Overview
This genuine ZF 5838.300.603 BALL DISC is a critical internal component engineered for precision load distribution within the planetary gear sets of heavy-duty construction machinery transmissions. Positioned between rotating shafts and stationary housings, this OEM part ensures smooth torque transfer and reduces axial play during high-stress operations. The SKU 5838.300.603 is specifically designed to interface with the differential assembly, working in concert with the 5838109009: DIFFERENTIAL to maintain consistent gear mesh alignment under variable loads.
Symptoms of Failure
- Intermittent gear slippage under load – When the ball disc surface wears unevenly, the transmission may momentarily lose engagement during excavation or grading operations.
- Metallic grinding noise from the differential housing – A worn 5838.300.603 allows the 2093209023: DIFFERENTIAL to shift laterally, creating audible contact with surrounding components.
- Progressive oil contamination with metallic particles – Flaking material from a degraded ball disc circulates through the hydraulic system, often detected during routine oil analysis.
- Vibration in the driveline during low-speed maneuvers – Uneven ball surface wear causes cyclic loading on the 0750117075: TAPER ROLLER BEARING, translating into chassis vibration.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 5838.300.603 |
| Material | Case-hardened alloy steel (SAE 8620) |
| Outer Diameter | 72.0 mm |
| Inner Diameter | 38.0 mm |
| Thickness | 12.5 mm |
| Weight | 0.28 kg |
| Surface Hardness | 58-62 HRC |
| OEM Reference | ZF 5838.300.603 |
Compatibility
This ball disc is a direct replacement for ZF WG180, WG200, and WG250 series transmissions commonly found in wheel loaders, telehandlers, and graders. It also fits select models of the ZF 4WG-200 and 4WG-310 power shift transmissions. For proper installation, ensure the 5838300626: DIFFERENTIAL HOUSING is inspected for wear at the ball disc seating surface.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 5838109009 | DIFFERENTIAL | Distributes torque between drive wheels |
| 0750117075 | TAPER ROLLER BEARING | Supports radial and axial loads on shafts |
| 2093209023 | DIFFERENTIAL | Secondary differential for planetary gear sets |
| 5838300626 | DIFFERENTIAL HOUSING | Encloses differential gears and bearings |
| 0631329088 | SPRING PIN | Secures ball disc alignment during assembly |
| 5838300811 | THRUST WASHER | Reduces friction between rotating components |
| 5838300721 | AXLE BEVEL GEAR | Transfers power at 90-degree angle |
| 5838300633 | AXLE | Transmits rotational force to wheels |
| 5838300753 | THRUST WASHER | Controls axial clearance in gear sets |
| 5838300818 | THRUST WASHER | Provides wear surface for planetary gears |
Frequently Asked Questions
Q: Can the 5838.300.603 ball disc be reused after a transmission overhaul?
A: No. This component undergoes plastic deformation during service. Always replace it with a new OEM part to maintain proper preload on the differential assembly.
Q: What torque specification applies to the retaining bolt for this ball disc?
A: ZF specifies 85 Nm ±5 Nm for the M12 retaining bolt. Always use a new lock washer and apply thread locker (Loctite 243) to prevent loosening under vibration.
Q: How does a worn ball disc affect the taper roller bearing lifespan?
A: Excessive axial play from a degraded ball disc forces the 0750117075: TAPER ROLLER BEARING to operate outside its designed load angle, reducing bearing life by up to 60%.
📞 Need this part? Contact our ZF specialists:
Email: info@partszf.com |
Phone: +86 158 2286 3467 |
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