Overview
The ZF 4644.308.299 SPUR GEAR is a precision-engineered component designed for the auxiliary drive train within the WG180 and WG200 series transmissions. This OEM genuine part transfers rotational force from the input shaft to the oil pump and PTO (power take-off) system, ensuring consistent hydraulic pressure and auxiliary power delivery. The SKU 4644.308.299 is machined from case-hardened alloy steel to withstand high torque loads and continuous operation in heavy-duty industrial applications. It sits directly on the intermediate shaft, meshing with the main drive gear to synchronize transmission lubrication and external equipment operation.
Symptoms of Failure
- Whining or grinding noise from the transmission housing: When the spur gear teeth wear unevenly, audible metal-on-metal sounds occur during acceleration or deceleration, often mistaken for bearing failure.
- Erratic PTO engagement or slipping: A worn 4644.308.299 gear causes inconsistent power take-off performance, leading to sudden disengagement or failure to hold load under stress.
- Low hydraulic pressure warnings: As gear tooth profile degrades, oil pump speed fluctuates, triggering pressure drop alerts on the dashboard or control unit.
- Metal particles in transmission fluid: Flaking or pitting on the spur gear deposits ferrous debris in the oil pan, detectable during routine fluid analysis or filter inspection.
Technical Specifications
| Part Number | 4644.308.299 |
| Material | Case-hardened alloy steel (20MnCr5 equivalent) |
| Number of Teeth | 29 |
| Module | 4.5 |
| Outer Diameter | 139.5 mm |
| Bore Diameter | 35 mm (spline fit) |
| Face Width | 32 mm |
| Weight | 1.85 kg |
| OEM Reference | ZF 4644.308.299 |
| Hardness | 58-62 HRC (case depth 0.8-1.2 mm) |
Compatibility
This spur gear is engineered for the ZF WG180 and WG200 series transmissions, including all sub-variants (WG180, WG180C, WG200, WG200C). It is a direct replacement for the original equipment installed in these models. The gear interfaces with the TRANSMISSION HOUSING and the HOUSING assembly, requiring precise alignment during installation. For proper identification, always verify the TYPE PLATE on your transmission to confirm model compatibility. The gear is secured using a GROOVED STUD to prevent axial movement under load.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644101208 | TRANSMISSION HOUSING | Main structural casing that encloses the gear train |
| 4644301333 | HOUSING | Intermediate housing supporting the spur gear shaft |
| 0730365125 | TYPE PLATE | Identification plate for transmission model verification |
| 0631311009 | GROOVED STUD | Fastener securing the spur gear to the shaft |
| 0636305019 | SCREW PLUG | Seals oil passages in the housing |
| 4644301247 | THREADED BUSH | Provides threaded mounting point for sensors |
| 0634303485 | O-RING | Seals the housing joint against oil leaks |
| 4644301257 | ADAPTER | Connects the gear to the PTO output flange |
| 0634306023 | O-RING | Secondary seal for the adapter interface |
| 4644106231 | SHIFT SYSTEM | Controls gear engagement and PTO activation |
ZF 4644.308.299 SPUR GEAR – Gear RFQ Support
ZF 4644.308.299 SPUR 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 4644.308.299 when sending your RFQ. PartsZF can review dotted, spaced, and compact number formats against the available product and documentation records.
Application Context
- Illustration section: CLUTCH
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 | 4644.308.299 |
|---|---|
| Normalized SKU | 4644308299 |
| 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.
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