3CX, 4CX
The Auxiliary Relief Valve (ARV) is a key safety device in a hydraulic valve block section. It protects a specific function (e.g., bucket curl) from sudden pressure spikes. If one of your hydraulic functions is noticeably weak, cannot hold a load ("drifts down"), or conversely, is too strong and causes hoses to burst, these are classic symptoms of a faulty ARV. A valve stuck open causes a loss of power, while one stuck closed risks destroying cylinders, hoses, or even the hydraulic pump.
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Precise Pressure Setting
Reliable system protection
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High Durability
Resistant to pressure and vibrations
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Perfect Fit
"Plug & play" installation
The accuracy and quality of materials guarantee that the valve will open at the set pressure, ensuring long and trouble-free use.
The valve is fully adapted to work with original JCB valve blocks, ensuring a consistent repair.
The GX-AFTER brand is a proven and safe alternative that offers quality comparable to original parts at a much better price.
Before unscrewing the valve, you must relieve the pressure in the hydraulic system by moving all controls several times with the engine off.
Before removing the old valve, thoroughly clean the area around it. Even the smallest contaminant entering the valve block can damage other valves or the pump.
Always install the valve with a new set of O-rings to ensure a 100% seal. Reusing old seals will likely cause a leak.
The valve is factory-calibrated to 4500 PSI. You should not change its settings yourself without specialized pressure gauges.
Answer: Yes, this is the most likely cause. Each section in the valve block has its own ARV. If the problem affects only one function, this valve is the primary suspect.
Question: What's the difference between this ARV and the Main Relief Valve (MRV)?Answer: The ARV (Auxiliary Relief Valve) protects a single section of the valve block. The MRV (Main Relief Valve) is the main safety valve that protects the entire hydraulic system and pump.
Question: Can I "turn up" the pressure on this valve myself to increase power?Answer: This is extremely not recommended and dangerous. Increasing the pressure above factory standards leads to bursting hoses, damaged cylinders, and excessive load on the hydraulic pump, resulting in very expensive failures.
If you are unsure whether the selected product is suitable for your machine, contact us and we will help you choose the right part and provide practical advice in minutes.
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