Bales are too loose on a omc 596 hay baler cant see any adjustment for that?

The only way to make a tighter bale with OMC roll balers is to have a tractor with good hydraulics...cylinders on your baler that are sound with NO seepage...and keep driving and feeding hay into the chamber until the guage reaches the red zone. You'll risk either shearing off bolts or making your slip-clutch slip...depending on your baler's design.

The core is going to be soft no matter what. The outside shell density is what puts the pounds into bales from this type of baler. I have made bales as light as 725 pounds and bales as heavy as 1700 pounds with 596 OMC balers.