ZF 4660.339.012 GEAR SHIFT FORK for WG200/WG92 | OEM Genuine Part

Overview

The ZF 4660.339.012 GEAR SHIFT FORK is a precision-machined component designed to engage and disengage gear synchronizers within the WG200 and WG92 transmission series. This OEM genuine part, identified by SKU 4660.339.012, slides along a shift rail to physically move the synchronizer sleeve, directing power flow through the selected gear set. Located inside the transmission housing, it interfaces directly with the shift mechanism and the 4660198001 PERIPHERALS assembly to ensure crisp, reliable gear changes under heavy-duty industrial loads.

Symptoms of Failure

• Hard shifting or gear clash: When the fork’s contact pads wear unevenly, the synchronizer cannot align properly, causing grinding noises during engagement.
• Gear slipping under load: A bent or worn shift fork fails to hold the synchronizer in position, allowing the transmission to pop out of gear during acceleration.
• Excessive shift lever play: Worn fork pads or a cracked fork body create slop in the shift linkage, making it difficult to find gears accurately.
• Metallic debris in transmission oil: Abrasion from a failing fork sheds fine metal particles, which can contaminate the 4660221012 SUCTION TUBE and accelerate wear on other internal components.

Technical Specifications

Compatibility

This shift fork is engineered for ZF’s WG series powershift transmissions, specifically the WG200 and WG92 models. It also fits the WG180 and WG210 variants when used with the correct shift rail assembly. The fork works in concert with the 0501209818 RANGE SELECTOR to manage high- and low-range gear engagement. For proper installation, ensure the 4660101011 TRANSMISSION HOUSING and 4660301018 HOUSING are free of cracks or distortion, as misalignment will accelerate fork wear.

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