Re: Hydraulic oil filters

Posted by a mechanic on July 04, 2000 at 13:30:06 from (206.9.216.86):

In Reply to: Hydraulic oil filters posted by Tyler(WA) on June 23, 2000 at 08:03:32:

Filter Basics 101. 1) A spin-on filter should be installed on the return line between the valve and the tank. When the system is on, the pump is always pumping oil at high presure. At idle, the oil has nowhere to go but through the relief valve and back to the tank at low pressure. Locating the filter here ensures that the oil is constantly filtered whenever the system is on. 2) As the filter loads up, it will take a bit of pressure to push the oil through the filter and that's why it must be after the pump. But not in a high pressure line! After the relief valve the pressure drops (most systems below 50psi) and that's plenty to force the oil thru the fiter. It's best to get a filter with a bypass indicator that lets you know when it's time to change it out.
3) If the spin-on filter were installed on the suction side, the pump will cavitate as the filter loads up and eventually the pump will not self-start.
4) A spin-on filter is generally about 10 microns and filters particles you can't see. Its only function is to clean the hydraulic fluid.
5) On the suction side, we still need a filter in front of the pump. Intake filters are typically 100 micron and their only function is to protect
the pump. The openings are large enough that cavitation doesn't occur. This filter is a fine wire mesh affair that is installed inside the tank on the outgoing suction line. These don't need to be changed very often; unless the oil was severely contaminated with large trash you can clean it with compressed air at long intervals. Now of course some tank designs might make installing a suction filter a chore or even an impossibility, so good luck!

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