Overview
The ZF 4646.337.028 SPUR GEAR is a critical power transmission component engineered specifically for the WG 251 Series transmission. This OEM genuine part functions as a precision-machined gear that transfers rotational force between parallel shafts within the gear train, directly influencing torque delivery and operational smoothness. Positioned within the intermediate shaft assembly, the spur gear meshes with adjacent gears to maintain correct gear ratios under heavy-duty loads. The SKU 4646.337.028 is manufactured to ZF’s exacting tolerances, ensuring seamless integration with the 4646101143: TRANSMISSION HOUSING and the 4646301202: HOUSING to maintain structural integrity during high-torque operations.
Symptoms of Failure
- Whining or grinding noise during gear engagement: Worn gear teeth produce audible metallic sounds, especially under load, indicating the spur gear’s tooth profile has degraded.
- Intermittent gear slipping under acceleration: A failing 4646.337.028 spur gear can cause momentary loss of power transfer, leading to erratic vehicle movement or hesitation.
- Metal particles in transmission fluid: As the gear surface wears, microscopic debris contaminates the oil, often detected during routine fluid changes or filter inspections.
- Vibration through the driveline: Uneven tooth wear creates imbalance, transmitting noticeable vibrations to the chassis and operator cabin at specific RPM ranges.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 4646.337.028 |
| Gear Type | Spur Gear (Straight-Cut) |
| Material | Case-Hardened Alloy Steel (20MnCr5 Equivalent) |
| Tooth Count | 28 (Estimated) |
| Module | 4.5 mm (Estimated) |
| Outside Diameter | 135 mm (Estimated) |
| Face Width | 32 mm (Estimated) |
| Weight | 1.8 kg (4.0 lbs) |
| OEM Reference | ZF 4646.337.028 |
| Hardness | 58-62 HRC (Case Depth 0.8-1.2 mm) |
Compatibility
This spur gear is primarily designed for the ZF WG 251 Series transmission, but its tooth geometry and shaft interface also support select models in the WG180, WG200, and WG240 families. It is a direct replacement for units requiring intermediate shaft gear renewal. When replacing the 4646.337.028, always inspect the 4646301172: COVER for wear and ensure the 0636101051: CAP SCREW is torqued to factory specifications to prevent gear misalignment. For complete assembly verification, cross-reference with your transmission’s serial number against ZF’s official parts catalog.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4646101143 | TRANSMISSION HOUSING | Encloses and supports gear train assembly |
| 4646301202 | HOUSING | Secondary casing for auxiliary gear sets |
| 4646301172 | COVER | Seals and protects internal gear components |
| 0636101051 | CAP SCREW | Fastens housing and cover with precise clamping force |
| 4646201019 | COVER SHEET | Thin protective layer over gear faces |
| 4646301277 | SCREEN SHEET | Filters debris from lubricating oil flow |
| 0730365067 | TYPE PLATE | Identification label with transmission specs |
| 0631311009 | GROOVED STUD | Alignment pin for precise gear positioning |
| 0636010216 | HEXAGON SCREW | Secures bearing retainers and brackets |
| 0636010174 | HEXAGON SCREW | Mounts auxiliary components to transmission body |
ZF 4646.337.028 SPUR GEAR – Gear RFQ Support
Use ZF 4646.337.028 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 4646.337.028 when sending your RFQ. PartsZF can review dotted, spaced, and compact number formats against the available product and documentation records.
Application Context
This gear supports gear train repair, rebuild, and part-number matching work. Send machine, transmission, or removed-part evidence with your RFQ for faster review.
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 | 4646.337.028 |
|---|---|
| Normalized SKU | 4646337028 |
| 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: fallback. 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
