14
WILDEN PUMP & ENGINEERING CO.
SECTION 7F – AIR-CONTROLLED
TROUBLESHOOTING
Pump will not run or runs slowly.
1.
Check air inlet screen and air filter for debris.
2.
Check for sticking air valve, flush air valve in solvent.
3.
Check for worn out air valve. If piston face in air valve is
shiny instead of dull, air valve is probably worn beyond working
tolerances and must be replaced.
4.
Check center block Glyd™ rings. If worn excessively, they
will not seal and air will simply flow through pump and out air
exhaust. Use only Wilden Glyd™ rings as they are of special
construction.
5.
Check for rotating piston in air valve.
6.
Check type of lubricant being used. A higher viscosity oil
than suggested may cause the piston to stick or run erratically.
Wilden suggests the use of an oil with arctic characteristics (ISO
15-5 wt.).
Pump runs but little or no product flows.
1.
Check for pump cavitation; slow pump speed down to
match thickness of material being pumped.
2.
Check for sticking ball check valves. If material being
pumped is not compatible with pump elastomers, swelling may
occur. Replace ball check valves and O-rings with the proper
elastomers.
3.
Check to make sure all suction connections are air tight,
especially clamp bands around intake balls.
Pump air valve freezes.
Check for excessive moisture in compressed air. Either install
dryer or hot air generator for compressed air.
Air bubbles in pump discharge.
1.
Check for ruptured diaphragm.
2.
Check tightness of clamp bands, especially at intake mani-
fold.
Product comes out air exhaust.
1.
Check for diaphragm rupture.
2.
Check tightness of piston plates to shaft.
Pump rattles.
1.
See E9 Troubleshooting Guide.
2.
Create false discharge head or suction lift.
SECTION 7G – ACCU-FLO™
TROUBLESHOOTING
Pump will not run.
1.
Check for pressurized air at the inlet. (Min. 3.1 Bar [45 psig].)
2.
Check air inlet and filter for debris.
3.
Connect a test lamp to the two wires which run to pump
and ensure that the lamp cycles on and off.
4.
Make sure that the air valve manual override (small red
knob on front of valve) is switched to the “0” position.
5.
Check pilot pressure vent at the top of the operator/coil
assembly to ensure that it is not clogged.
6.
Check for a worn out air valve. If air continually blows out
the exhaust in very large quantities, the air valve seals may be
worn beyond their ability to function. In this case, the valve must
be replaced.
NOTE: Before the valve is scrapped, it is possible that it may be
saved by completely disassembling the valve, cleaning all
components and relubricating the valve.
Pump runs but little or no fluid comes out.
1.
Check that the discharge isolation valve is not closed.
2.
Check that the electronic signal is slow enough that the
pump is able to complete each physical stroke before it is
signaled to change direction. The time required to complete the
stroke is determined by a variety of factors which include fluid
viscosity and head pressure. The shaft can be viewed if the
muffler is removed to verify that the pump is stroking.
3.
Check for pump cavitation; slow pump speed down to
match the thickness of the material being pumped.
4.
Check for sticking ball check valves. If the material being
pumped is not compatible with the pump elastomers, swelling
may occur. Replace ball check valves and O-ring with the proper
elastomers.
5.
Check to make sure that all suction connections are air
tight, and that the clamp bands are properly tightened.
Pump air passages blocked with ice.
Check for excessive moisture in compressed air line. As the air
expands out the exhaust during the operation of the pump,
water vapor entrapped in the compressed air can freeze and
block the air passageways in the pump. If this occurs, it may
be necessary to install a coalescing filter, an air dryer, or a hot
air generator for the compressed air.
Air bubbles in pump discharge.
1.
Check for ruptured diaphragm.
2.
Check tightness of clamp bands, and the integrity of the
O-rings, especially at intake manifold.
Product comes out air exhaust.
1.
Check for diaphragm rupture.
2.
Check tightness of piston plates to shaft.
Pump rattles.
1.
See E9 Troubleshooting Guide.
2.
Create false discharge head or suction lift.
Solenoid buzzes or solenoid burnout.
1.
Incorrect voltage, faulty or dirty solenoid.
Solenoid valve fails to shift electrically but shifts with
manual override.
1.
Incorrect voltage, defective coil or wiring.
Solenoid valve fails to shift electrically or with manual over-
ride.
1.
Inadequate air supply, contamination, inadequate or
improper lubrication, mechanical binding in the valve.
Valve shifts but fails to return.
1.
Broken spring, mechanical binding.
Excessive leaking from air valve vent.
1.
Worn seals in air valve.