Overview
The ZF 4657.354.023 SLIDING SLEEVE is a critical synchronizer component engineered specifically for the WG210 series heavy-duty transmission. This OEM genuine part facilitates smooth gear engagement by sliding axially along the main shaft to lock the selected gear hub. As a wear-prone element in the shift mechanism, the SKU 4657.354.023 ensures precise alignment and torque transfer within the transmission assembly. It interfaces directly with the TRANSMISSION HOUSING and the HOUS.FRONT SECT, forming the core of the shift control system.
Symptoms of Failure
- Grinding or clashing noises during gear changes: A worn sliding sleeve fails to engage the gear teeth cleanly, producing audible metal-on-metal sounds. This often leads to “hard shifting” complaints in WG210 transmissions.
- Gear slippage under load: When the sleeve’s internal splines are stripped or rounded, the transmission can pop out of gear during acceleration, especially in higher gears.
- Intermittent engagement or “false neutrals”: The shift lever may feel loose or travel without engaging a gear, indicating the sliding sleeve is no longer locking the gear hub properly.
- Metallic debris in transmission oil: Wear particles from the sliding sleeve contaminate the lubricant, often visible during oil changes as fine steel shavings.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | 4657.354.023 |
| Material | Case-hardened alloy steel (16MnCr5) |
| Weight | 0.85 kg (1.87 lbs) |
| Internal Spline Count | 24 |
| Outer Diameter | 78.5 mm |
| Length | 42.3 mm |
| OEM Reference | ZF 4657.354.023 |
| Surface Treatment | Phosphate coating |
Compatibility
This sliding sleeve is primarily designed for the ZF WG210 series transmission. Based on its spline geometry and shift fork interface, it is also compatible with the WG180, WG200, and WG220 models. It works in conjunction with the HOUSING REAR PART and is secured by a CYLINDRICAL PIN that aligns the shift fork assembly. Always verify the shift fork width and hub diameter before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101033 | TRANSMISSION HOUSING | Encloses and supports all internal transmission components |
| 4657201027 | HOUS.FRONT SECT | Front section housing for input shaft and bearings |
| 4657201012 | HOUSING REAR PART | Rear housing section supporting output shaft assembly |
| 0631306792 | CYLINDRICAL PIN | Alignment pin for shift fork and sliding sleeve |
| 0636100801 | CAP SCREW | Fastener for securing housing sections |
| 4656301148 | FIXING PLATE | Retains shift mechanism components in position |
| 4657301032 | SCREEN SHEET | Oil filter screen for transmission lubrication system |
| 4657301033 | SCREEN SHEET | Secondary oil filter screen for fine debris |
| 0636100803 | CAP SCREW | High-tensile fastener for internal assemblies |
| 4681301040 | OIL FEED.HOUSG. | Distributes pressurized oil to bearings and gears |
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