Bell & Gossett VTP2006 Series VTP – Vertical Turbine Pumps - Manual (Page 30)

30
Disassembly And Reassembly – SECTION 6
DISASSEMBLY
Before working on pump or motor, lock
out driver power to prevent accidental
startup and physical injury.
NOTE: Pump components should be match-marked
prior to disassembly to ensure they are
reassembled in the correct location.
HEAD AND COLUMN
1. On pumps which are driven through a gear drive,
remove the driveshaft between the gear and the
prime mover.
2. On pumps, which are electric motor driven, remove
the electrical connections at the conduit box and tag
the electrical leads, so they can be reassembled the
same way they were disassembled.
3. Uncouple driver (or gear box) from pump shaft and
mounting flanges and lift off by the lifting lugs or
eyebolts as furnished.
Never try to lift entire pump assembly by
the lifting lugs or eyebolts furnished for the
driver only.
4. Disconnect discharge head from the discharge
piping. Remove all hold down bolts and external
piping. Remove coupling, packing box and proceed
with disassembly down to the bowls by reversing
the procedures described in detail for assembling the
unit.
BOWL ASSEMBLY
The bowl assembly is composed of a suction bowl/bell,
intermediate bowl(s), top bowl, impellers and securing
hardware, bearings, and pump shaft.
Turbine bowl impellers are secured to the shaft by either
a taperlock or a key and split thrust ring. Follow only
those procedures that apply to the particular construction
supplied.
NOTE: Match mark bowl assembly in sequence of
disassembly to aid in the reassembly procedure.
TAPERLOCK CONSTRUCTION BOWL
DISASSEMBLY
1. Remove capscrews that secure top intermediate
bowl (669), not shown, to intermediate bowl (670).
See Figure 1 or 2.
2. Slide discharge bowl and top bowl off the pump
shaft (660).
Disassembly And Reassembly – SECTION 6
WARNING
WARNING
Figure 20
3. Pull shaft out as far as possible and strike the hub of
the impeller by taperlock driver, or equivalent, until
the impeller is off the taperlock (See Figure 20).
4. After the impeller is free, insert a screw-driver into
the slot in the taperlock and spread it open. Slide
the taperlock and impeller off the pump shaft.
5. Repeat the above procedures until the bowl
assembly is completely disassembled.
KEYED BOWL DISASSEMBLY
1. Remove capscrews that secure top bowl (669) to
intermediate bowl (670).
2. Slide top bowl off the pumpshaft (660).
3. Remove capscrews (759) and split thrust ring (725)
from pump shaft.
4. Slide impeller off the pumpshaft and remove the
key (730). If impeller is seized to the shaft, strike
impeller with a fiber mallet and drive impeller off
the pumpshaft.
5. Repeat the above procedures until the bowl
assembly is completely disassembled.
TURBINE BOWL – WEAR RING REMOVAL
1. Remove set screws or grind off tack weld, when
rings are furnished with those locking methods.
2. Utilizing a diamond point chisel, cut two “V” shaped
grooves on the bowl wear ring approximately 180
degrees apart. Use extreme care not to damage the
wear ring seat.
3. With a chisel or drift, knock the end of one half of
the ring in, and pry the ring out.
4. On special materials such as chrome steel, set up the
bowl in a lathe and machine the wear ring off using
extreme care not to machine or damage the ring
seat.
SHAFT
IMPELLER
BOWL
TAPERLOCK DRIVER
DISASSEMBLY POSITION