Troubleshooting - ProMinent DULCOflex DFBa Series Operating Instructions Manual

Maintenance, repair, malfunctions, disposal and spare parts
Exchanging the pump hoses - installa‐
tion

7.3 Troubleshooting

Problem
Increased pump temperature
Reduced flow or pressure
34
6. Remove the pressure flange from the pump housing
7. Remove the pump hose to be exchanged
8. Dismantle the hydraulic connections from both pump hose
ends
1. Clean the interior surfaces of the pump housing
2. Lubricate the internal surfaces of the pump housing at the
contact surfaces to the pump hose
3. Check the rollers. Ensure that the roller surfaces are not
damaged
4. Attach the hydraulic connections at both hose ends with the
help of the pressure flange
5. Lay the pump hose into the pump housing
6. Lubricate the pump hose and the rollers
7. Fasten the pressure flange to the pump casing
8. Turn the rotor with the help of the motor so that the remaining
roller presses against the pump hose
9. Re-attach the second roller with spacer plates back onto the
rotor
10. Attach the front cover to the pump housing
11. Mount the pump hoses from both discharge and suction
sides
12. Open all of the valves
Possible cause
Pump hose 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 pipe
Insufficient product quantity in
storage container
Insufficient diameter on the suc‐
tion side
Suction line too long
Solution
Lubricate pump hose
Reduce product temperature
Check suction line for blockages
Reduce pump speed
Open valves
Check roller fastening
Exchange pump hose
Fill storage container or exchange
pump
Increase the diameter on the suc‐
tions side, as far as possible
Shorten the suction line, as far as
possible