Overview
The ZF 4657.354.043 OUTPUT GEAR is a critical power-transfer component engineered specifically for the WG210 series transmission. This OEM genuine part sits at the rear of the planetary gearset, directly engaging the output shaft to transmit torque from the transmission to the driveline. Precision-machined from high-strength alloy steel, the SKU 4657.354.043 ensures minimal backlash and maximum durability under heavy-duty industrial loads. When installed alongside the TRANSMISSION HOUSING, this output gear forms the final mechanical link in the power flow path, making its integrity essential for reliable vehicle operation.
Symptoms of Failure
- Whining or howling noise during deceleration: Worn gear teeth on the 4657.354.043 produce a distinct metallic whine that intensifies when the vehicle coasts or slows down, often mistaken for differential noise.
- Intermittent gear slipping under load: As the output gear loses tooth profile, the transmission may momentarily lose engagement during uphill climbs or heavy towing, causing a sudden RPM flare.
- Metal particles in transmission fluid: Flaking or pitting on the gear surface introduces fine steel debris into the oil, visible during routine fluid changes as a glittering or magnetic sludge.
- Vibration at highway speeds: Uneven wear on the output gear creates rotational imbalance, transmitting a low-frequency shudder through the chassis at speeds above 40 mph.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | 4657.354.043 |
| Material | Case-hardened alloy steel (20MnCr5 equivalent) |
| Outside Diameter | 168 mm |
| Tooth Count | 42 teeth (helical) |
| Weight | 4.2 kg |
| OEM Reference | ZF 4657.354.043 |
| Heat Treatment | Carburized & tempered to HRC 58-62 |
Compatibility
This output gear is primarily designed for the ZF WG210 series, but it also fits select variants of the WG180 and WG200 transmissions due to shared planetary carrier dimensions. It is compatible with the HOUS.FRONT SECT and HOUSING REAR PART found in WG210 assemblies. For proper installation, always pair this gear with a new CYLINDRICAL PIN to secure the gear to the output shaft. Additional compatible models include WG211, WG212, and WG213, all of which use the same 42-tooth helical gear geometry.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101034 | TRANSMISSION HOUSING | Main structural casing for gearset |
| 4657201027 | HOUS.FRONT SECT | Front section housing for input shaft |
| 4657201012 | HOUSING REAR PART | Rear housing supporting output gear |
| 0631306792 | CYLINDRICAL PIN | Alignment pin for gear-to-shaft fit |
| 0636100801 | CAP SCREW | Fastener for housing assembly |
| 4656301148 | FIXING PLATE | Locks gear axial position |
| 4657301032 | SCREEN SHEET | Filter screen for oil circuit |
| 4657301033 | SCREEN SHEET | Secondary filter screen |
| 0636100803 | CAP SCREW | Bolt for rear housing |
| 4681301040 | OIL FEED.HOUSG. | Oil distribution housing |
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