Instructions / Assembly

Installation Instructions for
SM670 Series Utility Motors
Read before beginning installation.
Important: Disconnect electrical supply source to prevent electrical shock
670 Utility motors have 3/16” diameter shafts and are single speed 120V. 60 Hz.
672 Utility motors have 3/16” diameter shafts and are single speed 240V. 50/60 Hz.
673 Utility motors have 3/16” diameter shafts and are two speed 120V. 60 Hz.
The SM670, SM672 & SM673 motor kits contain the following components:
(All other kits contain miscellaneous hardware or include the motor only).
REMOVAL:
Standard skeleton frame motors and round motors.
1. Remove grill or guard to expose inoperative motor.
2. Disconnect motor lead wires. Cut wires if wired direct. Unplug if motor has a connector or plug.
3. Remove defective motor from mounting. NOTE... On many exhaust hoods the motor bracket is
mounted with two (2) screws which only need be loosened and motor and bracket can be turned a
few degrees and lifted off mounting.
4. Remove old bracket and save to install on new motor.
5. Carefully remove fan blade from defective motor. CAUTION: Do not bend or break original blade if it
is to be reused.
INSTALLATION:
SKELETON FRAME MOTORS.
1. Determine the rotation of the defective motor (Fig. B)
2. The new utility motor is furnished with clockwise rotating facing shaft.
3. To reverse the rotation remove the bolts holding the front and rear bearing brackets. Remove the
front bearing bracket, lift shaft and rotor out and reverse. (Make sure front and rear thrust washers
remain on the shaft as originally supplied.) Place bracket with mounting bosses and screw extension
on the side
required. Insert front of shaft and rotor through original rear bearing bracket and over rear of shaft.
Reassemble bolts through bearing brackets and stator.
4. Install utility motor to original bracket.
5. If applicable, install the original fan blade. If necessary, use the 1/4” or 5/16” shaft adapters
furnished in the package, or select the clockwise or counter clockwise fan blades provided in the kit.
SEALED UNIT PARTS CO., INC.
P.O. Box 21, 2230 Landmark Place, Allenwood, N.J. 08720
www.supco.com • [e-mail]
1 - Utility motor
1 - 5.5 counterclockwise fan blade
3 - wire nuts
6 - 6-32 small pattern hex nuts
2 - 6-32 x 2 1/2” R.H. screws
1 - 1/4” shaft bushing
1 - fan adapter
If shaft adapters are used, insert into the fan blade bore first, then install this assembly onto the
motor shaft.
6. Install the utility motor with the original bracket back onto mountings and secure.
7. Properly route motor lead wires to clear blade and shaft and plug into power outlet or splice wires
using wire nuts furnished in kit.
INSTALLATION:
ROUND STYLE MOTOR - 2 7/8” MOUNT
1. Use motor mounting bracket furnished in kit to extend replacement motor mounting from 1 7/8” to 2
7/8”. Secure bracket to SM670 utility motor (either front or rear of motor as required - Fig. A), and
reinstall to original mounting bracket. NOTE: The motor mounting bracket must be installed using the
bearing bracket with out mounting bosses. If necessary this bracket may be moved from the rear to
the front of the motor by removing the (2) bolts that hold together the bearing bracket.
2. Properly route lead wires to clear blade and shaft and plug into power outlet or splice wires using
wire nuts furnished in kit.
Wiring: Two speed SM670 Series Motors
1. White lead - motor common
Red lead- motor low speed
Black lead-motor high speed
2. The two speed motor can be used as a single speed using common (white) and either red or black lead for desired
speed. NOTE: Tape unused lead for electrical safety.
1 - instruction sheet
1 - 4” clockwise fan blade
6 - 8-32 hex nuts
2 - 6-32 x 7/8” R.H. screws
2 - 8-32 x 1 1/4” screws
1 - 5/16” shaft bushing
1 - motor mounting bracket
Dual Voltage 120 / 240
Volt Wiring