ZF 0730.302.751 SPACER BUSH | OEM Genuine Part

Overview

The ZF 0730.302.751 SPACER BUSH is a precision-machined component engineered to maintain critical axial clearances within ZF heavy-duty transmission assemblies. Positioned between rotating gear sets and stationary housings, this OEM genuine spacer bushing ensures correct load distribution and prevents metal-on-metal contact during high-torque operations. As a factory-spec part, the SKU 0730.302.751 guarantees exact dimensional tolerances required for long service life in construction machinery drivelines. When paired with a properly shimmed 2099109002: DIFFERENTIAL, this bushing helps maintain optimal gear mesh patterns and reduces parasitic friction losses.

Symptoms of Failure

• Transmission whining noise under load: A worn 0730.302.751 spacer bush allows the shaft to shift axially, causing gear teeth to misalign and produce a high-pitched metallic whine during acceleration or uphill operation.
• Intermittent gear engagement failure: When the spacer loses its original thickness, the 2099364014: CROWN WHEEL can drift out of its designed backlash range, leading to delayed or incomplete clutch pack engagement.
• Premature bearing overheating: Excessive end-play from a collapsed spacer bush forces adjacent bearings to carry unintended thrust loads, causing localized heat buildup detectable by infrared thermometer near the differential housing.
• Oil contamination with metallic particles: As the bushing wears, microscopic steel fragments enter the transmission fluid, often visible as glitter in oil samples during routine maintenance checks.

Technical Specifications

Compatibility

This spacer bush is primarily designed for ZF WG180, WG200, and WG250 series powershift transmissions commonly found in wheel loaders, graders, and excavators. It also appears in select ZF 4WG-200 and 6WG-200 drivelines where the 2099209001: DIFFERENTIAL assembly requires precise axial positioning. For applications using the 2098309010: DIFFERENTIAL HOUSING, verify the housing bore diameter matches the bushing’s 42mm OD before installation. Always replace the spacer bush when overhauling the differential carrier to prevent premature wear of the crown wheel and pinion set.

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