It would help if you state what loader you have on it, as there are 2 different types of stock loaders that the tractor might have used.
Also what exact model of B8200 is it, as there are several variations, Serial number of the tractor or loader would really help get you exact answers.
Possible off the cuff answers:
Low on fluid
Clogged suction filter
FEL spool valve issues
Damage to the pump
Relief valve issues
Three point maladjustment of linkage.
Leaking suction line (air intrusion).
Damage to cylinder seals.