There are several reasons why the pump may be exceeding full load amperage:
Low voltage supply     Three phase current is imbalanced     Motor is grounded or shorted     Wiring or connections are faulty     Viscosity or specific gravity too great
The pump might also be undersized for the application and operating beyond it's rated flow. In this case try throttling the discharge valve on the system back toward the closed position until pump  motor amps are within limits.