Allweiler SPF series - Page 26

Troubleshooting
Malfunction number
1234
5
6
7
8
Cause
Remedy
XX
–
XX
–––
Excess play between:
•Spindles
• Spindles and housing
Repair or replace any wo rn parts.
XX
–
X
––
X
–
Shaft seal leaking
Replace the shaft seal.
–
X
–
X
––––
Motor speed too low
Compare the required motor speed with
the specifications on the pump type
plate. Replace the motor i f necessary.
Increase the motor speed if speed
control is available.
–
X
–
X
––––
Supply/suction pipe not fully opened
Open the fitting.
–
X
–
XX
–––
Supply/suction pipe cross-section too
narrow
Enlarge the supply/suction pipe
cross-section.
Remove a ny encrustations from the
suction pipe.
Open the fitting completely.
–
X
–
XX
–––
Suction height excessive: NPSH
pump
larger
than NPSH
system
Increase the suction pressure.
Consult the manufacturer.
–
X
–
XX
–––
Pumped liquid temperature too high: Pump
is cavitating
Increase the suction pressure.
Lower the temperature .
Consult the manufacturer.
–
X
–
XX
–––
Hydraulic parts of the pump dirty, clotted or
encrusted
Dismount the pump.
Clean the parts.
–
X
–
X
–––
X
Viscosity or specific weight of the pumped
liquid outside th e r ange specified for the
pump
Consult the manufacturer.
–– ––
X
–––
Pressure-side fitting not opened wide
enough
Open the pressure-side fitting.
–
X
–
XXX
––
Pump parts worn
Replace the worn pump parts.
––
X
–
X
––
X Motor speed too h igh
Compare the required motor speed with
the specifications on the pump type
plate. Replace the motor i f necessary.
Reduce the motor speed if speed
control
is available.
–– ––
XX
–
X
Antifriction bearing defective
Replace the antifriction bearing.
–– –– –
X
–
X
Defective antifriction bearing in motor
Replace the antifriction bearing.
–– –– ––
X
–
Tie bolts
not tightened properly
Tighten the tie bolts (→ 9.2.3 Tightening
torques, Page 31).
–– –– ––
X
–
Seal shaft seal
Replace the mechanical seal.
–– –– ––
X
–
Housing seal defective
Replace the housing s eal.
26 SPF series BA-2014.01 626.0005 GB – 550 041