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  1. M

    Hitachi ex60-2 hyd swing

    I don't make any claim to know the system BUT if pilot pressure to release a negative brake i.e. mechanical set/hydraulic release is not coming from a DCV then it will be piloted from the A or B ports connected to the swing motor via a shuttle valve. Whichever port is high will send pilot...
  2. M

    Epsilon S260L

    I'm in need of some technical info on the knuckleboom. I have a customer that is purchasing a truck mounted unit but want to remove it and make it stationary. I've been tasked with providing a hydraulic power unit for it. I need to know what manufacturer and the model code of the directional...
  3. M

    Cat 345

    Thanks Lantraxco
  4. M

    Cat 345

    Well another question for you Cat guys. Although this machine will be custom made it will use a Cat 345 "running gear", tracks, finals roller etc. The model they want to use is powered by a Rexroth A6VE160 motor with the BVI counterbalance valve option. I don't have much documentation from...
  5. M

    Cat 345

    Thanks Lantraxco, I assume the pumps use some type of load sense control, would this be correct??
  6. M

    Cat 345

    Thanks, as things progress I may be seeking some info/help from some of you.
  7. M

    Cat 345

    Thanks for the quick reply. would anyone have a schematic?? I've been asked about adapting a 345 to a special application hydraulic-wise and although have years of heavy industrial hydraulic experience I have very limited mobile.
  8. M

    Cat 345

    Got a simple question for you guys that are familiar with the Cat line of excavators. Is the propulsion circuit run closed circuit i.e. hydrostatic drive or open circuit i.e. thru directional control valves for each side? TIA Maytag
  9. M

    Hydraulic troubleshooting / diagnosis

    Check out the Internation Fluid Power Society, for $75 or so you can join. They have 12-15 different certifications and study manual for most of these. As a member you can download any of their manuals free. Material will range from basic to fairly complex.
  10. M

    Priority flow control valve

    I didn't clear much up with my download. using a new computer system that is supposed to be a combination of the best features from the Mac and Windows but there is a steep learning curve for me. Anyway Rexroth is good to provide the details like this. Never seen one of these symbols used on...
  11. M

    Priority flow control valve

    Willie, Here is a sheet from rexroth from their catalog for DCVs. Pay particular attention to any envelope(square) that has the broken lines. Any time a broken line is used it denotes a "condition" rather than a "position", a condition the the valve and all downstream components see...
  12. M

    Priority flow control valve

    symbol That is a two position valve with an "all ports blocked condition" as the spool transitions from one position to another. On some applications it won't matter, on others it will. Been on the receiving end of some bad engineering with an 'all ports blocked" condition where the rod...
  13. M

    Priority flow control valve

    pilot lines Hopefully you can see this print. If you can look at the dashed lines that are circled, longer dash is the pilot pressure, short dash is the pilot circuit drain.
  14. M

    Priority flow control valve

    pilot lines I tried to add a schematic showing the difference of a pilot pressure line and a pilot drain line BUT got the run-around with the computer, SO basically a pilot pressure circuit will drawn/should be drawn with a longer dashed line. Pilot drains will be a shorter dashed line, In...
  15. M

    Any Idea's ???

    This is a common problem in heavy industry too. I've always been able to get the piece out with compressed air. The most creative solution I saw was watching another mechanic take an energized 24VDC coil and sliding it up on the broken Allen wrench to make an electro magnet and fishing out the...
  16. M

    Vickers hydraulic pump identification on JD210/310.

    Motion Industry and Applied Technologies both are large Eaton Vickers distributors, some of their service people should be able to help you out. Tom
  17. M

    pump cavitation

    pump 10-4 on the pump shaft seal, seen that b4. Its been my experience that excess air entrainment does not accompany cavitation much less enough air to create foam. Also check your tank ALL lines entering or exiting your tank need to be below the minimum fluid level. Made a service call on...
  18. M

    Need help with hydrostatic problem.

    hydro I believe you probably answered your own question in your next to the last sentence, "I am only getting problem at full load and full speed". As the other poster replied this is where more internal bypass happens and of course more make-up oil is needed. Not sure with the Rexroth...
  19. M

    Understanding hydraulics and cylinder drift

    Check out the shaft seals on the pumps-I've had them go bad and suck air in to aerate the oil. The pump does not have to leak oil to suck air in but have seen them leak oil when not running. Good luck in your endeavor, Maytag
  20. M

    What valve do I need?

    Normally you would use a "pressure reducing" valve to limit pressure on a branch circuit, if there is a chance of load induced pressure use a reducing/relieving valve. If you try to control speed of the actuator by "metering out" be careful not to intensify pressure on the rod-end, you don't...
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