Trebor Mega 960D - 5 Troubleshooting

MEGA 960D PUMP OPERATION / MAINTENANCE MANUAL PAGE 25
5 TROUBLESHOOTING
Pump Will Not Start, Fails to Operate
Cause:
Solution:
Insufficient air pressure (must be
enough to energize the pilot and
shuttle valves).
Pilot valves ‘buzzing’.
There must be minimum 20 psig at pump air hook-up.
Insufficient air volume.
See Performance Charts (3.1) for requirements.
Reference regulator and control valve capacity
specifications.
Dirty or damaged shuttle valve.
Clean shuttle spool assembly and sleeve until free
movement is assured (see 4.7.a,4.7.b), or replace.
Damaged, sticky pilot valve (not
following diaphragm properly).
Pilot valve piston must slide freely, full travel, in pilot
valve sleeve.
Remove pilot pistons and check for debris or chemical
attack.
Replace damaged valve assembly.
Fluid discharge line blocked.
Downstream valve closed, filter
plugged or other obstruction.
Remove obstruction.
Bubbles in Fluid Discharge
Cause:
Solution:
Leaking fluid inlet fitting.
Tighten, or remove and wrap with TFE thread tape prior
to tightening. Replace adapter O-ring.
Leaking main seal.
Tighten tie bolt nuts to 60 in-lbs. Replace main seals if
damaged.
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.
Fluid Leaks
Cause:
Solution:
Tie bolt torque not enough to effect
seal.
Tighten all nuts to 60 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.
Replace diaphragms, and any parts that may have been
damaged by fluid exposure.