PFT RITMO L plus - 52 Pumping stopped; blockage; Malfunctions and Causes; 52.1 Remedying hose blockages; Signs of blockages

Mixing pump RITMO L plus FC-230V Overview – Operation
Pumping stopped / blockage
50 2020-11-09
Malfunction Possible cause Solution Performed by
“Thick-thin”
mortar flow
Not enough water Increase water supply by 10%
for approx. ½ minute and then
reduce it slowly
Operator
Water safety switch misadjusted
or defective
Set or replace water pressure
safety switch
Service technician
Mixing shaft defective;
no original PFT mixing shaft
Replace mixing shaft with an
original PFT mixing shaft
Operator
Pressure reducer incorrectly set
or defective
Set the pressure reducer correctly,
or replace it
Service technician
Rotor worn or faulty Replace the rotor Service technician
Stator worn Replace stator Service technician
Inner wall of mortar hose defective Replace mortar hose Operator
Rotor too deep in pressure flange Replace pressure flange Service technician
Part not original PFT spare part Use an original PFT spare part Service technician
Water level
rises in
mixing tube
during
operation.
Backpressure in mortar hose
higher than pump pressure
Readjust or replace stator Service technician
Rotor or stator worn out Replace rotor or stator Service technician
Hose blockage due to mortar
being too thick (high pressure
due to low water factor)
Remedy hose blockage,
increase water factor
Service technician
52 Pumping stopped / blockage
When the conveyed material remains stuck in the conveying hoses and cannot be pumped out through
the hose end, this is a blockage, which can occur in conveying hoses for a number of reasons.
52.1 Remedying hose blockages / Signs of blockages
Performed by operator:
 Blockages can occur in the pressure flange or in the mortar hoses.
Indications of this are:
 Steep rise in feed pressure,
 Seizing of pump
 Sluggishness or seizing of pump motor
 Widening and twisting of mortar hose
 No material emerges from hose end