1、Filters,List 4 types of contaminants,Water-acid Metal Burrs and chips Dust, sand, pieces of seals and paint rust lint, fibers,Explain the concept of a micron,Measure of the opening hole size of a filter. The size of particle that can pass through the filter Micron 3.95 x 10 to the -5 or .000039 inch

2、es or .00004 millionth of an inch 10 mu = 1/10 size of a grain of table salt Particles of 40 to 50 microns are visible,Explain the difference in a filter and a strainer,A filter can catch smaller particles than a strainer,Three Types of Filter Rating,Mean - the average size of pore opening in the fi

3、lter. Absolute - The size of the largest opening in the filter, removes 100% . Nominal - that is given to the by the manufacturer. Nominal rating - Ex. 10 microns traps most particles (98%) 10 or larger (largest 25um).,Surface and Depth Filters.,A. Surface B.Depth ab absorbent - Mechanically remove

4、dirt. ad adsorbent - Mechanically and Chemically remove dirt. charcoal, chem treated paper, fuller earth) Works to remove oil oxidation, even additives,Describe the two most common types of filtration systems,Full-flow- filters entire supply of oil as it circulates in the hydraulic system Bypass- sm

5、all portion of oil is diverted through the filter,Difference in surface and depth filters,Surface- have a single surface that catches and removes dirt particles Depth- thicker filtering area,Describe features of various types of filters,Has indicator to tell when to change Sensors to tell if stopped up Disposable vs washable,Explain the appropriate procedure for maintaining the filter,Check filter according to recommendations in the manual replace filter according to recommendations in the manual foll