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Maintenance of hot oil pump: 1. Note that the temperature of the pump bearing should not exceed the outside temperature of 35 ℃, but the maximum should not be greater than 75 ℃. 2. The cup should be filled with calcium-based butter to ensure that the bearing can be lubricated normally. 3. Hot oil pump in the first month of work, or after 100 hours of operation, should replace the motor support oil cup butter. After every 2000 hours of work to be replaced once. 4. Regularly check the flexible coupling, pay attention to motor bearing temperature rise. 5. During operation, if any noise or abnormal sound is found, stop inspection immediately. 6. The pump should be checked for a period of 2000 hours of operation. The clearance between the impeller and pump body (or pump cover) should not be too large. The maximum clearance should not exceed 1.5 mm, such as exceeding the replaceable impeller or cover.