TM 5-3805-258-24-1P O W E R T R A INT R A N S M I S S I O N H Y D R A U L I C S Y S T E MS Y S T E M S O P E R A T I O NOIL FILTERPressure oil, from the oil pump, goes in filter base(6) through inlet passage (4). The oil goes throughthe filter base to housing (8). Oil fills the spacebetween the inside of housing (8) and filter element(7). Normally, oil goes through the filter element andthen to the outlet passage. The oil then goes to theremainder of the hydraulic system. The filter ele-ment stops any debris that is in the oil.If the filter element becomes full of debris, therestriction to the flow of oil causes a pressure increaseinside the filter. The increase in pressure causes by-pass valve (1) to open. The oil then goes to thehydraulic system. When the oil does not go throughthe filter element, it is dirty and the debris in the oilcan cause damage to other components in the hy-draulic system.Correct maintenance must be used to make certainthat filter element (7) does not become full of debrisLOCATION OF OIL FILTERand stop the flow of clean oil to the hydraulic system.MAGNETIC SCREENA magnetic screen is inside of the transfer gearcase. Oil from the bottom of the transfer gear casegoes through an inlet passage. As the oil goes throughthe screen, foreign particles that are in the oil arestopped by the screen and can not go into the trans-mission hydraulic system.After the oil goes through the screen, it goesaround and through magnets. The magnets are in-stalled on the tube assembly so that the same magne-tic ends are next to each other. Smaller metal parti-cles that go through the screen are stopped and heldby the magnets. These magnets will not let the metalparticles go with the oil through the hydraulicsystem.The oil then goes through the outlet passage to thetransmission pump.COMPONENTS OF THEOIL FILTER1. Bypass valve. 2. Spring. 3. Plug, 4. Inlet passege. 5.Outlet pemege. 6. Base.7. Etement.8. Housing.LOCATION OF MAGNETIC SCREEN3-28
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