Overview
The ZF 4642.054.051 4 WG 150 Powershift Transmission Assembly is a complete, factory-spec unit designed for heavy-duty off-highway machinery. This assembly integrates the torque converter, planetary gear sets, and hydraulic control system into a single, ready-to-install package. As the core of the WG 150 Series, it manages power distribution across four forward and reverse speeds, enabling smooth directional shifts under load. The SKU 4642.054.051 identifies this specific variant with reinforced clutch packs and upgraded sealing rings, making it suitable for high-torque applications in wheel loaders and graders.
Symptoms of Failure
When the ZF 4642.054.051 assembly begins to degrade, operators typically notice these four distinct warning signs:
- Delayed engagement or gear slipping under load — The transmission hesitates before moving forward or reverse, or it loses power during uphill travel, indicating worn clutch discs or piston seal failure.
- External oil leaks at the converter housing or output flange — Hydraulic fluid seeps from gasket interfaces, often leaving puddles under the machine after shutdown, pointing to degraded O-rings or cracked housing.
- Erratic shift quality with harsh or soft engagement — The machine lurches during gear changes or fails to hold a gear, caused by sticking shift valves or contaminated hydraulic fluid.
- Overheating transmission fluid with burnt odor — Persistent high temperatures (above 120°C) and a burnt smell signal internal friction material wear or a failing torque converter lockup clutch.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number / SKU | 4642.054.051 |
| Assembly Type | Complete Powershift Transmission |
| Series | WG 150 |
| Number of Speeds | 4 Forward / 4 Reverse |
| Dry Weight (approx.) | 385 kg (849 lbs) |
| Overall Length | 720 mm |
| Overall Width | 510 mm |
| Overall Height | 580 mm |
| Housing Material | High-Grade Cast Iron |
| Input Torque Capacity | 1,500 Nm (1,106 lb-ft) |
| OEM Reference | ZF 4642.054.051 |
Compatibility
This complete unit is engineered for the ZF WG 150 Series transmission family. It directly replaces the original assembly in the following models and their derivatives:
- ZF WG 150 — All standard configurations (4WG150, 4WG150-2)
- ZF WG 180 — Select variants using the same bellhousing pattern (verify input shaft spline count)
- ZF WG 200 — Limited compatibility with early production units (check torque converter match)
- ZF WG 120 — Not directly compatible without adapter kit; consult OEM documentation
Always cross-reference the 4642.054.051 part number against your machine’s serial plate. This assembly is commonly used in Case 921E, Volvo L120H, and Komatsu WA380 wheel loaders, though aftermarket fitment may require additional seals or gaskets.
