4
NOTE:
If round gear housing (3) will not slide easily off shaft (6) and this is the last round housing (3) to be
removed, clamp round housing (3) in a vise with front cover (1) free. With a soft headed hammer, tap
alternately on mounting ears of front cover (1) to separate it from round housing (3). When there is
sufficient gap between front cover (1) and round housing (3), insert a wedging device. Pry gap until round
housing (3) is free to slide off shaft (6). If there are several round housings (3) to remove, clamp pump in
a vise leaving rearmost round housing (3) free. Position a wedging device between the rearmost round
housings (3) the round housing (3) in front of it. Pry gap until rearmost round housing (3) is free to slide off
shaft (6).
CAUTION
ATTENTION
Take care not to damage either faces that are being pried against or 0-ring (41) with prying
device.
CAUTION
ATTENTION
If gear housing (3) did not slide off easily because its bushing (53) was jammed on shaft
(6), ball bearing (31) was most likely damaged when housing (3) was pried off and it must
be replaced. Alternately, if gear housing (3) will not slide off easily because its rabbet was
jammed in counter bore of barrel (8) or front cover (1), whichever is applicable, ball
bearing (31) may not have to be replaced.
NOTE:
If housing (3), ring gear (12) or pinion gear (11) cannot be removed without applying excessive force;
pump should be returned to Imo for further disassembly and inspection.
CAUTION
ATTENTION
Be sure that all gear keys (13) are removed before removing shaft (6). If not, front cover
(1) face will be damaged.
CAUTION
ATTENTION
Handle ‘shaft/bearing housing’ assembly with great care since any significant cocking of
bearing housing (9) assembly relative to shaft (6) could damage ball bearing (31) or
mechanical seal (51). If shaft (6) is to be set down on a work surface, it should not be
allowed to rest on bearing housing.
8. Repeat steps 6 and 7 until all round housings (3) are removed.
9. Remove O-ring (41) from front cover (1 if it did not come off with last housing removed.
10. Remove socket head cap screws (75) and bearing retainer (70) with lip seal (32), where applicable.
11. If lip seal (32) is included in the bearing retainer (70) and is to be replaced, remove it from the bearing retainer (70)
and discard.
12. Remove socket head cap screws (42).
13. Reinstall bearing retainer (70) and socket head cap screws (75).
14. Remove shaft (6) from front cover (1). Bearing housing (9), seal spacer (74), ball bearing (31), bearing retainer plate
(70), cap screws (75) and O-rings (40, 80) will come off with shaft as an assembly.
CAUTION
ATTENTION
Be sure that all gear keys (13) are removed before removing shaft (6). If not, front cover
(1) face will be damaged.
CAUTION
ATTENTION
Handle ‘shaft/bearing housing’ assembly with great care since any significant cocking of
bearing housing (9) assembly relative to shaft (6) could damage ball bearing (31) or
mechanical seal (51). If shaft (6) is to be set down on a work surface, it should not be
allowed to rest on bearing housing.
