6
NOTE:
Neither housing tube (8) nor O-ring (41) need be removed from round housing (3) unless O-ring (41) is to
be replaced.
16. Repeat steps 13, 14 and 15 until all round housings (3) are removed.
CAUTION
ATTENTION
In next step, ring gear (12), pinion (11) and key (13) will be removed. If ring (12) and
pinion (11) 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 (13) is to be reused, mark it so that it can be assembled
into its original stage and facing its original direction.
17. Remove pinion gear (11) and key (13) 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 change of damaging other
good parts and the unit should be returned to Imo for further disassembly and inspection.
18. 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 (2), whichever is applicable.
NOTE:
If square gear housing (4) will not slide easily off shaft (6), clamp it in a vice with the front flange (2) 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 flange (2). 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 (10) 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) can not be removed without applying excessive force, unit should be returned toImo
for further disassembly and inspection.
19. Remove capscrews (42) from seal housing (9).
20. Remove shaft (6) from front flange (2). Removal of shaft also removes seal housing (9), outside lip seals (32), ball
bearing (31), and bearing retaining ring (33).
21. Remove seal housing (9), with lip seals (32), from shaft (6).
22. If lip seals (32) are to be replaced, remove them from seal housing (9) and discard.
23. If ball bearing (31) is to be replaced, remove snap ring (33) from shaft (6), press ball bearing (31) off shaft (6)
and discard.
24. If inside lip seal (51) is to be replaced remove and discard lip seal (51).
H. INSPECTION OF PARTS
1. BALL BEARING – Ball bearings should be free turning and quiet. Their grease should have a soft
consistency and not look or smell burned.
