IMO *G3D-187, Instruction Manual

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NOTE: Based on mechanical seal design, removal of spacer (014) can remove mechanical seal
stationary assembly.
*
Note: Some idlers have a hydrostatic thrust design and do not use idler cups (020).
NOTE:
Power rotor (011) with balance piston is a sub-assembly. Do not remove balance piston as parts
are not sold or serviced separately.
(e) Remove mechanical seal. Refer to Mechanical Seal Disassembly procedures for removal of
stationary assembly (1 and 2) and rotating assembly (3).
(f) If applicable, remove truarc ring (035) or shim (051).
NOTE: Balance piston (012) furnished as part of power rotor (011) and bushing (033) furnished as part of
inboard cover (009) and are not serviced separately when used on specific pump types.
Assembly Procedures (Figures 18 through 21)
NOTE: Prior to assembly 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,
mechanical seals and ball bearings when these parts are disturbed from their previously installed
position. Refer to pump assembly drawings, Figures 18 through 22, inlet head arrangements
Figure 26, special inboard construction, Figure 25, mechanical seal drawings and assembly
drawings, Figures 2 through 17, and List of Material, Table 5, during pump assembly. Coat all
parts with SAE-30 oil to assist in assembly. Assembly procedures for all G3D pumps with
mechanical seals are identical except when specifically noted.
1. Install O-ring (006) into groove of rotor housing (002). Install O-rings (005) on tube (004) and install
tube (004) in housing (002).
2. (Figures 18 through 21) Install housing (002), O-ring end first, in inlet end of case (001) until housing
(002) is flush with inlet end of case (001). Align spacer (027) with tube (004) and install spacer (027)
in case (001).
NOTE: Spacer (027) not installed on rotor size 312 pumps.
3. (Figures 18 through 21) Install O-ring (007) on inboard cover (009).
4. Install inboard cover (009) on case (001). NOTE: Ensure that tube (004) enters inboard cover (009)
tube bore.
5. Install capscrews or bolts (003, 010 or 031) and torque bolts or capscrews (003 or 010) to proper
value as given in Table 3.
NOTE: If installed, lockwashers (030) will be installed with bolts (010).