TM  10-3930-643-34 HYDRAULIC  SYSTEM  TROUBLESHOOTING  AND  MAINTENANCE. 12-1. Hydraulic  System  Troubleshooting. MALFUNCTION TEST  OR  INSPECTION CORRECTIVE  ACTION j. STICKING  LOADER Steps  below  should temperature. CONTROL VALVE SPOOL(S). NOTE be taken after system  is  heated  to  proper Step 1. Check loader control valve to determine if housing has been distorted by improperly tightened mounting bolts, refer to paragraph  12-3. Loosen and retighten mounting bolts to proper torque. Step 2. Check individual circuit valves to determine if there is distortion of valve housing by improperly tightened bolts, refer to paragraphs 12-4, 12-5, 12-6 and 12-7. Loosen and retighten bolts to proper torque. Step 3. Check control valve plunger bore(s) for burrs or scoring, refer to paragraphs 12-3, 12-4, 12-5, 12-6 and 12-7. Replace  loader  control  valve. Step 4. Check valve spools in loader control valve to see if any are warped. Also check for dirt or foreign matter, refer to paragraphs 12-3, 12-4, 12-5, 12-6 and 12-7. Clean loader control valve. Replace  spool(s)  if  necessary. Step 5. Check loader control valve for damaged, broken or distorted springs, refer to paragraph 12-3. Also refer to paragraphs 12-4, 12-5, 12-6 and 12-7 as applicable. Replace springs if damaged, broken or distorted. 12-7