Overview
This ZF 4651.003.003 3 WG 100(500) Powershift Transmission Assembly represents a complete, ready-to-install unit engineered for heavy-duty industrial drivelines. As a fully assembled gearbox, it integrates the clutch packs, planetary gearsets, and hydraulic control system into a single robust housing. The SKU 4651.003.003 designates a specific revision of the WG 100 series, designed to handle high torque loads in construction, mining, and agricultural machinery. This assembly sits as the primary power transfer component between the engine and the final drive, converting engine speed into usable tractive effort through multiple forward and reverse ratios.
Symptoms of Failure
When the ZF 4651.003.003 unit begins to degrade, operators typically notice distinct operational issues. Recognizing these early can prevent catastrophic driveline damage.
- Erratic clutch engagement or “gear slipping” under load: The transmission may hesitate or fail to hold a gear when pushing heavy material, often accompanied by a noticeable RPM flare without corresponding vehicle speed increase.
- Hydraulic oil contamination with metallic debris: Inspecting the transmission fluid reveals fine metallic particles or larger chunks, indicating internal clutch pack or planetary gear wear. This is a classic sign of imminent failure.
- Delayed or harsh shifting between forward and reverse: A significant lag when changing direction, or a violent “clunk” upon engagement, points to worn valve bodies or degraded seals within the hydraulic control module.
- External oil leaks from the main housing or PTO ports: Visible fluid accumulation around the bell housing or output shaft seals suggests compromised gaskets or worn shaft surfaces, leading to low fluid levels and eventual overheating.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number / SKU | 4651.003.003 |
| Series | WG 100 (500) |
| Assembly Type | Complete Powershift Transmission |
| Approximate Weight | 385 kg (849 lbs) |
| Overall Length | 720 mm |
| Overall Width | 510 mm |
| Overall Height | 580 mm |
| Primary Housing Material | High-Grade Cast Iron |
| OEM Reference | ZF 4651.003.003 |
| Max Input Torque (Estimated) | 500 Nm |
Compatibility
This complete unit is specifically engineered for the ZF WG 100 series transmission family. While the “500” suffix in the part number indicates a specific torque rating variant, the assembly is directly compatible with the following ZF models that share the same mounting pattern and hydraulic architecture:
- ZF WG 100 (all sub-variants including 3 WG 100)
- ZF WG 120 (with adapter plate verification)
- ZF WG 180 (limited compatibility; requires bell housing swap)
- ZF WG 200 (not directly compatible without major modifications)
Important: Always cross-reference your existing transmission’s serial number with the 4651.003.003 specifications. While the WG 100 series shares core components, variations in PTO configurations and shift controls exist. Consult your equipment manufacturer’s parts manual for definitive fitment confirmation.
