Komatsu D20p-7 Steering issue

[machineman]

This steering problem has gotten progressivly worse and now it barely steers when pulling either lever. The machine stops when I pull the lever and sometimes makes a moaning noise underneath. Also the brake pedal isn't doing much. It used to only happen after it warmed up. I pulled the left and right steering case plugs under the machine and each side drained over a couple quarts each. These plugs have not been checked in years. Suppossed to be dry? Also I've tried adjusting the bands from under those covers at the back of the machine. Tried 1, 2, 4, and 5 turns out. Neither of those postions improved the issue, just made the brake and levers max stroke change.

Any suggestions? Could the clutches be ruined by oil or worn out? Machine has about 2900hrs on it.

Thanks..