Overview
The ZF 4112.303.216 WASHER is a precision-engineered OEM genuine component designed specifically for the WG190 and WG210 series transmissions. This hardened steel washer functions as a critical load-spreading element between mating surfaces, ensuring proper axial clearance and preventing fretting wear within the clutch and planetary gear assemblies. As part number 4112.303.216, it is installed directly against the 4143101009: HOUSING to maintain correct end-play tolerances. Without this washer, metal-to-metal contact accelerates component fatigue and compromises shift quality.
Symptoms of Failure
- Transmission oil seepage at housing joints: A worn 4112.303.216 washer allows the 4143301025: HOUSING to shift slightly, breaking the seal and causing slow fluid loss.
- Intermittent gear slipping under load: When this washer compresses beyond specification, clutch pack clearance increases, leading to delayed engagement and torque loss.
- Metallic debris in transmission fluid: A fractured washer sheds fine steel particles into the oil, which can clog the valve body and damage the 0634313603: O-RING sealing surfaces.
- Abnormal driveline vibration: Excessive axial play from a collapsed washer creates harmonic imbalance, particularly during low-speed maneuvering.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4112.303.216 |
| Material | Case-hardened carbon steel (DIN 1.0402 equivalent) |
| Outer Diameter | 42.0 mm |
| Inner Diameter | 28.5 mm |
| Thickness | 2.0 mm |
| Weight | 12 grams |
| Surface Hardness | HRC 58-62 |
| OEM Reference | ZF 4112.303.216 |
Compatibility
This washer is a direct-fit OEM replacement for ZF WG190 and WG210 series transmissions. It is also commonly used in the WG180, WG200, and WG220 variants where the same planetary carrier stack height applies. Always verify clearance when pairing this washer with a replacement 4475280018: SCREW PLUG to ensure proper preload.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4143101009 | HOUSING | Encloses clutch drum assembly |
| 4143301025 | HOUSING | Rear support housing for output shaft |
| 0634313603 | O-RING | Seals housing-to-case interface |
| 4475280018 | SCREW PLUG | Closes oil gallery access port |
| 0501342341 | SUPPORT RING | Reinforces washer seating area |
| 4143298457 | SEAL KIT | Complete overhaul gasket set |
| 0634313591 | O-RING | Seals piston feed tube |
| 0636101068 | CAP SCREW | Fastens housing to bell housing |
| 4143221013 | THROTTLE VALVE | Modulates shift pressure |
| 0634304484 | O-RING | Seals valve body cover |
Frequently Asked Questions
Q: Can I reuse the 4112.303.216 washer during a rebuild?
A: ZF recommends always replacing this washer with a new OEM unit. The hardened steel work-hardens during initial torque cycles, and reusing it risks improper clearance and premature failure of the adjacent 4143101009: HOUSING.
Q: What torque specification applies to the screw plug near this washer?
A: The 4475280018: SCREW PLUG should be torqued to 35 Nm when installed with a new 4112.303.216 washer. Over-torquing can distort the washer and cause oil leaks.
Q: Does this washer fit the ZF WG180 transmission?
A: Yes. The 4112.303.216 is dimensionally identical to the washer used in WG180, WG200, and WG220 models. Always cross-reference your transmission serial number with the OEM parts catalog.
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