ZF 1211.304.028 SHIM for WG150 | OEM Genuine Part

Overview

The ZF 1211.304.028 SHIM is a precision-engineered adjustment component designed specifically for the WG150 series transmission. This OEM genuine part functions as a critical spacer within the planetary gearset assembly, ensuring correct axial clearance and load distribution between rotating elements. By maintaining precise end-play tolerances, this shim prevents premature bearing wear and gear misalignment. The SKU 1211.304.028 is manufactured to ZF’s exacting specifications, guaranteeing a perfect fit when installed alongside the 4642101108: TRANSMISSION HOUSING or the 4642301208: TRANSMISSION HOUSING in your WG150 rebuild kit.

Symptoms of Failure

• Excessive gear backlash and clunking: When the 1211.304.028 shim wears or compresses beyond tolerance, you will notice a distinct metallic clunk during gear engagement, particularly under load. This indicates improper clearance in the planetary set.
• Transmission oil leaks at housing seams: A worn shim can alter the alignment of the 0730365125: TYPE PLATE, causing uneven pressure on gaskets and leading to seepage around the transmission housing joints.
• Vibration during acceleration: Deteriorated shim thickness allows axial play, resulting in low-frequency vibration that intensifies as the transmission shifts through gears. This symptom often mimics failing bearings.
• Intermittent gear slipping: As clearance increases, clutch packs may not fully engage, causing momentary power loss. This is especially noticeable when the 0631311009: GROOVED STUD experiences uneven loading due to misaligned components.

Technical Specifications

Compatibility

This shim is primarily engineered for the ZF WG150 series transmission, but it also serves as a direct replacement in the WG180 and WG200 models where axial clearance specifications match. It is commonly used in off-highway vehicles, forklifts, and industrial loaders equipped with ZF powershift transmissions. Always verify clearance requirements against your service manual, as stacking multiple shims may alter the effective thickness. The 1211.304.028 is not compatible with the WG120 or WG250 series without modification.

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