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Bobcat Skidsteer Forums
General Bobcat Skidsteer Forum
Bobcat 610 speed change valve ball
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<blockquote data-quote="6brnorma" data-source="post: 98338" data-attributes="member: 5914"><p>I have 20 or so old manuals…..it is interesting when something like this comes up and forces me to dig through all of them. So, in researching this morning I have found two more valves……one so old that none of us probably have one and one fairly new and may be what you have. I don't know that I have one of the newest versions as that valve fails so seldom that I don't dig into them all that often.</p><p>Alchemysa's exploded view will be very helpful. First….I think I said the two ports face down when they actually run horizontal to the seat when mounted. If there is no fluid leaking from the valve……I generally find the problem in the 'holding pressure' adjustment….Parts #15 ~ #19. Removing the seat (#18) to get to the O-ring (#19) can be very tough without special tools. You can deform the seat face if you are not careful so I generally leave it if it does not come out fairly easily. Obviously…..if the o-ring is the problem…..you will need to go to a hydraulic shop for help. The ball in that one mics at .375. The spring in that one is the heavy spring and mics at roughly 1.030. These will vary slightly as Bobcat instructs you to grind some off the spring if pressure is too high (which would not be your problem). They instruct you to close the plug (pt #15) by a quarter turn until you have 600psi (in some cases 700psi). If the plug bottoms out before achieving the required psi you are instructed to add shims between the plug (#15) and the spring (#16).</p><p>The exploded view that I have of a valve using the third ball is a newer valve and the ball is larger in the drawing and is placed in the forward most port under plug number 20. Again……I'm not even sure that I own one of this style valves as they fail so seldom and if I did work on one, I wouldn't have even pulled that plug thinking there was nothing under it anyway. I learned something here.</p><p>Rebuild the entire valve while you have it off and apart. All of the seals in these valves can be easily obtained at any hydraulic shop for a few dollars.</p></blockquote><p></p>
[QUOTE="6brnorma, post: 98338, member: 5914"] I have 20 or so old manuals…..it is interesting when something like this comes up and forces me to dig through all of them. So, in researching this morning I have found two more valves……one so old that none of us probably have one and one fairly new and may be what you have. I don't know that I have one of the newest versions as that valve fails so seldom that I don't dig into them all that often. Alchemysa's exploded view will be very helpful. First….I think I said the two ports face down when they actually run horizontal to the seat when mounted. If there is no fluid leaking from the valve……I generally find the problem in the 'holding pressure' adjustment….Parts #15 ~ #19. Removing the seat (#18) to get to the O-ring (#19) can be very tough without special tools. You can deform the seat face if you are not careful so I generally leave it if it does not come out fairly easily. Obviously…..if the o-ring is the problem…..you will need to go to a hydraulic shop for help. The ball in that one mics at .375. The spring in that one is the heavy spring and mics at roughly 1.030. These will vary slightly as Bobcat instructs you to grind some off the spring if pressure is too high (which would not be your problem). They instruct you to close the plug (pt #15) by a quarter turn until you have 600psi (in some cases 700psi). If the plug bottoms out before achieving the required psi you are instructed to add shims between the plug (#15) and the spring (#16). The exploded view that I have of a valve using the third ball is a newer valve and the ball is larger in the drawing and is placed in the forward most port under plug number 20. Again……I'm not even sure that I own one of this style valves as they fail so seldom and if I did work on one, I wouldn't have even pulled that plug thinking there was nothing under it anyway. I learned something here. Rebuild the entire valve while you have it off and apart. All of the seals in these valves can be easily obtained at any hydraulic shop for a few dollars. [/QUOTE]
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Bobcat 610 speed change valve ball
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