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2020 NH Workmaster 25 loud whining noise
 | droid81
Join Date: Aug 2020 Posts: 2 ny 
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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
 | Murf
Join Date: Dec 1999 Posts: 7170 Toronto Area, Ontario, Canada 
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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
| 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
| Murf
Join Date: Dec 1999 Posts: 7170 Toronto Area, Ontario, Canada
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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
| Ernies
Join Date: Jun 2020 Posts: 14 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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