WILDEN PUMP & ENGINEERING, LLC 8 WIL-12350-E-02
TROUBLESHOOTING
PUMP WILL NOT RUN OR RUNS SLOWLY.
1. With the use of the flow curve located in the perfor-
mance section of this EOM, verify air pressure and volume
required for your application. If inlet air pressure is too
low, the H1500 Saniflo™ HS pump will not operate.
2. Check air inlet filter for debris (see
SUGGESTED INSTALLATION).
3. Disassemble pump and check for obstructions
in the air passageways or objects which would
obstruct the movement of internal parts.
4. Check for sticking ball check valves. If material being
pumped is not compatible with pump elastomers, swell-
ing may occur. Replace ball check valves and seals
with proper elastomers. Also, as the check balls wear
out, they become smaller and can become stuck in
the seats. In this case, replace the balls and seats.
5. Inspect the inlet pressure relief valve for damage.
Replace if necessary with genuine Wilden® parts.
6. Inspect the center block seals for
damage. Replace if necessary.
7. Check for broken inner piston which will cause
the air valve spool to be unable to shift.
8. Remove plug from pilot spool exhaust.
PUMP RUNS BUT LITTLE OR NO PRODUCT FLOWS.
1. Check for pump cavitation; slow pump speed down to
allow thick material to flow into liquid chambers.
2. Verify that vacuum required to lift liquid is not greater
than the vapor pressure of the material being pumped.
3. Check for sticking ball check valves. If material being
pumped is not compatible with pump elastomers, swell-
ing may occur. Replace ball check valves and seats
with proper elastomers. Also, as the check valve balls
wear out, they become smaller and can become stuck
in the seats. In this case, replace balls and seats.
4. Check tightness of inlet and discharge connections.
PUMP AIR VALVE FREEZES.
1. Check for excessive moisture in compressed air. Either
install a dryer or hot air generator for compressed air.
Alternatively, a coalescing filter may be used to remove
the water from the compressed air in some applications.
AIR BUBBLES IN PUMP DISCHARGE.
1. Check for ruptured diaphragm.
2. Check tightness of outer pistons (refer to Section 7).
3. Check tightness of fasteners and integrity of the
O-rings and seals, especially at intake manifold.
4. Ensure pipe connections are airtight.
PRODUCT COMES OUT AIR EXHAUST.
1. Check for diaphragm rupture.
2. Check tightness of outer pistons to shaft.
3. Check tightness of fasteners that connect
the inner piston to the outer piston.
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