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Hydraulic cylinders are not hard to rebuild. Locate an industrial hydraulic service/supply business for the seals and O-rings you will need. The end cap where the shaft comes out is often called a "gland." Inside the tube is a "hockey puck-like" thing that's bolted onto the end of the shaft. It has seals/O-ring that allows it to be pushed up or down the tube via the hydraulic fluid that is pushed in through the two ports on your cylinder. The only other seals are at the end cap where the shaft comes out. That's probably where your seeing the leak. You need to have these inspected at the industrial hydraulic service/supply store. They will check that it isn't worn too bad and can be re-sealed rather than replaced. If replacements can't be bought, they can be made. Typically, I spend under $20 for a complete set of seals for a 3" cylinder. A new gland may cost you $80 - $100. I replaced a bent 1.25" shaft for about $80 as well. It's not hard work and there's nothing high tech inside those cylinders. Go for it.
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