ZF 4143.302.015 GUIDE BUSH | OEM Genuine Part

Overview

The ZF 4143.302.015 GUIDE BUSH is a precision-engineered OEM genuine component designed to maintain concentric alignment of rotating shafts within the transmission housing. Positioned as a critical wear interface, this guide bush reduces lateral shaft movement and absorbs vibrational loads during gear changes. The SKU 4143.302.015 is manufactured to ZF’s original tolerances, ensuring a snug fit that prevents metal-on-metal contact between the shaft and the 4143101009 HOUSING. Without this bush, the transmission’s internal clearances would degrade rapidly, leading to premature failure of adjacent components.

Symptoms of Failure

• Oil seepage around the shaft seal – When the guide bush wears, it creates excessive radial play, distorting the seal lip and causing fluid to escape past the 0634313603 O-RING.
• Audible clunking during gear engagement – A loose bush allows the shaft to wobble, producing a metallic knocking sound that worsens under load.
• Erratic shift timing or gear slipping – Misalignment from a worn bush disrupts hydraulic pressure regulation, often misdiagnosed as a valve body issue.
• Increased vibration at highway speeds – The worn bush fails to dampen torsional oscillations, transmitting harshness through the driveline.

Technical Specifications

Compatibility

This guide bush is a direct fit for ZF’s HL 100 Series and HL 270 Series transmissions, which are commonly found in heavy-duty off-highway vehicles. It also serves as a replacement component in the WG180, WG200, and WG250 series power shift transmissions. When installing, always pair the bush with a fresh 0634313591 O-RING and inspect the 4143301025 HOUSING for scoring. The bush interfaces directly with the 4475280018 SCREW PLUG that retains the oil gallery.

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