Speck pumpen Badu Bronze Série Instructions De Montage Et D'utilisation page 39

7.5
CAUTION
Important hints for repair work
Replacement of mechanical seal :
Dismantling :
Switch off the pump and isolate the power supply to the pump. The exchange
of the mechanical seal has to be done by an expert. To replace the mechanical
seal it is not necessary to disconnect the pump from the pipework. Only the
motor unit has to be removed from the pump casing by loosening the eight
screws (914.1).
Removing of the impeller :
With models BADU Bronze 8, 12, 15 the impeller is screwed onto the motor
shaft (right-hand thread). For disassembly : Insert a screwdriver into the slot of
the motor shaft at the impeller side, hold shaft in position and unscrew impeller.
Caution : With three-phase current motors, the impeller is held in place by
means of LOCTITE (similar to cyanacrylic instant adhesive). If necessary, re-
move motor fan blades and clamp motor shaft.
With models BADU Bronze 20, 25 the impeller is pressed onto the motor shaft.
For disassembly : Unscrew the impeller cap (260) with O-ring (412.6). Force the
impeller (320) off the motor shaft by means of a screw M 10 x 50 while holding
the impeller with your hand, and insert screw.
Assembly :
Mounting the impeller :
With models BADU Bronze 8, 12, 15 proceed in reversed sequence (see disas-
sembly). Caution : with three-phase current types, allow pumps to stand idle at
room temperature until the adhesive bond (see disassembly) of impeller / shaft
has hardened completely.
Pressing the impeller back on the shaft with BADU Bronze 20, 25 :
First screw impeller cap (260) with O-ring (412.6) into the impeller hub, then,
with uniform pressure onto the impeller cap, press the impeller onto the shaft
until it hits the limit stop. For the absorption of the counterforce, support the end
of the motor shaft (centre of the fan hoof). Otherwise the force exerted may
stress the ball bearing.
Re-assembly of the motor unit into the pump casing :
Tighten the 8 allen screws (914.1) with approx. 12 Nm tightening torque.
Do not use force !
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