Overview
The ZF 4681.183.020 LOOSE PARTS assembly is a critical internal component engineered for the BP 210 and BP 230 series of powershift transmissions. This OEM genuine part functions as a precision-machined spacer and retention kit, ensuring correct axial clearance and load distribution between the planetary gear sets and the clutch packs. Without this specific loose parts configuration, the transmission cannot maintain proper gear mesh alignment or hydraulic pressure integrity. The SKU 4681.183.020 is manufactured to ZF’s original tolerances, guaranteeing a direct, no-modification fit for authorized rebuilds and overhauls.
Symptoms of Failure
When the ZF 4681.183.020 assembly begins to degrade, operators will notice distinct performance issues. Look for these specific failure indicators:
- Intermittent gear slipping under load: Worn loose parts can cause the clutch packs to lose clamping force, resulting in a momentary loss of drive torque when the machine is under heavy strain.
- Metallic grinding noise from the transmission housing: As the spacer tolerances increase, planetary gears can contact the housing, producing a distinct high-pitched grinding sound during shifts.
- Internal oil pressure fluctuations: A failing 4681.183.020 unit disrupts the hydraulic circuit, leading to erratic pressure readings on the diagnostic gauge and delayed engagement.
- Visible metal particles in the transmission fluid: Accelerated wear of this loose parts set generates fine metallic debris, which will be captured by the filter or visible during an oil change.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number (SKU) | 4681.183.020 |
| Material Composition | Case-hardened alloy steel (16MnCr5) |
| Outer Diameter | 112.4 mm |
| Inner Diameter | 68.2 mm |
| Thickness | 4.8 mm |
| Weight | 0.34 kg (0.75 lbs) |
| OEM Reference | ZF 4681.183.020 (Genuine) |
| Surface Finish | Ground and phosphate-coated |
Compatibility
This ZF 4681.183.020 loose parts kit is specifically validated for the following ZF transmission series:
- BP 210 Series – All sub-variants (BP 210-2, BP 210-3, BP 210-4)
- BP 230 Series – All sub-variants (BP 230-1, BP 230-2, BP 230-3)
- WG 180 Series – Select models with BP-style planetary carriers (verify by serial number)
- WG 200 Series – Early production units using the BP 210 architecture
For applications outside these series, always cross-reference the original transmission serial number with the 4681.183.020 OEM specification to confirm dimensional compatibility.
