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222-0084 Main Relief Valve
222-0084 Main Relief Valve For Caterpillar
System protection starts with a precisely calibrated main relief valve. The 222-0084 is designed to regulate maximum hydraulic pressure in Caterpillar equipment, preventing overpressure conditions that can lead to component failure. Manufactured with a hardened steel poppet and precision-machined seat, it delivers consistent crack pressure and reseat characteristics for reliable system stability. The valve assembly is tested to ensure accurate pressure settings, allowing hydraulic systems to operate within safe limits while maintaining peak performance during high-demand cycles. Its compact construction enables straightforward installation within existing hydraulic manifolds without requiring system modifications. By maintaining consistent pressure margins, this valve helps preserve pump life and reduces the risk of seal or hose failures. Suitable for a wide range of earthmoving equipment, it provides a dependable solution for maintaining hydraulic circuit integrity under continuous heavy loads.
Part number 222-0084, also marked as 2220084 or CA2220084, is a heavy-duty mechanical hydraulic main relief cartridge valve. Threaded directly into the excavator’s main hydraulic control valve block, it regulates and caps the maximum hydraulic system pressure. When cylinders reach full stroke or meet immovable loads, this valve opens to divert surplus hydraulic oil back to the tank, shielding pumps, hoses and cylinders from burst damage caused by extreme overpressure on job sites. Full technical details are placed on our dedicated parameter page for easy reference. This aftermarket valve is engineered for outstanding durability to handle continuous high-pressure cycles, vibration and harsh working conditions on construction sites. It fits a broad lineup of CAT medium and large crawler excavators across C-Series, D-Series and selected E-Series models, covering small, mid-size and large production excavators for convenient fleet repair and hydraulic system maintenance.
| Item | Details |
|---|---|
| OEM Number | 222-0084 2220084 CA2220084 |
| Part Type | Hydraulic Main Relief Valve |
| Fits | For CAT |
| Condition | New Aftermarket |
| MOQ | contact us |
FAQ Section
Q1: What is the function of this hydraulic main relief valve 222-0084?
A: It installs inside the main hydraulic valve block to limit maximum system pressure. It releases excess oil back to the tank under overload conditions to protect hydraulic pumps, hoses and cylinders from overpressure damage.
Q2: Which excavators are compatible?
A: CAT C-Series, D-Series and selected E-Series medium-to-large crawler excavators: Small-Medium: 311D LRR,312C,312C L,315C,318C,319C Core Fleet:320C,320D,320D L,320D LN,321C,321D LCR,322C,323D L Large:324D,325C,325D,328D LCR,330C,330D,330D L,336E L
Q3: What are common failure symptoms?
A: Severe loss of digging power, sluggish boom lifting or travel under load, rapid hydraulic oil overheating and audible whistling noise from continuous pressure bleeding.
222-0084 Main Relief Valve For Caterpiillar
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