ZF 0730.302.749 SPACER BUSH | OEM Genuine Part

Overview

The ZF 0730.302.749 SPACER BUSH is a precision-engineered OEM genuine component designed to maintain critical axial clearances within the differential assembly of heavy-duty construction machinery transmissions. This spacer bushing sits between the differential housing and the crown wheel, ensuring correct gear mesh alignment and load distribution under high-torque conditions. As part number 0730.302.749, it directly supports the structural integrity of the drivetrain, preventing metal-to-metal contact between rotating assemblies. When paired with a CROWN WHEEL and a DIFFERENTIAL, this bushing ensures consistent backlash and reduces vibration during operation.

Symptoms of Failure

• Transmission whining noise under load: A worn spacer bush allows the differential to shift laterally, causing the crown wheel to contact the housing, producing a distinct high-pitched whine during acceleration or turning.
• Premature crown wheel wear: Incorrect axial positioning from a degraded 0730.302.749 leads to uneven tooth contact patterns, accelerating wear on the CROWN WHEEL and requiring early replacement.
• Oil contamination with metallic debris: As the bushing surface erodes, fine steel particles enter the transmission fluid, visible during oil changes as a silver or gray sludge.
• Intermittent gear slipping in reverse: Loss of spacer thickness reduces preload on the differential assembly, causing momentary loss of torque transfer when engaging reverse gears in loaders or excavators.

Technical Specifications

Compatibility

This spacer bush is engineered for ZF WG-series transmissions commonly found in wheel loaders, telehandlers, and dump trucks. It is a direct fit for the following models: ZF WG180, ZF WG200, ZF WG210, and ZF WG250. The 0730.302.749 is also compatible with certain ZF APL-300 series axles when used in conjunction with a DIFFERENTIAL HOUSING. Always verify clearance when replacing the DIFFERENTIAL assembly, as the bushing thickness directly affects preload on the bevel gear set.

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