Overview
The ZF 0730.301.090 WASHER is an OEM genuine shim component engineered for precision load distribution within heavy-duty construction machinery transmissions. This hardened steel washer sits between planetary gear sets and housing shoulders, maintaining critical axial clearances in ZF driveline assemblies. As a factory-spec part, the SKU 0730.301.090 ensures exacting tolerances to prevent metal-on-metal contact during high-torque operations. When installed alongside the 5838109012: DIFFERENTIAL, it stabilizes the gear stack against thrust loads, directly influencing shift quality and component longevity.
Symptoms of Failure
- Transmission oil leaks at housing seams – A worn 0730.301.090 washer allows the differential housing to shift, breaking seal integrity. This often appears as wet streaks near the PTO cover on ZF WG series units.
- Intermittent gear slipping under load – When the washer thickness degrades, axial play increases, causing the 0750117075: TAPER ROLLER BEARING to lose preload. Operators report a momentary loss of drive torque when climbing grades.
- Metallic grinding noise from the differential area – A collapsed washer permits the 2093209023: DIFFERENTIAL to contact the housing wall, producing a distinct high-pitched screech during turns.
- Vibration through the driveline at 40-50 km/h – Uneven washer wear creates a harmonic imbalance, felt as a rhythmic shudder in the cab floorboards.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | 0730.301.090 |
| Material | Hardened Carbon Steel (DIN 1.1210) |
| Inner Diameter | 90.0 mm |
| Outer Diameter | 120.0 mm |
| Thickness | 2.5 mm |
| Weight | 0.18 kg |
| OEM Reference | ZF 0730.301.090 |
| Hardness Rating | HRC 45-50 |
Compatibility
This washer is a direct fit for ZF WG180, WG200, and WG250 series transmissions commonly used in wheel loaders, graders, and telehandlers. It also applies to select ZF Ecomat 4HP and 5HP models where the 5838300626: DIFFERENTIAL HOUSING is present. Always verify the axial clearance specification for your specific transmission variant before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 5838109012 | DIFFERENTIAL | Distributes torque between axles |
| 0750117075 | TAPER ROLLER BEARING | Supports radial and axial loads |
| 2093209023 | DIFFERENTIAL | Secondary torque split unit |
| 5838300626 | DIFFERENTIAL HOUSING | Encloses gear set |
| 0631329088 | SPRING PIN | Secures shift fork alignment |
| 5838300811 | THRUST WASHER | Reduces axial friction |
| 5838300721 | AXLE BEVEL GEAR | Transfers power to wheel hubs |
| 5838300633 | AXLE | Rotational drive shaft |
| 5838300753 | THRUST WASHER | Controls end-play in planetary sets |
| 5838300818 | THRUST WASHER | Secondary axial clearance shim |
Frequently Asked Questions
Q: Can I reuse the ZF 0730.301.090 washer during a rebuild?
A: No. This is a single-use crush washer that deforms during initial torque application. Always replace it with a new OEM part to maintain proper preload on the taper roller bearing assembly.
Q: Will a worn washer cause differential overheating?
A: Yes. Excessive axial play from a degraded 0730.301.090 forces the differential gears to run out of alignment, generating excess heat that can degrade transmission fluid viscosity.
Q: How do I confirm the correct washer thickness for my ZF transmission?
A: Measure the existing stack clearance with a dial indicator. The 0730.301.090 (2.5 mm) is standard for WG200 series; for WG250 units, you may need a 3.0 mm variant. Always consult your transmission’s service manual.
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