Peoples.
I would like to have your suggestion regarding to the attached.
When you see the spectrum & TWF....what the main problem you see in this gear box.
1. Gear wear out.
2. Bearing wear out.
....possibly misalignment can be caused by bearing wear out. Anyway, what do you think.

Regards

Gear_Box.xls (89 Kb, 85 downloads)

Phoo,

Possibly a pinion gear fault (input shaft).

Walt

SE specrtum is evident of impacting at 1x. So, it has either extensive wear or cracked/chipped tooth. There is also gear misalignment present with GMF being sidebanded as result. If possible take TWF of 2-3 pinion gear revs with higher resolution in order to better see meshing/impacting in each of the pinion teeth.

This hay stack left to 2xGMF which appears to be modulated by 1x pinion ... Are they SBs of 2xGMF or possibly it is gear resonance caused by internal impacting?

Gear box inspection is warranted IMO.

This message has been edited. Last edited by: David_G,

quote:

Gear box ispection is warranted IMO.

Could you please explain meanining of the above sentence.

Phoo,

If "IMO" was confusing, it stands for In My Opinion.

Again, there are sufficient number of symptoms to suggest inspection of this gear box.

Thanks David_G
I had opened the window of gear box, just can look at the gear (Output). The gear dose not have a broken tooth but I can feel by my finger that the gear was ripped.
I have 3 units for this pump....unfortunately, they are running with the same symptoms.

Good Luck

More formation

pic_gear.doc (398 Kb, 37 downloads)

Your 42 x 52 gearset has two assembly phases so keep in mind that if you disassemble it is important that you mark the teeth in such a manner that they are indexed the same upon reassembly. Otherwise you are asking for trouble ni terms of high wear rates until a new wear pattern develops.

If I read the pictures correctly there is heavy pitting all over the teeth and wear pattern consistent with misalignment. Looks like this gear box is on its way out..

Guys...
I just put the dial indicator on the output shaft and found total Gear Backlash = 0.8 mm., total Axial End Play = 0.15 mm.

The input shaft speed = 1480 rpm, output shaft speed = 1832 rpm.

Is it suitable for the numbers of Gear Backlash and Axial End Play.

Thanks in advance
Phoo.

Backlash is normally measured at the pitch line. It can have a wide range of values but typicaly you'll find numbers in the 15 to 30 mils region or .4 mm to .8 mm. Your value might be high, I emphasize high as I don't know at what radius you mounted your measurement device.

On the axial measurement, again without knowing some details it is difficult to say it is OK or Not OK. You probably should go back to the manufacturer.

John

I disconected coupling and put dial indicator on the shaft ridus then move the shaft forward and backward in rotating direction. So, the backlash allow the shaft can be moved free 0.8 mm.
Just the way I can do, Dose the number can rise more than 0.8 mm. if I measure at pitch ridus...(Did I ask stupid question )

I have to make sure what I going to do when open the cover of gearbox. Anyway, I will try to contact the manufacturer in parallel ways.

If you have any opinion please go on.

Thanks