ZF 4651.183.025 LOOSE PARTS for WG100 | OEM Genuine Part

Overview

The ZF 4651.183.025 LOOSE PARTS kit is a critical service component designed for the WG 100 series transmission. This assembly includes the necessary fasteners, retainers, and small hardware required to secure internal valve body components and hydraulic control circuits within the transmission casing. Specifically, the SKU 4651.183.025 ensures that the shift quality and pressure regulation remain within OEM tolerances by preventing vibration-induced loosening of internal elements. When installed alongside the 4651101015: TRANSMISSION HOUSING, this kit provides the structural integrity needed for high-torque applications in commercial vehicles and industrial machinery.

Symptoms of Failure

When the 4651.183.025 LOOSE PARTS kit begins to degrade, operators typically notice three distinct failure modes. First, intermittent gear slippage under load occurs as fasteners loosen, allowing valve body misalignment. Second, erratic shift timing manifests as delayed or harsh engagement between gears, particularly during cold starts. Third, internal hydraulic pressure loss leads to reduced torque converter lockup efficiency, often accompanied by whining noises from the transmission pump. These symptoms are frequently misdiagnosed as fluid contamination, but a thorough inspection of the 4651301039: HOUSING assembly will reveal the root cause.

Technical Specifications

Compatibility

This LOOSE PARTS kit is engineered for the ZF WG100 series, but its fastening geometry also applies to the WG180 and WG200 models when used with the 4651301013: HOUSING variant. The kit is not backward-compatible with the older WG80 series due to differences in bolt hole patterns. For proper sealing during installation, always pair this kit with a new 0634303928: O-RING to prevent fluid bypass around the valve body mounting flange.

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