Hydrostat noise question

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mpmitch1

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I just got a 5740 hst. I've never driven an HST, I've only driven a GST for 10 yrs. I hear a noise when underway , almost sounds like an exhaust leak (not a gear whine). But if I'm stationary and Rev it up I can barely hear it ? It's only underway when I hear it....is this normal? Any thoughts
 
torch

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Sounds typical to me. The HST noise comes from the fluid flowing through the system -- no movement, no fluid flow, no noise.
 
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loggin

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mpmitch1 said:
I just got a 5740 hst. I've never driven an HST, I've only driven a GST for 10 yrs. I hear a noise when underway , almost sounds like an exhaust leak (not a gear whine). But if I'm stationary and Rev it up I can barely hear it ? It's only underway when I hear it....is this normal? Any thoughts
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Would help if you posted a video with sound to determine if it sounds normal or not.
 
NCL4701

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mpmitch1 said:
I just got a 5740 hst. I've never driven an HST, I've only driven a GST for 10 yrs. I hear a noise when underway , almost sounds like an exhaust leak (not a gear whine). But if I'm stationary and Rev it up I can barely hear it ? It's only underway when I hear it....is this normal? Any thoughts
Click to expand...
A continuous whining sound is normal. The volume and pitch would change with load and pedal position but it’s still a continuous sound.

A staccato rapid fire, straight pipe exhaust sound is not. The straight pipe exhaust sound is what I associate with an “exhaust leak” sound (such as a blown exhaust manifold gasket) and that’s not normal.

As stated by others, a video with whatever the sound is would be instructive in determining normal from abnormal.
 
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mpmitch1

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NCL4701 said:
A continuous whining sound is normal. The volume and pitch would change with load and pedal position but it’s still a continuous sound.

A staccato rapid fire, straight pipe exhaust sound is not. The straight pipe exhaust sound is what I associate with an “exhaust leak” sound (such as a blown exhaust manifold gasket) and that’s not normal.

As stated by others, a video with whatever the sound is would be instructive in determining normal from abnormal.
Click to expand...
NCL4701 said:
A continuous whining sound is normal. The volume and pitch would change with load and pedal position but it’s still a continuous sound.

A staccato rapid fire, straight pipe exhaust sound is not. The straight pipe exhaust sound is what I associate with an “exhaust leak” sound (such as a blown exhaust manifold gasket) and that’s not normal.

As stated by others, a video with whatever the sound is would be instructive in determining normal from abnormal.
Click to expand...
I'll see if I can get a video this weekend. Don't think it's exhaust related since I don't hear it when stationary and Rev it up
 
NCL4701

NCL4701

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mpmitch1 said:
I'll see if I can get a video this weekend. Don't think it's exhaust related since I don't hear it when stationary and Rev it up
Click to expand...
Understand and agree probably not exhaust related for same reason you stated. Just saying if the noise mimics an exhaust leak it’s probably abnormal as an exhaust leak type sound isn’t consistent with normal HST noise.
 
M

mpmitch1

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l3240 with 514 loader, forks, bush hog, disc, boom pole, FEL
May 24, 2012
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NCL4701 said:
Understand and agree probably not exhaust related for same reason you stated. Just saying if the noise mimics an exhaust leak it’s probably abnormal as an exhaust leak type sound isn’t consistent with normal HST noise.
Click to expand...
5740 is substantially louder than my 3240, guess that's the nature of the beast? Turbo, esg, hydro.....ear protection a must when running pto 540...I think my video is too large
 
ctfjr

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mpmitch1 said:
5740 is substantially louder than my 3240, guess that's the nature of the beast? Turbo, esg, hydro.....ear protection a must when running pto 540...I think my video is too large
Click to expand...
put it up on youtube?
 
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mpmitch1

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- YouTube

Enjoy the videos and music you love, upload original content, and share it all with friends, family, and the world on YouTube.
youtube.com youtube.com
 
aaluck

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I don't hear anything. HSTs sound different from tractor to tractor, depending on which fluid you have whether or not your in 4WD. etc, etc on and on
 
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mpmitch1

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l3240 with 514 loader, forks, bush hog, disc, boom pole, FEL
May 24, 2012
74
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madison
Thanks. I bought the 5740 used , it's significantly louder than my 3240 (which I have put 450hrs on). Guess I'm just anxious not knowing the history of the tractor and never running a turbo before. I just need more seat time to gain some confidence in the new orange. Thanks
 
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