Overview
The ZF 4646.356.009 HELICAL GEAR is a precision-engineered component designed for the WG 251 series transmission. This genuine OEM part plays a critical role in power transmission by meshing with adjacent gears to reduce noise, minimize vibration, and ensure smooth torque transfer under heavy loads. Located within the main gear train assembly, the helical gear’s angled teeth provide continuous contact, which enhances load capacity and operational efficiency. The SKU 4646.356.009 is manufactured to exact ZF tolerances, making it a direct replacement for worn or damaged gears in your transmission system.
Symptoms of Failure
- Whining or grinding noise during operation: A worn helical gear produces a distinct high-pitched whine or grinding sound, especially under load, indicating tooth surface damage or misalignment.
- Intermittent gear slipping or hesitation: As the gear teeth wear unevenly, the transmission may slip out of gear or hesitate during shifts, reducing driveline reliability.
- Metallic debris in transmission fluid: Flaking or pitting of the helical gear releases fine metal particles into the oil, which can be detected during routine fluid changes or filter inspections.
- Increased operating temperature: Excessive friction from a damaged gear generates heat, causing the transmission to run hotter than normal and potentially accelerating wear on nearby components.
Technical Specifications
| Specification | Detail |
|---|---|
| Part Number | 4646.356.009 |
| Gear Type | Helical, single-cut |
| Material | Case-hardened alloy steel |
| Outer Diameter | ~180 mm |
| Face Width | ~45 mm |
| Module | 4.5 |
| Number of Teeth | 38 |
| Weight | ~3.2 kg |
| OEM Reference | ZF 4646.356.009 |
Compatibility
This helical gear is primarily designed for the ZF WG 251 series transmission. It is also compatible with the WG 180, WG 200, and WG 250 series models that share the same gear train architecture. For proper fitment, verify the gear’s tooth count and module against your transmission’s service manual. When replacing this gear, inspect the TRANSMISSION HOUSING and HOUSING for wear, as these components support the gear’s bearings. Additionally, the COVER and CAP SCREW must be correctly torqued to maintain proper gear alignment and prevent premature failure.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4646101143 | TRANSMISSION HOUSING | Encloses and supports gear train assembly |
| 4646301202 | HOUSING | Provides bearing support and oil containment |
| 4646301172 | COVER | Seals the gear cavity and retains lubricant |
| 0636101051 | CAP SCREW | Secures housing and cover components |
| 4646201019 | COVER SHEET | Protects internal components from debris |
| 4646301277 | SCREEN SHEET | Filters oil and prevents particle ingress |
| 0730365067 | TYPE PLATE | Identifies transmission model and specs |
| 0631311009 | GROOVED STUD | Aligns and fastens gear train components |
| 0636010216 | HEXAGON SCREW | Secures gear and bearing assemblies |
| 0636010174 | HEXAGON SCREW | Fastens cover and housing interfaces |
ZF 4646.356.009 HELICAL GEAR – Gear RFQ Support
ZF 4646.356.009 HELICAL GEAR is handled as a gear-train sourcing item for transmission repair teams. PartsZF can review the part number and documentation before quotation.
Part-Number Summary
Use ZF number 4646.356.009 when sending your RFQ. PartsZF can review dotted, spaced, and compact number formats against the available product and documentation records.
Application Context
- Illustration section: POWER TAKE OFF
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 | 4646.356.009 |
|---|---|
| Normalized SKU | 4646356009 |
| Part name | HELICAL 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 4143.142.013 GEAR SHIFT SENSOR
- ZF 4143.142.022 GEAR SHIFT SENSOR
