hi,, i have a older L 275 with 700 hrs.. my son was bushhogging and noticed the bush hog would not raise..i have plenty of hyd oil.. no leaks,, checked the little wheel under the seat.. checked the vent tube,, when i check the hyd filter no oil.. broke the hi pressure line and spun motor over nothing.. Is this a sign for a new pump..?? any suggestions will be appreciated.. also i noticed a leak from the fuel tank.. i would never had thought you would have to pull the steering wheel to remove tank,,thanks again for any advice,,