Overview
The ZF 4660.233.003 SYNCHRONIZER is a critical internal component engineered for the WG200 and WG92 series transmissions. This OEM genuine part ensures smooth gear engagement by matching shaft speeds before a shift occurs, reducing wear on gear teeth and clutch packs. Located within the transmission’s main shaft assembly, the synchronizer (SKU: 4660.233.003) directly interfaces with the 4660198001 PERIPHERALS kit to maintain consistent hydraulic pressure during shifts. Its precision-ground surfaces and hardened steel construction are designed to withstand high-torque applications in commercial vehicles and industrial machinery.
Symptoms of Failure
- Grinding noise during gear changes: A worn 4660.233.003 synchronizer causes audible grinding when shifting, particularly under load, indicating the cone surfaces can no longer match rotational speeds.
- Gear slipping or popping out of engagement: As the synchronizer hub wears, the transmission may unexpectedly slip out of gear, especially in higher ranges of the WG200 series.
- Hard shifting or blocked gear engagement: Operators often report difficulty moving the shift lever into position, requiring excessive force due to degraded synchronizer friction material.
- Delayed engagement after clutch release: A failing synchronizer creates a noticeable lag between clutch pedal release and gear engagement, often mistaken for clutch issues.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 4660.233.003 |
| Material | Hardened alloy steel with sintered bronze friction cone |
| Weight | 1.85 kg (4.08 lbs) |
| Outer Diameter | 120 mm |
| Inner Diameter | 65 mm |
| Height | 42 mm |
| OEM Reference | ZF 4660 233 003 |
| Operating Temperature Range | -40°C to +120°C |
Compatibility
This synchronizer is specifically designed for ZF WG200 and WG92 series transmissions, including models such as the WG180, WG200, WG92, and WG150. It is a direct replacement for the original equipment part in both on-highway trucks and off-highway industrial applications. The 4660.233.003 works in conjunction with the 0501209818 RANGE SELECTOR to control shift timing, and it mounts inside the 4660101011 TRANSMISSION HOUSING. For complete rebuilds, ensure the 4660301018 HOUSING is inspected for wear at the synchronizer bore.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4660198001 | Peripherals | Hydraulic control kit for shift timing |
| 0501209818 | Range Selector | Pneumatic shift actuator for high/low range |
| 4660101011 | Transmission Housing | Main structural casing for gear train |
| 4660301018 | Housing | Secondary housing for synchronizer assembly |
| 0631306174 | Cylindrical Pin | Alignment pin for synchronizer hub |
| 0769123894 | Type Plate | Identification label for transmission model |
| 4660221012 | Suction Tube | Oil pickup tube for lubrication system |
| 0634100317 | O-Ring | Seal for hydraulic pressure ports |
| 0636103273 | Cap Screw | Fastener for synchronizer retaining plate |
| 0750100022 | Screw Plug | Drain or fill plug for transmission housing |
