Goulds Pumps VIT - IOM - Manual (Page 46)

Adjust the impeller for a solid-shaft driver
IMPORTANT: The determination of the driver-shaft end-play can be critical and should be added to the
impeller setting noted in this topic. For larger pumps over 8.00 in. (20.32 cm), this amount might not be
sufficient. Refer to the pump outline drawing for details.
When impellers are reset, you must also reset the seal.
Complete these steps based on your impeller type:
If your
impeller is
an...
Then...
Open
impeller
1. With the impellers touching the bottom of the bowls, turn the adjusting plate
towards the driver hub or spacer to obtain a 0.015 in. (0.381 mm) clearance
between the adjusting plate and driver hub or spacer for the first 10 ft. (3 m) of
column.
2. Add 0.010 in. (0.254 mm) for each additional 10 ft. (3 m) of column.
For example, if the total pump length is 50 ft. (15 m), set the open impellers at
0.055 in. (1.397 mm).
3. Align the adjusting plate with the pump hub, and tightly draw the coupling flanges
together with capscrews and nuts.
4. Set the seal:
a. Securely tighten all setscrews in the collar.
b. Remove the spacer between the gland plate and the collar.
c.
Retain the spacer for future resetting of the seal.
Enclosed
impeller
1. Obtain the impeller setting from the Certified Pump Outline Drawing.
2. Align the adjusting plate with the pump hub, and tightly draw the coupling flanges
together with capscrews and nuts.
3. Set the seal:
a. Securely tighten all setscrews in the collar.
b. Remove the spacer between the gland plate and the collar.
c.
Retain the spacer for future resetting of the seal.
Install a hollow-shaft driver
WARNING:
Do not work under a heavy and suspended object unless there is a positive support and safeguards that
will protect you if a hoist or sling fails.
IMPORTANT: When a pump is supplied with a thrust pot, do not secure the driver to the discharge
head until after the thrust pot and flexible coupling are installed.
This figure shows the driving mechanism of all hollow-shaft drives. The drive shaft extends up through the
quill or hollow shaft of the motor (or gear drive) and is held in place by an adjusting nut. This adjusting nut
carries all the static and hydraulic thrust of the impellers and shaft, and also provides the adjustment for
the impeller clearances:
Installation (Continued)
44 Model VIT Installation, Operation, and Maintenance