Overview
The ZF 4681.183.021 LOOSE PARTS component is a critical internal assembly element engineered for the BP 210 and BP 230 series of powershift transmissions. This OEM genuine part functions as a precision-machined spacer or thrust washer cluster, responsible for maintaining correct axial clearances between rotating gear sets and the transmission housing. By ensuring proper load distribution and shaft alignment, this loose parts kit prevents metal-on-metal contact during high-torque operations. The SKU 4681.183.021 is manufactured to ZF’s original factory tolerances, guaranteeing a direct fit without modification. It sits within the intermediate shaft section of the transmission, directly influencing gear mesh accuracy and overall drivetrain longevity.
Symptoms of Failure
When the ZF 4681.183.021 LOOSE PARTS assembly begins to degrade, operators will notice distinct operational anomalies. The most common failure indicators include:
- Intermittent gear slipping under load: Worn thrust surfaces allow excessive shaft play, causing gears to momentarily disengage during heavy hauling or incline operation.
- Low-frequency vibration at the shift lever: Deteriorated spacer components create uneven rotational forces, transmitting a distinct shudder through the driveline between 1,200 and 1,800 RPM.
- Metallic debris in transmission fluid: As the loose parts wear, microscopic steel particles contaminate the hydraulic circuit, often visible during routine oil changes as a fine silver sludge.
- Gradual oil seepage from the bell housing: Misalignment caused by a failing spacer stack can distort the main seal surface, leading to slow but persistent fluid loss around the input shaft.
Technical Specifications
| Parameter | Value |
|---|---|
| Outer Diameter | 68.5 mm |
| Inner Diameter | 42.0 mm |
| Thickness (Stack Height) | 12.4 mm |
| Material Composition | Case-hardened 20MnCr5 steel |
| Weight | 0.18 kg (0.40 lbs) |
| OEM Reference | ZF 4681.183.021 |
| Surface Hardness | 58-62 HRC |
Compatibility
This OEM genuine part is specifically validated for use in the following ZF transmission families. The 4681.183.021 loose parts kit is a direct replacement for units operating in the BP 210 and BP 230 series. Based on its dimensional profile and load rating, it also serves as a cross-compatible component for these models:
- ZF WG180 (all sub-variants)
- ZF WG200 (early and late production)
- ZF WG210 (non-ECO versions)
- ZF BP 210 Series (all ratios)
- ZF BP 230 Series (all ratios)
Always verify the existing part number before installation. This component is not interchangeable with the 4681.183.020 variant, which has a different stack height tolerance.
