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What makes a hydrolic pump whine in a bobcat 331 mini excavator?

Changed hydro fluid/filter and did'nt help.

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It is either low on fluid or it is defective, only two reasons I know of.

Posted on Feb 22, 2012

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Posted on Jan 02, 2017

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How to remove front idler on bobcat 331 mini excavator


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Dec 25, 2015 | Mini Cars & Trucks

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Hello, I have a bobcat mini excavator. Mitsubishi motor.. if I was to guess the year its maybe a 2001 or up.. it has a little over 1400 hours on it. Oil & filter was changed at 928 hours... While it...


It could be locked with oil in the cylinder. Remove the injector and turn the engine by hand to expel the oil. Top up the engine oil and refit the injector. If the engine won't turn with the injector/s out then it is seized and needs rebuilding.

Mar 11, 2017 | Cars & Trucks

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I have a 94 s10 v6 4x4 . It's a standard with a


the rear pump in your transmission is bad im sorry to tell you this but you may need to rebuild or replace your transmission you can try to do a filter and fluid change make sure you put in a bottle of lucas transmission fluid

Sep 20, 2012 | Cars & Trucks

1 Answer

My 52 mini suddenly started making a whining noise, its an automatic, i didnt get any any warning it ciasts fine and reverses but once you put your foot on the accelorater the whining noise slows the car...


Check your transmission fluid level, as recommended in the Owner's Manual. Also, if your car is equipped with power steering, check the fluid level in the power steering reserve.

If all fluids are at recommended levels, see if you can locate the noise. If it is in the engine compartment, try to determine if the noise is coming from any of the serpentine belt pulleys.

Sometimes the bearings on air injector pumps fail in higher-mileage vehicles, first causing a "whining" noise, and ultimately resulting in the serpentine belt "chirping" or squealing on acceleration. Best you can do is make sure all fluids are at recommended levels, then try to pinpoint the source of the whining noise for further diagnosis.

Hope that's helpful!.

Jul 01, 2011 | 2002 Mini Cooper

2 Answers

Whining when i press gas


normally, the only part of your automatic transmission that will make a whining noise is the pump. it usually whines when iether the fluid is low or more commonly when the transmission oil filter is getting plugged up.

the power steering pump will also make a whining noise too.

turn the wheel all the way to the right and hold steady pressure against the stop. this puts maximum force on the power steering pump and, if the power steering pump is the one making the whine, it will change the sound of it. (usually louder).

if the trans pump is making the whine noise, it should sound different in neutral compared to drive. this test will really only work if it make the noise without the vehicle moving. if it wont do it at idle hold the rpms at 2000 or so.

if you decide the noise is coming from the transmission, and the transmission filter has not been replaced (assuming you installed a used transmission), replace the filter by removing the oil pan.



oh and also, if it is the power steering pump you should be able to make it make the whining noise while the vehicle is stationary. if it wont make noise unless its moving its not the power steering pump.

Mar 23, 2010 | 2003 Chevrolet TrailBlazer

1 Answer

2002 chrysler sebring top retracts fine but requires assistance to close. whining from hydrolic motor heard on driver side.


Low fluid level in the pump resevior due to a leak at a hydrolic cylinder allowed air instead of fluid to fill the cylinders.
I then removed the pump from its mounting and elevated it as high as the connected fluid lines would allow, removed the plug,filled with trans mission fluid to within a 1/4" of the fill hole. Then cycle the top pausing at each end for 15 seconds to allow air to purge from lines & cylinders.
Recheck fluid level and plug fill hole.
Note: As of 1/18/2010 the cylinders for this model were on nationwide backorder and 300 request were in front of mine at the dealer level.
Good luck with your search for parts.

Jan 18, 2010 | 2002 Chrysler Sebring

3 Answers

Steering makes a whining noise - where is the fluid reservoir?


the suspect part for a power steering whine is the power steering pump, flush (very important) the system and replace the PS pump..

Mar 30, 2009 | 2004 Mini Cooper

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