What different kinds of Hydraulic Contamination is there?

I've looked and looked and cant find a thing.

Answers:
1. Contamination of the hydraulic fluid with water, very detrimental to the equipment.
2. Dirt due to improper filtration.
3. Worn metal particles due improper magnetic traps in the sump of hydraullic oil.
4. Other liquids used on equipment due to leaky seals
The above can be found out by change of colour of hydraullic fluid, while changing filters, attending to seals and of course conducting mandatory checks of fluid over recommended intervals. corrective and preventive actions will have to be taken based on checks.
VR
Hydraulic fluid contamination is defined as any foreign material or substance whose presence in the fluid is capable of adversely affecting the system performance or reliability. Such as chemical change in the nature of the fluid ,acidity for example; or foreign additives to the fluid which will change the viscosity of the fluid or the clarity.

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