Overview
The ZF 4646.252.051 SPUR GEAR is a critical power transmission component engineered specifically for the WG 250 series. This OEM genuine part is responsible for transferring rotational force between parallel shafts within the transmission housing, ensuring smooth torque delivery and precise gear engagement. Positioned within the intermediate shaft assembly, the spur gear (SKU: 4646.252.051) works in concert with the TRANSMISSION HOUSING to maintain correct gear mesh alignment. Its hardened tooth profile is designed to withstand high cyclic loads and continuous operation in heavy-duty industrial applications.
Symptoms of Failure
- Whining or grinding noise during acceleration: Worn gear teeth produce a distinct high-pitched whine or metallic grinding sound, especially under load, indicating surface fatigue or pitting on the 4646.252.051 spur gear.
- Vibration in the driveline at specific RPM ranges: As the gear profile degrades, uneven tooth contact creates harmonic vibrations that can be felt through the chassis or transmission housing.
- Metal particles in transmission oil: Flaking or chipped gear teeth shed ferrous debris into the lubricant, visible during oil changes or as sludge on the magnetic drain plug.
- Intermittent gear slippage or loss of torque: Excessive backlash from a worn spur gear causes momentary disengagement under heavy load, resulting in power loss or erratic shifting behavior.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 4646.252.051 |
| Gear Type | Spur Gear (Straight Cut) |
| Material | Case-Hardened Alloy Steel (20MnCr5 equivalent) |
| Module | 4.5 mm |
| Number of Teeth | 28 |
| Outside Diameter | 135.0 mm |
| Face Width | 32.0 mm |
| Bore Diameter | 45.0 mm |
| Weight | 1.85 kg |
| Hardness | 58-62 HRC (case depth 0.8-1.2 mm) |
| OEM Reference | ZF 4646.252.051 |
Compatibility
This spur gear is primarily designed for the ZF WG 250 series transmission. It is also compatible with the WG 180 and WG 200 models where the intermediate shaft gear train shares identical tooth geometry and spline dimensions. The 4646.252.051 gear interfaces directly with the HOUSING bearing bore and is retained by the COVER assembly. For proper installation, use the specified HEXAGON SCREW fasteners to secure the cover and maintain correct axial clearance. Always verify shaft alignment and backlash tolerances when replacing this gear in any WG-series variant.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4646101028 | TRANSMISSION HOUSING | Encloses and supports gear train assembly |
| 4646301095 | HOUSING | Intermediate housing for bearing support |
| 4646301087 | COVER | Seals and retains spur gear axial position |
| 0636015304 | HEXAGON SCREW | Fastens cover to housing |
| 0636101828 | CAP SCREW | Secures bearing retainers |
| 4646301102 | COVER SHEET | Protective shim for gear face |
| 4646301098 | COVER SHEET | Adjustable spacer for gear clearance |
| 0730365125 | TYPE PLATE | Identification tag for transmission model |
| 0631311009 | GROOVED STUD | Alignment dowel for housing assembly |
| 0636101193 | CAP SCREW | High-tensile fastener for gear retention |
ZF 4646.252.051 SPUR GEAR – Gear RFQ Support
Use ZF 4646.252.051 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 4646.252.051 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 | 4646.252.051 |
|---|---|
| Normalized SKU | 4646252051 |
| 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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- ZF 4642.353.026 SPUR GEAR
- ZF 4143.142.013 GEAR SHIFT SENSOR
- ZF 4143.142.022 GEAR SHIFT SENSOR
