ZF 4646.199.128 LOOSE PARTS for WG251 | OEM Genuine Part

Overview

The ZF 4646.199.128 LOOSE PARTS kit is a critical service component designed specifically for the WG 251 series transmission. This OEM genuine assembly includes the necessary fasteners, seals, and small hardware required to secure and seal the transmission housing during rebuilds or major repairs. Positioned at the main casing interface, this kit ensures that the TRANSMISSION HOUSING and HOUSING components remain properly torqued and leak-free under high-torque industrial loads. The SKU 4646.199.128 is factory-matched to ZF’s exacting tolerances, eliminating guesswork during assembly.

Symptoms of Failure

• Oil seepage at housing joints: Worn or missing loose parts cause fluid to weep between the COVER and main casing, leading to gradual transmission fluid loss.
• Abnormal gear rattle or vibration: When the CAP SCREW fasteners lose clamping force, internal clearances increase, producing metallic noise during shifting.
• Intermittent pressure drops: Loose hardware allows the housing to flex, disrupting oil gallery sealing and causing erratic clutch engagement.
• Contamination ingress: Degraded seals in the loose parts set permit dirt and moisture to enter the transmission, accelerating wear on planetary gears.

Technical Specifications

Compatibility

This loose parts kit is engineered for the ZF WG 251 series, but it also cross-fits several other ZF powershift transmissions. Verified compatible models include the WG 180, WG 200, WG 211, and WG 310 series. Always confirm the housing configuration before ordering; the kit replaces all original hardware in the main casing assembly. For transmissions using the COVER SHEET or SCREEN SHEET, this kit provides the necessary mounting components.

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