Mini excavator pressure drops under load: what should be checked before replacing the pump?
Short Answer
A pressure drop under load can be caused by a weak pump, but it can also come from a suction leak, blocked filter, low oil, relief valve bypass, worn control valve, internal cylinder leakage, or hot thin oil. The key is to test pressure and flow while the problem is happening.
What To Check
- Measure pressure cold and hot, then repeat while holding a function under load.
- Inspect suction hoses, tank screen, filters, relief valves, and oil condition.
- If pressure falls only on one function, test that circuit before blaming the main pump.
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Source Record
This question was selected from a current Google-visible result for the keyword mini excavator pressure drops 2000 psi 800 psi under load. The answer is rewritten from JIAJUE parts-matching and sourcing practice, not copied from the source page.
