The answer is as follows
1. First, remove the water supply pipe connecting to the circulating water and the vacuum pump inlet pipe and outlet pipe.
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2. Then remove the fastening bolts above the vacuum pump body and remove the pump cover, and then remove the impeller and key with special tools.
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3 Vacuum pump except for the water ring vacuum pump is the use of mechanical seal is the use of packing seal, so need to remove the packing gland, and then the inside of the packing and packing ring out.
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4 Loosen the connection bolt between the vacuum pump and the support, and then the whole pump body can be removed.