Overview
The ZF 4644.153.496 COUPLING is a critical driveline component engineered specifically for the WG 180 and WG 200 transmission series. This OEM genuine part serves as the primary torque-transfer interface between the engine output and the transmission input shaft, ensuring smooth power delivery and torsional vibration dampening. Positioned directly behind the flywheel housing, the coupling absorbs shock loads during gear shifts and protects downstream planetary gear sets from sudden torque spikes. The SKU 4644.153.496 is manufactured to ZF’s exacting tolerances, making it a direct replacement for worn units in heavy-duty industrial applications. When paired with a properly sealed TRANSMISSION HOUSING (part 4644101177), this coupling maintains optimal alignment and prevents premature wear on adjacent components.
Symptoms of Failure
- Torque converter shudder during low-speed maneuvers: A worn 4644.153.496 coupling causes noticeable vibration when accelerating from a stop, often described as a “chattering” sensation through the chassis.
- Transmission fluid contamination with metallic particles: As the coupling’s splines degrade, fine metal shavings enter the hydraulic circuit, leading to valve body sticking and erratic shift patterns.
- Audible clunking when shifting between forward and reverse: Excessive backlash in the coupling produces a distinct metallic “clunk” during direction changes, indicating the need for immediate replacement.
- Oil seepage around the bell housing mating surface: A failing coupling can distort the sealing surface, causing ATF leaks that require simultaneous replacement of the O-RING (part 0634306525) to restore proper sealing.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | 4644.153.496 |
| Outer Diameter | 210 mm (8.27 in) |
| Inner Spline Diameter | 45 mm (1.77 in) |
| Overall Length | 85 mm (3.35 in) |
| Material | Forged 4140 Alloy Steel, Induction Hardened |
| Weight | 2.8 kg (6.2 lbs) |
| OEM Reference | ZF 4644.153.496 |
| Torque Capacity | 1,200 Nm (885 ft-lbs) |
| Max RPM | 3,200 RPM |
Compatibility
This coupling is designed for the ZF WG 180 and WG 200 series powershift transmissions, commonly found in construction equipment, material handlers, and agricultural machinery. It directly replaces the original coupling in WG 180-2, WG 180-3, WG 200-2, and WG 200-3 variants. The part also fits select ZF 4WG-180 and 4WG-200 models with the same bell housing pattern. For proper installation, ensure the transmission’s TRANSMISSION HOUSING (part 4644301229) is free of cracks and that the GROOVED STUD (part 0631311009) is torqued to factory specifications. Always verify the TYPE PLATE (part 0730365067) on your transmission to confirm model compatibility before ordering.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644101177 | TRANSMISSION HOUSING | Encloses gear train and supports input shaft |
| 4644301229 | TRANSMISSION HOUSING | Alternate housing variant for WG 200 series |
| 0730365067 | TYPE PLATE | Identification plate with model and serial number |
| 0631311009 | GROOVED STUD | Alignment dowel for housing-to-coupling fit |
| 4644303060 | COVER PLATE | Seals the coupling access port |
| 4644303061 | COVER PLATE | Alternate cover plate with breather port |
| 0634306525 | O-RING | Hydraulic seal between coupling and housing |
| 0636305026 | SCREW PLUG | Drain plug for coupling cavity |
| 0501316470 | BREATHER | Pressure equalization valve for housing |
| 4644301279 | SCREEN SHEET | Filter mesh protecting hydraulic passages |
