to wear, operators will notice distinct performance degradation. Common failure indicators include:
- Whining or howling noise from the transmission – Worn gear teeth create irregular contact patterns, producing a high-pitched metallic sound during acceleration or deceleration.
- Intermittent gear slipping under load – As the helical flanks wear down, the gear loses its ability to maintain constant mesh, causing momentary power loss when climbing grades or moving heavy loads.
- Metal particles in transmission fluid – Flaking or pitting on the gear surface releases fine metallic debris into the oil, often visible during routine fluid changes or filter inspections.
- Vibration through the driveline – Uneven tooth wear creates rotational imbalance, transmitting noticeable shuddering through the chassis at specific RPM ranges.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 4646.302.128 |
| Type | Helical Gear (Engranaje Helicoidal) |
| Material | Case-hardened alloy steel (20MnCr5 equivalent) |
| Tooth Count | 23 (estimated) |
| Helix Angle | 25° (estimated) |
| Pitch Diameter | 92 mm (estimated) |
| Face Width | 38 mm (estimated) |
| Weight | 1.85 kg (estimated) |
| OEM Reference | ZF 4646.302.128 |
| Hardness | 58-62 HRC (case depth 0.8-1.2 mm) |
Compatibility
This helical gear is engineered for ZF WG-series powershift transmissions commonly used in wheel loaders, graders, and compactors. Based on its design and OEM numbering, the 4646.302.128 is compatible with the following transmission models:
- ZF WG180
- ZF WG200
- ZF WG260 (primary application)
- ZF WG310 (limited compatibility)
During installation, ensure the COVER is properly torqued using a HEXAGON SCREW to prevent axial play that could accelerate gear wear.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4646101028 | TRANSMISSION HOUSING | Encloses and supports gear train assembly |
| 4646301095 | HOUSING | Intermediate housing for shaft alignment |
| 4646301087 | COVER | Seals gear cavity and retains lubrication |
| 0636015304 | HEXAGON SCREW | Fastens cover to housing |
| 0636101828 | CAP SCREW | Secures bearing retainers |
| 4646301102 | COVER SHEET | Thin gasket for sealing surfaces |
| 4646301098 | COVER SHEET | Alternate gasket for different housing variants |
| 0730365125 | TYPE PLATE | Identification tag for transmission model |
| 0631311009 | GROOVED STUD | Alignment dowel for precise assembly |
| 0636101193 | CAP SCREW | High-torque fastener for gear retention |
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