Sleeve Bearing Replacement - Carrier 40UV Installation, Start-Up And Service Instructions Manual

Sleeve Bearing Replacement (40UV050-125,
40UH075-125 and
(Fig. 44) —
Refer to Fig. 40 for 40UH200 units only,
Fig. 41 for 40UV050-150 and 40UH075-125 units with PSC
motors, Fig. 42 for 40UV050-125 and 40UH075-150 units
with ECM motors.
Lock out and tag all power supplies to equipment and con-
trols prior to servicing unit. Follow all safety codes. Failure
to do so could result in personal injury.
The assembly order of the bearing installation is critical. Be
careful with all components during removal and installa-
tion. Any excessive force applied to these components can
cause unintended damage and void unit warranty.
To replace ball bearing:
1. Turn off all power to unit.
IMPORTANT: Tag each right front panel (40UV) or
middle bottom panel (40UH) for each unit. Panels have
electrical information specific to each unit.
2. Use 5 / in. hex (Allen) tool or
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front (40UV) or bottom (40UH) panels and right (motor
end) end panel.
1
3. Remove / in. head screws (Item 5 in Fig. 37) along
4
length of unit that secure coil baffle to blower section and
remove front coil baffle.
4. Remove left blower section end (Item 2 in Fig. 44) insu-
lation (Item 1 in Fig. 44).
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5. Use / in. socket to remove hex nuts (Fig. 40, Item 13;
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Fig. 41, Item 8; Fig. 42, Item 9) securing end bearing
bracket (Fig. 40, Item 12; Fig. 41, Item 7; Fig. 42, Item 8)
to blower section end.
6. Remove bearing bracket assembly (Fig. 40, Items 12, 14,
13, 11; Fig. 41, Items 7, 10, 9, 11; Fig. 42, Items 8, 11, 10,
12) from blower section end. Use care to slide assembly
40UH200 Units Only)
3 / in. nut driver to remove
8
off of shaft end. Hold shaft from inside blower section
to prevent wheel damage.
7. Use 1 / in. socket and
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remove hex nuts (Fig. 40, Item 13; Fig. 41, Item 9;
Fig. 42, Item 10) and bolts (Fig. 40, Item 11; Fig. 41, Item
11; Fig. 42, Item 12) holding bearing (Fig. 40, Item 14;
Fig. 41, Item 10; Fig. 42, Item 11) and bearing bracket
(Fig. 40, Item 12; Fig. 41, Item 7; Fig. 42, Item 8)
together.
Ensure sleeve bearing is installed with oil cup facing
upwards as shown in left side view.
8. Replace bearing (Fig. 40, Item 14; Fig. 41, Item 10;
Fig. 42, Item 11). Attach to bearing bracket using hex
nuts and bolts. Align oil cup port with matching cutout in
bearing bracket.
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9. Use / in. socket to slide replacement bearing (Fig. 40,
16
Item 14; Fig. 41, Item 10; Fig. 42, Item 11) on to the end
of shaft and install bearing bracket assembly (Fig. 40,
Items 12, 14, 13, 11; Fig. 41, Items 7, 10, 9, 11; Fig. 42,
Items 8, 11, 10, 12) in blower section end. Attach using
hex nuts.
10. Add 5 to 10 drops of SAE 20 or 30 non-detergent based
oil to bearing.
11. Rotate the fan shaft by hand to ensure that fans are
unrestricted and can rotate freely. Check for any fan
obstructions.
12. Reinstall left blower section end insulation (Item 1 in
Fig. 44).
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13. Reinstall / in. head screws (Item 5 in Fig. 37) along
4
length of unit securing coil baffle to the blower section.
14. Reinstall front (40UV) or bottom (40UH) panels. Rein-
stall end panels. Ensure that tag on each right front
panel (40UV) or middle bottom panel (40UH) match-
es unit tag.
15. Restore power to unit.
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1 / in. combination wrench to
2