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  1. maytag

    Pump power reading problem or something else?

    I would lean toward the clamp-on ampmeter readings being correct especially when two different ones were used. The motors of this size that we use have a FLA of 222 which is within the range you have stated. Some things that work on paper just don't work out that way in the real world...
  2. maytag

    pickling pipe

    I need some direction from some of you experts. I'm currently trying to start a new hydraulic system-piping is all carbon steel-contractors installed the piping, it was hydro-tested, chemically flushed, pickled, supposedly neutralized and then contractors went to an oil flush and had to meet a...
  3. maytag

    proportional valve drift

    Rexroth acknowledges a drift with changes in both pressure and fluid temp although not to the extent that you have seen. I've used that valve before but have had better results from Moog. If the drift is causing a positioning problem you can always sandwich a "blocking valve" under the prop...
  4. maytag

    proportional valve drift

    What model prop valve are you using? Tom
  5. maytag

    Gear Pump Slip Calculation

    Slip also will vary with RPM and vary greatly with different manufacturers. Gear pumps used for hydraulic systems are generally rated in the 80-85% eff. range @ a specified RPM and fluid @ a certain viscosity however Voith touts a gear pump at 95% eff. under similar conditions.
  6. maytag

    metric pipe chart

    Didn't realize it would be this difficult-we have charts/tables for US pipe
  7. maytag

    metric pipe chart

    micalbrch, Thanks for your reply, looking for pipe table for seamless metric pipe, regarding working pressure, burst pressure and safety factors for different sizes and wall thickness. Tom
  8. maytag

    metric pipe chart

    Can someone direct me to a website that has a metric pipe chart with wall thickness, working pressure and burst pressure ratings. Didn't come up with much when I searched on the "net". Thanks, Tom
  9. maytag

    Hydraulic Drive Question

    Don't have any idea where you are located but if you are in the farm belt you might try a tractor/combine/cotton picker salvage yard. Most all the modern day combines and cotton pickers are hydrostatic drive and you can probably pick up a complete hydrostatic drive relatively cheap. Not doing...
  10. maytag

    Adding "Float" feature to a rear-mount snow plow

    It can be easily done, several industrial or mobile hydraulic equipment manufacturers offer valves set up this way. Good luck, Maytag
  11. maytag

    Hydraulic valve standards

    Try the Eaton/Vickers, Parker or Bosch Rexroth catalogs. Maytag
  12. maytag

    Hydraulic oil high temperature

    amar, The more info you provide the better answers you will receive, i.e., schmatic, type/model of pump etc. Hydraulic power that is not used for work is converted to HEAT and there are plenty of systems with the inefficiencies designed out and run within an acceptable viscosity range without a...
  13. maytag

    Axial Piston Pumps

    Not sure what a "10% turndown" is-if you are refering to varying flow then there are several companies/product lines that fit the bill with control that varies from manual to electric/proportional control of the swashplate. Check with Eaton, Rexroth, Oilgear. Hope this answers your question...
  14. maytag

    Hydraulic Valve Solenoid Fails Frequently

    Rectifying AC for a DC coil is not uncommon, other manufacturers do this although this is the first 196 DC I have heard about. More common is 96 VDC. If you could post a schematic you might get some more input. Its been my experience that you would have shaft seals for the pump and the pumps...
  15. maytag

    Noisy gear pump

    Rod, For whatever reason I could not get your attachment to open yesterday at work. The SS hose you show is the same type we use for water evacuation on electric arc furnaces and ladle furnace applications(vacuum). They are bad about cracking and sucking air-when this happens we lose...
  16. maytag

    Noisy gear pump

    This is common in hydraulic systems-not far removed from your application. Tom
  17. maytag

    Noisy gear pump

    op9, Entrained air will generate the noise often associated with cavitation. Look for a leak on suction side of the pump- air can be drawn in-leak does not necessarily have to leak diesel. Tom
  18. maytag

    Oil Deaeration

    If this is a big enough problem you could set your lube system up like a hydraulic tank-i.e. clean side for the pump with a baffle seperating a dirty (return) side-resident time in the tank helps with the air release. also you did not mention about how your return line is routed-make sure it is...
  19. maytag

    Leaking rod seals in Parker 2H and 3H hydraulic cylinders

    I had a similar situation with the Parker cylinders-found that the seal amterial was not compatible with the water glycol. Tom
  20. maytag

    Hydraulic Oil Selection

    David, Try posting on www.noria.com. You might get some input there. Tom

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