Sterling ERMS - Manual (Page 19)

7
Wheel Drive Motor & Pulley Replacement
1. Dis connec t power to wheel drive motor.
2. Remove belt from pulley and position
temporari ly around wheel rim.
3. Loosen set screw in wheel drive pulley using
allen wrench and remov e pulley from motor
drive shaft.
4. W hile supporting wei ght of dri ve motor in one
hand, loosen and remove (4) mounti ng bo lts.
5. Install replacement motor with hardware kit
supplied.
6. Install pulley to dimension shown in (Figure 6)
and secure set s crew to drive shaft.
7. Stretch belt over pulley and engage in groove.
8. Follow start-up proc edure on page 4.
Figure 6 Pulley Location
3. Using s ocket wrench with extension, remove two
nuts which secure bearing housing to the bearing
support beam. Sli de bearing from shaft.
Note: Slight hand pressure against wheel rim
will lift weight of wheel from inner race of
bearing to assist bearing remov al and in stall
tion. If not removable by hand, use bearing
puller.
4. Using a wrench, remove diameter seal retaining
screws (Series 36 through 74) or hub seal retain
ing s crews (Series 86). Remov e diameter seals
(Series 36 through 74) or hub seal (Seri es 86)
from bearing bea m (see Fi g. 9, 10 & 11).
5. Form a small loop of belt and pas s i t through the
hole in the bearing support beam. Gras p the belt
at the wheel hub and pull the entire belt down.
Loop the trailing end of the belt over the shaft
(Fig. 8 & 9 shows belt partially through the
opening).
6. Reinstall the bearing onto the wheel shaft, being
careful to engage the two locati ng pins into the
holes i n the bearing support beam. Secure the
bearing with two self locking nuts.
7. Install the belts around the wheel and pulley ac
cording to the instructions provided with the belt.
8. Reinstall diameter seals or hub seal and tighten
retai ning screws (see page 5 for seal adjustme nt).
Rotate wheel in clockwise directi on to determine
that wheel rotates freely with slight drag on seals.
9. Rei nstall bearing locking collar. Rotate collar by
hand in t he direction the wheel rotates (see label
provided on each cassette for wheel rotation).
Lock in pos ition by tappi ng drift pin hole with ham
mer and dri ft. Secure in position by tightening set
s crew.
10. Reinstall Bearing Acces s Cover.
11. Apply power to wheel and ens ure that the wheel
rotates freely without interference.
Belt Replacement (See Figure 7)
1. Obtain access to the pulley side bearing access
plate. Bearing access plates are not provided on
Series 36 c assettes. Remove two bearing access
plate retaining screws and the access plate.
2 Us ing hexagonal wrench, loosen set screw in
bearing locking collar. Using li ght hammer and
drift (in drift pin hole) tap c ollar i n the direction of
wheel rotation to unlock collar. Remove collar.
CAUTION
Protect hands and belt from possible sharp
edges of hole in Bearing Support Beam.
A
Wheel
Drive
Motor
Seal
Plate
Insulation
Pulley
SERIES DIM A
36 1/4”
52 1/4”
64 7/16”
74 7/16”
86 7/16”
Slowly rotate the wheel 180º. Install the second
segment opposite the first for counterbalance.
Rotate the two installed segments 90º to balance the
wheel while the third segment is installed.
Rotate the wheel 180º again to install the fourth
segment opposite the third. Repeat this sequence
with the remaining four segments
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