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
6.3 Troubleshooting
Problem
Possible cause
Solution
Increased pump temperature
Pump housing has no lubricant
Fill lubricant, see
4.3.6.2 ‘Filling level for pump
Increased product temperature
Reduce product temperature
Insufficient or poor suction condi‐
tions
Check suction line for blockages
Pump speed too high
Reduce pump speed
Reduced flow or pressure
Valves on discharge and or suc‐
tion side completely or partially
closed
Open valves
Pump hose insufficiently com‐
pressed
Check shoe fixing
Pump hose rupture (the product
leaks out into the housing)
Replace pump hose
Partial blockage of the suction line Clean pipes
Insufficient product quantity in
storage tank
Fill storage tank or switch off
pump
Insufficient diameter on the suc‐
tion side
Increase the diameter on the suc‐
tion side, as far as possible
Suction line too long
Shorten the suction line, as far as
possible
High viscosity of medium
Reduce viscosity, as far as pos‐
sible
Air entry through the suction con‐
nectors
Check connectors and accesso‐
ries for air tightness
Vibrations on pumps and pipe‐
work
The pipes are not correctly fas‐
tened
Fasten pipes correctly (e.g. wall
brackets)
Pump speed too high
Reduce pump speed
Maintenance, repair, troubleshooting, disposal and spare parts
41
