Overview
The ZF 4660.105.077 COUPLING is a critical torque-transfer component engineered for the WG 92 and WG 98 series transmissions. This OEM genuine part sits directly between the engine flywheel and the transmission input shaft, acting as a flexible interface that dampens torsional vibrations while ensuring precise power delivery. The SKU 4660.105.077 is manufactured to ZF’s exacting tolerances, guaranteeing a direct bolt-on fit without modification. When installed alongside the 4660101015: TRANSMISSION HOUSING, this coupling maintains proper axial alignment and reduces stress on downstream planetary gear sets.
Symptoms of Failure
- Torque converter shudder during low-speed maneuvering: A worn 4660.105.077 coupling causes noticeable vibration when the transmission is under light load, particularly in stop-and-go traffic. This “ZF coupling shudder” often mimics converter lockup issues.
- Progressive oil seepage at the bell housing joint: As the coupling’s internal seal surface degrades, transmission fluid begins to weep from the interface between the coupling and the 4660301054: HOUSING II. Look for dark, oily residue around the inspection cover.
- Metallic clicking during gear engagement: A failing coupling develops play in its splined connection, producing a distinct “click” when shifting from Park to Drive or Reverse. This symptom worsens as the 0631306174: CYLINDRICAL PIN wears against the coupling bore.
- Intermittent loss of drive under heavy throttle: Severe coupling wear allows the input shaft to momentarily disengage, causing a sudden RPM flare without corresponding vehicle acceleration. This is often misdiagnosed as a slipping clutch pack.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4660.105.077 |
| Outer Diameter | 210 mm (8.27 in) |
| Inner Spline Diameter | 32 mm (1.26 in) |
| Overall Length | 85 mm (3.35 in) |
| Material | Forged Steel with Nitrile Seal |
| Weight | 2.4 kg (5.3 lbs) |
| OEM Reference | ZF 4660.105.077 |
| Torque Capacity | 1,200 Nm (885 lb-ft) |
Compatibility
This coupling is specifically designed for the ZF WG 92 and WG 98 series powershift transmissions. It is a direct replacement in the following models: WG180, WG200, WG210, and WG250. The 4660.105.077 also fits select WG 92 variants used in agricultural tractors and construction loaders. Always verify the 0769123894: TYPE PLATE on your transmission housing to confirm part number matching before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4660101015 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 4660301054 | HOUSING II | Intermediate housing supporting the coupling |
| 0631306174 | CYLINDRICAL PIN | Alignment dowel for coupling positioning |
| 0769123894 | TYPE PLATE | Identification plate with serial number |
| 0750100022 | SCREW PLUG | Seals hydraulic test ports |
| 4660221029 | SUCTION TUBE | Oil pickup from sump to pump |
| 0634100317 | O-RING | Seals coupling-to-housing interface |
| 0636103273 | CAP SCREW | Fastener for coupling retention |
| 0634306311 | O-RING | Secondary seal for oil gallery |
| 4660321029 | FIXING PLATE | Locks coupling to input shaft |
