Overview
The ZF 4660.251.012 ROLLER BEARING is a critical rotating component engineered for the planetary gear sets within ZF WG200, WG92, WG94, and WG98 series transmissions. This OEM genuine part reduces friction between the sun gear and the planetary carrier, ensuring smooth torque transfer and load distribution under high-stress conditions. The SKU 4660.251.012 is precision-machined to maintain exact axial and radial clearances, directly influencing shift quality and overall drivetrain efficiency. When installed alongside the 4660198001 PERIPHERALS kit, this bearing supports the entire clutch pack assembly, while the 0501209818 RANGE SELECTOR controls the gear engagement that this bearing facilitates.
Symptoms of Failure
When the 4660.251.012 roller bearing begins to degrade, operators will notice distinct operational issues. 1. Low-frequency growling or rumbling noise from the transmission housing, particularly in first or reverse gear, indicates spalling on the bearing raceways. 2. Intermittent gear slipping under load occurs as the bearing loses its ability to maintain proper gear mesh alignment. 3. Metallic debris in the transmission fluid is a clear sign of bearing cage or roller fracture. 4. Increased operating temperature due to excessive friction, often accompanied by a burnt oil smell, signals imminent bearing failure. Ignoring these symptoms can lead to catastrophic damage to the 4660101011 TRANSMISSION HOUSING and the 4660301018 HOUSING assembly.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number / SKU | 4660.251.012 |
| Type | Cylindrical Roller Bearing |
| Inner Diameter (ID) | 55 mm (estimated) |
| Outer Diameter (OD) | 90 mm (estimated) |
| Width (W) | 23 mm (estimated) |
| Material | Case-hardened 100Cr6 bearing steel |
| Dynamic Load Rating (C) | 72.5 kN (estimated) |
| Static Load Rating (C0) | 48.0 kN (estimated) |
| Weight | 0.65 kg (1.43 lbs) |
| OEM Reference | ZF 4660.251.012 |
Compatibility
This ZF 4660.251.012 roller bearing is designed for direct fitment in the following ZF transmission model series: WG 200 Series (including WG200, WG210), WG 92 Series (WG92, WG94), WG 94 Series, and WG 98 Series. It is specifically used in the planetary carrier assembly of these heavy-duty off-highway transmissions. For proper installation, always replace the 0634100317 O-RING and verify the 0636103273 CAP SCREW torque specifications. The bearing also interfaces with the 0631306174 CYLINDRICAL PIN for precise alignment within the gearset.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4660198001 | PERIPHERALS | Clutch pack support and oil distribution |
| 0501209818 | RANGE SELECTOR | Gear engagement control valve |
| 4660101011 | TRANSMISSION HOUSING | Main structural casing |
| 4660301018 | HOUSING | Rear cover and bearing support |
| 0631306174 | CYLINDRICAL PIN | Bearing alignment dowel |
| 0769123894 | TYPE PLATE | Identification and specification label |
| 4660221012 | SUCTION TUBE | Oil pickup from sump |
| 0634100317 | O-RING | Hydraulic seal for bearing cavity |
| 0636103273 | CAP SCREW | Fastener for bearing retainer |
| 0750100022 | SCREW PLUG | Oil gallery sealing plug |
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