The mixing of hydraulic fluids can cause what?

• A. A Gummy Deposit
• B. Corrosion
• C. Foaming
• D. Freezing

Answer: (A)

Mixing hydraulic fluids introduces incompatible additive packages that can react or precipitate, forming gummy, varnish-like residues. These sticky deposits cling to passages, screens, and valves, narrowing flow paths and causing sticking or sluggish operation. That’s why gummy deposits are the most likely and insidious result of mixing fluids. Other issues like foaming, corrosion, or freezing can occur in related situations, but the direct consequence of mixing incompatible fluids is the formation of these gummy deposits.