New BX problem?

[TresCrows]

I do not think mine makes that particular noise but it does make a bunch of funny noises--it is a tractor--not a Lexus. Tractors make noises. If my Tundra did all that I would be worried, my 'bota--no--it is a tractor and for the most part all those noises we tractor newbies are hearing are normal. J

 

[r0GuE]

Trescrows, I understand what you are saying but I think if you heard it you would say "jeesh thats messed up". It sounds likea can of nuts being shaken and it is very repeatable when lifting the deck at low RPM.
They pulled down another and it had a hint of the noise. They pulled down a third and it did not do it. That tractor will be delivered Tuesday!! "grin"


Rogue

 

[TresCrows]

Roque, do not think I am flaming you but it is unlikely that three could be defective. I figure that they are just new and need some use. Of course, yours may well have had a problem and I certainly hope the new unit works out for you. My tractor makes all kinds of noises, most are swishing, whirring noises and whinning noises. Someday we will have to get a manual on these things and study up on what goes on in their inards that contributes to the assemblage of noises. The 7500 I demoed made about the same noises by the way, it kinda made a tick, tick, tick sound whereas my BX goes tock, tock, tock /w3tcompact/icons/smile.gif . Take care, my fingers crossed for you. J

 

[r0GuE]

No worries Trescrow! I don't think it is defective either. I think it is just a quirk in the machine. The first I had (and still have for now) is loud. The second they pulled down was a faint hint of that sound. So only 2 machines. The third does not make it at all. I am relitivly certain that it is not a major defect. That said, my $10,000.00 lawnmower (for now I only have the 60" deck as an implement) will not make the noise. Of course mabey it will after a few dozen hours. That would be ok. I just hate to hear an offensive sound like that and have the delivery boy in the driveway still. He was from their New Holland shop and he said "jeesh thats messed up".

Rogue

 

[Anonymous Poster]

Ours makes a similar nose but seemed less noticeable after a few hours (or I'm going deaf). I was of course concerned, went down and listened to a few others and all the others had the noise.

I just tell people that Kubota has found no way to keep the turbocharger vanes from rattling when they are not under load from the exhaust /w3tcompact/icons/wink.gif

del

 

[kerr]

This is easy,get the quite one just like everone else would!As your common sence tells ya.Let the daredevels try to ignore them strange noises.my 2 common cents.

 

[Myles]

Ok, now my wife is ready to sell the BX. First I'm out playing and joyriding and "working", now this thread has me out there "listening" to my tractor.....

"What are you doing dear?"

"I'm listening to my tractor."

Not to worry yet...I haven't heard it speaking so far.... No really "strange noises" Some whines at certain rpm's.....I think I better try listening to my wife....or at least look as if I am

 

[r0GuE]

Whines and hisses are definatly normal. Remeber, bucket of bolts is what we are talking about. I'm sure yours is fine.

Rogue

 

[TresCrows]

Here is what I think is happening that causes the sound you here. It is just a guess on my part and I full admit I am not up to speed on the inards of a BX or any tractor for that matter so it is an extrapolation of what I know about aircraft hydro pumps and systems. The transmission consists of two rotary piston pumps, one is fixed displacement pump and the other is a variable displacement hydro motor ( a pump driven by another pump) via a swash plate mechanism connected to the hydro pedal. I believe there to be a third pump mechanism, the pump for the hydrualic output and this is probably a fixed displacement pump which on the BX delivers 5.5 GPM at working RPM which I figure from the manual on the loader occurs at 1800-2200 RPM on the engine. Since it is fixed displacemnt it's output can be low at idle and rather high at full engine speed. I figure there is a Loading valve (not FE loader valve) and also a pressure relief and or bypass valve which allows excess fluid to bypass preventing over pressure at full engine speeds or in event of an obstruction. The 3-way/4-way valve is also a loading valve which allows the open center-continuous flow to be directed to the cylinders on the FE loader or accessory. The Hydrualic steering is also powered by this (3rd?) pump and the 3-point arms and the mower lift which operates without the accesory 3/4 way valve being installed are powerd by this pump as well. That is why I figure there is another loading valve which is actuated by the lever on the right hand fender to power those items. Since the disturbing noise--the can of rocks rattle--was on a new unit with possibly slightly low fluid and occured at or near idle I figure this internal loading valve is the culprit. It is new, stiff and not designed to operate at low engine RPMs so it chatters. If the fluid is low some air may be into the system also compounding the valves problems. Time, proper fluid level and the engine operating at a normal working speed--1600 to wide arse open the valve should not rattle and will operate correctly. That is my guess on the "noise" and is why I figure it is a normal condition. We generally do not allow our pumps on aircraft to do such things cuz they cost more than a truck load of BX's and lives may hang in the balance but for a tractor the occasional chatter due probably to low RPM more than anything is of no real concern. I could be entirely wrong and freely admit at not being a tractor mechanic--just my best guess as to what the noise might actually be without knowing more. J

 

[r0GuE]

We thought it may have been air in there somewhere as a possibility also. You could be right. You bring up an interesting (to me anyways) question. I'll put it under a new thread so others can see it (search it).

Rogue