3CX, 4CX
A seal kit is a key element for rebuilding an ARV relief valve. It is responsible for maintaining the internal and external seals of the valve. If one of your hydraulic functions is noticeably weak, cannot hold a load ("drifts down"), or you see an oil leak from the valve body, these are classic symptoms of worn seals. A leaking valve reduces machine efficiency, leads to oil overheating, and contaminates the entire system, which risks damaging the hydraulic pump.
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Pressure and Temperature Resistance
Long life and no leaks
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Precise Dimensions
Effective leak elimination
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Complete Repair Kit
Everything you need for a rebuild
The accuracy and quality of materials guarantee long and trouble-free use without the need for frequent replacement.
The kit is fully adapted to work with original JCB valves, ensuring a consistent and reliable repair.
The GX-AFTER brand is a proven and safe alternative that offers quality comparable to original parts at a much better price.
Before loosening 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.
Before installing new seals, carefully inspect the valve body and plunger for scratches and scoring. Installing new seals on a damaged valve will not be effective.
Before installation, lubricate all seals with clean hydraulic oil. This will ease assembly and prevent them from being damaged.
Answer: Yes, if the cause is an internal leak in that section's ARV valve. Replacing the seals should restore the correct pressure and power.
Question: Can I just replace the one leaking O-ring?Answer: It is highly not recommended. The seals in a valve wear out at a similar rate. Replacing only one component is uneconomical, as another will soon fail.
Question: What happens if I operate with a leaking valve?Answer: Operating with a leaking valve leads to a loss of performance, oil overheating, and contamination of the entire system, which can result in a much more serious and expensive failure of the hydraulic pump.
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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Seal set for ARV valve 25/222498

















