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Bobcat Skidsteer Forums
General Bobcat Skidsteer Forum
Bobcat 853 - front auxiliary valve only works in one direction
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<blockquote data-quote="ags_virginia" data-source="post: 119250" data-attributes="member: 21671"><p>To add to the initial post above, below is the hydraulic diagram of the Apitech front auxiliary valve on a bobcat 853. It's a 4-way three position valve, with spring self-centering. I have hydraulic output on the male aux port, but not on the female. Also I see a steady stream of fluid coming out out of both solenoid ports when they are removed, which tells me the pilot input to the solenoids is not blocked. I am not sure how the various restrictions (#35) are created, but it seems the net force in one of the directions is not enough to push the spool. Given lack of spool seals in the design, I wonder if I am facing a worn spool that passes pilot oil such that net force is not enough to move the spool.</p><p></p><p>Another thing to note, is that most 3rd function valves I've seen require a lot of current (~4A at 12V), and I don't believe the controller is designed to handle such power to the solenoids. Guessing I am stuck with trying to find a pilot solenoid valve which takes low power to actuate. For reference, the solenoids were measured at ~28 Ohm, and they draw only ~400 mA of current when energized. </p><p></p><p>I would greatly appreciate any advice. Meanwhile, I will try to reach out to Parker to see if there is anything I can substitute this for.</p><p></p><p>[ATTACH=full]1965[/ATTACH]</p></blockquote><p></p>
[QUOTE="ags_virginia, post: 119250, member: 21671"] To add to the initial post above, below is the hydraulic diagram of the Apitech front auxiliary valve on a bobcat 853. It's a 4-way three position valve, with spring self-centering. I have hydraulic output on the male aux port, but not on the female. Also I see a steady stream of fluid coming out out of both solenoid ports when they are removed, which tells me the pilot input to the solenoids is not blocked. I am not sure how the various restrictions (#35) are created, but it seems the net force in one of the directions is not enough to push the spool. Given lack of spool seals in the design, I wonder if I am facing a worn spool that passes pilot oil such that net force is not enough to move the spool. Another thing to note, is that most 3rd function valves I've seen require a lot of current (~4A at 12V), and I don't believe the controller is designed to handle such power to the solenoids. Guessing I am stuck with trying to find a pilot solenoid valve which takes low power to actuate. For reference, the solenoids were measured at ~28 Ohm, and they draw only ~400 mA of current when energized. I would greatly appreciate any advice. Meanwhile, I will try to reach out to Parker to see if there is anything I can substitute this for. [ATTACH type="full"]1965[/ATTACH] [/QUOTE]
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Bobcat 853 - front auxiliary valve only works in one direction
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