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F00633 Page 21
Troubleshooting
Maintenance
Engine Drive Pumps
CAUSE CORRECTIVE ACTION
I. ENGINE
A. Speed too low Refer to engine manufacturer’s manual.
B. Rotating and/or Refer to engine manufacturer’s manual.
reciprocating parts drag
C. Speed too high Refer to pump and engine power curves. Adjust.
D. Loose or broken parts Refer to engine manufacturer’s manual.
E. Improper adjustment Check fuel and ignition systems. Adjust per engine manufacturer’s manual.
F. Fuel supply Check fuel supply, fuel pump, filters, etc.
II. MECHANICAL
A. Flow through pump completely or Locate and remove obstruction. Refer to Repair Instructions
partially obstructed for disassembly.
B. Wrong direction of rotation Reverse rotation of three phase motor by interchanging any two leads.
See manufacturer’s Instructions for reversing single phase motor.
C. Pump not primed Reprime. Inspect suction system for air leaks.
D. Internal leakage Check impeller for wear of controlled clearances (See Repair Instructions).
E. Loose parts Inspect. Repair.
F. Stuffing box not properly adjusted Adjust gland.
III. SYSTEM
A. Pressure required by system at design Compare pump pressure and flow rate against pump characteristic curve.
flow rate exceeds pressure rating of pump Check for closed or partially closed valve in discharge piping system.
Reduce system pressure requirement. Increase pressure capability of pump.
B. Obstruction in suction piping Locate and remove obstruction.
C. Pressure rating of pump exceeds pressure Compare pump pressure and flow rate against pump characteristic curve.
requirement of system at design flow rate Inspect discharge piping system for breaks, leaks, open by-pass valves, etc.
If necessary, reduce flow rate by partially closing discharge valve.
PROBABLE CAUSE
SYMPTOM GROUP I GROUP II GROUP III
ENGINE MECHANICAL SYSTEM
ABC DE FABCDEFABC
Pump runs, but no water delivered X X X X X
Not enough water delivered X X X X X X X
Not enough pressure X X X X X X X
Excessive vibration X X X X X X X X
Abnormal noise X X X X X X X X X X
Pump stops X X X X
Overheating X X X X X X X X X