Overview
The ZF 4657.174.043 COUPLING is a critical OEM genuine component engineered for the WG 190, WG 210, and related BP 230 series transmissions. This precision-machined coupling serves as the primary torque transfer interface between the engine flywheel and the transmission input shaft, ensuring smooth power delivery and dampening torsional vibrations. As an original ZF part, SKU 4657.174.043 guarantees exact fitment and metallurgical integrity, eliminating the guesswork associated with aftermarket alternatives. When installed alongside the 4657101078: TRANSMISSION HOUSING, this coupling forms the core of the driveline assembly, directly influencing shift quality and component longevity.
Symptoms of Failure
When the ZF 4657.174.043 COUPLING begins to wear, operators typically notice three distinct failure modes. First, abnormal driveline chatter or shudder during low-speed engagement becomes audible, often misdiagnosed as gear slipping. Second, visible metal debris in the transmission oil filter indicates spline wear or material fatigue from the coupling hub. Third, increased axial play at the input shaft can be detected during routine maintenance, leading to premature bearing failure. Fourth, intermittent loss of torque under heavy load occurs as the coupling’s damping capacity degrades, causing harsh engagement cycles that stress the 4657201166: HOUS.FRONT SECT and adjacent components.
Technical Specifications
| Specification | Detail |
|---|---|
| Part Number (SKU) | 4657.174.043 |
| OEM Reference | ZF 4657.174.043 (Genuine) |
| Material | High-tensile alloy steel with nitrided splines |
| Outer Diameter | 174 mm (approx.) |
| Overall Length | 95 mm (approx.) |
| Weight | 3.2 kg (7.1 lbs) |
| Torque Capacity | Up to 2,100 Nm (dependant on transmission variant) |
| Operating Temperature Range | -40°C to +120°C |
Compatibility
This OEM coupling is specifically designed for ZF’s WG and BP series powershift transmissions. Verified compatibility includes the WG 190 Series, WG 210 Series, WG 230 Series, as well as the BP 210 Series and BP 230 Series. It is also a direct replacement for units found in the WG 180 and WG 200 variants when cross-referenced with original build sheets. For proper installation, the coupling must be aligned with the 4657201168: HOUSING REAR PART and the 4657298101: HOUSING REAR SECTION to maintain correct axial clearance.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101078 | TRANSMISSION HOUSING | Main structural casing for gear and shaft support |
| 4657201166 | HOUS.FRONT SECT | Front section housing the input bearing and seal |
| 4657201168 | HOUSING REAR PART | Rear housing section for output shaft support |
| 4657298101 | HOUSING REAR SECTION | Extended rear housing for PTO or auxiliary drives |
| 0631306816 | CYLINDRICAL PIN | Alignment pin for housing-to-coupling doweling |
| 0636100801 | CAP SCREW | M10 fastener for coupling-to-hub retention |
| 4656301148 | FIXING PLATE | Locking plate to prevent screw loosening |
| 4657301032 | SCREEN SHEET | Fine mesh filter for oil return circuit |
| 4657301033 | SCREEN SHEET | Coarse mesh pre-filter for suction line |
| 0636100803 | CAP SCREW | M12 fastener for housing section bolting |
Frequently Asked Questions
Q: Can the 4657.174.043 coupling be reused after a transmission rebuild?
A: ZF strongly recommends replacing this coupling during any major overhaul. The nitrided spline surface wears microscopically over time, and reuse can lead to accelerated wear of the mating input shaft and the HOUS.FRONT SECT bearing bore.
Q: What torque specification is required for the cap screws securing this coupling?
A: For the associated CAP SCREW (0636100801), the standard tightening torque is 65 Nm ±5 Nm, applied in a cross-pattern sequence. Always use a new FIXING PLATE to lock the fasteners.
Q: Does this coupling fit the ZF WG 180 transmission?
A: Yes, the 4657.174.043 is physically compatible with the WG 180 series, provided the transmission is equipped with the correct HOUSING REAR SECTION and input shaft spline configuration. Verify your transmission serial number against ZF’s parts catalog before ordering.
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Email: info@partszf.com |
Phone: +86 158 2286 3467 |
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