I have an early John Deere 310A loader backhoe (lb) The engine was seized from rain down the stack and I fixed that. It had sat for a couple of years for that reason. I have checked the hydraulic fluid and the level has always been good. I have change the two filters and cleaned the screen and found virtually no debris in the way of metal pieces or chunks; only the slights amount of debris. The hydraulic system is "chirping" right after startup. It sounds fine when it starts. Then about 2 or 3 seconds later, the hydraulic "system" starts chirping. It is a high pitched chirp sound. It seems to be coming from the hydraulic pump. Hard to tell. It also sounds like it is coming from the transmission area when I am in the cab. One mechanic says it is the front hydraulic pump. (I almost hope so...since it is the easiest to change.) I am wondering if it is a valve malfunctioning somewhere. Lastly, I hope is it not the feed pump in the transmission which looks like the devil to change. Before I start throwing a lot of time, work, and money at it I would like to get as much input about a solution as I can. Thanks for you help in advance. BA
Chirping Hydraulic system
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Billrog
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Are you sure it's not the fan belt ?
tree farmer
Silver Member
I would check the suction pickup and tubing for clogs or debris. Pump maybe starving for oil or cavitating, neither of which is good for the pump....Dan.
Well, I think I uploaded a link to a movie w/ the chirping backhoe. Can you please check? Thanks for the inquiry!!
Tx Jim
New Member
Welcome to TBN
Keep in mind many hyd pumps have been replaced in the past to find out that the replaced hyd pump was not at fault!!
Closed center hyd systems require ""good diagnostic procedures"" due to frt pump inability to suck oil & requiring oil to be supplied. I suggest to check to be sure hyd filter relief valve isn't stuck open. Chirping sound could be stroke control valve in frt pump that controls hyd pressure might not be seating properly. I suggest to acquire a 5000 psi gauge & check stand-by pressure which should be 2350 psi
Keep in mind many hyd pumps have been replaced in the past to find out that the replaced hyd pump was not at fault!!
Closed center hyd systems require ""good diagnostic procedures"" due to frt pump inability to suck oil & requiring oil to be supplied. I suggest to check to be sure hyd filter relief valve isn't stuck open. Chirping sound could be stroke control valve in frt pump that controls hyd pressure might not be seating properly. I suggest to acquire a 5000 psi gauge & check stand-by pressure which should be 2350 psi
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Tinhack
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An old suction line can collapse too. I had to replace the one on my old JD 420C that uses a front pump for the dozer blade and boom. Problem can also be a clogged suction strainer at the tank too. In other words, don't rule out the supply side.
Thanks. Great info. I will get that scheduled as it is buried in snow right now. I will probably do the paper trail for now to see how to identify this stuff. BA
Thanks. Another gentlman suggested a similar approach. Many thanks BA
K5lwq
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The link did not work for me but I copied and pasted and it worked. Not long enough for me to understand what I heard but it definitely is there.
I reposted it for you.
www.dropbox.com
I reposted it for you.
Dropbox
www.dropbox.com
Thanks and thanks for reviewing. The chirp is not there upon startup and then starts right before I say "there it is...." That is it. That is all the length I could get out of the phone. BAThe link did not work for me but I copied and pasted and it worked. Not long enough for me to understand what I heard but it definitely is there.
I reposted it for you.
Dropbox
Tx Jim
New Member
I suggest after checking trans pump GPM to isolate hyd components control valves. I think chirping noise is stroke control valve.
Zebrafive
Super Member
Can the drive for the front pump easily be disconnected? If so, isolate the front pump that way and see if chirp is still there.
Billrog
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Does it change with the rpm of the motor ?
rScotty
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OK. That linked to a downloaded URL which turns out to be a your drop box....at first I thought I'd have to sign in, but I clicked it and it played. Short video, but it worked to hear the sound. "There it is"
First off, I hear the sound. I gotta say that my first impression was that the engine sounds good. Second, I've no idea what that tsking sound is. Does it change at all if you work the control lever? Mine made a sound sort of like that when it had a sticky cylinder - but it only did it at one point in the cylinder movement.
No idea what it is. Could it be a relief valve? Ice in the hydraulic oil?
My only idea would be to try it again on a warm day. Or else rig up a hydraulic T to a pressure gauge and see if the noise happens when the pressure fluxuates. Not sure what that would show, but all of us tractor guys ought to have a a pressure gauge on a QC "T" fitting that we can move around for diagnosis. My gauge simply lives on the tractor still in whatever line I checked last.
rScotty
rScotty
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Oh.. one thing to check is to crawl under the tractor and look at the rubber suction line to the pump. See if it is seeping oil when sitting and not running. Look particularly at the ends of the rubber hose. If that hose it is wet on the ends when sitting, it may be sucking air when running. Mine was, but hadn't gotten to the point of making a sound.
"change when worked controls"? No, however at idle once, one of the leveling arms had bled off and I raised it and it raised rather jerkily in sync with the chirping sound. No sound change though. Has plenty of power otherwise and chirp speed increases with engine speed. The video is a warm day. Ran it some in the cold, but the chirp was the same. Thanks. I will start inspecting the relief valves. I understand some are electric.
Great idea!! Thanks. I am snowed under right now but will do so in the spring. I may dig it out so it is only snowy and cold instead of soaking wet, and cold. !! That is a very good point as I can tell from some of the other condition of systems that it was likely neglected or has failed with old fashioned time. BA
