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Check the hose or pipes are not blocked. There should be a pressure relief valve in the circuit, maybe thats the culprit, as the pump can be heard going over the relief if you turn the wheel to hard lock - this would tell you if the relief is working or not. I think these systems run at around the 1500-1800psi - big pressure for a tiny hose clamp. Check the hose is correctly rated for the duty and if its the pressure side of the pump, consult the manual to see if the connections should be crimped or similar.
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