42
6. To remove the key, use a rubber mallet or brass bar
to drive the shaft and wheel in one direction. Drive
the key in the opposite direction using a nail set or
smaller size key stock until the key is completely
free of the wheel. Be sure the key does not get
bent by allowing it to ride up the key way edge.
The slightest bend will prevent quick assembly.
Should it occur, replace the key stock.
7. Remove the shaft, supporting the weight of the
wheel. Do not allow the weight of the wheel to
be supported by only one bearing during the disas-
sembly process.
8. Remove the wheel through the side of the unit.
9. Reassembly in reverse order, centering the wheel
over the inlet cone. If bearings were removed or
replaced, be sure to reuse any shim stock found
between the mounting support / plate and bearing
housings.
10. Torque all hardware.
11. Reassemble the Control / Blower section to the
Compressor / Condenser section.
Disconnect and lock-out power from
the unit anytime service is being per-
formed on the fan section. Failure to
do so could result in serious injury or
death due to the fan turning on while
work is in progress.
Fan Motor
1. Shut off unit power and lock out.
2. Disconnect and tag power wires at motor
terminals.
3. Loosen motor brace-to-mounting-rail attaching
bolts.
4. Mark belt as to position. Remove and set aside
belts.
5. Remove motor bracket hold down bolts.
6. Remove motor pulley and set aside.
7. Remove motor.
8. Install new motor. Reassemble by reversing steps
1 – 6. Be sure to reinstall multiple belts in their
original position. Use a complete new set if re-
quired. Do not stretch belts over sheaves. Review
the sections on motor and sheave installation,
sheave alignment, and belt tensioning discussed
previously.
9. Reconnect motor leads and restore power. Check
fan for proper rotation as described in Start-Up
Check List.
Fan Shaft Bearings
General –
When removing and replacing the bearings,
care should be taken to ensure that the area where the
bearings fit on the shaft does not become scored or
damaged. The shaft in this area should be thoroughly
cleaned before the bearing is removed and again before
the new bearing is installed.
Mounting Details
1. Check the shaft – it should be straight, free of burrs
and full size. Be sure the bearing is not seated on
a worn section of shafting.
2. Make certain any set screws are not obstructing
the bearing bore.
3. Align the bearing in its housing and slide the bear-
ing into position on shaft – never hammer the ends
of the inner race. If necessary, use a brass bar or
pipe against the inner race to drift bearing into
place – never hit the housing, as bearing damage
may result. Make sure there is lubricant between
the bearing outer ring and the housing.
4. Fasten the bearing housing to the unit mounting
support with hex head cap screws, washers, new
lock washers and hex nuts before securing the bear-
ing to the shaft. This permits the bearing to align
itself in position along the shaft and eliminates any
possibility of cramping loads.
5. Rotate the shaft to make certain it turns freely.
6. Bearings may employ one of several different
methods to lock the bearing to the shaft.
Shaft should be free from burrs. If old
shaft is used, be sure a ball bearing is
not seated on worn section and shaft
is not bent.
Maintenance
JOHNSON CONTROLS
FORM 145.05-NOM1 (708)
Summary of Contents for York VERSECON YSWD 012
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