Overview
The ZF 4644.306.546 THREADED BUSH is a precision-engineered component designed specifically for the WG 65 Series transmission. This OEM genuine part functions as a critical interface point within the gearbox housing, providing a durable threaded seat for securing hydraulic lines or sensor assemblies. The SKU 4644.306.546 is manufactured to exact ZF tolerances, ensuring a leak-proof seal and maintaining proper oil pressure within the transmission system. It is typically installed directly into the TRANSMISSION HOUSING and works in conjunction with the HEXAGON SCREW to anchor adjacent assemblies.
Symptoms of Failure
When the ZF 4644.306.546 threaded bush wears out, operators often notice distinct performance issues. Look for these specific failure symptoms:
- Oil seepage around the WG65 housing: A degraded bush allows transmission fluid to escape, leaving visible wet spots near the threaded port.
- Loose or vibrating sensor mounts: If the bush threads strip, attached components will wobble, causing erratic shift patterns or warning lights.
- Hard shifting or gear slippage under load: A compromised seal reduces hydraulic pressure, leading to delayed engagement in forward or reverse gears.
- Metallic debris in the oil pan: Worn bush material can shed particles, contaminating the fluid and accelerating wear on other internals.
Technical Specifications
| Part Number | 4644.306.546 |
| Material | Case-hardened steel with zinc-nickel plating |
| Thread Size | M18 x 1.5 (estimated) |
| Overall Length | 32 mm |
| Hex Flange Diameter | 24 mm |
| Weight | 0.045 kg |
| OEM Reference | ZF 4644.306.546 |
Compatibility
This threaded bush is primarily designed for the ZF WG65 transmission series, but it also fits select models within the broader WG family. Compatible transmissions include:
- ZF WG65
- ZF WG80 (with adapter housing)
- ZF WG120 (limited applications)
- ZF WG180 (when used with HOUSING part 4616301307)
- ZF WG200 (when paired with HOUSING part 4616301309)
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4616101066 | TRANSMISSION HOUSING | Main casing for gear assembly |
| 0636011118 | HEXAGON SCREW | Secures housing sections |
| 4616301307 | HOUSING | Intermediate housing adapter |
| 4616301309 | HOUSING | Rear housing cover |
| 0636011038 | HEXAGON SCREW | Fastener for valve body |
| 0636016015 | HEXAGON SCREW | High-torque mounting bolt |
| 0631306085 | CYLINDRICAL PIN | Alignment dowel for housings |
| 0634313118 | O-RING | Seals hydraulic passages |
| 0636304019 | SCREW PLUG | Closes unused ports |
| 0634801152 | SEALING RING | Prevents fluid bypass |
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