6
HS SERIES MULTISTAGE PUMP DISASSEMBLY
1.
Disconnect the power supply and release the pump pressure before removing the
pump to do any repairs.
2.
Remove the eight casing screws with a 5mm allen key turning anti-clockwise. Sit
the pump on the fan cowl for easier removal of the screws.
3.
You may have to put a flat blade screwdriver between the casing and the back plate
to pry it off.
4.
The first stage body should lift off and it should also have an oring with it. If it is not
still attached to the stage body, check inside the casing to see if it is stuck to the
inside. If so remove it and check for flat spots and tears.
5.
You will now see a stainless steel nut that holds the rest of the pump assembly in
place. This is removed with a 17mm ring spanner. You will need to sit the pump
horizontally and remove the fan cowl. Place a flat blade screwdriver into the slot in
the rotor, hold it tight and give the spanner a sharp tap with a softhead mallet to
loosen the impeller screw.
6.
Remove the impellers wear rings and stage bodies and check for wear or rub
marks.
7.
Remove the mechanical seal and casing oring. Check for wear or signs of heat on
the seal faces and rubber boot. Check the oring for tears or flat or pinched spots.
8.
The back plate can be removed by inserting a small punch through the holes in the
motor end shield and tapping it off. Remove the slinger from the shaft. Check,
clean or replace all parts before you reassemble the pump.
