ZF 5838.300.160 SLOTTED NUT | OEM Genuine Part

Overview

The ZF 5838.300.160 SLOTTED NUT is a precision-engineered locking component designed to secure critical rotating assemblies within ZF heavy-duty transmissions. This OEM genuine part functions as a positive-locking fastener, typically positioned on the output shaft or differential carrier to maintain preload on bearings and gear stacks. The slotted design accommodates a cotter pin or locking tab, preventing loosening under extreme vibration and torque reversals common in construction machinery. The SKU 5838.300.160 is a direct replacement for the factory-installed nut, ensuring correct thread pitch and hardness for your transmission rebuild.

Symptoms of Failure

When the ZF 5838.300.160 slotted nut loses its locking integrity or becomes damaged, operators will notice distinct failure modes. Transmission output shaft end-play develops, causing a rhythmic clunking during acceleration or deceleration. Oil seepage from the output flange seal occurs as the nut loosens, allowing the shaft to shift axially and compromise the seal lip. Gear disengagement under load becomes frequent, particularly in lower gears, as the preload on the differential assembly is lost. Finally, vibration in the driveline at highway speeds indicates that the nut has backed off, allowing the companion flange to wobble.

Technical Specifications

Compatibility

This slotted nut is a standard fastening element across multiple ZF powershift transmission families. It is commonly specified for the ZF WG180 and WG200 series, as well as the ZF 4WG-200 and 5WG-200 variants used in wheel loaders and graders. The nut also appears in the ZF 6WG-250 transmission for larger excavators. Always verify thread pitch against your specific shaft before installation.

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