Overview
The ZF 6606.330.016 COMPRESSION SPRING is a precision-engineered OEM genuine component designed for the WG150 series transmission. This critical spring provides the necessary preload and return force within the valve body or shift actuator assembly, ensuring consistent hydraulic pressure regulation and smooth gear engagement. The SKU 6606.330.016 is manufactured to ZF’s exacting tolerances, making it an essential part for maintaining the integrity of the transmission’s control system. When installed alongside a robust TRANSMISSION HOUSING or a TRANSMISSION HOUSING, this spring ensures that the internal valving operates without binding or hesitation.
Symptoms of Failure
- Delayed or erratic gear engagement: A worn compression spring can cause sluggish shifts or a noticeable delay when moving from neutral to drive, as the valve spools fail to return to their neutral position promptly.
- Intermittent transmission slipping: If the spring loses its tension, hydraulic pressure may drop intermittently, leading to clutch pack slippage under load—a common long-tail search query for “ZF WG150 slipping under acceleration.”
- Harsh or clunking shifts: A broken or fatigued spring can cause the shift valve to slam open or closed, resulting in jarring gear changes that worsen as the transmission warms up.
- Oil contamination from metal debris: A fractured spring can shed fragments into the hydraulic circuit, often requiring replacement of the SCREEN SHEET or SCREEN SHEET to prevent further damage.
Technical Specifications
| Specification | Detail |
|---|---|
| Part Number (SKU) | 6606.330.016 |
| Material | High-tensile spring steel (DIN 17223) with anti-corrosion coating |
| Wire Diameter | 2.5 mm (estimated) |
| Outer Diameter | 18.0 mm (estimated) |
| Free Length | 45.0 mm (estimated) |
| Total Coils | 8.5 (estimated) |
| Weight | Approx. 12 grams |
| OEM Reference | ZF 6606.330.016 (Genuine) |
Compatibility
This compression spring is primarily engineered for the ZF WG150 series transmission. It is also compatible with the WG180 and WG200 models that share the same valve body architecture. The spring is a direct replacement for units requiring restoration of shift quality. For proper installation, always verify that the TYPE PLATE on your transmission matches the WG150 series specifications. Additionally, secure the assembly using the GROOVED STUD to prevent any lateral movement of the spring seat.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4642101047 | TRANSMISSION HOUSING | Encloses and supports internal gear sets and valve body |
| 4642301207 | TRANSMISSION HOUSING | Alternate housing variant for WG150 series |
| 0730365067 | TYPE PLATE | Identification plate with transmission model and serial number |
| 0631311009 | GROOVED STUD | Locating pin for spring and valve alignment |
| 4642301168 | SCREEN SHEET | Fine mesh filter protecting hydraulic circuits from debris |
| 4642301169 | SCREEN SHEET | Secondary filter screen for oil return passages |
| 0636100621 | HEXAGON SCREW | Fastener for securing valve body components |
| 4642301186 | SCREEN SHEET | High-flow filter for main pressure line |
| 4644106300 | SHIFT SYSTEM | Complete shift actuator assembly including springs and valves |
| 4644306500 | COVER PLATE | Seals the valve body cavity and retains springs |
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