I'll assume a few things. You have enough fluid, your filters are clean INCLUDING the suction screen, and the loader/backhoe cylinders are size matched to the tractor.
When you say little power - do you mean it is slow, or that it doesn't have any strength? There is a big difference.
Too slow means that you are not getting enough flow. Flow is dependent on pump displacement, pump speed (read Engine RPM) and efficiency. Pump displacement is fixed, you control pump speed, and efficiency is dependent on wear and piping resistance. If running the engine at PTO speed doesn't give enough flow (speed) and you don't have any "unusual" restrictions in the system then other than replacing / rebuilding the pump, there isn't a lot you can do. If flow is too low, I'd check the fluid levels and filters INCLUDING suction screen again, look for crimped hoses and lines. If you want to post the loader boom cylinder dia, rod size and length (min to max extension) I can calculate the time it "should" take to extend fully at various flows, and you would know if you are in the ballpark.
No strength means low pressure. If the loader/hoe moves fast enough with no load, but can't lift or dig any weight, then the problem is low pressure. Easily checked with a simple setup (search archives). This is most likely caused by a low setting on a pressure relief valve which you can adust. Warning - don't abuse this - set it to the correct value, don't just crank up the pressure!!! There are typically multiple pressure relief valves in the system(with their own settings!), certainly there are on my hoe, so you might have to test various circuits. If you have good curl strength, but no boom strength, focus on the boom circuit etc...
Other than that - if your cylinder size is mis-matched, you're going to move fast with no strength, or move slowly with immense strength. Either way you're out of luck to change anything /forums/images/graemlins/confused.gif
