Manual for a Sanborn 64CU-22?
This looks like the model number but the tag is damaged so one or two of the characters could be wrong.
The rest of the tag says the motor is 3 hp at 3450 rpm
The pump is a Model 64 serial number 1979.
(That seems like too large a motor for the size of the pump, unless maybe they mean a bogus "peak" ratings.)
In any case, is there a source for a manual for this item?