Overview
This complete ZF 4644.036.013 6 WG 201 Powershift Transmission Assembly represents a fully integrated drop-in replacement unit designed for heavy-duty off-highway machinery. As a core component of the WG 201 series, this assembly houses the complete gear train, hydraulic control system, and torque converter in a single sealed housing. The SKU 4644.036.013 is a direct OEM-specification unit, ensuring precise alignment with original factory tolerances. It functions as the primary power transfer mechanism, converting engine torque into controlled hydraulic and mechanical drive for loaders, graders, and industrial vehicles. This complete unit eliminates the need for partial rebuilds, offering a turnkey solution for transmission failure.
Symptoms of Failure
When the ZF 4644.036.013 assembly begins to degrade, operators typically notice these specific failure indicators:
- Delayed engagement or gear slipping under load — A common sign of worn clutch packs or degraded hydraulic pressure within the WG 201 housing, often accompanied by a hesitation when shifting from neutral to forward.
- External oil leaks at the main housing or output shaft seal — Persistent fluid seepage around the transmission bell housing or PTO cover indicates seal fatigue, leading to low oil levels and eventual overheating.
- Erratic shifting or harsh engagement — Sudden, jarring shifts or failure to hold a gear under moderate load point to valve body wear or internal piston seal failure inside the 4644.036.013 unit.
- Unusual whining or grinding noises from the transmission center — High-pitched metallic sounds during operation suggest bearing fatigue or gear tooth damage, requiring immediate replacement of the complete assembly.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number / SKU | 4644.036.013 |
| Series | WG 201 (6-speed powershift) |
| Overall Length (approx.) | 720 mm (28.3 in) |
| Dry Weight (approx.) | 295 kg (650 lbs) |
| Housing Material | High-strength cast iron (GGG-40) |
| Input Torque Capacity | 1,200 Nm (885 lb-ft) max |
| OEM Reference | ZF 4644.036.013 (OEM direct) |
| Fluid Capacity | 22 liters (5.8 gal) ZF TE-ML 03 |
Compatibility
This complete unit is engineered for the ZF WG 201 series, but its mounting pattern and hydraulic interface also align with several related ZF powershift families. Verified compatibility includes:
- ZF WG 180 — Direct bolt-on for earlier 6-speed variants with identical bell housing patterns.
- ZF WG 200 — Fully interchangeable with WG 200 units using the same 4644 prefix.
- ZF WG 201 — Primary application; exact match for all 6-speed powershift configurations.
- ZF WG 211 — Compatible with minor adapter plate modifications for certain loader models.
Always verify your existing transmission’s serial number and mounting flange dimensions before installation. This assembly is not backward-compatible with 4-speed WG 100 series units.
