MSD
TM
Series
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Basic Troubleshooting Chart
Symptom
Possible Cause
Action
Low flow or low
pressure
Restriction in inlet or
discharge pipes
- Check pump inlet pressure
- Check position of all control valves
- Check throttle valve is fully open
Incorrect pump
speed or direction
- Check VFD for proper speed setting (if equipped).
- Check power supply frequency (50 or 60 Hz)
- Check rotational direction of motor
Gauges not operat-
ing properly
- Inspect gauges for proper operation.
Air Leaks (vacuum
on pump inlet)
- Inspect inlet piping joints for leaks
- Inspect pump mechanical shaft seal for leaks
Pump cavitation
- Check inlet pressure during operation
- Check for excessive flow rate
Air in casing
- Purge air from all piping
Internal damage
- Inspect balance disc for damage
- Inspect HPSC vent line for restrictions (if
equipped)
Design parameters
- Pump not designed for operating conditions
Pump vibration or
noise
Operating conditions - Pump cavitation
- Excessive flow rate
- Insufficient flow rate
Pump misalignment - Inspect alignment (Refer to
Final Pump Alignment
)
Balance disc
- Inspect balance disc for damage
- Inspect HPSC vent line for restrictions (if
equipped)
Pump Leaks
Pipe Joints
- Inspect pipe joints for insufficient sealing
Pump Shell
- Inspect pump stage joints for damaged O-rings
Pump Shaft
- Inspect mechanical seal for leakage
- Inspect pump shaft for misalignment
Motor runs hot, is
noisy or shuts off
Excessive Motor
Load
- Check voltage supply for consistency
- Check ambient air temperature
- Check wiring and fuses for phase loss
- Check flow rate and VFD settings (if
Equipped).
- Check wiring length between motor and VFD
(if equipped).
- Check motor bearings
NOTES:
Contact motor manufacturer for proper
repair procedures.