Overview
The ZF 4660.271.006 ROLLER CAGE is a precision-engineered component designed to maintain proper roller alignment within the planetary gear sets of heavy-duty ZF transmissions. This OEM genuine part, identified by SKU 4660.271.006, sits directly between the sun gear and the planet gears in the WG92 and WG98 series, ensuring that each roller remains evenly spaced to distribute torque loads. Without this cage, the rollers would shift out of position, leading to uneven wear and eventual gear train failure. It is a critical element for maintaining the structural integrity of the rotating assembly, working in concert with the TRANSMISSION HOUSING and the HOUSING II to create a sealed, stable environment for power transfer.
Symptoms of Failure
- Intermittent gear slipping under load — When the roller cage wears, rollers can tilt, causing the planetary gears to momentarily lose engagement. This often manifests as a sudden loss of drive torque when climbing grades or hauling heavy loads.
- Metallic grinding noise from the transmission sump — A worn cage allows metal-on-metal contact between rollers and the gear carrier. Operators frequently report a low-pitched grinding sound that intensifies with engine RPM, indicating imminent cage fracture.
- Oil contamination with brass or steel particles — As the cage degrades, microscopic metal shavings enter the lubrication system. These particles are often visible during oil changes as a glittering suspension in the fluid, signaling that the CYLINDRICAL PIN and roller assembly are under stress.
- Erratic shift timing in automatic mode — A failing roller cage creates uneven resistance in the planetary set, confusing the transmission control unit. This leads to delayed or harsh shifts, particularly between 2nd and 3rd gears.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number (SKU) | 4660.271.006 |
| Outer Diameter | 142 mm (estimated) |
| Inner Diameter | 98 mm (estimated) |
| Thickness | 18 mm (estimated) |
| Material | Case-hardened steel (DIN 1.7131) |
| Weight | 0.85 kg (estimated) |
| OEM Reference | ZF 4660.271.006 |
| Roller Pocket Count | 22 (estimated) |
Compatibility
This roller cage is engineered for the ZF WG92 and WG98 transmission series, which are commonly found in off-highway vehicles, mobile cranes, and heavy-duty trucks. Based on its design and dimensions, the 4660.271.006 is also compatible with the WG180, WG200, and WG210 models that share the same planetary carrier architecture. It directly interfaces with the TRANSMISSION HOUSING and the HOUSING II to ensure correct axial alignment. For proper identification, always verify the TYPE PLATE on your transmission to confirm the series before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4660101017 | TRANSMISSION HOUSING | Encloses and supports the gear train assembly |
| 4660301054 | HOUSING II | Secondary housing for clutch and planetary support |
| 0631306174 | CYLINDRICAL PIN | Locates and secures the roller cage in position |
| 0769123894 | TYPE PLATE | Identification plate with transmission model and serial number |
| 0750100022 | SCREW PLUG | Seals oil passages and inspection ports |
| 4660221029 | SUCTION TUBE | Draws oil from the sump to the pump |
| 0634100317 | O-RING | Provides static seal between housing sections |
| 0636103273 | CAP SCREW | Fastens housing and cover components |
| 0634306311 | O-RING | Seals the suction tube connection |
| 4660321029 | FIXING PLATE | Retains the roller cage and prevents axial movement |
