TM 10-3930-659-20 Table 4-3.  Hydraulic Troubleshooting (Con't). MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION Step 2.  Test secondary steering manifold secondary check valve for leakage (see paragraph 12-21). Replace damaged secondary steering manifold (see paragraph 12-22). 11.  STEERING IS NONEXISTENT. Test priority valve relief pressure (see paragraph 12-27). Adjust priority valve relief pressure (see paragraph 12-27). Replace damaged priority valve (see paragraph 12-28). 12.  CONSTANT STEERING REQUIRED TO MAINTAIN STRAIGHT TRAVEL. Step 1.  Test steering system for leakage (see paragraph 12-1). Tighten all hydraulic lines, hoses, and fittings. Replace worn or leaking preformed packings, lines, hoses, or fittings (see paragraph 12-6, 12-7, 12-8, 12-9, 12-10, 12-11, 12-12, 12-13, 12-14, 12-15, 12-16, 12-17, or 12-18). Step 2.  Test steering valve for leakage in center position (see paragraph 12-23). Replace damaged steering valve (see paragraph 12-24). 13.  STEERING IS ERRATIC. Step 1.  Check for foamy hydraulic fluid and leaking hydraulic lines, hoses, and fittings. Tighten all hydraulic lines, hoses, and fittings. Replace worn or leaking preformed packings, lines, hoses, or fittings (see paragraph 17-14, 17- 15, 17-16, 17-17, 17-18, 17-19, 17-20, 17-21, 17-22, 17-23, 17-24, 17-25, 17-26, 17-27, 17-37, 17-38, or 17-39). Step 2.  Test priority valve relief pressure (see paragraph 12-27). Adjust priority valve relief pressure (see paragraph 12-27). Replace damaged priority valve (see paragraph 12-28). Step 3.  Check steering cylinder piston rod for leaks or looseness. Replace damaged steering cylinder (see paragraph 12-19). Step 4.  Test steering valve for leakage in center position (see paragraph 12-23). Replace damaged steering valve (see paragraph 12-24). 4-40