Wheel Drive Motor And Pulley; Solid Belt Replacement (Fig. 189); Link Belt Replacement - Carrier Aero 39MN Series Installation, Start-Up And Service Instructions Manual

WHEEL DRIVE MOTOR AND PULLEY REPLACEMENT
1. Disconnect power to the wheel drive motor.
2. Remove the belt from the pulley and position it temporar-
ily around the wheel rim.
3. Loosen the set screw in the wheel drive pulley using an
Allen wrench and remove the pulley from the motor drive
shaft.
4. While supporting the drive motor's weight in one hand,
loosen and remove the four mounting bolts.
5. Install the replacement motor using the hardware kit
supplied.
6. Install the pulley as shown in Fig. 188 and secure the set
screw to the drive shaft.
7. Stretch the belt over the pulley and engage it in the
groove.
8. Follow the start-up procedure on page 198.

SOLID BELT REPLACEMENT (FIG. 189)

1. Obtain access to the pulley side bearing access plate.
Bearing access plates are not provided on 25 to 36-in. cas-
settes. Remove the two bearing access plate retaining
screws and the access plate.
2. Using a hex wrench, loosen the set screw in the bearing
locking collar. Using a light hammer and drift (in drift pin
hole), tap the collar in the direction of wheel rotation to
unlock the collar. Remove the collar.
3. Using a socket wrench with extension, remove the two
nuts that secure the bearing housing to the bearing sup-
port beam. Slide the bearing from the shaft.
Note: Slight hand pressure against wheel rim will lift the
wheel's weight from the inner race of the bearing to assist bear-
ing removal and installation. If not removable by hand, use a
bearing puller.
4. Using a wrench, remove the diameter seal retaining
screws (25 to 68-in. cassettes). Remove diameter seals
(25 to 68-in. cassettes) from the bearing beam.
CAUTION
Protect hands and belt from possible sharp edges of hole in
bearing support beam.
5. Form a small loop of belt and pass it through the hole in
the bearing support beam. Grasp the belt at the wheel hub
and pull the entire belt down. Loop the trailing end of the
belt over the shaft (Fig. 189 shows the solid belt partially
through the opening).
6. Reinstall the bearing onto the wheel shaft, being careful
to engage the two locating pins into the holes in the bear-
ing support beam. Secure the bearing with the two self-
locking nuts.
7. Install the belts around the wheel and pulley according to
the instructions provided with the belt.
8. Reinstall the diameter seals and tighten the retaining
screws (see Adjusting Air Seals on page 205 for seal ad-
justment). Rotate the wheel clockwise to determine that it
rotates freely with slight drag on the seals.
9. Reinstall the bearing locking collar. Rotate the collar by
hand in the direction the wheel rotates (see label provided
on each cassette for wheel rotation). Lock the collar in po-
sition by tapping the drift pin hole with a hammer and
drift. Secure in position by tightening the set screw.
10. Reinstall the bearing access cover.
11. Apply power to the wheel motor and ensure that the
wheel rotates freely without interference.
Fig. 188 — Pulley Location
LOCKING
COLLAR
LOCKING
NUTS (2)
BEARING
ACCESS PLATE BEARING
HOUSING
SET
SCREW
DRIFT PIN
HOLE
LOCATING PIN
FEED
BELT
Fig. 189 — Solid Belt Replacement

LINK BELT REPLACEMENT

Before performing service or maintenance operations on unit,
turn off main power switch to unit. Electrical shock could
cause personal injury.
1. Confirm the model number on the replacement belt kit
matches the model number on the energy recovery cas-
sette label.
2. Remove any remnant of old belt from cassette.
3. At location near pulley, attach the hook end of belt to
wheel rim with tape, making sure that narrow side of "V"
belt is positioned against rim and link is covered by the
tape (see Fig. 190).
4. Rotate the wheel clockwise while feeding belt onto wheel
rim (be careful not to twist belt) until taped end returns to
pulley location. Remove tape from wheel.
5. Link belt ends together with belt wrapped around wheel
(Fig. 191).
6. Rotate wheel clockwise to position connector approxi-
mately 180 degrees from pulley location.
206
BELT (SHOWN
IN PLACE)
BEARING
WHEEL RIM
SUPPORT
BEAM
WHEEL
HUB (2)
TAPER-LOCK
HUB COLLAR (2)
SHAFT
PULL
PULLEY
MOTOR
a39-2387
SIDE
SIDE
WARNING