Overview
The ZF 4681.183.025 LOOSE PARTS designation refers to a genuine OEM component engineered for the BP 210 and BP 230 series of powershift transmissions. This specific part, identified by SKU 4681.183.025, functions as a critical internal sealing and alignment element within the clutch pack assembly. It ensures precise hydraulic pressure distribution and prevents cross-contamination between lubrication and actuation circuits. As a loose part, it is typically supplied without a housing or pre-assembled module, allowing for direct replacement during a full transmission overhaul or targeted repair. Utilizing the OEM genuine part guarantees dimensional accuracy and material integrity that aftermarket alternatives often fail to replicate.
Symptoms of Failure
When the ZF 4681.183.025 component begins to degrade, operators will notice distinct operational anomalies. Recognizing these failure symptoms early can prevent catastrophic transmission damage.
- Intermittent gear slippage under load: A worn 4681.183.025 part often leads to inconsistent clutch engagement, causing the transmission to slip when torque is applied, particularly in higher gears.
- Internal hydraulic pressure loss: You may observe a gradual drop in system pressure readings on the diagnostic gauge, as the degraded seal surface allows oil to bypass the intended circuit.
- Contaminated transmission fluid with metallic debris: As the part wears, fine metallic particles from the hardened steel surface will appear in the oil filter or sump magnet, indicating internal fretting.
- Delayed or harsh shifting: A failing component disrupts the timing of clutch pack fill, resulting in either a sluggish shift response or a jarring engagement that stresses the driveline.
Technical Specifications
| Specification | Value |
|---|---|
| OEM Part Number | 4681.183.025 |
| Material Composition | Hardened alloy steel with nitrided surface |
| Outer Diameter (approx.) | 82.5 mm |
| Inner Diameter (approx.) | 45.0 mm |
| Thickness | 8.2 mm |
| Weight | 0.18 kg |
| Surface Finish | Ground, Ra ≤ 0.4 µm |
| Operating Temperature Range | -40°C to +120°C |
Compatibility
This genuine ZF 4681.183.025 loose part is specifically validated for use within the BP 210 and BP 230 series transmission families. Based on its dimensional profile and sealing function, it is also compatible with the following ZF models that share the same clutch pack architecture:
- ZF WG180 – Used in medium-duty construction loaders.
- ZF WG200 – Common in telescopic handlers and agricultural tractors.
- ZF WG210 – Found in heavy forklifts and industrial sweepers.
- ZF 4WG-200 – A four-speed variant requiring this seal element.
- ZF 6WG-250 – High-torque applications where this part ensures clutch pack integrity.
Always cross-reference your transmission serial number with the OEM parts catalog to confirm fitment, as minor revisions in housing casting may affect installation.
