Hello, i have a 1975 Ford 335. The Tractor has a ford bucket attachment 19-532. I have gotten a lot of use out of this tractor. Yesterday i was moving a lot of dirt around. When i grab a bucket full the bucket would not hold a load. I backed up,i can raise and lower the bucket but can only curl slightly and then it drops down. Should i start with the cylinders or controls or somewhere else?