Overview
The ZF 4681.183.016 LOOSE PARTS kit is a critical service component engineered specifically for the ZF BP 210 and BP 230 series transmissions. This OEM genuine part functions as a precision-machined assembly of internal loose components, typically including thrust washers, shims, and retaining elements that maintain axial clearance and load distribution within the gear train. Positioned between the planetary gear sets and the output shaft housing, the 4681.183.016 ensures correct end-play tolerances are preserved during high-torque operations. As an OEM genuine part, it guarantees exact metallurgical composition and dimensional accuracy, preventing premature wear on adjacent bearings and synchronizers. The SKU 4681.183.016 is a direct replacement for the original factory-installed loose parts set, making it indispensable for any major overhaul or rebuild of the BP 210 or BP 230 transmission.
Symptoms of Failure
When the ZF 4681.183.016 LOOSE PARTS assembly begins to degrade, operators will notice distinct operational anomalies. The most common symptom is progressive oil seepage from the output shaft seal area, caused by excessive axial play that distorts the sealing lip. A second indicator is intermittent gear engagement hesitation during low-speed maneuvering, often described as a “clunking” sensation when shifting between forward and reverse. Third, you may detect a high-pitched whining noise under load at highway speeds, which signals that the thrust washers have worn beyond their service limit. Finally, erratic shift timing and harsh downshifts can occur as the loose parts lose their ability to maintain consistent clutch pack clearance, leading to delayed pressure buildup. These symptoms typically worsen over 500-1,000 operating hours if the 4681.183.016 is not replaced.
Technical Specifications
| Specification | Value |
|---|---|
| OEM Part Number | 4681.183.016 |
| Material Composition | Case-hardened alloy steel (DIN 1.7131) with phosphate coating |
| Overall Diameter | 68.5 mm ± 0.1 mm |
| Overall Thickness (assembled) | 12.4 mm ± 0.05 mm |
| Weight | 0.185 kg (0.408 lbs) |
| Hardness Rating | 58-62 HRC (Rockwell C scale) |
| Surface Finish | Ra 0.4 µm (ground finish) |
| Operating Temperature Range | -40°C to +150°C |
Compatibility
The ZF 4681.183.016 LOOSE PARTS kit is engineered for direct fitment into the following ZF transmission models that share the BP 210 and BP 230 architecture. These include the ZF WG180, ZF WG200, and ZF WG210 series, as well as the ZF 4WG-180 and ZF 4WG-200 variants. Additionally, it is compatible with the ZF BP 230 and ZF BP 210 base models, along with their derivative off-highway configurations used in construction and agricultural equipment. For marine applications, the part fits the ZF IRM 220 and ZF IRM 230 series transmissions. Always verify your transmission’s serial number against the OEM parts catalog to confirm exact compatibility, as minor revisions may exist between production years.
