Overview
The ZF 4646.353.091 SPUR GEAR is a critical power transmission component engineered for the WG 251 Series heavy-duty transmission. This OEM genuine part functions as a primary gear within the planetary gearset, transferring torque from the input shaft to the countershaft assembly. Precision-ground teeth ensure minimal backlash and efficient load distribution under high-stress operating conditions. The SKU 4646.353.091 is machined from case-hardened alloy steel to withstand continuous duty cycles in construction and agricultural machinery. When installed, this spur gear meshes directly with the 4646101072: TRANSMISSION HOUSING and the 4646301201: HOUSING to maintain proper gear alignment and oil circulation.
Symptoms of Failure
- Whining or grinding noise during gear engagement: Worn spur gear teeth produce a high-pitched metallic sound, especially under load, indicating pitting or chipping on the tooth flank.
- Intermittent power loss or gear slippage: As the gear profile degrades, torque transfer becomes inconsistent, causing the transmission to momentarily lose drive in forward or reverse.
- Metallic debris in transmission oil: Flakes or particles found during oil changes signal advanced wear of the spur gear, often accompanied by damage to the 4646301166: COVER and bearing surfaces.
- Vibration at specific RPM ranges: Uneven tooth wear creates harmonic vibrations that resonate through the driveline, worsening over time if the 0636101051: CAP SCREW fasteners loosen.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4646.353.091 |
| Gear Type | Spur Gear, Helical Cut |
| Material | 20MnCr5 Case-Hardened Steel |
| Outside Diameter | 142.5 mm |
| Face Width | 38.0 mm |
| Number of Teeth | 28 |
| Module | 4.5 |
| Weight | 2.85 kg |
| OEM Reference | ZF 4646.353.091 |
| Hardness | 58-62 HRC |
Compatibility
This spur gear is specifically designed for the WG 251 Series transmission, but it also fits select models in the ZF WG family due to shared gear geometry. Compatible transmissions include:
- ZF WG 251
- ZF WG 180 (with adapter housing)
- ZF WG 200 (late production)
- ZF WG 210 (limited compatibility)
Always verify the gear tooth count and shaft spline configuration before installation. The 4646101072: TRANSMISSION HOUSING and 4646301201: HOUSING must be inspected for wear when replacing this gear to prevent premature failure.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4646101072 | TRANSMISSION HOUSING | Encloses gear train and supports bearings |
| 4646301201 | HOUSING | Intermediate housing for clutch pack |
| 4646301166 | COVER | Seals the gear cavity and retains oil |
| 0636101051 | CAP SCREW | Fastens cover to housing |
| 4646201018 | COVER SHEET | Gasket layer for oil sealing |
| 4646301277 | SCREEN SHEET | Filter mesh for oil intake |
| 4646201019 | COVER SHEET | Secondary gasket for clutch housing |
| 0730365125 | TYPE PLATE | Identification tag for transmission model |
| 0631311009 | GROOVED STUD | Alignment pin for gear assembly |
| 0636010216 | HEXAGON SCREW | Mounting bolt for gear retention |
ZF 4646.353.091 SPUR GEAR – Gear RFQ Support
Use ZF 4646.353.091 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 4646.353.091 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 | 4646.353.091 |
|---|---|
| Normalized SKU | 4646353091 |
| 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
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- 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
