Trebor 50U Maxim - Manual (Page 31)

MAXIM 50E/U PUMP OPERATION / MAINTENANCE MANUAL PAGE 31
5 TROUBLESHOOTING
Pump Will Not Start, Fails to Operate
Cause: Solution:
 Insufficient air pressure.  Must be minimum 15 psi at pump air hook-up.
 Air lines not attached properly.  Check external controller.
 Insufficient air volume (low supply
pressure during running).  See Performance Charts (3.1) for requirements. Check
for both regulator and control valve capabilities.
 Fluid discharge line blocked.
Downstream valve closed, filter plugged
or other obstruction.  Remove obstruction.
 Probe failure (E Model only).  Check fiber optic probes for correct operation.
Check external controller.
Check for excessive bends in fiber optic cable.
Clean or trim fiber optic cable at the sensor.
Bubbles in Fluid Discharge
Cause: Solution:
 Leaking fluid inlet fitting.  Replace adapter seal.
 Leaking main seal.  Tighten union nut to 75 ft-lbs. or replace diaphragms, and
check head and body seal grooves for nicks or scratches.
 Pump inlet line pressure reached
saturation point (due to high suction
requirement).  Increase diameter of suction supply line (reduces
restriction).
Reduce output flow.
 Ruptured (perforated) diaphragm.  Replace diaphragms.
 Check bore caps leaking.  Tighten check bore caps or replace seals.
Fluid Leaks
Cause: Solution:
 Union nut torque not enough to create
seal.  Tighten union nuts to 75 ft-lbs.
 Leaking main seal.  Replace diaphragms.
Check head and body seal grooves for nicks or scratches.
 Check bore cap.  Tighten, or remove and replace seal.
 Ruptured diaphragm(s) can result in
fluid leaks through air exhaust port.  Replace diaphragms, and any parts that may have been
damaged by fluid exposure.
Erratic Cycling
Cause: Solution:
 Air line or fittings leak in external
controller.  Replace tubing or tighten fittings.
Replace controller.
 Suction line restricted (cavitation).  Reduce fluid restriction.
 Quick exhaust seal not sealing.  Check for particles between seal and port. Replace seal.
 Check ball(s) not seating.  Check O-rings for damage; replace if necessary.
Make sure check balls move freely in sleeves.
 Transfer tube leaking.  Tighten transfer tubes and quick grip nuts as described in
Section .