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12.1 Lubrication
Ball bearings are lubricated for life and don't require any grease
adding.
12.2 Inspection of the vanes
It is recommended that the condition of the vanes should be
checked every 700 hours of operation.
In the case of excessive wear, vanes and pushrods should be
replaced by a complete new set.
Original height (H)
CC10
13.1 Abnormal noise
Main causes :
• Excessive suction vacuum, due to :
a pipe, accessories (valves, filter...) which are either clogged
or of insufficient diameter,
excessive suction head (e.g. during liquid transfer opera
tions),
a viscosity or vapour tension too high for the system to cope
with (e.g. when changing the product to be pumped).
• Overly high rotation speed for the liquid being pumped.
• Pump damaged
as a result of binding due to :
• an excessively high rotation speed,
• failure to release the drive when pumping is ended,
• sudden engagement of the drive,
• an unduly high pulling force on the shaft, leading to a
damaged ballbearing and shaft.
as a result of foreign matter, due to :
• the absence of a filter or inefficient cleaning,
• the absence of a basket (faîlure to replace it after clea
ning),
• solder or rust particles remaining in the pipe between
the filter and the pump.
• Bypass valve hammer on its seat due to incorrect adjust
ment of the spring's tension.
• At least one vane mounted in the wrong direction during a
reassembly.
NT 1010P00 09 20 CC1024 A e
12. MAINTENANCE
Change if "H" <
26,3
24,3
13. TROUBLESHOOTING
OBSERVE ALL SAFETY WARNINGS CONTAINED IN THIS MANUAL.
12.3 Cleaning the filter
The pump should always be protected against possible foreign
matter by means of a filter connected into the suction pipe.
Check the cleanliness of the filter mesh from time to time as
a.partly clogged filter could starve the pump and reduce its output.
To clean the filter, remove the meshes and clean them care
fully. Before refitting them, drain the filter by removing the drain
plug, then rinse it thoroughly.
CAUTION :
13.2 Leaking seal
Main causes :
Abnormal pulling force on the shaft, leading to a damaged
bearing and seal,
Displacement of the shaft when mounting an unduly tight
coupling making the seal unserviceable,
Seal damage caused by pumping an agressive product,
13.3 Inadequate output
Main causes :
Excessive suction vacuum (see § A
suction vacuum),
Bypass setting too low,
Air leaking in at suction end,
Discharge pipe diameter too small,
Speed of rotation too low,
Bypass valve not closing properly due to foreign matters on
valve seat or because the valve lifting wheel (in the case of
pumps fitted with one) has not been returned to its initial
position after use,
Pump damaged (see § A
passage of foreign matter).
16/18
Excessive
BNORMAL NOISE
Pump damaged due to
BNORMAL NOISE