Nitration in Hyd fluid

Dear Jim,

Detecting varnish problem is difficult.
UC showing level 4 is indicating that you are in marginal area.
and you also noted there that severe varnish was observed.
I am advising you to compare with other parameter i.e:
> Oil color (ASTM 1500), if it is more than 5, it is a warning
> You can try also to check the varnish rating (http://www.machinerylubrication.com/Read/1027/varnish-potential-analysis)
> Also combine your analysis with the trending of Oil Filter Delta Pressure (DP). The increase in DP from 0.3 bar to 1 bar, for less than 6 months is indicating something wrong in the oil.

Normal or Abnormal is your decission, because you know better your equipment.
The lab just analyzing the oil test result from the available parameter.

Regards,

.

Dear Jim,

UC level 4 is marginal (begining of alert)
I am advising you to combine with other analysis i.e:
* ASTM 1500 Color code. If it is more than 5, varnish buildup shall be considered
* Varnish Potential Analysis (http://machinerylubrication.com/Read/1027/varnish-potential-analysis)
* and combine also with system monitoring data, like the trend of oil filter delta pressure (DP). the increase of DP from 0.3 reach to 1 bar below 6 months is indicating something wrong in the oil.

Normal or not is your decission.
The lab is just analyzing the available parameter.

Regards

Just wanted to give some feedback on my findings for root cause of the insolubles/varnish. This was due to microdieseling at the pump suction. This is a lift style pump on top of the hydraulic unit.