Overview
This ZF 0730.109.557 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 bearing assemblies, this hardened steel washer ensures correct preload on rotating elements. The SKU 0730.109.557 directly corresponds to ZF’s factory specification for maintaining gear mesh accuracy under extreme torque loads. When installed alongside the 5838109012: DIFFERENTIAL, it prevents unwanted lateral movement that accelerates component fatigue.
Symptoms of Failure
- Transmission oil seepage at axle housing seals – Worn washer thickness reduces bearing preload, allowing shaft wobble that compromises seal integrity. Search “ZF transmission axle seal leak repair” for related diagnostics.
- Intermittent gear slipping under load – When the 0730.109.557 loses its dimensional tolerance, the 0750117075: TAPER ROLLER BEARING cannot maintain proper roller contact, leading to momentary torque loss during excavation cycles.
- Metallic grinding noise during deceleration – Excessive end-play from a collapsed washer allows gear teeth to contact housing walls. Operators often report this as “ZF transmission whine when slowing down.”
- Increased differential housing temperature – Friction from misaligned components generates heat, detectable via infrared thermometer on the 5838300626: DIFFERENTIAL HOUSING.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 0730.109.557 |
| Material | Case-hardened alloy steel (DIN 1.7131) |
| Outer Diameter | 68.0 mm |
| Inner Diameter | 42.5 mm |
| Thickness | 2.50 mm (selective fit) |
| Weight | 0.045 kg |
| OEM Reference | ZF 0730.109.557 |
| Hardness | 58-62 HRC |
Compatibility
This washer is integral to ZF WG-series powershift transmissions used in wheel loaders, graders, and excavators. Confirmed compatible models include WG180, WG200, WG210, and WG240 series. It also appears in select ZF 4WG-310 and 6WG-260 transfer cases. Always verify clearance requirements when pairing with the 2093209023: DIFFERENTIAL assembly, as shim stack adjustments may be needed.
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 and lubricant |
| 0631329088 | SPRING PIN | Secures shift fork alignment |
| 5838300811 | THRUST WASHER | Controls axial play in planetary sets |
| 5838300721 | AXLE BEVEL GEAR | Transfers power to wheel hubs |
| 5838300633 | AXLE | Rotates with differential side gears |
| 5838300753 | THRUST WASHER | Reduces friction on gear faces |
| 5838300818 | THRUST WASHER | Adjusts clearance in final drive |
Frequently Asked Questions
Q: Can I reuse the 0730.109.557 washer during a rebuild?
No. This is a single-use selective shim. Its thickness is calibrated to factory tolerances; reusing it risks improper preload on the taper roller bearing and differential assembly.
Q: How do I measure if this washer is the correct thickness for my ZF WG200?
Use a micrometer to measure the gap between the bearing outer race and housing shoulder after installing the differential. The 0730.109.557 should fill this gap with 0.05-0.10 mm of interference.
Q: Does this part fit ZF 4WG-260 transmissions?
Yes, but verify your housing variant. Some 4WG-260 units use a 2.30 mm washer; the 0730.109.557 at 2.50 mm may require pairing with a thinner thrust washer from the related components table.
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