Inspection; Reassembly - Carrier 16JT Series Start Up & Operation Manual

3. Open the motor wiring terminal box (Item 11) and dis-
connect the motor power leads. Mark the leads to en-
sure proper reassembly.
4. Remove nuts (Item 21) holding motor adapter flange to
pump casing (Item 23). With the larger motors which
have a hanger support, disconnect the hanger. Place match-
ing orientation marks on the two flanges.
NOTE: Use blocking to support the weight of the motor
before moving it and before removing hanger support.
5. If pump has a circulation pipe (Item 1) connected to the
pump discharge pipe, disconnect the circulation pipe at
this time.
6. Use jack screw to loosen motor from pump casing. Pull
motor straight back from pump casing until impeller
(Item 25) has cleared the housing.
7. Remove and discard casing flange gasket (Item 22).
8. Straighten locking tabs on impeller locking washer
(Item 30), and remove locking screw (Item 31). Prevent
impeller from rotating while removing the locking screw.
9. Remove impeller with impeller/gear puller. Remove shaft
key (Item 32).
10. Remove bolts (Item 24) for motor wear ring housing
(Item 33), and, using one bolt as a jack screw, carefully
loosen the wear ring housing from the motor adapter flange.
Place matching orientation marks on the two pieces. Pull
the wear ring housing straight back from the motor while
supporting the impeller shaft (Item 17), being careful to
not damage the bearings or the stator and rotor cans
(Items 14 and 15).
11. Remove the impeller end radial and thrust bearings
(Items 34 and 35), and mark them for both location and
direction (i.e., which end of the bearing faces the im-
peller end of the motor).
12. While continuing to support the impeller shaft, pull the
rotor (Item 16) straight out of the rotor cavity, being care-
ful to not damage the bearings or the stator and rotor
cans.
13. Remove the bolts (Items 3 and 40) from the circulating
pipe connecting flange(s), if not previously done, to dis-
connect the pipe from the end of the motor.
14. Remove and discard O-rings (Items 2 and 39).
15. Remove the bolts (Item 4) on the motor end cover
(Item 5) and use one as a jacking screw to loosen the
end cover from the motor end flange. Place matching
orientation marks on the two pieces. Remove the cover.
16. Remove the motor end radial and thrust bearings
(Items 7 and 8), and mark them for both location and
direction (i.e., which end of the bearing faces the im-
peller end of the motor).
17. NOTE: Remove and discard motor end cover gasket
(Item 6).
NOTE: Do not remove the plug (Item 18) on the top of the
motor (Item 12) except when leak testing or drying the mo-
tor windings.

INSPECTION

1. Check circulation passages in motor and circulating pipe.
Clean if necessary.
2. Inspect rotor and stator cans for scratches, rubbing, or punc-
tures. Severe damage will require motor replacement.
3. Inspect the radial bearing cavities in the motor end cover
and wear ring housing. If the internal surface is rough or
worn more than the maximum diameter in Table 9, re-
place the part.
Table 9 — Maximum Radial Bearing Cavity
MOTOR SIZE
kW
1.5
3.7
5.5
7.5
4. Inspect the radial and thrust bearings. If the surface is
very rough or deeply scratched, or if worn to a thickness
less than listed in Table 10, replace the bearing. The thrust
bearing on the impeller end normally receives the great-
est wear.
Table 10 — Minimum Bearing Thickness
MOTOR SIZE
kW
1.5
3.7
5.5
7.5
38
Measurement
MAX. DIAMETER (D)
in.
1.27
1.51
1.98
1.98
Measurement
MIN. RADIAL MIN. THRUST
THICKNESS (T1) THICKNESS (T2)
in. mm in.
0.13 3.3 0.18
0.15 3.8 0.18
0.19 4.8 0.22
0.19 4.8 0.22
mm
32.3
38.3
50.3
50.3
mm
4.6
4.6
5.6
5.6