Overview
The ZF 0730.301.112 WASHER is an OEM genuine shim component engineered for precise axial clearance control within heavy-duty construction machinery transmissions. This hardened steel washer sits between planetary gear sets and the differential housing assembly, ensuring correct preload on rotating elements. As a critical load-spreading interface, the SKU 0730.301.112 prevents metal-to-metal contact between the 5838109009: DIFFERENTIAL and adjacent thrust surfaces. Its exacting thickness tolerance directly influences gear mesh patterns and overall transmission longevity in ZF drivelines.
Symptoms of Failure
- Transmission oil seepage at axle housing seals — A worn 0730.301.112 washer allows excessive axial play, distorting the 5838300626: DIFFERENTIAL HOUSING seal surface and causing gradual fluid loss.
- Intermittent gear slipping under load — Reduced washer thickness alters preload on the 0750117075: TAPER ROLLER BEARING, leading to momentary torque loss during excavation or grading operations.
- Metallic grinding noise from differential area — Flattened or cracked washers permit the 2093209023: DIFFERENTIAL gears to contact housing walls, producing distinct high-pitched sounds during turns.
- Increased backlash in final drive — Measurable rotational play at the wheel hub indicates cumulative washer wear, often accompanied by vibration at 15-25 mph.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 0730.301.112 |
| Material | Case-hardened alloy steel (SAE 8620 equivalent) |
| Outer Diameter | 72.0 mm |
| Inner Diameter | 52.5 mm |
| Thickness | 2.50 mm ± 0.05 mm |
| Hardness | 58-62 HRC |
| Weight | 0.045 kg |
| OEM Reference | ZF 0730.301.112 |
Compatibility
This genuine ZF washer is primarily specified for the WG180, WG200, and WG250 series power-shift transmissions found in wheel loaders, graders, and telehandlers. It also applies to certain ZF 4WG-200 and 6WG-250 off-highway drivetrains. Always verify the washer thickness against your service manual, as selective fitment may require adjacent 5838300811: THRUST WASHER variants for precise stack-up.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 5838109009 | DIFFERENTIAL | Distributes torque between drive axles |
| 0750117075 | TAPER ROLLER BEARING | Supports radial and axial loads on differential shaft |
| 2093209023 | DIFFERENTIAL | Secondary differential unit for multi-axle configurations |
| 5838300626 | DIFFERENTIAL HOUSING | Encloses differential gear set and bearings |
| 0631329088 | SPRING PIN | Secures washer alignment during assembly |
| 5838300811 | THRUST WASHER | Provides axial bearing surface for planetary gears |
| 5838300721 | AXLE BEVEL GEAR | Transfers power from differential to axle shafts |
| 5838300633 | AXLE | Drives wheel hubs from differential output |
| 5838300753 | THRUST WASHER | Controls end-play in bevel gear sets |
| 5838300818 | THRUST WASHER | Compensates for thermal expansion in final drive |
Frequently Asked Questions
Q: Can I reuse the 0730.301.112 washer during a transmission rebuild?
No. ZF specifies single-use installation for this washer due to compression set and surface work-hardening. Always replace with a new OEM genuine part to maintain proper preload.
Q: How do I measure if my current washer has worn beyond tolerance?
Use a micrometer at three points around the circumference. If thickness measures below 2.40 mm at any point, or if visible scoring exceeds 0.1 mm depth, replacement is required.
Q: Will this washer fit ZF 4WG-180 transmissions from 1998-2005?
Yes, the 0730.301.112 is backward-compatible with early WG180 series units, though you should verify the differential housing part number matches the 5838300626 revision level for your specific build date.
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