A professional who repairs pumps and pump power units, such as centrifugal and plunger-type pumps, and diesel-engine, gasoline-engine, and electric-motor power units, using hoists and handtools. Responsibilities include:

• Diagnoses trouble in pumps.
• Dismantles pumps and repairs or replaces defective parts, using handtools.
• Reseats and grinds valves.
• Tests performances of repaired pumps.
• May wire motor to switchboard and install fuse box.
• May be designated according to type of pump repaired as water-pump servicer.