L3400 having trouble with the front end loader. It will only lift when the stick is pulled about half way back if pulled all the way back it doesn't move at all. When lowering bucket it will only lower in float position all the way forward. Bucket tilt works ok.I can not apply any down pressure with the bucket. Any ideas ? Fluid level is good, tractor also has a back hoe attached the back hoe seems slow but has good down pressure.