12.
(Figure 4)
Remove retaining ring (008).
13. Remove power rotor (019 or 063). Removal of power rotor (019 or 063) will also remove balance piston
housing (022) with O-ring (028) and oil balance tube (026).
NOTE:
Balance piston (020) furnished as part of power rotor (019 or 063) and is not serviced separately.
14. Remove balance piston housing (022) from power rotor (019 or 063). Remove O-ring (028) and oil
balance tube (026) from balance piston housing (022).
15.
(Figure 4)
Remove O-ring (027) from oil balance tube (026), and remove relief valve (032 from balance
piston housing (022).
16. Remove stop pin (006) with Dyna seal (007) from case (001).
17. Remove rotor housing (024) with O-ring (028) and oil balance tube (026) from suction end of pump case
(001.
18. Remove O-ring (028) and oil balance tube (026) from rotor housing (024). Remove O-rings (027) form
grooves of oil balance tube (026).
Assembly Procedures (Figures 4 through 6)
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 Division recommends automatic replacement of O-rings
(027 and 028), gaskets (009), Dyna seal (007) and packing (017) when these parts are disturbed
from their previously installed position. Refer to pump assembly drawings, Figures 8, 9 and 10, and
List of Material, Table 3, during pump assembly. Coat all parts with light lubricating oil to assist in
assembly. Assembly procedures for Figures 8 through 10 are identical unless specifically noted.
1. Install O-ring (028) in groove of rotor housing (024), and install rotor housing (024) in suction end of
pump case (001), ensuring that bore in rotor housing (024) is aligned with stop pin (006) bore of pump
case (001).
2. Install stop in (006) with Dyna seal (007) in pump case (001) and rotor housing (024).
3 Install O-rings (027) in grooves of oil balance tube (026) and install oil balance tube (026) in bore of
suction end of rotor housing (024).
4. Install O-ring (028) in groove of balance piston housing (022), and install balance piston housing (022)
on power rotor (019 or 063) shaft.
5.
(Figure 4)
Install relief valve (032) in balance piston housing (022). Install O-rings (027) in grooves of oil
balance tube (026).
6. Install oil balance tube (026) in bore of balance piston housing (022).
7. Install power rotor (019 or 063) assembly in bore case (001), ensuring that oil balance tube (026)
engages bore of rotor housing (024).
8.
(Figure 4)
Install retaining ring (008) in groove of case (001).
9. Install retainer plate (010) using capscrews (011).
10.
(Figures 5 and 8)
Install spacer (090).
