IMO 3215/525, Instruction Manual And Parts List, Page: 6 / 11

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H.3 DISASSEMBLY PROCEDURES – See assembly drawing
SPECIAL NOTE: To service mechanical seal and ball bearings ONLY perform H.3, Steps 1,
7, 8 and 9 and 10 and H.4, Steps 8, 9, 10, 11 and 12.
CAUTION
Fluid leakage from disassembly of pump may make floor slippery and cause
personal injury.
1. Close suction and discharge piping to pump and disconnect piping. Remove seal piping (71).
Remove drain plugs (67), and drain unit. Remove pump from driver, coupling and base plate.
Remove coupling hub and key (31).
2. Remove bolts (4) and inlet head (2). Remove Gasket (9) from inlet head (2).
3. Remove spiral rings (8) from grooves in case (1).
4. Remove thrust cage (29), then tube (26) from either cage (29) or inlet housing (24).
5. Remove idler balance piston housings (23) from suction idlers (21).
6. Remove suction idlers (21) by unscrewing them from inlet end of pump. Remove remaining
idlers (35) from housings (24), (50), by rotating power rotor (63) in a counter-clockwise
direction.
CAUTION
Do not permit idlers (21), (35), to drop as they emerge from housings (24), (50).
7. Remove bolts (47) and bearing retainer (43) from inboard cover (46).
8. Remove assembled power rotor (63). Removal of power rotor (63) includes removal of Truarc
rings (42), ball bearing (49), seal adapter (48), spacer (38) and mechanical seal (25).
9. Disassemble power rotor (63) as follows:
a. Using a flat nosed tool, such as a screw driver, remove Truarc rings (42) located on both
sides of ball bearing (49) from their grooves in power rotor (63).
b. Sealed ball bearing is assembled to power rotor (63) with light press fit. Ball bearing (49)
may be removed by using a bearing puller or a vertical arbor press. When using press, two
pieces of key stock are to be placed through openings of mechanical seal seat adapter (48)
underneath ball bearing (49) on both sides of power rotor shaft. Key stock should be long
enough to support power rotor (63) as it is placed in press. Press ram is to be positioned
against power rotor (63) coupling end face. Gently press power rotor (63) through ball
bearing (49). Ensure power rotor (63) does not fall to floor once ball bearing (49) is off of its
diameter.
c. Remove seal seat adapter (48) from power rotor (63), then remove mechanical seal
stationary seat from seal seat adapter (48). Loosen set screws on mechanical seal rotating
assembly body and remove from power rotor (63). Remove spacer (38) from the power
rotor (63).
10. Remove Gasket (84) from inboard end cover (46).
11. Remove bolts (4) and inboard cover (46) from case (1).
12. Remove Gasket (9) from inboard cover (46).
13. Remove Truarc ring (101) from retainer (100) and retainer (100) from case (1).
14. Remove balance piston housing (78) from case (1) and O-ring (28) from balance piston
housing (78).