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®
Co. All rights reserved.
Symptom
Possible Cause(s)
Corrective Action
Little or no discharge
1. Pump not primed
1. Prime unit
2. Total head too high
2. Shorten suction lift and/or discharge head
3. Suction head higher than pump
3. Lower pump inlet
designed for
4. Impeller
clogged
4. Clean
5. Incorrect rotation
5. Refer to wiring information
6. Leak in suction line
6. Repair or replace
7. Inadequate foot valve
7. Make needed adjustments
8. Impeller
damaged
8. Replace
9. Foot valve or suction line
9. Submerge lower in water
not submerged deep enough in water
10. Insufficient inlet pressure or suction head
10. Increase inlet pressure by
source
adding more fluid to fluid
11. Wrong size piping
11. Make needed adjustments
12. Casing gasket leaking
12. Replace gasket
13. Suction or discharge line valves closed
13. Open
Loss of suction
1. Air leak in suction line
1. Repair
2. Suction head too high
2. Lower pump inlet
3. Insufficient inlet pressure or
3. Increase inlet pressure by
suction head
adding more fluid to fluid source
4. Clogged foot valve or strainer
4. Clean or replace
Pump vibrates and/or makes 1. Mounting plate or foundation not rigid enough
1. Reinforce
excessive noise
2. Foreign material in pump
2. Clean
3. Damaged
impeller
3. Replace
4. Cavitation present
4. Check suction line for proper size and be
certain valve is open. Remove excessive
loops in suction line
5. Worn motor bearings
5. Replace
6. Bent impeller shaft
6. Replace
Pump will not start or run
1. Improperly wired
1. Refer to wiring diagram
2. Blown fuse or open circuit breaker
2. Replace fuse or close circuit breaker
3. Loose or broken wiring
3. Tighten connections and replace broken wiring
4. Impeller
clogged
4. Clean
5. Motor shorted out
5. Replace
Pumps leaks at shaft
1. Worn mechanical seal
1. Replace
2. Bent impeller shaft
2. Replace
Place a clean cardboard washer over the polished
seal face and carefully press into place using a piece
of pipe or tubing (see Figure 8). Discard cardboard
washer.
4. Apply liquid soap (one drop only) to the inside
diameter of the rubber drive ring. Slip rubber drive
ring (carbon face down) and the spring over the shaft.
5. Reassemble the pump by following the reverse order
of the disassembly instructions.
MOTOR REPLACEMENT
1. Nema J motors can be replaced in the field with any
standard Nema J jet pump motor by referring to the
following instructions and the attached parts list.
2. Follow steps as outlined under Rotary Seal
Replacement to remove the pump body, diffuser, impeller
and rotary seal.
3. Remove bolts that connect the motor to the mounting
ring and pull motor away.
4. Replace motor with standard Nema J jet pump motor
by positioning motor against the mounting frame and
assembling with four (4) 3/8" x 3/4" cap screws. The
mounting base is connected at the bottom of the
mounting frame with two (2) 3/8" x 1/2" cap screws.
5. Follow steps of Rotary Seal Assembly to reassemble the
remainder of the pump.
BECAUSE DAMAGE TO THE SHAFT SEAL IS MOST
LIKELY TO OCCUR IN DISASSEMBLY, A NEW SEAL IS
REQUIRED.
TROUBLESHOOTING CHART
