hydrostatic heat and whine
- Thread starter rick480
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dex3361
Elite Member
- Joined
- Aug 22, 2008
- Messages
- 3,494
- Location
- N. of Charleston WV
- Tractor
- Kubota L4400-1 HST,FEL, 3x3 remotes, TNT. BX1500 54 mmm
Thanks I will give that a try.
Couple of added comments to Rick480:
1. It's normal for the hydraulic fluid to get pretty darn hot during regular operation... 150-180 degrees off the top of my head. If you have access to one of those infrared thermometers, maybe you can get a better sense of just how hot it is on your machine. Over 200 is definitely not right.
2. BX's want to be run at wide open throttle, or nearly so, for sufficient hydraulic flow. If you are running at lower rpm, it will whine more and get hotter, as mentioned. Kind of at odds with going easy during break-in, but that's the way they are designed. I backed off the rpms some and used low range mostly when mine was new, and didn't use it for mowing a lot until it had racked up some hours.
1. It's normal for the hydraulic fluid to get pretty darn hot during regular operation... 150-180 degrees off the top of my head. If you have access to one of those infrared thermometers, maybe you can get a better sense of just how hot it is on your machine. Over 200 is definitely not right.
2. BX's want to be run at wide open throttle, or nearly so, for sufficient hydraulic flow. If you are running at lower rpm, it will whine more and get hotter, as mentioned. Kind of at odds with going easy during break-in, but that's the way they are designed. I backed off the rpms some and used low range mostly when mine was new, and didn't use it for mowing a lot until it had racked up some hours.
B2400
Platinum Member
- Joined
- Jun 13, 2003
- Messages
- 585
- Location
- Western Illinois
- Tractor
- 2016 B2650 ROPS, 1998 B2400 (sold!)
In general, hydraulic fluids should run 80-100F above ambient temperature.
Bret Mc
Bronze Member
Since this post came out my buddy down the road stopped to see my new 3030, while looking at it he asked me if the trans. & rear end got hot during use like his 2920,(trans. fluid was full) I guess that is something I never thought about as I have only had it a few weeks, so after mowing about 1 hour Sunday (80 deg)I took a temp gun that I use for my RC trucks and checked it, the temp. gun showed 171.5 deg. I would have to say the heat is normal as compared to a automatic trans. in your vehicle, it's a pump circulating fluid to move a heavy object, as for the whine I'm going to try SUDT at my 50hr. service to see if it helps with that, this is my first hydro so all of this is new to me but I really like the tractor.
Volfandt
Veteran Member
Good info.
The HST's pump section relies on air being moved by the fan for cooling it. It only stands to reason that the faster that fan is spinning, the more air it'll move over the HST where it's needed.
Lugging these little diesels is much worse on them than running them all day long at pto rpm.
Theres been a few folks that have posted pics from their heat guns showing cold then hot operation of their HST's and when warmed up to it's operating temps, the HST averaged 80 to 100 degrees hotter than the current ambient air temperature. In the case the air cooled HST of the BX, the higher boil point of SUDT is a plus.
FYI, Theres an additional wire connection under the BX's seat and on the older BX's it would lite another "mystery" warning lamp on the instrument cluster. It's been speculated that this was an HST overheat warning lamp for Kubota markets other than the N. American market but no one has verifed this. It's also unclear when this warning lamp was removed on the newer BX's. It was discovered when some enterprising individuals were looking for additional electrical power for rear lights etc. Seems when that particular lead was grounded is when it would illuminate the "mystery" dash lamp. If one were to try this on their BX be advised that grounding the wrong lead will blow your 20 amp fuse and you'll loose the ability to shut your engine down via the key switch
Dave