What is the minimum phosphorus level accepted in most gearbox's before sweetening or change is necessary. Gearbox is using an EP gear oil ISO 320 made by a major manufacturer.
Original Post
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Ideally you need to do a base line sample of the new oil to determine what the new value is, then look at 20-30% reduction from that level. Ask your oil supplier for their specific rejection levels.
Regards,
Rodney Fitzpatrick
Regards,
Rodney Fitzpatrick
Rodney is correct depending on whos the mfg is phos levels will vary so run a baseline on virgin oil and then go from there normally wear debris will be the condeming limit not phos or additive depeletion or other concerns such as water ingres.
bruce.
bruce.
For new EP oil this will normally mean FZG 12 stage pass, with an appropriate Phosphorus level according to the additive system involved. Oil change will be necessary when factors dictate this, as per the 2 previous writers. Generally however factors which dictate oil change will be contamination, wear debris or change in viscosity(usually due to incorrect oil additions) and changes in TAN.
How much useful additive is left is more difficult to assess as Phoshorus level is not only measuring useful additive but also spent additive and anything else with Phosphorus in it.
FTIR trace may be one way of helping to assess additive level but where do you draw the line? This must depend on the criticality and loads put on any particular gearbox.
How much useful additive is left is more difficult to assess as Phoshorus level is not only measuring useful additive but also spent additive and anything else with Phosphorus in it.
FTIR trace may be one way of helping to assess additive level but where do you draw the line? This must depend on the criticality and loads put on any particular gearbox.
