Service manual

4
NOTE: If square gear housing (62) will not slide easily off shaft (6), clamp housing (7) in a vise with housing
(62) free. Insert Prying device between the two housings and pry gap until housing (62) is free to slide
off shaft (6). Remove and discard O-ring (40), if it did not come off with square housing (62).
CAUTION
ATTENTION
Take care not to damage either faces that are being pried against or 0-ring (10) with
prying
device.
CAUTION
ATTENTION
If gear housing (62) did not slide off easily because its bushing (82) was seized on
shaft
(6), ball bearing (31) was most likely damaged when housing (62) was pried off, and must
be replaced. If housing (62) did not slide off easily because it was stuck in housing
tube
(23), ball bearing (31) may not have to be replaced.
NOTE: If square housing (62) cannot be removed without applying excessive force, unit should be returned to
Imo for further disassembly and inspection.
7. Remove housing tube (23) if it was damaged and needs to be replaced.
CAUTION
ATTENTION
In next step, ring gear (20), pinion (19) and key (21) will be removed. If ring (20) and
pinion (19) are to be reused, identify them, with a marker or the like, so it can be
determined to which housing they belong (if there is more than one housing in
pump) and which direction face of each gear was positioned in housing. Do not mark
with scribe or punch as this may leave a burr or high spot which could lead to pump
damage or seizure. If key (21) is to be reused, mark it so that it can be assembled
into its original stage and facing its original direction.
8. Remove capscrews (39).
9. Remove square gear housing (7), ring gear (20), pinion gear (19) and key (21) from shaft (6). Do not permit
dowel pin (37) to drop as housing (7) is removed. Remove dowel pin (37) from either housing (7) or
intermediate flange (5), whichever is applicable.
CAUTION
ATTENTION
If square gear housing (7) will not slide easily off shaft (6), clamp intermediate flange
(5) in a vice with square of housing free (7). Insert prying device between
intermediate flange (5) and square housing (7). Pry gap until square housing (7) is
free to slide off shaft
CAUTION
ATTENTION
Take care not to damage either faces that are being pried against or 0-ring (10) with
prying device.
CAUTION
ATTENTION
If gear housing (7) did not slide off easily because its bushing (53) was seized on shaft
(6), ball bearing (31) was most likely damaged when housing (7) was pried off, and
must be replaced. If housing (7) did not slide off easily because it was stuck in
intermediate cover (5) counter-bore, ball bearing (31) may not have to be replaced.
NOTE: If housing, ring gear or pinion gear cannot be removed without applying excessive force, unit should be
returned to Imo for further disassembly and inspection.
10. Remove O-ring (41) from intermediate flange (5) if it did not come off with last housing removed.
11. Remove intermediate flange (5) from shaft (6). Do not permit dowel pin (37) to drop as intermediate flange
(5) is removed. Remove dowel pin (37) from square of housing (4) or intermediate flange (5) whichever is
applicable.