Overview
This ZF 0730.301.912 WASHER is an OEM genuine shim component engineered for precise axial clearance control within heavy-duty construction machinery transmissions. Positioned between planetary gear sets and the differential housing, this hardened steel washer prevents metal-to-metal contact while maintaining critical end-play tolerances. The SKU 0730.301.912 is specifically designed to withstand high axial loads and thermal expansion in ZF power shift transmissions, ensuring consistent gear mesh alignment during demanding excavation and loading operations.
Symptoms of Failure
- Transmission oil leaks at axle housing interface: A worn 0730.301.912 washer allows excessive clearance, causing seal distortion and fluid seepage around the 5838300626: DIFFERENTIAL HOUSING mating surface.
- Gear slipping under load during grading operations: Thinning of this washer reduces preload on the 0750117075: TAPER ROLLER BEARING, leading to intermittent torque loss in the differential assembly.
- Metallic grinding noise from transmission sump: When the washer fractures, debris contaminates the 5838109012: DIFFERENTIAL gear set, producing audible chatter during directional shifts.
- Increased backlash in final drive: Compromised washer thickness directly correlates with excessive play in the 2093209023: DIFFERENTIAL side gears, causing driveline vibration at low speeds.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 0730.301.912 |
| Material | Case-hardened alloy steel (DIN 1.7131) |
| Outer Diameter | 72.0 mm |
| Inner Diameter | 52.5 mm |
| Thickness | 2.5 mm (selective fit) |
| Weight | 0.045 kg |
| OEM Reference | ZF 0730.301.912 |
| Hardness | HRC 58-62 |
Compatibility
This washer is a standard shim component in ZF WG180, WG200, and WG310 series power shift transmissions used in wheel loaders, graders, and dozers. It also fits select ZF 4WG-200 and 6WG-310 models where differential preload adjustment is required. Always verify stack height when replacing alongside the 5838300811: THRUST WASHER or 5838300721: AXLE BEVEL GEAR.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 5838109012 | DIFFERENTIAL | Distributes torque to axle shafts |
| 0750117075 | TAPER ROLLER BEARING | Supports differential carrier rotation |
| 2093209023 | DIFFERENTIAL | Spider gear assembly for wheel speed differentiation |
| 5838300626 | DIFFERENTIAL HOUSING | Encloses differential gear set |
| 0631329088 | SPRING PIN | Secures washer alignment in housing bore |
| 5838300811 | THRUST WASHER | Absorbs axial thrust from bevel gear |
| 5838300721 | AXLE BEVEL GEAR | Transfers power to axle shafts |
| 5838300633 | AXLE | Drives wheel hub assembly |
| 5838300753 | THRUST WASHER | Spacer for differential side gears |
| 5838300818 | THRUST WASHER | Adjusts pinion gear depth |
Frequently Asked Questions
Q: Can I reuse the 0730.301.912 washer during a differential rebuild?
A: No. This is a selective-fit shim that deforms plastically under torque. Always replace with a new OEM washer to maintain proper bearing preload on the 0750117075: TAPER ROLLER BEARING.
Q: What is the torque specification for the differential housing bolts when installing this washer?
A: For ZF WG200 transmissions, tighten M12 bolts to 110 Nm + 90° turn. Always consult the service manual for the 5838300626: DIFFERENTIAL HOUSING.
Q: Does this washer fit ZF 4WG-310 models?
A: Yes, but verify stack height using the 5838300818: THRUST WASHER as a reference for correct end-play of 0.05-0.15 mm.
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