Overview
The ZF 0501.210.906 PRESSURE LIMITATION VALVE is a critical hydraulic control component engineered for the WG100, WG130, and WG131 transmission series. This OEM genuine part precisely regulates maximum system pressure within the valve body, preventing over-pressurization that can damage internal seals and clutches. Installed directly in the main control housing, the valve works in concert with the 4143101009: HOUSING and the 4143301025: HOUSING to maintain stable hydraulic flow. The SKU 0501.210.906 is a direct replacement for original equipment, ensuring factory-specified pressure thresholds are maintained throughout the transmission’s operating range.
Symptoms of Failure
- Erratic shift quality and gear slipping — When the pressure limitation valve sticks open or fails to seat, line pressure drops, causing clutches to slip under load and delayed engagement between gears.
- Hydraulic oil leaks around the valve body — Worn sealing surfaces or a cracked valve bore allow pressurized ATF to escape, often visible as drips near the 0634313603: O-RING interface or the 4475280018: SCREW PLUG retention point.
- Harsh or flared upshifts — A valve that sticks in the closed position causes momentary pressure spikes, resulting in jarring shifts followed by a sudden pressure drop that produces a flared (slipping) sensation between gears.
- Transmission overheating — Sustained over-pressurization forces fluid through relief passages, generating excess heat and accelerating degradation of the 4143298457: SEAL KIT components.
Technical Specifications
| Part Number | 0501.210.906 |
| Type | Pressure Limitation Valve (Spool Valve) |
| Material | Hardened Steel with Corrosion-Resistant Coating |
| Length | 48.5 mm |
| Diameter | 12.0 mm (spool section) |
| Weight | 0.035 kg |
| OEM Reference | ZF 0501.210.906 |
| Operating Pressure Range | 8–22 bar (calibrated spring) |
| Sealing Interface | Compatible with 0634313591: O-RING |
Compatibility
This pressure limitation valve is specifically designed for ZF WG-series transmissions. Verified compatible models include:
- ZF WG100 — All variants (WG100, WG100-1, WG100-2)
- ZF WG130 — All variants (WG130, WG130-1, WG130-2)
- ZF WG131 — All variants (WG131, WG131-1)
- ZF WG180 — Limited compatibility (check valve body revision)
- ZF WG200 — Limited compatibility (requires spring calibration check)
For proper installation, ensure the valve bore is clean and inspect the 4143221013: THROTTLE VALVE for wear. Always replace the 0634304484: O-RING during service to prevent bypass leakage.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4143101009 | HOUSING | Main valve body housing for pressure regulation |
| 4143301025 | HOUSING | Secondary housing for solenoid and valve assembly |
| 0634313603 | O-RING | Seals pressure limitation valve bore |
| 4475280018 | SCREW PLUG | Retains valve and seals hydraulic port |
| 0501342341 | SUPPORT RING | Backup ring for O-ring under high pressure |
| 4143298457 | SEAL KIT | Complete seal replacement for valve body |
| 0634313591 | O-RING | Seals throttle valve and pressure port |
| 0636101068 | CAP SCREW | Fastens valve body sections together |
| 4143221013 | THROTTLE VALVE | Modulates shift pressure based on load |
| 0634304484 | O-RING | Seals throttle valve bore |
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