IMO 3215/525, Instruction Manual And Parts List

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15. Remove idler stop (80) from balance piston housing (78) by removing bolts (81). Remove pin
(73) from idler stop (80). Remove floating balance piston bushing (79) from balance piston
housing (78).
16. Remove stop pin (6) and Dyna seal (7) from case (1).
17. Remove housing (50) from case (1) and O-ring (28) from housing (50).
CAUTION
Do not permit housing (50) to drop as it is removed from pump.
18. Remove aligning vent pins (77) from housing (24 or 50).
19. Remove housing (24) from case (1).
CAUTION
Do not permit housing (24) to drop as it is removed from pump.
H.4 PUMP ASSEMBLY PROCEDURE
Note: Bolts (81) have Nylok in threads. Torque stated on assembly drawing for bolt (81) does
not include additional torque required to install fasteners containing Nylok inserts. Torque
required for first application is much higher than it is for subsequent applications. To
ensure required preload on a Nylok fastener is achieved for each application, the
following procedure is mandatory assembly practice.
1. Using a suitable torque wrench, install fastener in mating piece until Nylok
insert is completely engaged. Note torque required.
2. Add torque measured in step 1. to torque value called for on assembly
drawing.
3. Complete by tightening fastener to torque value determined in 2. above.
Note: 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 replacement of all
O-rings (28), gaskets (9, 84), Dyna Seal (7), mechanical seal (25) and ball bearing (49)
when these parts are disturbed from their previously installed positions. Coat all parts
with light lubricating oil to assist in assembly.
1. Install O-ring (28) in groove of discharge housing (50).
2. Install discharge housing (50) in pump case (1), from suction end, aligning groove on OD of
housing (24) to stop pin hole in case (1). Install stop pin (6) with Dyna Seal (7) in case (1).
3. Install vent pins (77) in end of inlet housing (73) opposite O-ring.
4. Install inlet housing (24) in case (1), ensuring that vent pins (77) engage holes in discharge
housing (50).
5. Install pin (73) in outboard end of discharge housing (50).
6. Install balance piston (79) into balance piston housing (78). Install idler stop (80) on balance
piston housing (78) with cap screws (81). Torque cap screws to value on assembly drawing.
Install O-rings (28) on balance piston housing (78).
7. Install balance piston housing (78) into case (1) being sure that pin (073) in discharge housing
(50) engages pin hole in idler stop (80).
8. Install segmented spacer (100) in groove in case (1), holding in it with snap ring (101).
9. Install Inboard cover (46) on case (1) using bolts (4). Torque bolts to proper value on assembly
drawing.