discharge head
Fig. No.
06
7 of 10
Subject to change without prior notice
INSTALLATION OPERATION AND MAINTENANCE INSTRUCTIONS
VERTICAL TURBINE PUMP - NVT SERIES
Ref. No. NVT-IOM/2020/V.01
Hollow shaft drive(r) refer to hollow shaft motors or hollow shaft gear drives. Clean the top end thread of the middle
line shaft, and the threads of the coupling. Apply a thin film of oil to the threads. Screw the coupling onto shaft for
half its distance. A fine wire inserted in the drilled hole at the center of the coupling can be used as a gage to
determine when the coupling is correctly positioned.
Be sure to remove the wire after installing the coupling. Upon completion of the installation pump run out should be
checked at the positions indicated in the Fig.
No. 6
. Attach the base of the dial indicator on the discharge head or driver
support. Place the stylus on the shaft at the locations indicated in Fig. No.
06
. Rotate the shaft slowly
360
°. Check that
the shaft run out is within
0.06
". (
1.5
mm) TIR.
5.3. Mounting hollow shaft drive(r)
After finishing the installation of the coupling, inspect the driver mounting flange of the discharge head and clean the
surface thoroughly. Remove the driver top cover cap screws and lift off the cover. Remove the top drive coupling or
clutch and the hold down bolts.
Attach a sling to the lifting lugs of the driver and hoist the driver up. Inspect the mounting surface register and clean
these surfaces thoroughly. Any burrs found on the mounting surface should be removed using a smooth mill file and
clean afterwards. Position the driver above the discharge head. Orient the terminal box of the motor or input shaft of
the right angle gear in the desired position.
Align the driver mounting holes with the respective holes on the top surface of the discharge head. Lower the driver
until the registers engage and the driver firmly rests on the discharge head and secure the driver with the provided cap
screws. Now take top shaft and position it properly over the motor quill shaft. Lower it through the motor quill shaft
to meet the middle line shaft top coupling. Apply a thin film of oil to the threads of the top shaft.
Screw the top shaft into the coupling manually until the resistance is felt. Completely tighten the joint using a pair of
pipe wrenches. Follow the alignment checking procedure described in the section
5
.
3
and ensure the proper alignment.
Lubricate the driver bearings and make the necessary cooling line connections for gear drives. With the motor in place
and top shaft projecting through the driver quill shaft make temporary electrical connections. After removing the
foundation all around. Remove the air bubbles from grout as it is poured by puddling, using a vibrator, or pumping
the gout into place. Level off the grout flush with the top of the dam. Allow the grout to cure at least
48
hours and
after that tighten the foundation bolts.
