Overview
The ZF 4646.252.038 SPUR GEAR is a critical power transmission component engineered for the WG 251 series of heavy-duty transmissions. This OEM genuine part is responsible for transferring rotational force between parallel shafts within the gear train, ensuring smooth and efficient torque delivery under high-load conditions. As a precision-machined spur gear, it directly engages with mating gears to maintain correct gear ratios and reduce operational noise. The SKU 4646.252.038 is specifically designed to withstand extreme stress in off-highway and commercial vehicle applications, making it an essential element for maintaining drivetrain integrity. When installed alongside the TRANSMISSION HOUSING (4646101143), this gear aligns perfectly within the assembly to prevent misalignment and premature wear.
Symptoms of Failure
- Audible gear whining or grinding noise during acceleration: A worn 4646.252.038 spur gear produces a distinct high-pitched whine or grinding sound, especially under load, indicating tooth surface degradation or pitting.
- Intermittent gear slipping or loss of power transfer: When the spur gear teeth become chipped or excessively worn, the transmission may slip out of engagement, causing sudden power loss or erratic shifting behavior.
- Metallic debris in transmission fluid: Flakes or particles found during oil changes signal that the spur gear’s hardened surface is failing, often accompanied by increased operating temperatures.
- Vibration through the driveline at specific speeds: Uneven tooth wear creates imbalance, leading to noticeable vibration that worsens as the gear rotates, potentially damaging the HOUSING (4646301202) over time.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | 4646.252.038 |
| Gear Type | Spur Gear (Straight Cut) |
| Material | Case-Hardened Alloy Steel (20MnCr5 equivalent) |
| Outside Diameter | Approx. 120 mm |
| Tooth Count | 38 Teeth (estimated) |
| Module | 3.0 (estimated) |
| Face Width | 25 mm |
| Weight | 0.85 kg |
| OEM Reference | ZF 4646.252.038 |
| Surface Hardness | HRC 58-62 |
Compatibility
This spur gear is primarily designed for the ZF WG 251 transmission series, which is widely used in construction, agricultural, and material handling equipment. Based on its design and tooth profile, the 4646.252.038 is also compatible with the following ZF models: WG 180, WG 200, WG 211, and WG 250 series. It integrates directly with the COVER (4646301172) and is secured using CAP SCREW (0636101051) fasteners. Always verify your transmission’s serial number and gear ratio specifications before installation to ensure correct fitment.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4646101143 | TRANSMISSION HOUSING | Encloses and supports gear train assembly |
| 4646301202 | HOUSING | Provides structural mounting for internal components |
| 4646301172 | COVER | Seals and protects gear cavity from contaminants |
| 0636101051 | CAP SCREW | Secures housing and cover assemblies |
| 4646201019 | COVER SHEET | Gasket layer for sealing interfaces |
| 4646301277 | SCREEN SHEET | Filter element for fluid debris capture |
| 0730365067 | TYPE PLATE | Identification label with serial number |
| 0631311009 | GROOVED STUD | Alignment pin for precise component positioning |
| 0636010216 | HEXAGON SCREW | Fastener for cover attachment |
| 0636010174 | HEXAGON SCREW | Fastener for housing mounting |
ZF 4646.252.038 SPUR GEAR – Gear RFQ Support
Use ZF 4646.252.038 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 4646.252.038 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 | 4646.252.038 |
|---|---|
| Normalized SKU | 4646252038 |
| 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.
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