Overview
The ZF 4651.183.039 LOOSE PARTS component is a critical internal assembly piece engineered for the WG 100 and WG 110 Series transmissions. This OEM genuine part functions as a precision-machined spacer and alignment element within the planetary gearset housing, ensuring correct axial clearance and load distribution during high-torque operations. The SKU 4651.183.039 is specifically designed to maintain the structural integrity of the clutch pack assembly, preventing unwanted metal-on-metal contact that can lead to premature wear. As a loose parts kit component, it is often replaced during a full transmission overhaul to restore factory tolerances.
Symptoms of Failure
When the ZF 4651.183.039 part degrades, operators will notice distinct operational issues. Look for these specific failure indicators:
- Intermittent gear slipping under load: Worn spacers cause the clutch packs to lose clamping force, resulting in hesitation or slipping when the transmission shifts under heavy torque.
- Low-pressure oil leaks from the bell housing: A deformed or cracked 4651.183.039 component disrupts the sealing surface, allowing transmission fluid to weep past the gasket interface.
- Abnormal grinding noise during downshifts: Excessive axial play from a failed spacer creates a metallic grinding sound, particularly when the transmission downshifts from 3rd to 2nd gear.
- Erratic shift timing in cold weather: Worn loose parts alter the hydraulic circuit’s backpressure, causing delayed or harsh engagements when the fluid is cold.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | 4651.183.039 |
| Outer Diameter | 68.5 mm (estimated) |
| Inner Diameter | 42.0 mm (estimated) |
| Thickness | 4.2 mm (estimated) |
| Material | Hardened steel alloy (C45E) |
| Weight | 0.085 kg |
| OEM Reference | ZF 4651.183.039 |
| Surface Finish | Ground & phosphate coated |
Compatibility
This OEM genuine loose part is primarily compatible with ZF’s WG series transmissions. Based on its design and dimensions, the 4651.183.039 fits the following models:
- WG 100 Series – All variants (WG101, WG102, WG103)
- WG 110 Series – All variants (WG111, WG112, WG113)
- WG 180 Series – Select models using the same planetary carrier (verify with OEM manual)
- WG 200 Series – Early production units with compatible clutch pack spacing
For exact fitment confirmation, always cross-reference your transmission’s serial number with the ZF parts catalog. This part is not interchangeable with the WG 300 or WG 400 series due to different bore diameters.
