Overview
The ZF 4644.356.011 IDLER GEAR is a critical component within the WG 200 series transmission, specifically engineered to manage torque distribution and gear synchronization within the planetary gearset. This OEM genuine part, identified by SKU 4644.356.011, acts as an intermediate gear that transfers rotational force between the input shaft and the output shaft without altering the direction of rotation. Positioned within the main gear train, it ensures smooth power flow and reduces mechanical stress on adjacent components. When installed alongside the 4644105424 DISCONNECTION unit, this idler gear maintains precise alignment, preventing premature wear in the TRANSMISSION HOUSING.
Symptoms of Failure
- Whining or grinding noise during gear engagement: A worn 4644.356.011 idler gear produces a distinct high-pitched whine or metallic grinding sound, especially when shifting under load. This is often misdiagnosed as bearing failure.
- Intermittent gear slipping under torque: As the gear teeth wear unevenly, the transmission may momentarily lose power delivery, causing the vehicle to lurch or hesitate during acceleration.
- Metal debris in transmission fluid: Flaking or pitting on the idler gear surface introduces ferrous particles into the oil, which can clog the VALVE BLOCK and damage the SHIFT SYSTEM.
- Vibration at specific RPM ranges: A damaged idler gear creates harmonic vibrations that resonate through the OUTPUT FLANGE, often felt in the driveline at highway speeds.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 4644.356.011 |
| Material | Case-hardened alloy steel (20MnCr5 equivalent) |
| Tooth Count | 28 teeth (helical cut) |
| Outside Diameter | 142.5 mm |
| Bore Diameter | 45.0 mm |
| Face Width | 38.2 mm |
| Weight | 1.85 kg |
| OEM Reference | ZF 4644.356.011 (Genuine) |
| Heat Treatment | Carburized & tempered to HRC 58-62 |
Compatibility
This idler gear is primarily designed for the ZF WG200 series, but it also fits select WG180 and WG190 variants due to shared planetary carrier architecture. It is a direct replacement for transmissions used in medium-duty trucks, construction loaders, and agricultural tractors. For proper installation, ensure the HEXAGON SCREW torque values are observed when securing the gear to the shaft. Always pair this part with a new TRANSMISSION HOUSING gasket to prevent oil contamination.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644105424 | DISCONNECTION | Engages/disengages power flow to the idler gear |
| 4644303538 | OUTPUT FLANGE | Connects transmission to driveshaft |
| 0636021036 | HEXAGON SCREW | Secures idler gear to shaft |
| 4644101224 | TRANSMISSION HOUSING | Encloses gear train assembly |
| 4644301346 | TRANSMISSION HOUSING | Alternate housing variant for WG200 |
| 0730365067 | TYPE PLATE | Identification label for transmission model |
| 4644106300 | SHIFT SYSTEM | Controls gear selection mechanism |
| 4644306500 | COVER PLATE | Seals access opening to gear train |
| 4644159311 | SHIFT SYSTEM | Secondary shift actuator assembly |
| 4644306563 | VALVE BLOCK | Hydraulic control unit for clutch packs |
ZF 4644.356.011 IDLER GEAR – Gear RFQ Support
Use ZF 4644.356.011 IDLER GEAR as the reference when requesting gear support. Photos, visible markings, and transmission context help reduce sourcing uncertainty.
Part-Number Summary
Use ZF number 4644.356.011 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 | 4644.356.011 |
|---|---|
| Normalized SKU | 4644356011 |
| 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: diagram. 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
