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Sulphur - Phosphorous EP attacking yellow metal gears

A andrewcoxMember
I have read that sulphur - Phosphorous EP additives can attack yellow metal gears @ high temperatures. Has anyone heard of this before? And if so can you please let me know where I can get more information? I am interested in this as our copper and tin (Bronze) levels are constantly high in worm drive gearboxes and I would like to know if the additive is influencing this? I will do WDA to identify wear modes being sliding (contamination issues)or if you can see the metals being attacked by the chemicals.
Any help or ideas would be greatly appreciated.
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R rodneyfitzpatrickMember
Yes it is quite common for EP additives to be aggresive in yellow metal worm drive gearcases. Typically when you are looking at the gearing it looks like spalling (large chunks missing) has occured on the gear teeth. There are specific non S/Phos EP oils for these applications, or there are some which do have S/P but do not act as aggresively. Link below to our complete range of worm gear lubes for your info.

http://www.le-international.com/products.aspx?subcatid=11

Regards,

Rodney Fitzpatrick.
A andrewcoxMember
Hi Bruce,
This is what the results usually come back with. Sometimes the PQ and silicon are a bit higher which I have been told may be the main contributor.

Worm drive conveyor approx 15L
Lead 2
Iron 2
Aluminium 1
Copper 253
Chromium 1
Tin 40
Nickel 0
Silicon 13
PQ 2
Water <.1
Phos 530

Is there any literature to support the S/Phos theory or is it mainly here say?
R rttechMember
Hi

yes I agree with Bruce, the lack of ferrous wear indicates chemical wear rather than abrasive wear or adhesive wear and its expected the Cu will be elevated using Chemical EP gear lubes (everyone does)
we had the same question this week from a long wall mining machine supplier and in that instance the PQ and Fe were around 300 and Si was 80, his was three body abrasive wear wearing all metals in the drive, your is not, only the non ferrous metals so most likely chemical wear which the drive should tolerate as Bruce explained

regards

Rob S
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