20
11 Troubleshooting table
WARNING
In the event of a malfunction or abnormal operation, shut off the pump immediately to
prevent a dangerous situation and/or damage to the unit.
Problem
Possible cause
Solution
No flow while the pump and drive
are running.
Wellpoint system is not properly
installed or leaking.
Check the wellpoint system and
eliminate the leaks.
The the leather piston cups are
dry and have shrunk.
Fill the pump housing with
water..
The leather piston cups are
totally worn out.
Replace the leather piston cups.
Too much iron or lime deposit in
the pump housing / in the stone
catcher.
Clean the pump and stone
catcher.
Ice build-up around in the pump
housing / stone catcher
(normally the engine will not start
running).
Thaw the pump.
Vacuum regulator valve on the
stone catcher is not set or
malfunctioning.
Adjust the valve to max. 8.5
metres on the vacuum gauge. Or
replace the valve.
Problem
Possible cause
Solution
Insufficient flow while the pump
and drive are running.
Wellpoint system is not properly
installed or leaking.
Check the wellpoint system and
eliminate the leaks.
The leather piston cups are
worn.
Replace the leather piston cups.
Too much air leaking along the
gland packing (stuffing box).
Tighten the gland follower so that
one (1) drop of water leaks every
five (5) seconds.
Too much iron or lime deposit in
the pump housing / in the stone
catcher.
Clean the pump and stone
catcher properly.
Vacuum regulator valve on the
stone catcher is not set.
Adjust valve to max. 8.5 metres
on the vacuum gauge.
Pump speed is too low.
Increase diesel engine RPM or
motor speed (VFD).
Incorrect direction of rotation
(only electric driven pumps).
Reverse direction of rotation
(only electric driven pumps).
