HYDRAULIC OIL IS CONTAMINATED HYDRAULIC OIL IS CONTAMINATED 4) 4) 5-8 3) CAVITATION OCCURS WITH PUMP NO Is hydraulic oil volume proper? YES Is not viscosity of hydraulic oil YES too high? YES Is not suction NO strainer clogged? Is not air intruding from pump NO suction line? Cause Remedy Replenish specified oil to the standard level. Replace oil with one of proper viscosity. Clean suction strainer. Check for air intrusion in suction line and retighten or replace parts. YES Has not hydraulic oil passed specified replace- ment hours? Has return filter NO been replaced at NO proper intervals? Cause Remedy Replace hydraulic oil to be specified. Flush with hydraulic oil and replace return filter.