Reply to gemdozer:
I think your brak pedal rod need lubrification there are some grease fitting on
and the brake still stuck on drum and the decelerator rod too need lubrification and you should have a oil plunger for checking oil in belhousing at your right when your are on seat. GOOD LUCK
HECTOR
You need to get an oil pressure check on the steering clutch and transmission hydraulic control system.
Should be plenty of boost assist and no dragging. Minimum pressure should be 265-300 psi, depending on where you check. Also check mag strainer and filter, even though they have bypass valves if blocked. Everything is fed from the main case sump and uses the same oil.
Usual problem is worn pump and/or seals.
Check your decelerator linkage for binding and if need be there is an idle adjustment screw under the cover at the base of the decelerator spring tower.
Decelerator low idle rpm should be set at approx 200 rpm above engine low idle speed.
Correction:
I was assuming the brakes were hydraulic boost assist. Not so....they are an all mechanical unit.
Adjustment procedure is to tighten down adjustment socket until band is tight then back off 1-1/2 turns. The brakes are a fairly involved system utilizing a toggle mechanism boost that needs to be set up properly and would be affected by worn parts.