Overview
This genuine ZF 0501.321.222 PRESSURE PART is a critical hydraulic component engineered to regulate fluid pressure within the transmission’s valve body assembly. Positioned directly in the main control circuit, it ensures precise clutch and brake engagement by maintaining consistent oil pressure across all operating conditions. The SKU 0501.321.222 is manufactured to OEM tolerances, guaranteeing a direct fit and long service life in demanding construction machinery applications. When installed alongside a properly functioning DIFFERENTIAL HOUSING, this pressure part helps maintain the structural integrity of the entire hydraulic loop.
Symptoms of Failure
- Erratic gear engagement or delayed shifting — Worn internal seals cause pressure drops, leading to harsh or slow clutch application during directional changes.
- Visible oil seepage around the valve body — Cracks or degraded O-rings on the 0501.321.222 allow hydraulic fluid to escape, leaving puddles under the transmission.
- Transmission overheating under load — Insufficient pressure prevents proper lubrication of rotating assemblies, including the DIFFERENTIAL, causing friction and thermal buildup.
- Intermittent loss of drive in higher gears — A failing pressure part cannot sustain the required backpressure, resulting in momentary power loss during uphill or loaded operation.
Technical Specifications
| Parameter | Value |
|---|---|
| OEM Part Number | 0501.321.222 |
| Material | Hardened alloy steel with nitrile seals |
| Overall Length | 72 mm |
| Outer Diameter | 28 mm |
| Weight | 0.18 kg |
| Operating Pressure Range | 12–25 bar |
| OEM Reference | ZF 0501.321.222 |
Compatibility
This genuine pressure part is designed for ZF heavy-duty powershift transmissions commonly found in wheel loaders, dozers, and graders. It is a direct replacement for the following ZF models: WG180, WG200, WG210, and WG310. The 0501.321.222 also integrates with the TAPER ROLLER BEARING assembly in the output shaft section, ensuring smooth torque transfer. For final drive applications, pairing this part with a DIFFERENTIAL from the same series guarantees optimal load distribution.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 5838109012 | DIFFERENTIAL | Distributes torque between drive wheels |
| 0750117075 | TAPER ROLLER BEARING | Supports axial and radial loads on shafts |
| 2093209023 | DIFFERENTIAL | Provides speed differentiation between axles |
| 5838300626 | DIFFERENTIAL HOUSING | Encloses and protects differential gears |
| 0631329088 | SPRING PIN | Secures pressure part alignment |
| 5838300811 | THRUST WASHER | Reduces axial friction in gear sets |
| 5838300721 | AXLE BEVEL GEAR | Transfers power to wheel hubs |
| 5838300633 | AXLE | Connects differential to final drive |
| 5838300753 | THRUST WASHER | Prevents gear end-play |
| 5838300818 | THRUST WASHER | Controls axial clearance in planetary sets |
Frequently Asked Questions
Q: Can I install the 0501.321.222 without removing the transmission?
A: Yes, this pressure part is accessible after draining the fluid and removing the valve body cover. Always replace the gasket and inspect the SPRING PIN for wear during service.
Q: How do I confirm this part fits my WG200 transmission?
A: Verify the serial number on your transmission nameplate. The 0501.321.222 is a direct OEM replacement for all WG180, WG200, WG210, and WG310 series built after 2010.
Q: What other components should I replace at the same time?
A: It is recommended to also replace the THRUST WASHER and THRUST WASHER in the same circuit to prevent debris contamination from affecting the new pressure part.
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Phone: +86 158 2286 3467 |
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