awesome explanations. thank you. i've been struggling with this for a while - but after your explanations and visual walk-through, everything that i was being told has suddenly clicked together. i understand what is happening much better now, and why these components are important.
I forgot to explain why standby pressure is higher than margin. oops. I'll do a 3rd video on these controls. I want to talk about electric control of l/s and also about torque limiters anyways so I'll cover all that in the next one.
This is one of the better explanation of this type of pumps I have found. Thanks for your effort. It wud have been nice if you had explained in what real world situation, wud the Pressure Cut Off work or come into action.
Great video really helped me out ! Just a question, if my squash plate seems to be stuck in low flow which creates slow hydraulics, which one should I be adjusting ? I have a John Deere 230clc if ever that can help ! Thanks have a good one
Thank you for explaining this so well detailed! i got this pump on my 3,5 ton Pel job excavator but it just seems like it keeps pushing full oil. I know: the load sense signal is 0, but a high pressure comes from the pump to the load sense signal (tested that with open lines). the pump draws full engine power while not being operated and the engine can't get over 1800rpm... the pump does listen to the standby regulator as the powertake becomes less when i run the standby regulator out. I got a extra power regulator on the side of the pump which i plugged up, so that aint causing it either at the moment. i tried a different new regulator of a same pump, but same issue. To me it really looks like the destroke piston is having an issue and isn't returning completely out, or the spring must have broken or something like that. Could you maybe give me your thoughts on this issue?
Watched both vids , great explanation. I've got a Volvo ec 60e that uses open center negative control . Be great if you could do the same type video explaining that and how it differs from your CCLS system . Thanks
This was very helpful to understand the Load sensing system. Would you like to do a Zoom education session to our trainees via Zoom. We are a Trade School in Sri Lanka. However due to Covid 19 lock downs & outbreak our study limited to online. Which make difficult to get the overall learning environment. Such as practical training. Thanks for your Video any way.
Please explain difference between DR controller and DFR1 controller , basic difference is DFR1 control both pressure and flow . If we use closed loop DCV then how both type of controller will make any difference? What benifit we have to choosing DFR1 over DR? As both has almost same internal circuits.
I've seen those pump control valves just like the one you have cut away there leak the load sense pressure so then the system won't build the correct amount of pressure. I've taken them apart and inspected them but never find anything wrong but after installing a new valve on the pump, the system works correctly. Any idea where in that valve the problem exists?
@hystat Is there a power-limiting valve to prevent the diesel from stalling in this setup, or where would it be located if it had one? Rexroth manuals refer to this as "LA", which is a relief valve that overrides/lessens the LS pressure signal and destrokes the pump in case the combination of flow and pressure exceed the power of the prime mover (smaller then the pumps corner power). Any idea about this?
Like the video man. Have a question you may have an answer for. That looks like an a10vso28 or 45. Clockwise rotation. And the way that comp is on there in my experience doesn't usually operate correctly. Is that a standard dfr/dr compensator? I build and test these daily for a living and I've never come across one of these with comp controls facing your inlet port. Very informative video regardless. Im just hoping I might learn something. And also is that a caterpillar pump?
@@hydraulics hey thank you for the info. I mainly deal with rexroth pumps. So cat and John deere show up now and again. But im not nearly as familiar with their design quirks.
My small fishing trawler has a pump which looks similar but I have a manual lever on the pump which I can use to give low through to high flow, I then have a normal two way control valve on the winch, is that some kind of load sensing pump?
Thank you for your effort to explain pump control.. but I want to be sure from a point You said in this video (DFR pump means load sensing ) while in RR catalouge for pump A10VSO for example say just DFR not load sensing My qestion Is DFR means load sensing ?? Or there is difference between them ? Thanks
Yes. I'm a heavy equipment mechanic and LS is how Caterpillar, Deere, Volvo etc refer to these "supply on demand" systems whether rexroth or other manufacturers.
Thanks for the great video. I am working on a project that will involve this type of hydraulic system and the pump I am considering is a Rexroth just like the one in your video. The problem I am running into is that the pump I am looking at does not have the DFR control housing attached to it. Would you know of a part number for just the DFR control block? Possibly where to get one from?
I don't really deal with any of that - I'm simply working with heavy equipment applications who all use their OEM part numbers. Any hydraulic shop that deals these sorts of pumps should be well versed though i would think. Good luck.
I would like to know more about this particular pump bcoz I can assemble it but don't how it works and it's always passing the test results please pin me
I could sure use some help on my asv rc 100 tractor with a rexroth pump I get a time delay when the lever is moved for track movement it is slow to respond to the movement of the lever
Although also Rexroth, that would be a hydrostatic pump- doesn't have anything on it like this control at all. Servo or pilot control from the cab likely just operates the servo on the pump... I can come up with 10 or 20 different things that could cause hesitation, Need someone who knows their way around hydrostatic systems to check it all out. Cat, Case and a lot of skidsteers use the A20 or A22 Rexroth type pumps that I *think* are on a ASV
the "X" for load sense signal is cast into the metal from factory. The tagwire with a cardboard tag and handwritten X is the drain passage into the case.
Really appreciate this 2 part series. I now understand this WAY better, seeing the components and the detailed schematic breakdown. Excellent videos.
I am a new Hydraulic maintenance engineer in the cement industry. Your video was very helpful for me thank you very much Sir.
a masterpiece for explaining DFR controllers of BR. never ever seen such a great work thank you so much
You were my favorite teacher when I went to school! Awesome guitar player too! Learned so much from you!
awesome explanations. thank you. i've been struggling with this for a while - but after your explanations and visual walk-through, everything that i was being told has suddenly clicked together. i understand what is happening much better now, and why these components are important.
I forgot to explain why standby pressure is higher than margin. oops. I'll do a 3rd video on these controls. I want to talk about electric control of l/s and also about torque limiters anyways so I'll cover all that in the next one.
waiting for part 3
any hope for part3?
Any chance of that third video soon?
hystat
Thank you so much!! I loved the 2:45 clip. And thats why we still here. We learn every day. Big blessings. Thank for the video!!
This is one of the better explanation of this type of pumps I have found. Thanks for your effort. It wud have been nice if you had explained in what real world situation, wud the Pressure Cut Off work or come into action.
Very good explanation thank you very for your efforts to share knowledge and information. Thumb up❤
Awesome video! Thank you for helping me understand the pumps operation. You are an excellent teacher.
Thank you very much sir, we learn a lot on this channel
Thanks alot sir. Learn from Myanmar. North Asia.
very nice explanation using a cutaway. very helpful. keep'em coming. thank you!
Thanks for taking the time !! The Fog lifts as the mystery is explained !! lol
Awesome video sir very very knowledgeable thank you so much for this video 🙏
very nicely explained
excellent explanation and demostration
Great video really helped me out ! Just a question, if my squash plate seems to be stuck in low flow which creates slow hydraulics, which one should I be adjusting ? I have a John Deere 230clc if ever that can help ! Thanks have a good one
Thank you soooo much for such awesome videos! Looking forward for more🙏
Thank you for explaining this so well detailed!
i got this pump on my 3,5 ton Pel job excavator but it just seems like it keeps pushing full oil.
I know:
the load sense signal is 0, but a high pressure comes from the pump to the load sense signal (tested that with open lines).
the pump draws full engine power while not being operated and the engine can't get over 1800rpm...
the pump does listen to the standby regulator as the powertake becomes less when i run the standby regulator out.
I got a extra power regulator on the side of the pump which i plugged up, so that aint causing it either at the moment.
i tried a different new regulator of a same pump, but same issue.
To me it really looks like the destroke piston is having an issue and isn't returning completely out, or the spring must have broken or something like that.
Could you maybe give me your thoughts on this issue?
Watched both vids , great explanation. I've got a Volvo ec 60e that uses open center negative control . Be great if you could do the same type video explaining that and how it differs from your CCLS system . Thanks
This was very helpful to understand the Load sensing system. Would you like to do a Zoom education session to our trainees via Zoom. We are a Trade School in Sri Lanka. However due to Covid 19 lock downs & outbreak our study limited to online. Which make difficult to get the overall learning environment. Such as practical training. Thanks for your Video any way.
this is so helpful thank you.
Thank you Sir, you are excellent guy thank u again ,
Thanks for sharing nice information
Please explain difference between DR controller and DFR1 controller , basic difference is DFR1 control both pressure and flow . If we use closed loop DCV then how both type of controller will make any difference? What benifit we have to choosing DFR1 over DR? As both has almost same internal circuits.
Love the videos! Helped me out so much
Hi there,
Thanks for this great explaination. Can you also please explain how hydraulic pumps for Komatsu PC200-7 & CAT 320D work?
Thanks once again
Nice explanation , well done
WAITING FOR THE VIDEO OF TORQUE LIMITOR CONTROL (DFLR CONTROL).. PLEASE EXPLAIN IT THE SAME WAY U HAVE DONE THE PREVIOUS CONTROLS... AWESOME ...
I've seen those pump control valves just like the one you have cut away there leak the load sense pressure so then the system won't build the correct amount of pressure. I've taken them apart and inspected them but never find anything wrong but after installing a new valve on the pump, the system works correctly. Any idea where in that valve the problem exists?
very nice detailed information ..thank you!.
waiting for the vedio explanation of torque control DLR control..please do it soon..
Realy nice ...
But i can not understand difference between load sensor and servo valve ?
Hello your a good instructor have never had such an explanation .Do you have lessons for hydraulics would like to subscribe to them
@hystat Is there a power-limiting valve to prevent the diesel from stalling in this setup, or where would it be located if it had one? Rexroth manuals refer to this as "LA", which is a relief valve that overrides/lessens the LS pressure signal and destrokes the pump in case the combination of flow and pressure exceed the power of the prime mover (smaller then the pumps corner power). Any idea about this?
boss thank you ❤
Like the video man. Have a question you may have an answer for. That looks like an a10vso28 or 45. Clockwise rotation. And the way that comp is on there in my experience doesn't usually operate correctly. Is that a standard dfr/dr compensator? I build and test these daily for a living and I've never come across one of these with comp controls facing your inlet port. Very informative video regardless. Im just hoping I might learn something. And also is that a caterpillar pump?
Yes Cat 416C I believe. All the ones on Cat, Bobcat, Volvo etc that I have seen are built this way around.
@@hydraulics hey thank you for the info. I mainly deal with rexroth pumps. So cat and John deere show up now and again. But im not nearly as familiar with their design quirks.
My small fishing trawler has a pump which looks similar but I have a manual lever on the pump which I can use to give low through to high flow, I then have a normal two way control valve on the winch, is that some kind of load sensing pump?
Thank you for your effort to explain pump control.. but I want to be sure from a point
You said in this video (DFR pump means load sensing ) while in RR catalouge for pump A10VSO for example say just DFR not load sensing
My qestion
Is DFR means load sensing ??
Or there is difference between them ?
Thanks
Yes. I'm a heavy equipment mechanic and LS is how Caterpillar, Deere, Volvo etc refer to these "supply on demand" systems whether rexroth or other manufacturers.
thank you for the educational video
Thanks for the great video. I am working on a project that will involve this type of hydraulic system and the pump I am considering is a Rexroth just like the one in your video. The problem I am running into is that the pump I am looking at does not have the DFR control housing attached to it. Would you know of a part number for just the DFR control block? Possibly where to get one from?
I don't really deal with any of that - I'm simply working with heavy equipment applications who all use their OEM part numbers. Any hydraulic shop that deals these sorts of pumps should be well versed though i would think. Good luck.
great
thank you
Is there a video on the AA4VG71EP2D1 proportional valve that controls the swash-plate?
Nice
Excellent
am trying to understand how the ls valve and pc valve work in an hydraulic pump . could you make a video about it .thank you
Can any one tell me why these 2 valve used (Pressure comp and LS valve) while one valve able to control the swash plate?
Good 👍👍👍 👍👍👍
I would like to know more about this particular pump bcoz I can assemble it but don't how it works and it's always passing the test results please pin me
thank my teacher
how the load sensing spool works not explained when certain pressure drop is reached across dcv.you only explain the upstroke and destroke pistons.
I could sure use some help on my asv rc 100 tractor with a rexroth pump I get a time delay when the lever is moved for track movement it is slow to respond to the movement of the lever
Although also Rexroth, that would be a hydrostatic pump- doesn't have anything on it like this control at all. Servo or pilot control from the cab likely just operates the servo on the pump... I can come up with 10 or 20 different things that could cause hesitation, Need someone who knows their way around hydrostatic systems to check it all out. Cat, Case and a lot of skidsteers use the A20 or A22 Rexroth type pumps that I *think* are on a ASV
thanks 10 or 20 things possible even one is probably over my head
Super
Nice job!
Thank you
A10VS045DFR/30R-P
PA12K 25 is there any agent who are selling such hydraulic pump.
Thanks a zillion!
What is linda?
any part 3 yet?
DFR & DRF means??? Full form??? Please any body
what type of machine is this pump off of?
Cat 416C I think.
I appreciate it buddy
How to rexroth pump service please shearing me
THANKS
Thank u. ...
at minute 0:35 you say X is for load sensing line and later on you say X is case drain connection... I am confused...
the "X" for load sense signal is cast into the metal from factory. The tagwire with a cardboard tag and handwritten X is the drain passage into the case.
Muito bom.
please enable translation options
Hi there is any video how to setting rexroth amplifier card VT5041-31/3-0 do you know please share some video
sorry - I'm a heavy equipment mechanic so I don't know any of that
@@hydraulics OK thank you
if the machine is idling whow the pump works
english captions please
Hi
sorry DFLR control..
Simranjeet