Overview
The ZF 4644.163.400 SPUR GEAR DRIVE is a precision-engineered component designed for the WG 181 series transmission. This gear drive is responsible for transferring rotational force from the input shaft to the auxiliary drive system, ensuring smooth power distribution within the transmission assembly. As an OEM genuine part, SKU 4644.163.400 guarantees exact fitment and durability, reducing the risk of premature wear. It sits directly within the gear train, meshing with the main shaft to support both forward and reverse operations in heavy-duty industrial applications.
Symptoms of Failure
- Whining or grinding noise during gear engagement: A worn spur gear drive often produces a high-pitched whine or metallic grinding sound, especially when shifting under load. This indicates tooth surface degradation or misalignment.
- Intermittent power loss or gear slipping: If the gear drive teeth are chipped or worn unevenly, you may experience sudden loss of torque or slipping during acceleration, a common issue in WG 181 transmissions.
- Metallic debris in transmission fluid: Visible metal particles or sludge in the oil pan signal that the spur gear drive is shedding material, often accompanied by reduced hydraulic pressure.
- Vibration through the drivetrain: Excessive vibration at specific RPM ranges suggests the gear drive has developed uneven wear patterns or has lost its original balance.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | 4644.163.400 |
| OEM Reference | ZF 4644.163.400 |
| Material | Case-hardened alloy steel (16MnCr5) |
| Weight | 2.85 kg (6.28 lbs) |
| Outer Diameter | 118 mm |
| Bore Diameter | 25 mm |
| Tooth Count | 32 teeth |
| Module | 3.5 mm |
| Surface Hardness | 58-62 HRC |
Compatibility
This spur gear drive is primarily engineered for the ZF WG 181 series transmission. It is also compatible with the ZF WG 180 and WG 200 series models, as these share the same gear train architecture and mounting dimensions. The part is not suitable for WG 150 or WG 250 series without modification. Always verify your transmission model number against the OEM part list before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644101047 | TRANSMISSION HOUSING | Encloses and supports all internal gears and shafts |
| 4644301380 | HOUSING | Secondary housing for auxiliary drive components |
| 4644301189 | THREADED BUSH | Provides threaded mounting point for gear drive retention |
| 0730365067 | TYPE PLATE | Identification plate with transmission model and serial number |
| 0631311009 | GROOVED STUD | Alignment stud for precise gear drive positioning |
| 4644301161 | COVER PLATE | Seals the gear drive access opening |
| 0636100621 | HEXAGON SCREW | Fastener for securing the gear drive to the shaft |
| 0631610020 | SET SCREW | Locks the gear drive in place on the shaft |
| 0634801098 | SEALING RING | Prevents oil leakage around the gear drive bore |
| 4644301117 | FIXING PLATE | Retains the gear drive axially within the housing |
ZF 4644.163.400 SPUR GEAR DRIVE – Gear RFQ Support
Use ZF 4644.163.400 SPUR GEAR DRIVE as the reference when requesting gear support. Photos, visible markings, and transmission context help reduce sourcing uncertainty.
Part-Number Summary
Use ZF number 4644.163.400 when sending your RFQ. PartsZF can review dotted, spaced, and compact number formats against the available product and documentation records.
Application Context
- Illustration section: SPUR GEAR DRIVE
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 | 4644.163.400 |
|---|---|
| Normalized SKU | 4644163400 |
| Part name | SPUR GEAR DRIVE |
| 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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