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Recent content by Jan1235

  1. Jan1235

    Hydraulic motors in series Problem!

    Oke so I added 2 checkvalves to the last two motors (only had two left). It improved significantly. Ordered a few more. still cant wrap my head around it why this helps though. Only downside this way I loose the reverse option. But I dont think I will need it. If I have some time left, I will...
  2. Jan1235

    Hydraulic motors in series Problem!

    You okay? Want to talk about it? Like I said earlier, my english isnt that great. If I understood something wrong, or if I explained my thoughts incorrectly you do not have to belittle me. And yes, I know what a check valve does, and yes, I was thinking wrong… glad you probably never have...
  3. Jan1235

    Hydraulic motors in series Problem!

    Oke did I offend you or something? I dont have the answers at all… With restriction I meant that (theoraticly in my head!) if there is a checkvalve in the inlet and the rotor out spins the motor, the motor will try to suck more oil wich it cant because of the checkvalve. Or am I that wrong...
  4. Jan1235

    Hydraulic motors in series Problem!

    If a back pressure at the outlet of the 4th motor solves the pulsation problem: then it is enough to put a sequence valve with internal drin and external piloting. And connect the piloting to the upstream inlet of the 1st motor. Thus optimal efficiency during work and only losses when there is...
  5. Jan1235

    Hydraulic motors in series Problem!

    “You have a problem with oscillation CAUSING the overrun. This stops the oscillation so overrun cannot happen. Since the check valve allows fluid INTO the motor, the motor cannot cavitate.” Well yeah… but if the rotor still tries to go faster then the motor and I would “restrict” the intlet...
  6. Jan1235

    Hydraulic motors in series Problem!

    Thought about that a few times too! But I figured that might be foolish. Haha.. But then the rotor can still “overrun” the motor and will give an even bigger chance of cavitation, or not?
  7. Jan1235

    Hydraulic motors in series Problem!

    Yes I understand a backpressure valve will help. But when they are under load (wich they are 98% of the time) I dont think that back pressure is really desireable.. They do “softstart” with the proportional valve
  8. Jan1235

    Hydraulic motors in series Problem!

    Thanks! All the motors have there external drain hose connected.
  9. Jan1235

    Hydraulic motors in series Problem!

    I really dont see how this would work?[ponder]
  10. Jan1235

    Hydraulic motors in series Problem!

    The motors/rotors are build on an existing (potato)harvester, the proportional valves are original on the machine and used to drive something different. So yes, I can change the speed but it wouldnt be very convinient to constantly changes that in the field. I asked the manufacture if they would...
  11. Jan1235

    Hydraulic motors in series Problem!

    I dont really have room something like that, couldn’t even figure something out to test/replicate a load without putting it in the ground. For the work it really doesnt matter that it does this. If they are not under load, they dont have to do anything. But im affraid it will destroy my motors...
  12. Jan1235

    Hydraulic motors in series Problem!

    Oke too bad. Really hoped there was some kind of “mechanical” solution. Its al part of a existing harvester, so the whole machine turns on with one button. Putting an extra signal in for a solonoid is a real pain.. Really thanks for the help though!
  13. Jan1235

    Hydraulic motors in series Problem!

    Yes kind of figured that the motors are starting to act like pumps, specially the last one in line cause it has the least return pressure. But.. is there anything to fix this? Most of the time they will be under load, but they will turn without any for a few minutes quite often too..
  14. Jan1235

    Hydraulic motors in series Problem!

    Hello, So I have 4 hydrauliek OMR 100 motors in series. The motors each drive a fairly heavy disc/rotor (around 25cm wide and around 20kg each). The disc/rotors rotate freely and do not drive anything (yet). Each motor drive’s in opposite direction. The oil is deliverd by a LS pump and the...
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