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13. Troubleshooting
Problem
Cause
Recommended action
Dosing pump not delivering or
output too low.
Valves are leaking or blocked.
Clean check valves and bleed dos-
ing head. See also chapter 9.
Valves are incorrectly installed.
Assemble valves again
Ensure that the valve balls are above
the valve seats.
Suction valve or suction pipe
leaking or blocked.
Clean and seal the suction pipe.
Suction level too high.
- Set the dosing pump to “intake”.
- Install the pulsation dampener on
the suction.
- Install priming aid
Viscosity too high.
- Install spring-loaded valves
- Enlarge the pipe cross section
- Use a special dosing head.
>> Contact Lutz-Jesco
No existing stroke motion.
Dosing pump set on 0 strokes.
Correctly adjust the pump stroke
length.
Loaded spring broken
Replace springs.
Interrupted supply flow/tension
Turn on line voltage.
Numerous ruptures
in the diaphragm
missing support plate.
See chapter 11 “maintenance”
Install a new diaphragm with sup-
porting plate. When changing the
diaphragm check if the diaphragm
rod has been attacked by the me-
dium sprayed through.
The diaphragm is not properly
screwed to the to the diaphragm
rod.
Screw the new diaphragm up to
the stop limit. The supporting plate
must then be affixed inbetween the
diaphragm and diaphragm rod..
Backpressure too high
(Measured at the pressure con-
nection of the dosing pump).
Check the system. Clean out
blocked injection nozzle. Stop pres-
sure surges due to too long piping
from the installation of the pulsation
dampener.
Check function of safety valves.
Media sedimentin dosing head
Flush out dosing head.
The dosing pump delivers too
much
(Dosing pump levers through)
Suction side pressure too high.
Install pressure relief valve or a suc-
tion pressure regulator.
Stroke stop shifted.
Reset the strokes.
