9
J. PUMP ASSEMBLY PROCEDURE
Notes:
Prior to reassembly of pump, all parts should be cleaned and inspected for nicks and burrs.
Replace all worn or damaged parts. Imo Pump recommends automatic replacement of
gaskets, O-rings, bearings and mechanical seal when these parts are disturbed from their
previously installed positions. Coat all parts with light lubricating oil to assist in assembly.
Pump model covered in this instruction manual is provided with a Chesterton 180 cartridge type
mechanical seal equipped with Kalrez elastomers. Imo Pump recommends coating all pump
components with a silicone based lubricant during pump assembly.
If new rotor housings (8 & 10) are installed when performing Step 1, new anti-rotations pins (11) must
be installed. Anti-rotation pins are to be field fitted to each new housing to ensure housing maintains
alignment with pump case and opposite housing. If housing anti-rotation pins are not snugly fitted to
one housing, opposite housing may rotate out of position during pump operation and damage rotors.
To fit new anti-rotation pins, file or grind one or both pins flat surfaces until pin fits snugly into housing
slot. Do not over grind flats.
Step 1.
Install jam nuts (25) and adjusting screws (19) to rotor housings (8 & 10). Install nuts and
screws loosely, do not tighten at this time.
Step 2.
Install spacer (12) to pump case (1) bore, align opening in spacer with discharge port
opening. Align anti-rotation pin slot in housing to pin hole on side of case flange. Slide drive
end rotor housing (8) into pump case (1) inboard end. Repeat for non drive end rotor
housing (10) assuring that rotor housing end faces are fully seated against spacer (12)
faces. To assist in aligning housing bores, install idler rotors (14) into idler bores. Rotate
rotor housings until idlers slide back and forth freely without binding. When rotor housing
bores are aligned, install anti-rotation pins (11) per above note. Slide idler rotors back and
forth again ensure no binding exists. Install pipe plugs (7).
Step 3.
Install shaft bushing (18) to inboard cover (17). Using anti-rotation stop pin (23) as a pilot
hole, drill a 7/16 – inch hole through the bushing. Make sure the bushing flange remains
seated against the inboard cover counter-bore when drilling. Remove the bushing from the
inboard cover and de-burr the drilling. Install bushing insert (57) and install bushing (18) in
inboard cover (17). Install stop pin (23) in inboard cover (17).
Step 4.
Set the rotor housing adjusting screws by the following directions: Rotor housing adjusting
screws (19) at inboard and outboard ends of the pump should be set following the directions
outlined in Figures 2 and 3. To verify correct setting of adjusting screws (19), wipe bluing or
place fuse wire on adjusting screw heads and install inboard end cover (17) with gasket (4)
and bolts (2). Torque bolts to 50 ft-lbs. (67 Nm). Remove inboard end cover and verify
adjusting screw contact with inboard end cover.
CAUTION
DO NOT
exceed .003” (.08 mm) squeeze on adjusting screws
When correct adjustment is confirmed, re-install gasket (4) and inboard cover (17) using bolts (2).
Torque bolts (2) to 155 + 10 ft-lbs. (189 + 13 Nm).
Repeat above procedure for outboard end cover (15) following directions outlined in Figure 3. When
correct adjustment is confirmed for the outboard end cover, proceed to Step 5 before final installation
of outboard cover (15).
Summary of Contents for IMO C324AXFX-12005
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