Blackmer Seal-less Internal Gear Pump (copy) E1-2 CARBON STEEL .

Remove the old bushing by pressing it out of the idler. It is not unusual for carbon graphite bushings to crack or break apart during removal

Inspect the idler bore for any damage. Any small scratches or nicks must be filed smooth before installing the new bushing

Press the new idler bushing into the idler leading with the tapered edge

Bushing is in its proper location when both ends of the bushing are flush or slightly recessed from the idler face

Sign off on the idler bushing replacement

Cut the sleeve without damaging the rotor in the area around the front O-ring

Pull sleeve off of the rotor assembly

Remove the old magnet segments from the inner ring

Remove the front and rear sleeve O-rings from the grooves in the rotor

Install new O-rings in the grooves of the rotor

Bring one end of the new magnet segment into contact with the end of one flat on the inner ring

Slide the magnet segment along the length of the inner ring until it touches the small stop at the end of the inner ring

Repeat steps 6 and 7 for the other magnet segments, ensuring each magnet is in opposite polarity with adjacent magnets

Align the new sleeve over the back of the rotor such that the sleeve indentations are lined up with the magnets

Position the outer drive assembly on blocks in a suitable press with the shaft facing upward

Remove the snap ring from its groove in the shaft

Press the shaft downward until the outer bearing disengages from the shaft

Remove the outer ring assembly with shaft and inner bearing attached, wave spring and outer bearing

Remove the inner bearing from the shaft with a suitable gear puller

Apply a light oil to the shaft and press the new inner bearing into the shaft. The new bearing inner race should be flush with the outer ring. Be careful to avoid disrupting the shaft position relative to the outer ring

Insert the wave spring into the inner bearing counter-bore of the magnet housing /bearing housing

Insert the outer ring/shaft/inner bearing assembly into the magnet housing/bearing housing

Press the outer bearing onto the shaft until the distance from the end of the shaft to the face of the bearing

Warning: This procedure requires trained personnel with PPE!

Direction of shaft rotation changed from RT to LT?

Discharge and suction positions relative to the casing and head changed?

Relief valve disassembled (if equipped)?

Casing orifice plug and casing block-off plug removed?

Casing orifice plug installed behind the DISCHARGE port (if required)?

Head block-off plug moved to the DISCHARGE side (if equipped)?

Instructions for changing from RT to TL without changing the direction of shaft rotation

Check if the pump is equipped with a relief valve

If the pump is equipped with a relief valve, follow the next steps

Disassemble the pumping chamber

Assemble pumping chamber in the new orientation

Sign off on the port orientation replacement