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77
Wheel Drive Motor and Pulley Replacement
(62M170-095 Units)
1. Disconnect power to wheel drive motor.
2. Remove belt from pulley and position temporarily around
wheel rim.
3. Loosen setscrew in wheel drive pulley using Allen
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 shown in Fig. 90 and secure
setscrew to drive shaft.
7. Stretch belt over pulley and engage in groove.
Belt Replacement
1. Obtain access to the pulley side bearing access plate.
Remove two bearing access plate retaining screws and
the access plate.
2. Using hexagonal wrench, loosen setscrew 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.
NOTE: Slight hand pressure against wheel rim will
lift weight of wheel from inner race of bearing to assist
bearing removal and installation. If not removable by
hand, use bearing puller.
4. Using a wrench, remove diameter seal retaining screws or
hub seal retaining screws. Remove diameter seals or hub
seal from bearing beam. See Fig. 91.
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. 91 shows 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
bearing support beam. Secure the bearing with two
self-locking nuts.
7. Install the belts around the wheel and pulley according to
the instructions provided with the belt.
8. Reinstall diameter seals or hub seal and tighten retaining
screws. Rotate wheel in clockwise direction to determine
that wheel rotates freely with slight drag on seals.
9. Reinstall bearing locking collar. Rotate collar by hand in
the direction the wheel rotates (see label provided on each
cassette for wheel rotation). Lock in position by tapping
drift pin hole with hammer and drift. Secure in position
by tightening setscrew.
10. Reinstall bearing access cover.
11. Apply power to wheel and ensure that the wheel rotates
freely without interference.
ALTERNATE BELT REPLACEMENT METHODS — Alter-
nate belt replacement methods may be used in some applica-
tions depending upon accessibility of the cassette. Consult
instructions provided with the belt for further information.
Protect hands and belt from possible sharp edges of hole in
bearing support beam.
Wheel
Drive
Motor
Insulation
Seal
Plate
Pulley
Dimension A
Fig. 90 — Pulley Location
62M
UNIT SIZE
ERV
WHEEL
WHEEL
SERIES
DIMENSION A
(in.)
170 ERC-3623 36
1
/
4
225 ERC-3623 36
285 ERC-3628 36
330 ERC-5245 52
430 ERC-5245 52
550 ERC-5262 52
640 ERC-5262 52
750 ERC-6488 64
7
/
16
950 ERC-6488 64
NOTE: The ERV wheel model number contains the wheel series number,
and is located on a label near the drive pulley. For example, ERC-5245D is
a 52 series wheel.
Imbedded Stiffeners
CATCH
PULL TAB
Fig. 88 — Motor Side View of Segment
Fig. 89— Latch Segment Retaining Brackets