Red Seal Heavy Equipment Operator (Dozer) Practice Exam

What maintenance action checks hydraulic fluid for contamination?

1. Visual inspection or fluid analysis

2. Changing the oil filter

3. Inspecting the dozer blades for wear

4. Cleaning air filters

The correct answer is: Visual inspection or fluid analysis

The maintenance action that involves checking hydraulic fluid for contamination is visual inspection or fluid analysis. This process is crucial because hydraulic systems operate under high pressure and rely on clean fluid to function properly. Contamination in hydraulic fluid can occur due to various factors, such as dirt, water, or metal particles, which could lead to reduced performance or damage to components. Visual inspection allows operators to assess the clarity and color of the hydraulic fluid, spotting any unusual changes that might indicate contamination. Furthermore, fluid analysis involves sending samples of hydraulic fluid to a laboratory where they undergo thorough testing for various contaminants, including particulate matter and chemical composition. This analysis helps identify potential issues before they lead to severe mechanical failures, ensuring the hydraulic system operates efficiently and prolonging the life of the equipment. Other listed actions, such as changing the oil filter, inspecting the dozer blades for wear, and cleaning air filters, serve different maintenance purposes. While changing the oil filter is essential for maintaining clean oil in an engine or hydraulic system, it does not specifically check for contamination in the hydraulic fluid itself. Inspecting the dozer blades focuses on wear and operational efficiency, and cleaning air filters pertains to maintaining the engine’s air intake, rather than the hydraulic system.