You said you bought it recently and got it running, I take it that means you haven't seen the bucket work since you bought it, so it may have been a problem when you bought it. Please correct me if that is not correct and you have seen the bucket working. If you haven't done this, check the routing of the hoses. Make sure the same hose from the valve goes to the same end of both cylinders. If they are going to opposite ends they could be canceling each other. I would think you would see the bucket trying to twist if that was the case.
To check the cylinders themselves, unhook both hoses from one bucket cylinder and plug or cap the hose ends. Do not hook the hoses together, they need to be dead ended. Hook up something for hoses from the cylinder fittings to a bucket, because if the bucket moves during the test you will have oil come out of the cylinder ports. Start it and try moving the bucket with the one cylinder still hooked up. If it moves it is likely that cylinder is working. Swap things around and try the other cylinder the same way. If one doesn't move the bucket, but the other one does, The one that doesn't move the bucket is likely bad.
If you have a hydraulic gauge (I would expect you should have a 3000 psi, or more, gauge) you could put it in one of the plugged/capped hoses and see what you have for pressure during this cylinder check. If no pressure shows in either direction, your problem is in the valve or hoses between the valve and cylinders. You say the boom arms will lift. That tells me the pump, supply and boom valve work, so this will reduce what it might be.
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Today's Featured Article - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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