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2020 NH Workmaster 25 loud whining noise

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droid81
Join Date: Aug 2020
Posts: 2 ny
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster

2020-08-15          199611


my 2020 workmaster 25 whith just under 30 hours just started making a loud whining noise....seems to start when going up hill it will run fine for a couple minutes after letting it sit for an hour or so
any ideas

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2020 NH Workmaster 25 loud whining noise

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Murf
Join Date: Dec 1999
Posts: 7207 Toronto Area, Ontario, Canada
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster  View my Photos  Pics

2020-08-17          199618


Your post is a little light on details but generally speaking hydrostats whine when working hard, are trying to go up the hill in high range and at the same speed you were doing on flat land?


Best of luck. ....

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2020 NH Workmaster 25 loud whining noise

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BeenThere
Join Date: Jul 2020
Posts: 25 Kansas
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2020-08-17          199620


I agree with Murf on the whining noise. It seems all tractors with hydrostatic transmissions make the noise with they are in a stress situation....working and up hill climbing. I've own John Deere 2 series and they whine, and so are the ones in the larger lawn tractors. The 2005 Cub cadet 6384 scares the you know what out of me on it's whining, and I'm searching for the reason(s) why it does it. All the fluids are at peak level and still knowing showing what causes the whine. Probably never know...that is until it stops and so does the tractor. ....

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2020 NH Workmaster 25 loud whining noise

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Murf
Join Date: Dec 1999
Posts: 7207 Toronto Area, Ontario, Canada
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster  View my Photos  Pics

2020-08-19          199627


I was told by a factory CAT tech the whining under load is the pressure relief valve cycling (open / close / open / close) at extremely fast speed against high system pressures when the machine is under heavy load.

It's much the same sound as a FEL makes if you dead head the hydraulics, like holding the joystick in the curl up position after the cylinder is fully retracted so I suspect that is the cause of the noise.

BTW, while I do NOT approve of the method, the tech advised that you can dramatically speed up the heating of the hyd. fluid on cold days by rising the idle a little and holding the hydraulics against the relief valve, like as above using curl up. The constant load and restriction of the valve causes a lot of friction which in turn creates heat.

I'll stick with an leectric preheater.


Best of luck. ....

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2020 NH Workmaster 25 loud whining noise

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Ernies
Join Date: Jun 2020
Posts: 19 Vermont
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2020-09-11          199678


If this site supports it. You might want to post a video of it as every tractor owners interpretation could be different as to what normal sounds are ....

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2020 NH Workmaster 25 loud whining noise

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USMade
Join Date: Apr 2021
Posts: 2 Montana
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster

2021-04-04          200202


My 2002 TC29D whines only when in cold weather during start ups( below 30def). It is only doing it while the hyd oil is cold. After a couple of minutes of moving it it stops. Great little tractor, 3000 hrs on it. I just raise and lower loader some if I cannot wait for it to warm up completely. Good luck! ....

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2020 NH Workmaster 25 loud whining noise

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Samuelmarkwood
Join Date: Aug 2021
Posts: 5 Nampa Idaho
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2021-08-18          200483


Quote:
Originally Posted by droid81 | view 199611
my 2020 workmaster 25 whith just under 30 hours just started making a loud whining noise....seems to start when going up hillit will run fine for a couple minutes after letting it sit for an hour or soany ideas


I just talked to new Holland shop about loader jerking violently when lowering. Also bucket curling up from up pressure. Also about hydraulic pump cavitation. It is designed to do that. Yours sounds worse than that,. Have you checked fluid level?

Mine is a 2021 with 35hrs. If yours jerks please reply

....

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2020 NH Workmaster 25 loud whining noise

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Murf
Join Date: Dec 1999
Posts: 7207 Toronto Area, Ontario, Canada
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster  View my Photos  Pics

2021-08-18          200485


A jerky loader function is normally due to air in the loader cylinders,

When lowering the loader with weight on it and or at slow engine RPM's the loader going down can faster than the fluid can be replaced in the 'lift' side of the cylinder, when that happens it's easier for the cylinder to cavitate (inhale air instead of the thicker oil) up into the cylinder.

It's easy to diagnose & solve though, SLOWLY (in both directions) cycle the loader up & down full extension to full retraction several times with the RPM's up at a fast idle speed. If that cures the problem you either need to add a throttle line valve (basically a choke) on the FEL or just be more cautious about lowering heavy loads.


Best of luck. ....

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