Overview
The ZF 4616.120.011 PRESSURE REGULATOR is a precision-engineered hydraulic control component designed exclusively for the WG 65 Series transmissions. This OEM genuine part modulates hydraulic pressure to ensure smooth clutch engagement and consistent gear shifts under load. Located within the valve body assembly, the regulator directly influences line pressure stability. The SKU 4616.120.011 is manufactured to ZF’s original tolerances, making it a direct replacement for worn units without requiring modifications to the TRANSMISSION HOUSING or adjacent HOUSING components.
Symptoms of Failure
- Erratic shift timing or gear slipping – A failing pressure regulator causes inconsistent hydraulic pressure, leading to delayed or harsh shifts, especially under heavy load.
- Oil leaks around the valve body – Worn seals on the 4616.120.011 can allow transmission fluid to escape, often pooling near the HEXAGON SCREW mounting points.
- Overheating transmission fluid – Incorrect pressure regulation forces the pump to work harder, raising fluid temperatures and accelerating wear on internal seals.
- Low line pressure warnings – Diagnostic codes or gauge readings indicating insufficient pressure often trace back to a stuck or fatigued pressure regulator spool.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4616.120.011 |
| OEM Reference | ZF 4616.120.011 |
| Material | Hardened steel body with nitrile seals |
| Weight | 0.18 kg (0.40 lbs) |
| Overall Length | 62 mm |
| Outer Diameter | 28 mm |
| Thread Type | M14 x 1.5 (inlet port) |
| Operating Pressure Range | 8–22 bar (116–319 psi) |
Compatibility
This pressure regulator is specifically engineered for the ZF WG 65 Series transmissions, including models such as WG65, WG80, WG120, WG150, WG180, and WG200. It is also compatible with certain variants of the WG 55 Series that share the same valve body architecture. Always verify the 4616.120.011 marking on the original part before installation. For complete assembly, pair this regulator with a new HOUSING gasket and torque the HEXAGON SCREW fasteners to factory specifications.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4616101066 | TRANSMISSION HOUSING | Main structural casing for gear sets and valve body |
| 0636011118 | HEXAGON SCREW | Fastener for securing valve body to housing |
| 4616301307 | HOUSING | Intermediate cover for clutch pack assembly |
| 4616301309 | HOUSING | Rear housing section for output shaft support |
| 0636011038 | HEXAGON SCREW | M8 bolt for oil pan attachment |
| 0636016015 | HEXAGON SCREW | M10 bolt for transmission mount bracket |
| 0631306085 | CYLINDRICAL PIN | Alignment pin for valve body positioning |
| 0634313118 | O-RING | Seal between pressure regulator and bore |
| 0636304019 | SCREW PLUG | Port plug for test pressure tap |
| 0634801152 | SEALING RING | Copper washer for banjo bolt sealing |
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