Australian Pump Industries
Page
3 document number: QPWP151204
DISASSEMBLY & ASSEMBLY
For centrifugal transfer pumps
Check Valve
a. Unscrew suction cover set bolt or screw, and remove the suction cover.
b. Unscrew the set bolt or screw with washer, and remove the check valve.
c. For setting the new check valve, screw the set bolt or screw to fit the valve
with valve seat of suction cover.
d. Install the suction cover with O-ring or packing.
a. Volute Casing
a. Unscrew the casing set bolt, and remove the casing from the casing cover.
b. Remove the volute casing that is placed into casing cover.
c. Install the new volute casing with O-ring or packing into the casing cover
correct position.
d. Adjust the clearance between front surface of impeller and side plate volute
casing to be within 0.2 to 0.5mm (0.008 to 0.020 inch) when the volute casing
is pushed in by adjusting the number of adjusting liners at impellerboss.
e. After confirming the volute casing to the casing cover, and screw the casing
set bolts evenly and tightly.
b. Impeller
a. Disclose the impeller by removing the volute casing same way as above.
b. Loosen the impeller by tapping gently with a mallet in a counter clockwise
direction.
c. Turn impeller counter clockwise, and remove from shaft.
d. Remove the mechanical seal from the impeller, and set it at the back side of
new impeller.
e. Screw the new impeller on engine shaft by turning in the clockwise direction,
and make it tight by tapping gently with mallet in a clockwise direction.
f. Set the volute casing and casing as mentioned above
c. Mechanical Seal
a. Remove the impeller as mentioned above
b. Replace with a new mechanical seal at the back side of removed impeller
and at the seat of casing cover.
c. Check the scaling surfaces of mechanical seal free dust, and set the impeller,
volute casing and casing as in the way abovementioned 3.
For Trash Pumps
Clogged Impeller
a. Unscrew drain set handles and dismantle the drain cover from casing.
b. Dismantle volute casing.
c. Wash impeller with water.
d. Place volute casing O-ring and drain cover O-ring and screw drain cover after
washing sealing surface with water.
e. Screw drain cover set handle evenly at right and left side.
