11
Operation and Maintenance Manual
QC Series Centrifugal Pump
QC-M02
The traction between shafts is achieved by friction. By tightening the drive collar bolt (s) (
92A
),
the drive collar plus (
92
) and the stub shaft (
6P or 6E
) closes pressing the motor shaft. To have
an optimum performance it is necessary to align the three groups of the assembly: 1.- The motor
shaft keyway 2.- the groove 3.- the side groove in the drive collar just as shown in
Figure B.
Slide the drive collar plus thru the stub shaft all the way, then slide both of them thru the motor
shaft making the three grooves coincide. Remember the motor shaft key is not needed.
STANDARD STUB SHAFT
Place the backplate onto the adapter and turn it in a counter-clockwise direction, locking the
backplate pins (
11F
) onto the adapter pins (
71A
). If necessary pull out the stub shaft so that it is
still mounted onto the motor shaft. Place the retainer (
24
) into the stub shaft so that it recedes
completely into its slot and insert the impeller onto the stub shaft, making sure that the retainer
falls to one side to secure the impeller. Space the back of the impeller at a distance of 0.070 in.
from the face of the backplate and tighten the set screws in order to secure the stub shaft.
STUB SHAFT PLUS
Next, place the backplate onto the adapter (
71
) and turn it in a counter-clockwise direction,
pressing it against the adapter so that the backplate pins (
11F
) lock onto the adapter pins (
71A
).
Place the impeller plus (
2P
) onto the stub shaft after placing the key (
24C
) into the key slot on the
shaft. Screw on the impeller nut (
24D
) and tighten until it makes contact with the impeller using
a socket (5/8” or 7/8” depending on the model).
You can use a 0.375 in. steel rod in the side hole of the shaft so that the shaft does not turn
during assembly. Space the impeller at a distance of 0.070 in. from the face of the backplate.
STUB SHAFT TIGHTENING
With the .070 in separation, and tighten the collar screws to set the stub shaft. Use
v
to find the
appropiate torque values before tightening, remember to allign the three parts grooves.
IMPORTANT:
At this point the adapter is mounted, the stub shaft is fixed on the motor, and the
impeller is spaced at a distance of 0.070 in. from the backplate. Take off the impeller and remove
the backplate to begin assembling the mechanical seal.
Place the deflector (
40
) in the ridge found on the standard stub shaft. Stub shafts plus do not
use a deflector.
ASSEMBL
Y