Dig It or Miss It? The Ultimate Excavator & Heavy Engineering Masterclass

What is the primary fail-safe function of the Main Relief Valve in the hydraulic manifold?

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Incorrect!

If work attachment stops suddenly due to bedrock striking and pump delivery continues, hydraulic peak pressure spikes. The relief valve instantly vents oil back to the oil reservoir, stopping lines or valve seals from bursting under stress.

What is the primary fail-safe function of the Main Relief Valve in the hydraulic manifold?

Keep fuel vapor pressure low in the fuel tank

Release hydraulic oil when pressure limit exceeded

Control track tension based on ground terrain

Prevent engine coolant from boiling over

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