ZF 4657.173.041 COUPLING for WG 190/WG 210 | OEM Genuine Part

Overview

The ZF 4657.173.041 COUPLING is a critical torque-transfer component engineered specifically for the WG 190 and WG 210 transmission series. This OEM genuine part sits between the torque converter and the planetary gear set, ensuring smooth engagement and precise power delivery under heavy-duty industrial loads. The SKU 4657.173.041 is manufactured to ZF’s exacting tolerances, providing a direct-fit replacement that eliminates driveline backlash and maintains hydraulic pressure integrity. When paired with the TRANSMISSION HOUSING, this coupling forms the central hub for rotational force distribution in your transmission assembly.

Symptoms of Failure

When the ZF 4657.173.041 COUPLING begins to wear, operators typically notice these specific failure indicators:

• Torque converter shudder during low-speed maneuvers – A vibration or jerking sensation when accelerating from a stop, often misdiagnosed as a fluid issue.
• Delayed or harsh engagement between forward and reverse gears – The coupling’s splines wear, causing a momentary lag before power transfers.
• Metallic grinding noise from the bell housing area – Worn coupling teeth produce a distinct chatter, especially under load or when shifting.
• Hydraulic fluid contamination with metallic particles – Debris from the coupling’s friction surfaces circulates through the system, accelerating wear on the HOUS.FRONT SECT and valve body.

Technical Specifications

Specification	Value
OEM Part Number	4657.173.041
Outer Diameter	210 mm
Inner Spline Diameter	45 mm
Overall Length	95 mm
Material	Case-hardened alloy steel (16MnCr5)
Weight	2.8 kg
Torque Capacity	1,200 Nm (peak)
Surface Treatment	Phosphate-coated for corrosion resistance

Compatibility

This ZF 4657.173.041 COUPLING is designed for the following ZF transmission models:

• WG 190 Series (all variants including WG 190, WG 190 E, WG 190 T)
• WG 210 Series (WG 210, WG 210 E, WG 210 T)
• WG 180 Series (limited compatibility – verify spline count)
• WG 200 Series (requires confirmation of housing interface)

Installation requires proper alignment with the HOUSING REAR PART and the HOUSING REAR SECTION to ensure concentricity and prevent premature wear.

Related Components

Part Number	Name	Function
4657101085	TRANSMISSION HOUSING	Encloses the gear train and supports bearing journals
4657201161	HOUS.FRONT SECT	Front section housing for torque converter and pump
4657201162	HOUSING REAR PART	Rear housing section for output shaft support
4657298107	HOUSING REAR SECTION	Reinforced rear section for high-torque applications
0631306816	CYLINDRICAL PIN	Alignment pin for housing-to-coupling registration
0636100801	CAP SCREW	M10 fastener for coupling-to-hub attachment
4656301148	FIXING PLATE	Locking plate to prevent screw loosening
4657301032	SCREEN SHEET	Fine mesh filter for hydraulic circuit protection
4657301033	SCREEN SHEET	Coarse mesh pre-filter for sump return line
0636100803	CAP SCREW	M12 fastener for rear housing attachment

Frequently Asked Questions

Q: Can I install the ZF 4657.173.041 COUPLING without replacing the transmission housing?
A: Yes, but we strongly recommend inspecting the TRANSMISSION HOUSING for wear on the bearing seats and alignment dowels. A worn housing can cause the coupling to misalign, reducing service life by up to 40%.

Q: What torque specification should I use for the cap screws securing this coupling?
A: Use 45 Nm for the CAP SCREW (M10) and 65 Nm for the CAP SCREW (M12). Always apply thread locker (Loctite 243) and replace the FIXING PLATE to prevent loosening under vibration.

Q: How do I verify if my WG 190 transmission uses this specific coupling?
A: Check the spline count on your existing coupling. The 4657.173.041 uses a 24-tooth internal spline. If your unit has 20 or 28 teeth, you need a different variant. Also confirm that the HOUS.FRONT SECT has the corresponding pilot bore diameter of 210 mm.