Service manual

4
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) will 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. On the other hand, if gear housing (7) will not slide off easily because its
rabbet was jammed in housing tube (23) or intermediate cover (5) counter bore,
whichever is applicable, ball bearing (31) may not have to be replaced.
NOTE: If housing (7), ring gear (12) or pinion gear (11) cannot be removed without applying excessive force, unit
should be returned to Imo for further disassembly and inspection.
5. Remove O-ring (10) from intermediate flange (5) if it did not come off with last housing removed.
6. Remove capscrews (39) and washers (34). (Washers not used on single stage units.)
7. 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 housing (4).
NOTE: If intermediate flange (5) will not slide easily off shaft (6), insert prying device between intermediate
flange
(5) and square housing (4) and pry apart.
CAUTION
ATTENTION
Take care not to damage either faces that are being pried against or 0-ring (010) with
prying device.
CAUTION
ATTENTION
If intermediate flange (5) will not slide off easily because its sleeve bushing (53) was
seized on shaft (6), ball bearing (31) was most likely damaged and must be replaced.
8. Remove pinion gear (11) and key from shaft (6) and ring gear (12) from front pump square housing (4).
NOTE: If pinion gear (11) will not slide easily off shaft (6), its key (13) is most likely at least partially sheared.
In this case the disassembly cannot be completed in the field without the chance of damaging other
good parts and the unit should be returned to Imo for further disassembly and inspection.
9. Remove square housing (4) from shaft (6). Do not permit dowel pin (37) to drop as square housing (4) is removed.
Remove dowel pin (37) from either square housing (4) or front flange (1), whichever is applicable.
NOTE: If square gear housing (4) will not slide easily off shaft (6), clamp it in a vice with the front cover (1) free.
With a soft-headed hammer, tap on gear end of shaft (6) until there is sufficient gap to insert a wedging
device between the square housing (4) and the front cover (1). Pry the gap until square housing (4) 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 the shaft had to be hammered to remove the square gear housing (4) from the shaft,
the ball bearing (31) was damaged and must be replaced.
NOTE: If square housing (4) cannot be removed without applying excessive force, unit should be returned to Imo
for further disassembly and inspection.