Xylem IMVIT R01 Model VIT Vertical Industrial Turbine Pumps - Manual (Page 20)

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11. Install motor drive coupling. (Be sure to line up the
match mark made at step 6.) Inserting the ratchet
pins if a non-reverse ratchet is used. Match the
coupling lugs with corresponding holes in motor.
Tighten hold down bolts evenly, making sure driver
coupling is properly seated in the register fit.
12. Fit gib key (730) into keyway, by filing if necessary,
to where there is a snug but sliding fit. This key
must be able to be removed by gentle leverage with
a screwdriver under it.
13. Be careful that the gib key (730) is not too high so
as to hold up the adjusting nut (604) from seating
on the drive coupling. If it is, cut off some length of
the key.
14. Install adjusting nut (604) to hand tight.
COMBINATION ENGINE AND MOTOR DRIVES
1. On combination drivers, the motor is invariably on
top with a projecting head shaft extension.
2. Follow all procedures outlined in the previous
paragraph, except that the motor must be lowered
over this extended head shaft and great care must be
taken to center it exactly so as not to bump or mis-
align the shaft while the motor is being lowered into
place.
3. There are several methods of running engines
without electric motors and vice versa, requiring
simple adjustment to the combination drive, but
they are too numerous to mention here and can be
obtained from the gear manufacturers instructions
included with the shipment.
IMPELLER ADJUSTMENT FOR ALL
HOLLOW SHAFT DRIVERS
NOTE: Shaft adjustment up or down is accomplished by
turning the adjusting nut (604) Figure 13.
NOTE: There are five holes in the adjusting nut and
only four in the motor coupling. See Figure 13.
1. With shafting all the way down and the impellers
resting on their seats, turn the adjusting nut (604)
in counter-clockwise direction, thus lifting the shaft,
until the impellers just clear their seats and the
shaft/motor turns free by hand. This removes all
deflection from the shaft.
2. If pump setting is 200 ft. or less, make another two
turns on the adjusting nut for the first 100 ft. (3
turns for 12 thread/inch shaft). Line-up one of the
holes in the adjusting nut with the nearest hole in
the driver coupling. Insert the capscrew in the hole
and tighten it.
NOTE: 1.00" and 1.18" diameter shafts are 12 thread
per inch (tpi), 1.50" through 2.44" are 10 tpi, all
larger sizes are 8 tpi.
3. For pump setting over 200 ft. see IOM for DWT.
FOR OPEN IMPELLERS
1. With shafting all the way down and the impellers
resting on their seats, turn the adjusting nut (604)
in counter-clockwise direction, thus lifting the shaft,
until the impellers just clear their seats and the
shaft/motor turns free by hand. This removes all
deflection from the shaft.
2. Align hole “A” in the
adjusting nut (604) and
hole “C” in the driver
coupling (See Figure13) or
whatever similar holes are
in like position. If care is
exercised, this will give an
initial impeller clearance
of 0.001” to 0.003”
depending on shaft size or
the pitch of the thread.
3. Insert capscrew into hole
“B” provided these are the
nearest matching holes
for counter-clockwise
rotation of adjusting nut,
turn adjusting nut counter-
clockwise until holes “B”
and “D” line up. This
gives 1/20 of a turn
which is 0.004”
on 12 tpi shaft or
0.005” on 10 tpi
shaft.
4. Normal impeller
clearance for the
open impeller is
consider to be 0.015”
for the first 10 ft of
the column length and
0.010” additional clearance for each 10 ft of length
thereafter. This can be reduced in some instances
where is necessary, but should not be attempted
without consulting the factory or factory serviceman
if present.
INSTALLATION OF A SOLID SHAFT DRIVER
NOTE: When pump is supplied with an oil lubricated
thrust pot, do not secure driver to discharge
head until after the thrust pot and flexible
coupling are installed. (See page 22 for thrust
pot installation instruction.)
Do not work under a heavy suspended
object unless there is a positive support
and safe guard which will protect personnel should a
hoist or sling fail.
The coupling between the driveshaft and discharge head
shaft may be a non-spacer type (see Figure 14), or a
spacer type (see Figure 15). The latter is used on pumps
furnished with a mechanical seal to permit servicing of
the seal without removal of the driver.
1. Driver support. When a driver support is furnished
and not installed, proceed as follows.
A. Hoist driver support, inspect the mounting
surfaces, register and clean these surfaces
thoroughly.
B. Install driver support on discharge head and
secure with capscrews provided.
2. Attach a sling to the lifting lugs of driver, hoist
motor, inspect the mounting surface, register, and
shaft extension, and clean those surfaces thoroughly.
If any burrs are found, remove burrs with a smooth
mill file, cleaning thoroughly afterward.
(604) ADJUSTING NUT
LOWER IMPELLER
RAISE IMPELLER
MOTOR COUPLING
ROTATION
A
B
G
D
H
C
E
F
WARNING
Figure 13