Installation and operating instructions WILO Mather and Platt – VT pumps 28
8.5 Thrust pipe arrangement installation
• In case of below floor delivery arrangement, an arrangement
is provided to absorb back thrust. Initially fix the insert plate
in column wall as per dimensions shown on GA drawing with
the help of provided anchor bolts. Match the pump delivery
center line with insert plate and thrust pipe center line. Once
the centers of all three have been matched, weld the thrust
pipe onto insert plate; ensure that thrust pipe flange face is
perpendicular to delivery center line. First ensure complete
delivery line is connected to discharge tee without any piping
/ pulling stress.
• Fasten the thrust pipe against the delivery bend as shown in
figure. Adjust and lock the delivery bend in place by adjusting
the locknut provided between the both. 50 mm or less
difference can be maintained between the both depending
upon site conditions. (Refer Fig. 13 Pg. No. 10)
8.6 Thrust Bearing and Coupling Installation
(Refer Fig No. 16 Pg. No. 12)
CAUTION! Risk of material damage!
Pump oil level to be checked and maintained at as per
pump manufacturer’s recommendation. Low oil level
can result in bearing damage and high oil level will
cause excessive oil leakage.
• Thrust bearing assembly provided on this pump comprises of
bearing housing, cover, thrust block, locknut, Oil lubricated
spherical roller thrust bearing or Grease lubricated deep
groove ball bearing as Guide bearing, angular contact ball
bearing as Thrust bearing. The outer race of bearing is fitted
in the housing whereas the inner race is fitted on the thrust
block.
• For grease lubricated bearing the top surface of thrust block
is provided with 6 or 8 equispaced holes into which the
locking screw can be engaged. The rotating element is set at
desired position by engaging the locking screw in the nearest
hole, after rotating the lock nut through requisite number of
turns.
• This thrust bearing assembly requires very little maintenance
other than occasional feeding up of lubricating Oil/Grease.
The thrust bearing assembly should be completely
dismantled, cleaned and reassembled after 8000 hours
approximately (Grease lubricated bearings) and 2000 hrs.
approximately or as required by site conditions (Oil lubricated
bearings).
• For oil-lubricated bearings when level of oil goes down below
required level, the fresh lubricating oil should be filled up to
the required quantity. For Grease lubricated bearings the
fresh lubricating grease should be filled up to the required
quantity with help of grease gun after every 1000 hrs.
running of pump. Before greasing, the grease drain plug
should be opened so that while filling the fresh grease, the
deteriorated grease drains out.
• During assembly of thrust bearing (oil lubricated) follow the
following procedure:
• Fit oil retaining bush to bearing housing. Then fit inner race
of thrust bearing on thrust block & outer race in bearing
housing. Mount the bearing housing to motor stool. Fit thrust
block on top shaft so that inside diameter of thrust bearing
fits on thrust block and attach the cooling coil. Tighten the
thrust bearing lock nut. Finally fit the bearing cover cum
ratchet plate to bearing housing.
• Once the ratchet plate has been fixed in place mount the
ratchet holder plate with pin and bushes on top / head shaft
• Fit pump half coupling on top shaft. An adjusting ring is
provided below pump half coupling. This ring can be
machined to maintain the recommended gap between pump
half and motor half coupling. Place the motor on top flange
of motor stool and complete the alignment.
Note:
During tightening of thrust bearing locknut, maintain the
total float of pump as per pump manufacturer’s
recommendation. Refer table for details. Finally lock the lock
nut to thrust block via lock screw.
For 2000 VMF Pump refer the following:
• Check motor stool face distance from top shaft face
• Fit pump coupling to the top shaft
• Fit spacer lock nut on top shaft
• Lift top shaft with hook /crane as of required height
• Tight spacer lock nut with matching Pump Side (PH)
coupling and coupling holes
• Give support to pump side coupling from bottom side
through stuffing box by jacking screws.
• Release hook from top shaft
• Check distance between pump shaft face to motor stool
face and reset if required.
• Lift motor with Motor half coupling fitted on it by using
crane
• Keep it on motor stool
• Touch the motor half coupling face to pump half coupling
face
• Rotate motor body to match the holes with motor stool
holes
• Fit the fasteners with motor & motor stool
• Fit the coupling fasteners with pump half & motor half
• Release the jacking screws from stuffing box
• Check the freeness of rotor
• Release the motor from hook/crane
• Do the electric work as per wiring diagram
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