I have a 743 with less than 2000 hours on it. When I put it in the shop last night the machine was running fine. I changed the engine oil and greased the machine. Tonight I was working on enclosing the cab. I started the machine to lift the arms and found the machine would only lift if I got the pedal in the right position. Also the I can not curl the bucket. The pedal does nothing. The arms will only go down and do so slowly if the machine is off..... I never had Any trouble with the hydraulics so this is strange. Any ideas??????????