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The pump has no suction power
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One or more valves are not correctly sealed or leaking.
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Check the valve seat and clean it.
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The pressure gauge shows sudden changes.
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The pump sucks in air or is not properly de-aerated.
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Check suction lines. Run the pump with closed master valve (by-pass) in order to prime the pump.
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The pump outlet is irregular
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The accumulator (air chamber) is empty.
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Fill the accumulator with sufficient air pressure
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The pump gives enough water but not enough pressure.
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The seals of the pressure regulator are worn.
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Replace seals and possibly also the valve seats.
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The pump yield is reduced and the pump is noisier.
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The oil level is too low.
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Top up the oil.
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There is an oil leak.
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One or more diaphragms are damaged.
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Drain off the oil and dismantle the cylinder head to replace the damaged diaphragms. Replace the oil with 20W40.
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