Disassembly Procedures (Figures 3, 7, 8, 9)
WARNING
When inspecting/servicing shaft seal and/or bearing, power rotor can be removed as a
subassembly with these components installed. Remove four (4) bearing retainer plate
bolts and retainer plate, and then remove power rotor sub-assembly. If for any reason
pump is disassembled further than this, it is possible idler rotor balance piston housings
may fall off. These idler rotor balance piston housings MUST be properly in place at
reassembly. If idler rotor balance piston housings are not properly installed on idler
rotors, pump WILL experience catastrophic failure.
Figures listed are basic pump assembly figures. For variations that may apply to your pump, see figure 16
for seal installation variations.
1.
Close off suction and discharge piping to pump and disconnect piping.
2.
If applicable, remove tubing (071) and, if applicable, check valve (078).
3.
Remove inlet drain plugs and drain unit. Remove pump from driver, coupling and mounting bracket.
Remove coupling hub and key (031).
4. Remove inlet capscrews (004), inlet head (002) and gasket (009) or O-ring (070 or 075) as applicable.
5.
(Figures 3, 7 and 8)
Remove thrust cage (029). Remove oil balance tube (026) with O-rings (027)
from either thrust cage (029) or rotor housing (024). Remove O-rings (027) from oil balance tube (026).
6.
(Figures 3, 7 and 8)
Remove idler balance piston housings (023) from idler rotors (021), and remove
idler rotors (021) by unscrewing idlers from rotor housings (024).
7.
(Figures 9)
Remove bolts (029 or 053) with lockwashers (030 or 052). Remove thrust plate (026 or
029) and spacers (023 or 051). Remove spacer (040 or 050) from case (001).
8.
(Figures 9)
Remove idler rotors (021) from housing (024) bores by unscrewing idler rotors from
threads of power rotor.
9.
Remove bolts (047 or 017) and bearing retainer (043 or 016).
10. Remove power rotor (044 or 063) assembly from case (001).
NOTE:
Removal of power rotor (044 or 063) will also remove Truarc rings (042), ball bearing (049),
spacer (048 or 014), sleeve (037 or 038) if applicable and mechanical seal (025).
NOTE:
Balance piston furnished as part of power rotor (044 or 063) and is not serviced separately.
11. Remove gasket from bore of inboard cover (046 or 008).
12. Remove inboard cover capscrews (004) and inboard cover (046 or 008) from case (001).
NOTE:
Removal of inboard cover (046) may include removal of O-ring (028) and bushing (086).
Bushing (086) is locked to inboard cover (046) with Loctite retaining compound and should not
be removed unless replacement is necessary.
13. Remove gasket (009) from case (001).
