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Question about Hydraulic oil
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<blockquote data-quote="rmcva" data-source="post: 525420" data-attributes="member: 5473"><p>All the tractors I've seen have the filter/s on the suction side. Industrial systems have filters on the pressure/ output side some being as low as 5 micron. With the filter being on the suction side most filters start at about 35 micron on up to 55 micron. That can allow some pretty large particles through. So if a tractor has wet brakes that are worn to the metal (and that can sometimes be hard to detect) and it gets in the hydraulic system then there's metal circulating in the system. If the steering unit shares the same fluid and metal gets in that it can be very costly. Once the system gets contaminated the only way to clean is to keep flushing with new hyd. oil. The oil used to flush the system has to be dumped and refilled until no more particles show up. On a big tractor that can cost $1,000 or more just in hyd. oil.</p><p> </p><p> A few years back I put together a filter system to use on the pressure side and can use it on any tractor with remotes. The first filter is a 2 micron and the other filter traps water. When I use it (about twice a year on each tractor) I figure gal. per minute of the pump and oil cap. and run the tractor long enough to make sure all the oil has had time to get through the filters. When I finish I remove the filter bowl and take a look at the filter to see what it's picked up. Then I decide if I need to change oil. If the oil is starting to darken the 2 micron filter will clean it up some. All I've seen in the filter so far is wet brake pad particles. If I ever see metal I'll know I have a problem that needs to be found fast.</p></blockquote><p></p>
[QUOTE="rmcva, post: 525420, member: 5473"] All the tractors I've seen have the filter/s on the suction side. Industrial systems have filters on the pressure/ output side some being as low as 5 micron. With the filter being on the suction side most filters start at about 35 micron on up to 55 micron. That can allow some pretty large particles through. So if a tractor has wet brakes that are worn to the metal (and that can sometimes be hard to detect) and it gets in the hydraulic system then there's metal circulating in the system. If the steering unit shares the same fluid and metal gets in that it can be very costly. Once the system gets contaminated the only way to clean is to keep flushing with new hyd. oil. The oil used to flush the system has to be dumped and refilled until no more particles show up. On a big tractor that can cost $1,000 or more just in hyd. oil. A few years back I put together a filter system to use on the pressure side and can use it on any tractor with remotes. The first filter is a 2 micron and the other filter traps water. When I use it (about twice a year on each tractor) I figure gal. per minute of the pump and oil cap. and run the tractor long enough to make sure all the oil has had time to get through the filters. When I finish I remove the filter bowl and take a look at the filter to see what it's picked up. Then I decide if I need to change oil. If the oil is starting to darken the 2 micron filter will clean it up some. All I've seen in the filter so far is wet brake pad particles. If I ever see metal I'll know I have a problem that needs to be found fast. [/QUOTE]
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Question about Hydraulic oil
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