Originalbetriebsanleitung
FLEXI
MIX
2
75
FMII_BAoDB_en_1401 • rs
Troubleshooting
8 Troubleshooting
8.1 Mechanical faults
Fault
Possible cause/s
Remedy
Metering pump does not
start although the spray
gun or the return flow
valve on the mixing unit is
opened.
1. Compressed air shut-
off valve at the meter-
ing pump closed.
2. High pressure filter
clogged.
3. Air motor defective.
Open the compressed air shut-off valve.
Clean or renew the filter element.
Repair air motor – request
WIWA
after sales service
if necessary.
Metering pump is running
but no or too little material
is being delivered.
1. Intake or suction hose
clogged.
2. Ball of bottom valve
does not lift off in the
upward stroke (stuck).
3. Bottom valve does not
close in the down-
wards stroke.
4. Viscosity of the materi-
al to high.
5. Air inlet pressure too
low.
Clean intake and suction hose.
Tap the bottom valve lightly from the side (hammer).
Unscrew the suction system and loosen the ball in the
bottom valve from underneath if this does not help.
Unscrew the bottom valve, thoroughly clean the ball
and the seat (see repair instructions for the metering
pump).
Heat up the Material to reduce the viscosity.
Increase air inlet pressure on compressed air regula-
tor. If this does not help, check air line for correct size
and compressor output.
The metering pump is
running but the required
spraying pressure is not
being reached.
1. Spray nozzle clogged.
2. Spray nozzle too big.
3. Spray nozzle worn.
4. Air inlet pressure too
low.
Clean spray nozzle.
Use smaller spray nozzle.
Replace spray nozzle.
Increase air inlet pressure on compressed air regula-
tor. If this does not help, check air line for correct size
and compressor output.
The metering pump or
flushing pump does not
stop when the spray gun
is closed.
1. Packing or valve worn.
Replace worn parts.
The metering pump runs
irregularly (can be noticed
by differences in up and
down stroke speeds) and
does not reach the re-
quired spraying pressure.
1. Viscosity of the materi-
al to high.
2. Suction system leak-
ing.
3. Bottom valve leaking
(metering pump only
stops in upward stroke
when the spray gun is
closed).
4. Piston valve leaking
(metering pump only
stops in downward
stroke when the spray
gun is closed).
5. Bottom or top packing
worn.
Heat up the Material to reduce the viscosity.
Check seals and unions in the suction system and
replace as necessary.
Unscrew bottom valve, clean and check ball and valve
seat, replace ball or valve seat as necessary (see
metering pump repair instructions).
Clean and check ball and valve seat in the dual
piston, replace ball or valve seat as necessary (see
metering pump repair instructions).
Replace the packing (see metering pump repair
instructions).
Summary of Contents for FLEXIMIX 2 HERKULES Series
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