Particle Count & PQ Examples

[Stinky Peterson]

I thought I would share some transmission reports that show how particle count and PQ helps find problems. These reports also show some of the limitations of elemental analysis and how big particles go undetected. The samples are from big transmissions but they are not that much different from a car or truck transmission.

Example 1: Wear elements normal, Particle count high.

Example 2: Iron slightly elevated but compartment unknown and no history.

Example 3: Particle counts high, other elements following trend.

Example 4: Iron slightly elevated, Particle count and PQ very high.

 

[Johnny]

Very interesting stuff. Thanks Stinky.

 

[MolaKule]

My experience is that dust and dirt (silicon) usually come from bad shifter tower seals and boots, and tail shaft seals.

I have a Nissan Frontier that has always leaked a small amount from the shifter tower seal. So you know that if fluid is leaking out, extraneous particles are getting in.

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"Never have so few ruled so many." Regarding the 'Men in Black' of the Supreme Court.

 

[Shannow]

Molakule,
was at a power systems seminar a few months ago, and there was a presenter talking about oil analysis on high voltage transformers.

Made a very similar point.

If a gasket is weeping to atmosphere, then oxygen is difusing in, and playing havoc with the insulating qualities of the oil and paper.

leaks aren't just a cleanliness issue.

(unless it's my Pommie steam turbine that never needs an oil change).