4.3.6.1 Install the coupling hub and make pump rotor adjustment
NOTICE:
•
Ensure motor alignment is performed prior to coupling installation.
•
Impeller adjustment is identical for all driver types.
•
The impeller lift is measured from height required for the rotor to turn freely (i.e. as the
rotor is lifted up from its resting position, the point at which the rotor spins freely is the lift
datum, A=0).
•
Adjust the pump rotor lift by turning adjusting nut. Ensure backup ring (if supplied) is
placed and bottomed out prior to coupling installation.
1.
Apply a thin film of oil on the pump key (8) and insert the key into the pump rotor (7) keyway seat.
2.
Gently lower the pump hub (6) onto the pump rotor (7).
3.
Thread the adjusting nut (9) onto the pump rotor (7) until it is flush with the top of the pump rotor (7).
4.
Apply a thin film of oil to the driver key (2) and insert the key into the driver shaft keyway seat.
5.
Place the driver hub (3) onto the driver shaft (1) with the key (2) and slide it up the driver shaft (1)
until the split ring groove is exposed. Ensure the driver hub is in contact with the split ring.
6.
Install the split ring (11) in the groove and slide the driver hub (3) down over the split ring (11) to
capture it.
7.
Install spacer (4) securely to driver hub (3) with cap screws (10A) with torque to specified value on
General Arrangement drawing.
8.
Obtain pump rotor lift setting (A) from the order-specific General Arrangement drawing.
9.
Turn the adjusting nut (9) until the gap between the adjusting nut and the coupling spacer (4) is
equal to A.
10. Hand tighten two cap screws (10B) between coupling spacer (4) and pump hub (6) until pump rotor
can just be rotated by hand.
11. Measure the gap between coupling spacer (4) and pump hub (6). If this gap is equal to A, proceed
to step 12. If not, remove two cap screws, lower pump hub, and readjust adjusting nut.
12. When the specified lift, measured between pump rotor hub (6) flange and spacer (4) flange, is ach-
ieved, secure the spacer to the pump hub with cap screws (10B) and torque to specified value on
General Arrangement drawing.
13. Install and securely tighten locking set screw (5A) in line to keyway on the pump hub.
14. Install two set screws (5B) located 90° to keyway, gradually tightening on each side until both are
securely installed.
15. Check that all set screws are securely installed.
4.3.7 Impeller adjustment
NOTICE:
•
When a mechanical seal is provided, make sure it is not secured to the shaft during im-
peller adjustment. The shaft must move up or down within the seal assembly.
•
For pumps that handle liquids between -45°C to 93°C | -50°F to 200°F, you can make im-
peller adjustments under ambient conditions. For liquids in excess of this range, make
any impeller adjustments after the pump reaches the temperature of the liquid. In situa-
tions where this is not feasible due to safety considerations, or impossible due to external
ice buildup in cryogenic applications, refer to the factory for specific instructions.
•
Improper impeller adjustment can cause contact between the rotating and stationary
parts. This may result in sparks and heat generation.
4.3 Installing a disassembled pump
40
Model VICR Installation, Operation, and Maintenance Manual
