Removal and Installation of Fuel Cooler

Problem Possible cause Countermeasure and solution

When an external load acts on the motor and pumping operation is done, cavitation occurs and abnormal noise is created. There is foreign matter caught in the plunger, plunger movement is poor, and counter balance functions are not fulfilled.

There is damage to the plunger spring and counter balance functions are not fulfilled.

The plunger spring is not fit correctly in place and counter balance functions are not fulfilled. Perform disassembly and remove foreign matter. Investigate the degree of damage according to Maintenance Procedures and reassemble the plunger if it is useable. If reusing is impossible, perform replacement with the base plate kit. Perform disassembly and replace the spring and perform reassembly after removing foreign matter. Fit the spring correctly in place.

There is damage to the check valve spring and counter balance functions are not fulfilled. Perform disassembly and replace the spring after removing foreign matter.

The check valve spring is not fit correctly in place and counter balance functions are not fulfilled. Fit the spring correctly in place.

Foreign matter is clogging the orifice in the pilot oil path, and counter balance functions are not fulfilled. Perform disassembly and reassemble after removing foreign matter.