11
18. Remove housing (2 or 24) and O-ring (6 or 28) from inlet end of case (1). Discard O-ring
(6 or 28).
H.5
PUMP ASSEMBLY
NOTE:
Prior to assembly of pump, clean and inspect all parts for nicks and burrs. Replace
all worn or damaged parts. Imo Pump recommends replacement of all O-rings (6,
28, 88), gaskets (8, 9, 44 or 83), mechanical seal (25) and ball bearing (15 or 49)
when these parts are disturbed from their previously installed positions. Coat all
parts with light lubricating oil to assist in assembly. Inspect power rotor (11 or 63)
shaft and remove any nicks or burrs which are present.
Polish power rotor shaft to
remove any rust or oxidants that may be present under shaft sleeve.
1. Install O-ring (6 or 28) in groove in housing (2 or 24). Install O-rings (5 or 27) in grooves
in tube (4 or 26) and install tube (4 or 26) in housing (2 or 24).
2. Install housing (2 or 24) O-ring end first, in pump case (1) from suction end until stop pin
(46 or 6) slot is properly aligned. Install stop pin (46 or 6) with fastener seal (45 or 7) in
case (1).
3. If pump is C-face version (Figure 5 and 7) proceed below. If pump is foot mount, skip to
step 4:
a. Clean and dry inboard cover (9 or 46) and balance piston bushing (33 or 86) mating
surfaces with solvent. Wipe Loctite “T747” Primer or equivalent onto the mating
surfaces of bushing (33 or 86) and inboard cover (9 or 46). Allow 1 to 5 minutes until
primer is visibly dry. Apply Locitite 609 or equivalent to bushing (33 or 86) and
inboard cover (9 or 46) mating surfaces. Assemble bushing (33 or 86) into inboard
cover (9 or 46). Allow 10 minutes to dry before proceeding with assembly.
b. Install O-ring (6 or 28) on inboard cover. Install inboard cover (9 or 46) into discharge
port side of case (1) using bolts (10 or 95) (and lock washers (92 or 30) if present).
Ensure seal vent (57 or 5) is facing up and pin (4 or 26) in housing mates with hole in
inboard cover (9 or 46). Torque bolts (10 or 95) to value on assembly. Skip to step 7.
4. Install O-ring (6 or 28) on balance piston housing (47 or 22).
5. Install balance piston housing (47 or 22) in case (1) lining up hole in balance piston
housing (47 or 22) with pin (4 or 26) in rotor housing (2 or 24).
6. Install gasket (8 or 9) on inboard cover (9 or 46).
7. Install inboard cover (9 or 46) into discharge port side of case (1) using bolts (10 or 4)
(and lockwashers (92 or 30) if present). Ensure seal vent (32 or 5) is facing up. Torque
bolts (10 or 4) to value on correct assembly drawing.
8. Assemble power rotor (11 or 63) and mechanical seal (25) as follows:
Note:
If no mechanical seal (DKH design in figure 4 and 6), assembly spacer (14 or 48) in
inboard cover (9 or 46) and skip to step (f) below. If pump has mechanical seal proceed with
step (a) below.
a. Assemble spacer (38) onto shaft (11 or 63).
