Overview
The ZF 0735.321.290 Axial Roller Ring is a precision-engineered component designed to manage axial thrust loads within the planetary gear sets of heavy-duty construction machinery transmissions. This OEM genuine part sits directly between the rotating gear assemblies and the stationary housing, ensuring smooth load distribution and minimal frictional wear during high-torque operations. The SKU 0735.321.290 is critical for maintaining proper gear alignment and preventing metal-to-metal contact in ZF drivelines. When installed alongside the 5838109012: DIFFERENTIAL, this axial roller ring helps stabilize the entire differential carrier assembly under extreme loads.
Symptoms of Failure
- Transmission whining noise under load: A high-pitched metallic whine during acceleration or uphill operation often indicates a worn axial roller ring, allowing gear teeth to misalign.
- Intermittent gear slipping in forward gears: When the roller ring loses its dimensional integrity, the planetary gears can momentarily lose engagement, causing sudden RPM surges.
- Metallic debris in transmission oil: Flakes or fine metallic particles found during oil changes are a direct sign that the roller ring surface is spalling or delaminating.
- Excessive axial play at the output shaft: A measurable end-float of more than 0.5mm at the flange indicates the roller ring can no longer contain thrust forces.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 0735.321.290 |
| Outer Diameter | 145 mm |
| Inner Diameter | 110 mm |
| Thickness | 18.5 mm |
| Material | Case-hardened 20MnCr5 steel |
| Weight | 0.85 kg |
| OEM Reference | ZF 0735.321.290 |
Compatibility
This axial roller ring is engineered for ZF WG180, WG200, and WG250 series transmissions commonly found in wheel loaders, graders, and compactors. It is also compatible with select ZF Ecolife and PowerShift models used in construction machinery. For complete differential rebuilds, pair this ring with the 0750117075: TAPER ROLLER BEARING and the 2093209023: DIFFERENTIAL to ensure proper preload and gear mesh. The 5838300626: DIFFERENTIAL HOUSING provides the necessary structural enclosure for these components.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 5838109012 | DIFFERENTIAL | Distributes torque to drive axles |
| 0750117075 | TAPER ROLLER BEARING | Supports radial and axial loads |
| 2093209023 | DIFFERENTIAL | Secondary differential for multi-axle systems |
| 5838300626 | DIFFERENTIAL HOUSING | Encloses differential gears and bearings |
| 0631329088 | SPRING PIN | Secures gear alignment during assembly |
| 5838300811 | THRUST WASHER | Reduces axial friction between gears |
| 5838300721 | AXLE BEVEL GEAR | Transfers power to wheel hubs |
| 5838300633 | AXLE | Rotates to drive wheels |
| 5838300753 | THRUST WASHER | Controls end-play in planetary sets |
| 5838300818 | THRUST WASHER | Provides wear surface for sun gears |
Frequently Asked Questions
Q: Can I reuse the axial roller ring if it looks clean?
A: No. ZF recommends replacing the 0735.321.290 ring during any transmission overhaul. Even minor surface wear can alter preload and cause premature failure of the 0750117075: TAPER ROLLER BEARING.
Q: How do I verify correct installation orientation?
A: The ring has a chamfered inner edge that must face the gear side. Installing it reversed will block oil flow and cause rapid overheating. Always reference the ZF service manual for your specific transmission model.
Q: What torque specifications apply to the retaining hardware?
A: For the differential housing bolts that secure this ring, use 180 Nm with thread locker. Over-torquing can distort the ring raceway. Always replace the 0631329088: SPRING PIN simultaneously to ensure proper alignment.
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Phone: +86 158 2286 3467 |
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