Troubleshooting - ProMinent DULCOflex DFDa Operating Instructions Manual

6.3 Troubleshooting

Problem
Increased pump temperature
Reduced flow or pressure
Vibrations on pumps and pipe‐
work
Maintenance, repair, troubleshooting, disposal and spare parts
9. Now carefully screw the bearing flange with the four screws
onto the pump housing.
In doing so, ensure that the flange sleeve is not damaged. If
necessary, knock the flange sleeve in with a plastic-faced
hammer
10. Now fasten the bearing flange and clamping ring on the suc‐
tion side in the same way as the description for the discharge
side
11. Screw the drain plug and vent screw back into the pump
housing
12. Fill the pump with lubricant by means of the filler inlet up to
the filling level mark.
13. Close the filler inlet
14. Mount the pipes on both the discharge and suction sides
15. Open all of the valves
Possible cause
Pump housing has no lubricant
Increased product temperature
Insufficient or poor suction condi‐
tions
Pump speed too high
Valves on discharge and or suc‐
tion side completely or partially
closed
Pump hose insufficiently com‐
pressed
Pump hose rupture (the product
leaks out into the housing)
Partial blockage of the suction line Clean pipes
Insufficient product quantity in
storage tank
Insufficient diameter on the suc‐
tion side
Suction line too long
High viscosity of medium
Air entry through the suction con‐
nectors
The pipes are not correctly fas‐
tened
Pump speed too high
Solution
Ä Chapter
Fill lubricant, see
4.3.6.2 'Filling level for pump
housing' on page 37
Reduce product temperature
Check suction line for blockages
Reduce pump speed
Open valves
Check shoe fixing
Replace pump hose
Fill storage tank or switch off
pump
Increase the diameter on the suc‐
tion side, as far as possible
Shorten the suction line, as far as
possible
Reduce viscosity, as far as pos‐
sible
Check connectors and accesso‐
ries for air tightness
Fasten pipes correctly (e.g. wall
brackets)
Reduce pump speed
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