Bought a 2003 B2710 with 1100 hrs. Changed hydrolic oil and filter, cleaned suction line strainer refilled to proper oil level. Moves forward/reverse in low range, barely moves mid range, will not move in high range. When trying to push front loader into pile to scoop has no power to push forward to scoop up material. The hydrolics to front loader and backhoe operate fine. Any suggestions appreciated.