Trebor 610NM Magnum - Manual (Page 20)

PAGE 20 MAGNUM 610NM PUMP OPERATION / MAINTENANCE MANUAL
5 TROUBLESHOOTING
Pump Will Not Start, Fails to Operate
Cause: Solution:
 Insufficient air pressure.  Must be 10-15 psi greater than fluid discharge line
pressure.
 Insufficient air volume.  See Performance Charts (Section 3.2) for
requirements.
 Dirty or damaged shuttle valve.  Clean shuttle spool/detent and sleeve until free
movement is assured; or replace (see 4.8.a).
 New diaphragm installed; not stretched
enough to allow contact with pilot valves.  Increase air pressure up to 60 psig until pump starts.
Decrease for proper flow if necessary.
 Both diaphragms expanded into contact
with pilot valves due to excess fluid supply
line pressure.  Adjust check muffler assembly (see 0).
 Fluid discharge line blocked. Downstream
valve closed, filter plugged or other
obstruction (dead head).  Remove obstruction. Refer to Section 0 for further
information on “Dead Head” condition.
Bubbles in Fluid Discharge
Cause: Solution:
 Leaking fluid inlet fitting.  Tighten, or remove and wrap with TFE thread tape
prior to tightening.
 Leaking main seal.  Tighten tie bolt nuts to 42 in-lbs. Replace diaphragms
if damaged.
 Ruptured (perforated) diaphragm.  Replace Diaphragms.
Fluid Leaks
Cause: Solution:
 Tie bolt torque not enough to effect seal.  Tighten all nuts to 42 in-lbs.
 Damaged main seal.  Replace.
Check for irregularities in diaphragm groove on pump
body.
 Check bore cap.  Tighten, or remove and replace seal.
 Ruptured diaphragm(s) can result in fluid
leaks through air exhaust port and shuttle
valve.  Replace diaphragms, and any parts that may have
been damaged by fluid exposure.
Erratic Cycling
Cause: Solution:
 Leaking shuttle cap.  Rewrap with PTFE thread tape (see 4.8.a).
 Fluid supply line restricted (cavitation).  Reduce fluid restriction.
Reduce distance, height of suction head.
Increase diameter of suction supply line (reduces
restriction).
 Fluid supply line pressure.  Adjust check muffler assembly (see 0).
 Pilot valve not seating.  Check pilot valve function and seal.
Replace O-ring.
 Check ball(s) not seating.  Replace check balls and O-rings.