ZF 4657.173.027 CLUTCH for WG 190/WG 210 | OEM Genuine Part

Overview

The ZF 4657.173.027 CLUTCH is a critical torque-transfer component engineered specifically for the WG 190 and WG 210 series transmissions. Positioned within the planetary gearset assembly, this OEM genuine part engages and disengages power flow between the input shaft and the intermediate shaft, enabling smooth gear changes under heavy load. The SKU 4657.173.027 is manufactured to ZF’s original tolerances, ensuring precise hydraulic actuation and minimal drag in high-cycle industrial applications. This clutch assembly works in concert with the TRANSMISSION HOUSING to maintain proper alignment and oil circulation within the WG 191 Series.

Symptoms of Failure

• Delayed or harsh engagement: When the 4657.173.027 clutch wears, operators often report a noticeable lag between shifting and power delivery, or a sudden “clunk” as the clutch plates grab unevenly.
• Transmission oil overheating: A failing clutch generates excessive friction, causing the hydraulic fluid to exceed normal operating temperatures. This is frequently accompanied by a burnt odor from the transmission breather.
• Gear slipping under load: If the clutch cannot maintain clamping force, the transmission will momentarily lose power during uphill climbs or when towing heavy equipment, often triggering a fault code for clutch pressure deviation.
• Oil contamination with metallic debris: Worn clutch friction material and steel plates shed particles that appear as silver or dark sludge in the oil filter. This debris can also damage the HOUS.FRONT SECT sealing surfaces if left unaddressed.

Technical Specifications

Compatibility

This clutch is a direct replacement for the following ZF transmission models: WG 180, WG 190, WG 200, and WG 210 series. It is specifically validated for the WG 191 Series category. The 4657.173.027 interfaces with the HOUSING REAR PART to create the sealed clutch drum cavity. For proper installation, ensure the CYLINDRICAL PIN is aligned with the hub spline to prevent rotational misalignment. This part is not backward-compatible with WG 120 or WG 150 transmissions without modifying the piston return spring assembly.

Related Components

Frequently Asked Questions

Q: Can the 4657.173.027 clutch be rebuilt with aftermarket friction plates?
A: While aftermarket plates may fit dimensionally, ZF recommends using only OEM genuine friction material for the WG 190/WG 210 series. The hydraulic piston stroke of 3.2 mm is calibrated for the specific coefficient of friction of the OEM lining; using non-OEM plates can cause premature wear or clutch drag.

Q: What is the typical service interval for this clutch in a WG 191 transmission?
A: Under normal operating conditions (non-continuous heavy hauling), the 4657.173.027 clutch should be inspected every 2,000 operating hours or at each major transmission overhaul. Signs of glazing or uneven wear on the steel plates indicate immediate replacement is needed.

Q: Does this part include the piston return springs?
A: No, the 4657.173.027 is supplied as the complete clutch pack assembly (friction plates, steel plates, and snap ring). The return springs and piston are separate components. You will need to order the HOUSING REAR PART gasket kit separately for proper sealing during reassembly.