Goulds Pumps VIT - IOM - Manual (Page 44)

The motor must rotate counterclockwise when viewed from the top. See the arrow on the pump
nameplate. If the motor does not rotate counterclockwise, change the rotation by interchanging any
two leads (for three phase only). For single-phase motors, see the instructions from the motor
manufacturer.
If motor shaft-end-play adjustment is required, check it using a dial indicator before you connect the pump
coupling to the solid-shaft motor. Consult the applicable motor manufacturer instruction manual for
detailed information on motor shaft end play.
Install the coupling hub
1. Apply a thin film of oil on the pump key and insert the key into the headshaft keyway seat.
2. Gently lower the pump half of the coupling hub onto the headshaft.
3. Thread the adjusting plate onto the headshaft until it is flush with the top of the headshaft.
4. Apply a thin film of oil to the driver key and insert the key into the drive-shaft keyway seat.
5. Place the driver half of the coupling hub onto the drive shaft with the key and slide it up the drive
shaft until the annular groove is exposed.
6. Install the split ring in the groove and slide the driver half of the coupling hub down over the split
ring to capture it.
7. If the pump is supplied with an adjustable spacer coupling, install the spacer between the headshaft
and the drive shaft hubs.
8. Secure with capscrews and hex nuts.
Impeller adjustment
NOTICE:
• When a mechanical seal is provided, make sure it is not secured to the shaft during impeller
adjustment. The shaft must move up or down within the seal assembly.
• For pumps that handle liquids between -50°F to 200°F (-45°C to 93°C), you can make impeller
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 situations 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 could cause contact between the rotating and stationary parts, resulting
in sparks and heat generation.
Example figures
Impeller adjustment is identical for all drivers. Adjust the impeller by turning the adjusting plate.
At location A in thesetwo figures, measure the impeller adjustment before you tighten the coupling capscrews:
Installation (Continued)
42 Model VIT Installation, Operation, and Maintenance