Tuthill NEXTEC FILL-RITE NX25-DDC Series, Installation And Operation Manual, Page: 14 / 16

| NX25-DDC SERIES DC FUEL TRANSFER PUMP
This Troubleshooting guide provides basic diagnostic assistance. If you have further questions, contact us at 1-800-634-2695 (M-F 8 AM–6
PM ET), or on the web at “www.fillrite.com”.
Troubleshooting
DANGER! Disconnect all power prior to performing any service or maintenance. Failure to disconnect the power may cause electrical shock, or unexpected starting of
the motor, resulting in injury or death.
WARNING!
DO NOT open or attempt to repair the motor on your NX25-DDC series pump. Opening the motor case can compromise the integrity of the Explosion Proof
construction and will void any existing warranty and certification (UL listing).
Please refer to the warranty policy located on page 2.
Symptom Cause Solution
Pump won’t prime 1. Suction line problem Check suction line for leaks or restrictions; it may be too small in
diameter, too long, or not air tight
2. Vanes sticking Check vanes for nicks, damage, obstructions, or excess wear;
replace as necessary
3. Excessive rotor, vane, rotor cover, or
housing wear Inspect rotor, vanes, rotor cover, and housing for excess wear;
replace as necessary
4. Inlet / Outlet blocked Check pump, hose, nozzle, and filter / strainer for blockage
5. Excessive vertical or horizontal inlet
plumbing Reduce vertical or horizontal distance from pump to liquid
6. Bypass valve stuck Open valve, remove debris
Low capacity 1. Excessive dirt in screen Remove and clean screen
2. Suction line problem Check suction line for leaks or restrictions; it may be too small in
diameter, too long, not air tight, or too low vertically
3. Excessive rotor, vane, rotor cover, or
housing wear Inspect rotor, vanes, rotor cover, and housing for excess wear;
replace as necessary
4. Hose or nozzle damage Replace hose or nozzle
5. Low fluid level Refill tank
6. Clogged outlet filter Replace filter
Pump runs slowly 1. Pump in bypass Normal operation; pump naturally reduces speed in bypass mode
2. Vanes sticking Check vanes for nicks, damage, obstructions, or excess wear;
replace as necessary
3. Motor problem*
Refer to warranty policy
4. Excessive outlet restrictions Reduce outlet restrictions (e.g. use shorter hose, remove swivel)
Motor stalls / breaker
trips 1. Short in wiring Inspect electrical wiring for shorts and replace as necessary
2. Excess rotor or vane wear Check vanes for nicks, damage, obstructions, or excess wear;
replace as necessary
3. Pump rotor lock-up* Clean and inspect rotor and vanes; replace as necessary
4. Debris in pump cavity Clean debris from pump cavity
Bold text
indicates repairs that are not serviceable by the owner;
please refer to our warranty policy on page 2 for
further instructions.
*This condition will shut the motor off.