TM  10-3930-643-34 STEERING  TROUBLESHOOTING  AND  MAINTENANCE. 9-1. Steering  Troubleshooting. MALFUNCTION TEST  OR  INSPECTION CORRECTIVE  ACTION h. HARD STEERING WHILE DRIVING. Check oil pressure, if pressure is low,    adjust  to  correct  pressure setting, refer to paragraph 9-6. Check frame hinge pins for frozen bushings, refer to paragraph 10-2. Replace  frame  hinge  pin  bushings. NOTE Since  the  procedure  for  replacing  frame  hinge  pin  bushings  requires  so much  time,  other  causes  for  malfunctions  “h.”  should  be  thoroughly investigated,  refer  to  TM  10-3930-643-20. 9-5