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gear box oil for yellow metals

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gear box oil for yellow metals

Posted by anna jeannette Dixon at July 11. 2018

Hello guys and Gals  I have found a Castrol gearbox oil for yellow metals IE bronze bushes in side your gearbox  its made by Castrol ST90 is just that bit more suited to Norton gearbox's  So now that what I be using yours  anna j

Re: gear box oil for yellow metals

Posted by stefan_koop at July 11. 2018

Hello Anna,

 

i use the castrol classic EP90. It's GL4.

 

stefan

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Re: gear box oil for yellow metals

Posted by anna jeannette Dixon at July 12. 2018

Previously stefan_koop wrote:

Hello Anna,

 

i use the castrol classic EP90. It's GL4.

 

stefan

Hello Stef   its is said that EP 90 is not very kind to the bronze bushes  inside the gearbox  but this ST90 is kind to your bronze bushes  So in effect we been told wrong about EP90  Has I was talking to Castrol over the phone the other day  ep means extreme pressure use with in the gearbox  our old bikes are not under that much of pressure  when running     yours   Anna J

Re: gear box oil for yellow metals

Posted by paul_standeven at July 12. 2018

I took a look at Castrol's website for a description of the ST90 oil. This is what it said:


Castrol ST90 Monograde SAE90 Mineral Gear Oil

Castrol ST90 is a monograde SAE90 gear oil formulated with high quality mineral oils. Castrol ST90 is fortified with anti-oxidant and anti-wear additives to ensure that the oil is able to withstand the oxidising conditions which will be present in the gearbox during service.

Castrol ST90 is suitable for the lubrication of most types of gear including helical, spur, bevel and worm but most not be used for hypoid gears which require extreme pressure lubricants.

Castrol ST90 is not suitable for applications where MIL-L-2105A/B/C are specified.

 

So, Castrol ST90 is not a hypoid gear oil,  and will be chemically incompatible with them.  So if you switch from an EP90 oil, you will have to flush the system

Paul

Re: gear box oil for yellow metals

Posted by David Cooper at July 12. 2018

Why does it follow that the system needs flushing? They are mineral based. ST90 apparently does not have the EP additives. But why should it matter if some traces remain? It's not like  mixing vegetable with mineral oils, is it?

Re: gear box oil for yellow metals

Posted by Colin Peterson at July 12. 2018

Previously David Cooper wrote:

Why does it follow that the system needs flushing? They are mineral based. ST90 apparently does not have the EP additives. But why should it matter if some traces remain? It's not like  mixing vegetable with mineral oils, is it?

I certainly hope not! Because I've just done this a few weeks ago, drained the EP90 and replaced it with ST90 ...

Re: gear box oil for yellow metals

Posted by anna jeannette Dixon at July 22. 2018

And I will be changing to ST90  have drained the gearbox last week the bike been standing with no gear box oil plug in for the last week , until I sort out an oil tank leak were the mounting studs are,  not got around to it yet  been to busy with other things

As live on my own !!!!  No one to help  me  at all    !!                                                     yours   anna J

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