B2320 HST Noise

[kenb2320]

Hi All,
First post here! I have a new B2320HSD with about 8 hrs on it. I'm new to HSD transmission and while running my 48" rotary cutter I heard a strange rattle (almost like marbles rattling) or chattering noise from under my seat when the tractor started to labor. I was using Med range and running the engine at 2200rpm. I realize the rpm's are lower than pto speed but my dealer recommended that during the breakin period. I removed the FEL stands and the drawbar thinking those might have been rattling but that didn't make a difference. Has anyone experienced such a noise? I'll have to play around with it somemore but was just curious if anyone knew. ... Could it a pressure relief valve or air in the system? I believe I heard it in reverse also and once doing FEL work but then shifted to Low range and didn't hear it again. I'm still trying to get use to the fact that the speed pedal is not a throttle pedal . I tend to push on it to try to get more power but it don't work that way.

Thanks,
Ken

 

[Ductape]

Have you checked to make sure your PTO shaft is the correct length? That is the first thing I'd look at.

 

[mscott]

Theres lots of smarter people on here then me but my guess is pressure relief.......i'd run it in low

 

[ackerrj]

I have a B2320 with apx 22 hrs on it and use a king kutter rotary cutter, with the tach in the orange area for 540 rpm at the PTO. I do not hear the noise you are describing.

The most stress my unit has worked under IMHO was when using a subsoiler at a depth of 15-18". The noise then was kind of a wooshing sound from the HST, which I was told was normal.

The good news is that you should still be 100% under warranty... Now is the time to catch these things. Don't wait till warranty expires. Just my humble opinion.

Bob A.
Colorado Front Range

 

[ackerrj]

One other thing to check... My rotary cutter drive shaft had a chain attached that made the sound you describe before I removed it. Could it be that simple?

Best wishes.

 

[kenb2320]

Thanks for the replies so far. I believe the cutter driveshaft is the correct length because I can run it throught the whole range of the 3pt hitch without any u-joint noise and the noise in question only occurs when I'm depressing the speed pedal. I'm going to test it a little more this week with the FEL and if I can recreate it that should eliminate anything off the pto, i.e chain, shaft etc. I'm still going to look for something rattling, possibly the pto cover, and vary the rpm's if it occurs. Hopefully it will be that simple! And yes that's a good point, find it now before the warranty is up!

 

[JOHNTHOMAS]

My first thought is you have your revs to low trying to use Med speed. Put it in low or rev it up and see if it still does it. Almost guarantee it won't from what you said about it stopping when you went to low.

 

[kenb2320]

John, I hope you're right! ... but I guess I would still ask "should it do this?" that is should the pressure relief be chattering like that (if that's the noise I'm hearing)? I assume the pressure relief or some sort of pump bypass has to kick in when the hydraulic motor starts to get loaded down but I wouldn't think it should chatter. Maybe at a higher rpm it will open and stay open.

 

[kenb2320]

So I did a little more playing with this. Took the rotary cutter off and did some dirt moving with the FEL. I wasn't as scared to make the noise occur as the first time. The noise I'm hearing is more of a squealing or screeching noise and occurs when the HST begins to stall. So I'm assuming it's the pressure relief valve. My question now is "is this a normal sound of the pressure relief valve cracking open and allowing bypass flow at high pressure?". Do others hear this? or should I have the pressure relief setting and or valve checked by the dealer? Also, do you think it will quiet down as I get more hours on it or after the 50hr service?

Thanks!
Ken

 

[kuboman]

The hydro relief should not go unless you are really overloading the tranny. I can't think you are overloading anything on a cutter. One rule of thumb with hydros is to maintain your set engine rpm with your speed pedal. if you do that you will not over load anything. Once the rpm start to drop backoff on the pedal. Either you are mistaking a normal sound as a problem or you have a problem. I have run many hydros and all they do is start to whine really load when they are being overloaded.