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ISO 4406 v/s Mothorized Wheel of the Komatzu 930E

Dear Folks,

We're monitoring the ISO code in the motorized wheels of the Komatsu 930E, before and after the microfilter process with a filter of 1 microm beta 1000, and in several times we had obtained higher ISO Code in the filtered samplem than in the one non filtered? with the same sampling process, the lubricant is an ISO VG 680, the sample is diluted before run in the APC, can someone provide ideas about this topic?

rgds, pedro.
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