ZF 0630.004.138 SHIM RING for WG200 | OEM Genuine Part

Overview

The ZF 0630.004.138 SHIM RING is a precision-engineered OEM genuine component designed specifically for the WG 200 Series transmission. This shim ring plays a critical role in establishing the correct axial clearance and preload within the planetary gear set assembly. By maintaining precise tolerances, it ensures optimal gear mesh alignment and load distribution. The SKU 0630.004.138 is installed between the transmission housing and the bearing race, acting as a spacer to compensate for manufacturing tolerances. Without this shim ring, the internal rotating assembly would experience excessive end-play, leading to premature bearing wear and gear noise. It is a vital element for any rebuild or overhaul of the WG200 gearbox.

Symptoms of Failure

When the ZF 0630.004.138 SHIM RING wears or becomes damaged, operators will notice distinct operational issues. Look for these specific failure symptoms:

• Excessive axial play in the output shaft: A worn shim ring allows the shaft to move back and forth, causing a noticeable clunking sensation during acceleration or deceleration.
• Low-frequency gear whine or growling: Incorrect clearance from a collapsed shim ring forces gears to run out of alignment, producing a deep, rhythmic noise that increases with road speed.
• Oil contamination with metallic debris: As the shim ring wears, it generates fine steel particles that circulate through the transmission fluid, often visible on the magnet of the drain plug.
• Intermittent gear slipping under load: When axial clearance exceeds specifications, the clutch packs may not fully engage, leading to momentary power loss during uphill climbs or heavy hauling.

Technical Specifications

Compatibility

This shim ring is engineered for the WG 200 Series transmission family. Based on its dimensions and application, it is also compatible with the following ZF models that share the same planetary carrier architecture:

• ZF WG 180
• ZF WG 200
• ZF WG 210
• ZF WG 211

Always verify your transmission serial number before ordering. This part is commonly used in buses, construction vehicles, and heavy trucks equipped with ZF automatic transmissions.

During installation, this shim ring works directly with the TRANSMISSION HOUSING (4644101165) to set the correct bearing preload. It is also positioned near the HOUSING (4644301304) that encloses the valve body. For proper identification of your transmission variant, refer to the TYPE PLATE (0730365067) which lists the exact model code. Finally, the shim ring is secured in place by the GROOVED STUD (0631311009) that aligns the bearing race.

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