53
Polymer Wheel Air Seals
Four adjustable diameter seals are provided
on each cassette to minimize transfer of air
between the counter flowing airstreams.
To adjust diameter seals, loosen diameter seal
adjusting screws and back seals away from
wheel surface. Rotate wheel clockwise until
two opposing spokes are hidden behind the
bearing support beam. Using a folded piece
of paper as a feeler gauge, position paper
between the wheel surface and diameter
seals.
Adjust seals towards wheel surface until a
slight friction on the feeler gauge (paper) is
detected when gauge is moved along the
length of the spoke. Retighten adjusting
screws and recheck clearance with “feeler”
gauge.
Polymer Wheel Drive Components
The wheel drive motor bearings are pre-
lubricated and no further lubrication is
necessary.
The wheel drive pulley is secured to the drive
motor shaft by a combination of either a key
or D slot and set screw.
The set screw is secured with removable
locktite to prevent loosening. Annually
confirm set screw is secure. The wheel drive
belt is a urethane stretch belt designed to
provide constant tension through the life of
the belt. No adjustment is required. Inspect
the drive belt annually for proper tracking
and tension. A properly tensioned belt will
turn the wheel immediately after power is
applied with no visible slippage during start-
up.
Polymer Wheel Drive Motor and Pulley
Replacement
1. Disconnect power to wheel drive
motor.
2. Remove belt from pulley and position
temporarily around wheel rim.
3. Loosen set screw in wheel drive pulley
using a hex head wrench and remove
pulley from motor drive shaft.
4. While supporting weight of drive motor
in one hand, loosen and remove (4)
mounting bolts.
5. Install replacement motor with
hardware kit supplied.
6. Install pulley to dimension as shown
and secure set screw to drive shaft.
7. Stretch belt over pulley and engage in
groove.
8. Follow start-up procedure.
Polymer Wheel Belt Replacement
1. Obtain access to the pulley side bearing
access plate if bearing access plates are
provided. Remove two bearing access
plate retaining screws and the access
plate.
2. Using hexagonal wrench, loosen set
screw in bearing locking collar. Using
light hammer and drift (in drift pin
hole) tap collar in the direction of wheel
rotation to unlock collar. Remove
collar.
3. Using socket wrench with extension,
remove two nuts which secure bearing
housing to the bearing support beam.
Slide bearing from shaft. If not
removable by hand, use bearing puller.
4. 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.
Note: Slight hand pressure against wheel rim
will lift weight of wheel from inner race of
bearing to assist bearing removal and
installation.
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