Overview
The ZF 4644.308.615 Idler Gear is a critical component within the WG 180 series transmission, functioning as a torque distribution element between the input and output shafts. This OEM genuine part ensures precise gear meshing and load sharing across the planetary gearset, directly influencing driveline smoothness and power transfer efficiency. The SKU 4644.308.615 is engineered to ZF’s exacting tolerances, reducing vibration and noise in heavy-duty industrial applications. When paired with a robust 4644101223: TRANSMISSION HOUSING or the 4644301225: TRANSMISSION HOUSING, this idler gear maintains optimal alignment and longevity under sustained loads.
Symptoms of Failure
- Whining or grinding noise during gear engagement: A worn idler gear produces a distinct metallic whine, especially under load, indicating tooth surface degradation or pitting.
- Erratic power delivery or gear slipping: As the idler gear loses its tooth profile, torque transfer becomes inconsistent, leading to momentary slippage during acceleration or hill climbs.
- Metallic debris in transmission fluid: Flaking or chipped gear teeth contaminate the oil, often visible as glitter-like particles during routine fluid changes.
- Increased operating temperature: Excessive friction from a damaged idler gear generates heat, potentially causing thermal stress on adjacent components like the 4644301298: COVER PLATE.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4644.308.615 |
| Gear Type | Idler (Intermediate) |
| Material | Case-hardened alloy steel (20MnCr5 equivalent) |
| Outside Diameter | ~120 mm |
| Tooth Count | 32 teeth (estimated) |
| Weight | ~1.8 kg |
| OEM Reference | ZF 4644.308.615 |
| Surface Hardness | 58-62 HRC |
Compatibility
This idler gear is primarily designed for the ZF WG 180 series transmission, commonly found in off-highway trucks, wheel loaders, and heavy-duty material handlers. It also fits select variants of the WG 200 series where the intermediate gear cluster shares the same tooth geometry and shaft spacing. Always verify the transmission serial number and consult the 0730365125: TYPE PLATE for exact model identification. For sealing integrity, pair this gear with a fresh 0634306525: O-RING and 0636305026: SCREW PLUG during reassembly.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644101223 | TRANSMISSION HOUSING | Encloses and supports gear train |
| 4644301225 | TRANSMISSION HOUSING | Alternate housing for WG180 series |
| 0730365125 | TYPE PLATE | Identification and model verification |
| 4644301298 | COVER PLATE | Seals access opening, retains lubricant |
| 0634306525 | O-RING | Hydraulic seal between components |
| 0636305026 | SCREW PLUG | Closes oil drain/fill ports |
| 4644301279 | SCREEN SHEET | Filters debris from oil flow |
| 4644301088 | SEALING CAP | Prevents contamination ingress |
| 4644106201 | SHIFT SYSTEM | Controls gear selection mechanism |
| 4644306470 | GASKET | Seals mating surfaces against leaks |
ZF 4644.308.615 IDLER GEAR – Gear RFQ Support
ZF 4644.308.615 IDLER 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 4644.308.615 when sending your RFQ. PartsZF can review dotted, spaced, and compact number formats against the available product and documentation records.
Application Context
- Illustration section: COUNTERSHAFT
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 | 4644.308.615 |
|---|---|
| Normalized SKU | 4644308615 |
| Part name | IDLER 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
