Overview
The ZF 4660.251.007 TAPERED ROLLER BEARING is a critical load-bearing component engineered specifically for the planetary gear sets within the WG 92, WG 98, and WG 200 series transmissions. This OEM genuine part (SKU: 4660.251.007) manages both radial and axial thrust loads generated during gear shifts and torque multiplication. Positioned between the sun gear and the planetary carrier, this bearing ensures precise rotational alignment and reduces frictional heat buildup. When paired with a properly sealed TRANSMISSION HOUSING, the 4660.251.007 maintains the tight clearances required for sustained high-torque operation in heavy-duty industrial applications.
Symptoms of Failure
- Audible grinding or whining noise during gear engagement: Worn tapered rollers create metal-on-metal contact, producing a distinct high-pitched sound that intensifies under load.
- Excessive axial play in the output shaft: As the bearing races degrade, measurable end-play develops, causing driveline vibration and uneven tire wear on mobile equipment.
- Metallic debris in transmission fluid: Flaking or spalling of the roller surfaces contaminates the oil, often visible as glittering particles during routine drain intervals.
- Overheating near the planetary assembly: Increased friction from a failing bearing elevates localized temperatures, potentially warping the HOUSING and adjacent components.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4660.251.007 |
| Bearing Type | Tapered Roller Bearing (single row) |
| Bore Diameter | 55 mm |
| Outer Diameter | 100 mm |
| Width (Overall) | 28 mm |
| Dynamic Load Rating | 125 kN |
| Static Load Rating | 160 kN |
| Material | Case-hardened 52100 bearing steel |
| Weight | 0.85 kg |
| OEM Reference | ZF 4660.251.007 |
Compatibility
This genuine ZF bearing is a direct replacement for transmissions in the WG 92, WG 98, and WG 200 series families. It is commonly found in the planetary output section of the WG 180 and WG 200 models, as well as the WG 92 and WG 98 variants used in material handling and construction equipment. The 4660.251.007 works in conjunction with the PERIPHERALS assembly and the RANGE SELECTOR mechanism to ensure smooth ratio changes. Always verify the bearing race condition within the transmission housing before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4660198001 | PERIPHERALS | Supports auxiliary power take-off and pump drives |
| 0501209818 | RANGE SELECTOR | Controls high/low range engagement |
| 4660101011 | TRANSMISSION HOUSING | Encloses planetary gear sets and bearings |
| 4660301018 | HOUSING | Provides structural support for clutch packs |
| 0631306174 | CYLINDRICAL PIN | Aligns bearing races during assembly |
| 0769123894 | TYPE PLATE | Identifies transmission model and serial number |
| 4660221012 | SUCTION TUBE | Delivers oil to the pump inlet |
| 0634100317 | O-RING | Seals fluid passages between components |
| 0636103273 | CAP SCREW | Secures bearing retainers to the housing |
| 0750100022 | SCREW PLUG | Closes inspection ports on the housing |
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