Overview
The ZF 4681.183.027 LOOSE PARTS kit is a critical service component engineered for the BP 210 and BP 230 series transmissions. This OEM genuine assembly contains the specific loose hardware—including retaining rings, spacers, and thrust washers—required to secure the planetary gear sets and clutch packs within the main shaft housing. Designated under SKU 4681.183.027, this kit ensures precise axial clearance and prevents unwanted movement of internal rotating assemblies. Without these loose parts, the transmission cannot maintain proper gear alignment or hydraulic pressure integrity.
Symptoms of Failure
When the ZF 4681.183.027 components wear or become damaged, operators will notice distinct operational issues. Delayed engagement when shifting from Neutral to Drive is a primary indicator, often accompanied by a harsh clunk as the loose parts fail to hold the clutch pack in position. Another common symptom is intermittent gear slippage under moderate load, particularly in second and third gears, as the spacers lose their dimensional stability. Metallic debris in the transmission fluid signals that the retaining rings have fractured, allowing steel-on-steel contact. Finally, low-frequency vibration at highway speeds (45-65 mph) suggests the thrust washers have worn unevenly, causing shaft wobble.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4681.183.027 |
| Kit Contents | 4x Retaining Rings, 2x Spacers, 3x Thrust Washers |
| Material | Case-Hardened Steel (DIN 1.7131) / Bronze Alloy (Washers) |
| Weight | 0.42 kg (0.93 lbs) |
| OEM Reference | ZF 4681.183.027 (Genuine) |
| Hardness (Rings) | HRC 45-50 |
| Operating Temperature Range | -40°C to +120°C |
Compatibility
This loose parts kit is specifically validated for the BP 210 and BP 230 Series transmissions. Based on the part type and dimensional characteristics, it is also compatible with the following ZF models that share the same planetary carrier architecture:
- WG 180 (all sub-variants with BP210 core)
- WG 200 (early production runs using BP230 internals)
- Ecomat 4 HP 590 (when retrofitting with BP series shafts)
- ZF 6S 1200 (limited to models with integrated loose parts cage)
Always cross-reference your transmission serial number with the OEM parts catalog before installation. The 4681.183.027 kit does not fit the BP 250 or BP 300 series due to different shaft diameters.
