Hayrack is right. You can get more power out of your machine, at the same flow and pressure, but the movement will be slower due to the larger area in the cylinder having to be filled. Too, given that most machines are designed around a certain set of parameters, changing cylinders, or doing anything to significantly change the lifting capabilities opens the door for damage to the machine's frame, be it cracks, or worst case a catastrophic failure.
To see the differences in the forces applied by various sized cylinders, and some common pressure points, take a look on the chart at the provided link. As you'll see, even a 1/4 inch change in diameter on the cylinder (1-1/4" to 1-1/2") will make a change of nearly 1100 lbs at 2000 psi. Basically the higher the operating pressure, the more change imparted due to the diameter change to the cylinder bore.
That said, before I did anything else, I'd check the pressures on your hydraulic system. Usually what happens is that as the pumps age, the start to wear out. The result is the pumps bypass pressure internally and tend to put out less than normal pressure and flow. Usually most folks don't notice the change in either pressure or flow as the reduction comes on a little at a time, over a long period. Too, many machine operations don't require the use of full pressure, so, once again, no change is noticed until a use comes about that requires force/pressure that is no longer there.
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Today's Featured Article - Upgrading an Oliver Super 55 Electrical System - by Dennis Hawkins. My old Oliver Super 55 has been just sitting and rusting for several years now. I really hate to see a good tractor being treated that way, but not being able to start it without a 30 minute point filing ritual every time contributed to its demise. If it would just start when I turn the key, then I would use it more often. In addition to a bad case of old age, most of the tractor's original electrical system was simply too unreliable to keep. The main focus of this page is to show how I upgr
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