Wilo VT - Reassembling the Pump

Installation and operating instructions WILO Mather and Platt – VT pumps 39
11.5 Re-assembly of Pump
• Prepare the foundation block as per the dimension
mentioned in GA drawings of the pump.
• Install the sole plate and check the levelling of sole plate
with master level. The acceptable limit for the sole plate
levelling is within 0.05 mm.
• Then install canister pipe* (*only if applicable as per the
GA Drg.) and check that the sole plate levelling is not
disturbed.
• Fix strainer to suction bell mouth. Add casing neck ring to
suction bell and in the diffuser/bowl. Insert the O-ring in
grooves provided on both suction bell and diffuser/bowl.
• Add wearing ring on both sides of impeller and bearing
bushes in diffuser/bowl.
• Add pump bearing sleeve on pump shaft and then slide in
the impeller and lock it in position via a key and impeller
lock nut from bottom.
• Place this assembly vertically in suction bell, suitable
support should be provided to shaft to be suspended
vertically.
• Slide in the diffuser/bowl from top followed by bottom
column pipe. Then insert the pump bearing bracket with
bush fitted in it. O-ring should be fitted on both side of
bearing bracket. Then connect the taper piece to the
diffuser/bowl assembly.
• Assemble the intermediate bearing bracket and bush to
diffuser/bowl assembly.
• Connect the forced lubrication pipe* (*only if applicable
as per the GA Drg.) coming from discharge bend/external
pump as per drawing.
• Assemble the split collar to connect the bottom shaft to
the intermediate shaft and then assemble the muff
coupling along with grub screw.
• Now lower the intermediate column pipe with the help of
slings on bottom pipe. Tighten all intermediate column
pipe nuts and bolts. Repeat the above procedure till
column length assembly is achieved as per the GA Drawing.
• Fix the top pipe to delivery bend and the first intermediate
column pipe along with the bearing bush assembly from the
top.
• Fix the loose stuffing box onto the motor stool with
packing, logging ring.
• Fix oil retainer bush, retainer plate and lower bearing race in
bearing housing and mount this housing onto the motor
stool.
• Initially connect head/top shaft to intermediate shaft.
Gland sleeve to be fitted in shaft. Now motor stool should
be inserted slowly via slings till the bottom machined face
of bottom plate of motor stool rests on top face of column
pipe flange. Secure the assembly with the help of studs.
• Once this is done, lower the motor stool onto the sole plate
and firmly secure it with the help of studs. Check the
levelling of motor stool after fitment on the sole plate. The
acceptable limit for the sole plate levelling is within 0.05
mm.
• Care to be taken to insert water thrower on the head shaft
while lowering the motor stool.
• Now assemble the oil retainer bush, bearing housing and
then fix the upper race of bearing followed by thrust block,
ratchet plate/housing cover, ratchet bush and pins, lock nut
and locking screw. Then adjust the float of the pump as per
the GA drawings.
• Rest the pump half of flexible coupling on the top shaft with
adjusting ring below. Thickness of the adjusting ring to be
maintained based on the gap between the coupling half
mentioned in GA drawings. Machine the adjusting ring if the
gap is less than the required. Refer the below procedure -
• Fix the coupling halves of the pump and motor.
• Assemble the motor on the motor stool.
• Check the gap between the coupling halves with the feeler
gauges.
• If the gap is less dis-assemble the motor and then machine
the adjusting ring.
• Care to be taken to maintain recommended gap between
both coupling faces.
• Thickness of the adjusting ring can be varied as per assembly
requirement.
• Then fix the gland and other accessories such as pressure
gauge, air release valve, vibration sensor etc. on the motor
stool.
• Ensure the cooling pipeline is completed/connected for
cooling coil.
• Ensure the stuffing box leak-off connection are done if
gland leakage is heavy.
Re-assembly of a below floor installation pump
• Prepare the foundation block as per the dimension
mentioned in GA drawings of the pump.
• Install thrust pipe on the column/slab/channel as shown in
the GA Drawing.
• Assemble the delivery bend/tee column pipe to the
intermediate column pipe along with the bearing bush
assembly.
• Fix strainer to suction bell. Add casing neck ring to suction
bell and in diffuser. Insert the O-ring in grooves provided on
both suction bell and diffuser.
• Add wearing ring on both sides of impeller and bearing
bushes in diffuser.
• Add pump bearing sleeve on pump shaft and then slide in the
impeller and lock it in position via a key and impeller lock nut
from bottom.
• Place this assembly vertically in suction bell, suitable support
should be provided to shaft to be suspended vertically.
• Slide in the diffuser from top followed by bottom column
pipe. Then insert the pump bearing bracket with bush fitted
in it. O-ring should be fitted on both side of bearing bracket.
Then connect the taper piece to the bowl assembly.
• Assemble the intermediate bearing bracket and bush to
diffuser/bowl assembly.
• Assemble the split collar to connect the bottom shaft to the
intermediate shaft and then assemble the muff coupling
along with grub screw.
• Now lower the intermediate column pipe with the help of
slings on bottom pipe. Tighten all intermediate column pipe
nuts and bolts. Repeat the above procedure till column
length assembly is achieved as per the GA Drawing.
• Assemble the delivery bend/tee column pipe to the first
intermediate column pipe along with the bearing bush
assembly.
• Install the sole plate and check the levelling of sole plate with
master level. The acceptable limit for the sole plate levelling
is within 0.05 mm.
• Assemble the motor stool and top shaft along with muff
coupling and split collar, shaft key and the grub screw