TM10-3930-660-20 Table 2-3. Mechanical Troubleshooting (Cont’d) MALFUNCTION TEST OR INSPECTION CORRECTIVE  ACTION Step 2. Step 3. Step 4. Step 5. Step 6. Step 7. Step 8. Engine speed too low. Increase engine speed with accelerator pedal. Check oil level. Add hydraulic oil to proper level, LO10-3930-660-12. Inspect hydraulic line(s) and tube(s) for damage. Replace hose(s) and tube(s) as necessary, para. 18-26. Check strainers and filter for obstructions. Repair or replace filter, para. 18-30, and/or inspect and clean tank strainers, para. 18-29. Check relief valve for defects. Inspect relief valve in system with little or no pressure. Replace relief valve if necessary, para. 18-9. Check for worn or defective pumps. Test pumps for proper operation and replace if necessary, para. 18-4 and 18-5. Check for proper hydraulic oil viscosity. Verify oil weight with oil sample. If incorrect, drain hydraulic tank, para. 5-10. Add correct oil, LO10-3930-660-12. 51. HYDRAULIC FUNCTIONS MOVE ERRATICALLY Check for air leak in hydraulic system. Operate hydraulic system, purge air from hydraulic circuts. Check for leaks and loose connections on pump inlet lines, para. 18-3. 52. SLOW BOOM OR EXTEND FUNCTIONS Step 1. Check for pinched or kinked sections of pilot hoses. Replace pilot hoses as necesary from cab to control valve, para. 18-26. 2-49