IMO *G3D-250 - Page 11

11
Close off suction and discharge piping to pump and disconnect piping. If applicable, remove tubing (042,
Figure 20) with check value (039). (Must be reinstalled in original installed position.) Remove drain plugs and
drain unit. Remove pump from driver, coupling and mounting bracket. Remove coupling hub and key (016).
1. Remove capscrews (010) or bolts (010) with lockwashers (030), if applicable, and remove inlet head
(026) from case (001).
NOTE: If no inlet head is used, (Figure 26, Arrangement C) remove clamp ring (026).
2. Remove gasket (008) from case (001) or O-ring (008) from inlet head (026).
3. Remove bolts (023) or jam nuts (047) from studs (023) and lockwashers (024).
4. Remove thrust plate (021) and spacers (022). If installed, remove 0-rings (046) from studs (023,
Figure21).
5. Remove idler cups (020), where applicable.*
6. Remove idlers (019) by unscrewing idlers from housing (002) idler bores.
CAUTION
ATTENTION
Do not permit idlers (019) to drop as they emerge from housing (002).
7. Remove bolts (018) and bearing retainer (017).
8. Pull assembled power rotor (011) from case (001). NOTE: Removal of assembled power rotor (011)
includes removal of truarc rings (013), ball bearings (015) and spacer (014). If installed, mechanical seal
(025) and truarc ring (035) will also be removed with assembled power rotor (011).
9. On pumps equipped with mechanical seal (025), remove gasket or O-ring from mechanical seal bore of
cover (009).
10. Remove capscrews (010, 003 or 031) or bolts (010 or 003) and remove inboard cover (009) from case
(001).
11. (Figures 18 through 21) Remove O-ring (007) from inboard cover (009)
NOTE: If installed, lockwashers (030) will be removed with bolts (010).
12. Remove tube (004) with O-rings (005) and spacer (027) from either inboard cover (009) or housing (002).
NOTE: Spacer (027) not installed on rotor size 312 pumps.
13. Remove O-rings (005) from tube (004). Remove O-rings (007) from case (001).
14. Remove housing (002) with O-ring (006) from inlet end of case (001). Remove O-ring (006) from housing
(002).
15. Disassembly power rotor (011) as follows
(a) Remove outer truarc ring (013).
(b) Using a bearing puller or press, remove ball bearing (015).
(c) Remove inner truarc ring (013).
(d) Remove spacer (014).