Sonic Air Systems Sonic 150 User manual

L10028_RevK
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Operation and Maintenance Manual
Sonic 150 / 150C
Sonic Air Systems
1050 Beacon Street
Brea, California 92821
Tel: [phone] Fax: [phone]
www.sonicairsystems.com

L10028_RevK
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Table of Contents
1Sonic 150 / Sonic 150C ....................................................................................................................................... 1
1.1 Introduction ..................................................................................................................................................... 1
1.2 Blower Performance ........................................................................................................................................ 1
1.3 Product Profile ................................................................................................................................................ 2
1.4 Typical Applications ....................................................................................................................................... 3
2Initial Inspection................................................................................................................................................. 4
3Safety Instructions ............................................................................................................................................. 5
3.1 Electrical ......................................................................................................................................................... 5
3.2 Mechanical ...................................................................................................................................................... 5
4Installation and Adjustments ............................................................................................................................ 6
4.1 Lifting and Handling ....................................................................................................................................... 6
4.2 Blower Location .............................................................................................................................................. 6
4.3 Belt Installation ............................................................................................................................................... 8
4.4 Blower Head Mounting Adjustment .............................................................................................................. 11
4.5 Retro Kit Installation (Assemble Sonic blower to existing motor) ................................................................ 15
5Electrical Wiring, and Start-Up ...................................................................................................................... 18
5.1 Motor Wiring................................................................................................................................................. 18
6Blower Specifications ....................................................................................................................................... 19
6.1 Blower Specification Sheet ........................................................................................................................... 19
6.2 Assembly Drawing ........................................................................................................................................ 20
6.3 Parts List ........................................................................................................................................................ 21
6.4 Motor Reference ............................................................................................................................................ 28
6.5 Pulley / Belt Cross Reference ........................................................................................................................ 28
7Periodic Maintenance ...................................................................................................................................... 29
7.1 Maintenance Schedule ................................................................................................................................... 29
7.2 Torque Specifications .................................................................................................................................... 29
7.3 Belt Replacement Procedure ......................................................................................................................... 29
7.4 Belt Tensioner Service .................................................................................................................................. 32
7.5 Bearing Cartridge Replacement Procedure ................................................................................................... 36
7.6 Required Tools .............................................................................................................................................. 37
7.7 Bearing Cartridge Replacement Procedure ................................................................................................... 37
7.8 Recommended Spares ................................................................................................................................... 41
8Troubleshooting ............................................................................................................................................... 42
9Performance Guarantee .................................................................................................................................. 43
10 Warranty Policy ............................................................................................................................................... 44
11 24/7/365 Service Program ................................................................................................................................ 45
12 Sonic Repair Policy .......................................................................................................................................... 46

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Table of Figures
Figure 1 - Sonic 150 ...................................................................................................................................................... 1
Figure 2 - Sonic 150C .................................................................................................................................................... 1
Figure 3 - Sonic Nameplate ........................................................................................................................................... 4
Figure 4 – Blower Serial Number .................................................................................................................................. 4
Figure 5 - Blower Lifting Point...................................................................................................................................... 6
Figure 6 - Remove Belt Guard ....................................................................................................................................... 9
Figure 7 - Install Belt ..................................................................................................................................................... 9
Figure 8 – Verify Belt Gap ............................................................................................................................................ 9
Figure 9 - Loosen Bracket Bolts .................................................................................................................................... 9
Figure 10 – Adjust Belt Gap to ¾” .............................................................................................................................. 10
Figure 11 - Blower Rotations ....................................................................................................................................... 11
Figure 12 - Remove Belt Guard ................................................................................................................................... 13
Figure 13 - Remove Belt .............................................................................................................................................. 13
Figure 14 - Remove Motor Pulley ............................................................................................................................... 13
Figure 15 - Remove Bracket Hardware ....................................................................................................................... 13
Figure 16 - Rotate Bracket ........................................................................................................................................... 14
Figure 17 - Install Bracket Hardware ........................................................................................................................... 14
Figure 18 - Remove Blower Hardware ........................................................................................................................ 14
Figure 19 - Move Water-Cooling Plugs ....................................................................................................................... 14
Figure 20 - Reinstall Blower Head .............................................................................................................................. 14
Figure 21 - Reinstall Belt ............................................................................................................................................. 14
Figure 22 - Adjust Belt Gap to 3/4" ............................................................................................................................. 14
Figure 23 - Final Position ............................................................................................................................................ 14
Figure 24 - Install Uni-mounts ..................................................................................................................................... 16
Figure 25 - Mount Bracket to Motor ........................................................................................................................... 16
Figure 26 - Prepare Bushing ........................................................................................................................................ 16
Figure 27 - Install Bushing .......................................................................................................................................... 16
Figure 28 – Install Bushing Hardware ......................................................................................................................... 16
Figure 29 - Bushing Installation................................................................................................................................... 16
Figure 30 – Install Set Screw ....................................................................................................................................... 16
Figure 31 - Install Motor Pulley................................................................................................................................... 17
Figure 32 - Install Belt ................................................................................................................................................. 17
Figure 33 - Set Belt Gap to ¾” .................................................................................................................................... 17
Figure 34 - Check Alignment ....................................................................................................................................... 17
Figure 35 - Motor Rotation Sticker .............................................................................................................................. 18
Figure 36 - Remove Belt Guard ................................................................................................................................... 30
Figure 37 - Remove Existing Belt ................................................................................................................................ 30
Figure 38 - Install New Belt......................................................................................................................................... 31
Figure 39 – Verify Belt Gap ........................................................................................................................................ 31
Figure 40 - Loosen Bracket Hardware ......................................................................................................................... 31
Figure 41 - Adjust Belt Gap to ¾” ............................................................................................................................... 31
Figure 42 - Remove Belt Guard ................................................................................................................................... 33
Figure 43 - Remove Belt .............................................................................................................................................. 33
Figure 44 - Remove Motor Pulley ............................................................................................................................... 33
Figure 45 - Remove Bolt ............................................................................................................................................. 33
Figure 46 - Remove Belt Tensioner ............................................................................................................................. 34
Figure 47 - Caution Loose Springs .............................................................................................................................. 34
Figure 48 - Correct Position ........................................................................................................................................ 34
Figure 49 - Verify Belt Gap ......................................................................................................................................... 34
Figure 50 - Loosen Bracket Hardware ......................................................................................................................... 35
Figure 51 - Adjust Belt Gap to 3/4" ............................................................................................................................. 35
Figure 52 - Remove Belt Guard ................................................................................................................................... 38
Figure 53 - Remove Belt .............................................................................................................................................. 38

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Figure 54 – Remove Water Cooling Tubing ................................................................................................................ 38
Figure 55 – Remove Filter or Inlet Screen ................................................................................................................... 38
Figure 56 – Remove Cover .......................................................................................................................................... 39
Figure 57 – Remove Impeller ...................................................................................................................................... 39
Figure 58 – Remove Blower Pulley ............................................................................................................................. 39
Figure 59 – Remove Thermocouple ............................................................................................................................ 39
Figure 60 – Remove Compression Fitting ................................................................................................................... 40
Figure 61 – Remove Bearing Cartridge Hardware....................................................................................................... 40
Figure 62 – Remove Bearing Cartridge ....................................................................................................................... 40
Figure 63 – Blower w/ Bearing Cartridge Removed .................................................................................................... 40

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1Sonic 150 / Sonic 150C
Figure 1 - Sonic 150
Figure 2 - Sonic 150C
1.1 Introduction
Thank you for the recent purchase of a Sonic 150 or Sonic 150C centrifugal blower or
retro-kit. Sonic Air Systems is confident that the blower unit is the best available in this
performance range. Sonic manufactures blowers using the finest components available,
assembles using only highly trained and qualified personnel, and inspects each unit 100%
for quality and performance.
The following manual is intended to:
 Identify safety hazards
 Familiarize personnel with the equipment performance
 Demonstrate typical installation and usage
 Identify maintenance schedule and typical spare components
 Provide Sonics’ Performance Guarantee and Warranty information
1.2 Blower Performance
 The Sonic 150 series blower is a single stage centrifugal blower and has been designed in
accordance with fan engineering laws. Horsepower demand increases in proportion to
increased air volume (motor amperage draw increases). As the air volume decreases
(valve closes or filter clogs), the amp draw decreases. Always check a fully installed
system to ensure that the motor is not overloaded.

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 Sonic air blowers have some of the largest turndown ratios of any blower in their
performance range. At 10:1, a Sonic 150’s range is from 120 cfm 57 (lps) to 1,200 cfm
(566 lps) without overheating or surging. Outside of those ranges the air surging is mild
and continuous operation may shorten the bearing life.
 The blower inlet must also be hose coupled to an inlet filter-silencer, inlet air safety
screen or piped to a delivery system. Sonic inlet filter-silencers should be used in every
application where the inlet air is not piped directly to the blower inlet. Sonic standard
filters are rated at 2 microns with a paper element or 5 microns with a polyester element.
Inlet air temperature must not exceed 125°F (52°C) unless a Sonic 150C water-cooled
unit is used. If the blower is in an enclosed space and the inlet air is piped from another
area, make sure that the ambient temperature around the blower / motor does not exceed
110°F (43°C). When air is re-circulated from an air knife zone, in-line filters and water
separators must be used to prevent water from entering the blower.
 The blower outlet must always be hose coupled to a discharge silencer, system piping, or
otherwise directed away from personnel. Discharged air should be silenced to levels as
required by applicable occupational safety standards or corporate standards as applicable.
In order to minimize pressure drop and noise transmission, Sonic recommends using
smooth bore tubing (hard plastic or metal).
 Flex hose can induce a large pressure drop and should only be used when absolutely
necessary. Flex hose should be rated to handle a pressure of 10 psig (0.7 bar) at 200°F
(93°C). Flex hose can be used for connecting misaligned piping and bend radii that do
not match standard elbows. Be aware that flex hose can collapse inside and should be
inspected if flow problems occur. Short rubber sleeves with band clamps are standard for
blower and piping connections.
 Sonic butterfly valves have a wafer design that is designed to regulate flow, but will not
seal when closed. Air will always leak around the wafer to help minimize blower
cavitations.
 The Patent Pending Sonic Belt Tensioner is used to maintain a constant low tension on
the drive belt and reduces the maintenance schedule for the blower unit. Belt life is
optimized and belt replacement typically takes only 5 to 10 minutes to perform.
 Typical blower noise is approximately 80db to 95db. Sonic Blower Acoustical
Enclosures can be used to reduce blower noise to within 75 db to 85 db depending on the
blower model. Additional noise reduction is available; contact Sonic for details.
1.3 Product Profile
The Sonic 150 blower with the Sonic Automatic Belt Tensioning assembly requires no
periodic belt adjustment. The blower shaft and impeller assembly is supported by two
duplex pair (4 bearings) ABEC 9 permanently greased packed bearings. With operating
speeds of 11,000 to 20,000 RPM, a single Sonic 150 head assembly can be powered by a
15 to 25 horsepower (11.2 to 18.6 kW) motor. The inter-connecting support bracket

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joining the blower and motor has a belt guard completely enclosing the drive assembly
and completing this integral design.
With air / gas delivery up to 1,200 CFM (566 lps), this unit is well suited for any
application with pressures to 4.5 psi (0.31 bar). As a result of the high-speed operation,
the total envelope of the blower / motor assembly is one of the most compact and
lightweight within its performance range.
1.4 Typical Applications
The following is a list of typical applications for using a Sonic 150 centrifugal blower
assembly. This is only a partial list of the possible uses for supplying low cost, clean air
to a particular application. Please consult a Sonic Application engineer to design a
system to meet any request.
Parts drying
Engine exhaust sampling
Hydrocarbon vapor recovery
Environmental test chambers
Gas boosting
Tank / Pond aeration
Concrete grinding vacuum
Gas meter testing
Cooling
Vacuum hold down
Oil spill containment booms
Air bearings
Special applications and options are available for the Sonic 150 blower unit:
Corrosion resistant electroplating
Air flow control valves
316 Stainless Steel Material Option
Acoustical enclosure
Welded inlet and outlet flanges
In-Line filters and water separators
Water cooling of the bearing housing
Filter Silencers
Operation to 400°F inlet air temperature
Explosion Proof motors
Thermocouple monitoring of bearings
Wash Down duty motors
Discharge silencers
Premium Efficiency (PE) motors
IEC motor compatibility
Hydraulic motors
Sonic also provides a full line of air / gas handling accessories:
Complete drying systems
Air wipe collars
Air blowers from 3 to 50 horsepower
HEPA filters to 1,000 CFM
High efficiency aluminum air knives
Acoustical enclosures
High efficiency stainless steel air knives
Piping accessories
Sonic services four main industries:
Food and Beverage
Wire and Cable
Electronics
Metal and Sheet Fabricators
Please contact a local Sonic representative or a Sonic application engineer to discuss any special
considerations or applications.

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2Initial Inspection
Upon receipt of your Sonic Air Centrifugal Blower, make sure that all components listed on
the packing slip are present. Check to see that the serial number on the blower housing
matches the packing slip (See Figure 4). Inspect the blower / motor to ensure that they are
mounted with the correct outlet position and that the motor is the correct horsepower,
voltage and enclosure. If you have any shortages, discrepancies, or shipping damage, please
call your Sonic Distributor or Sonic Air Systems immediately.
Figure 3 - Sonic Nameplate
The serial number of the blower identifies the blower model, pulley size, belt size, mounting
position, and the motor specifications. Please use this number for any correspondence with
the Sales / Customer Service Department at Sonic Air Systems.
Blower Serial Number
Figure 4 – Blower Serial Number
Sonic Nameplate
Sonic Serial
Number
Identification
Grooves

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3Safety Instructions
3.1 Electrical
 Always use qualified electrical and mechanical personnel for installation and maintenance
of Sonic air blowers.
 No work should be performed on a Sonic air blower until the power has been turned off
and an isolation device has been applied. Disconnect the electrical power at the motor
starter, fuse box, or circuit breaker before working on the blower / motor. Double check
to be sure that the power is off and that it cannot be turned on while you are working on
the blower / motor assembly.
 Use proper electrical installation, wiring, and controls consistent with local and national
electrical codes. A lockable isolation switch should be provided.
 Refer to the motor nameplate data for the proper power supply requirements. Be sure the
junction box connections are tight and well insulated to prevent shorts and to assure
maximum protection against moisture.
3.2 Mechanical
 Never run the Sonic air blower without the belt guard installed.
 Never run the Sonic air blower with the outlet open to atmosphere as this can cause the
motor to overload.
 Never run the Sonic air blower with the inlet open to atmosphere. Always connect your
system piping, Sonic inlet filter, or Sonic Inlet safety screen to the blower inlet to prevent
personal injury or damage to the blower.
 Keep tools, clothing and hands away from rotating or moving parts while the unit is
running.
 Use safety glasses when working around the blower / motor and / or air knife assembly
while the system is running.
 Always use proper lifting techniques and equipment.
 Observe good safety habits at all times and use care to avoid injury to personnel and
damage to the equipment.

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4Installation and Adjustments
The following steps and procedures detail the installation and setup of a typical blower
assembly. Disassembly of a blower unit is the opposite of the assembly procedure.
4.1 Lifting and Handling
Due to the weight of the blower / motor assembly, it should be lifted by a hoist or forklift
using the single eyebolt on the top middle of the motor (See Figure 5). See Section 6.1 -
Component Specification Sheet for weight and dimension details.
Figure 5 - Blower Lifting Point
4.2 Blower Location
4.2.1 Access
Make certain to allow room for proper ventilation and accessibility to remove the
belt guard for belt replacement as well as filter servicing. Never block the
ventilation holes in the belt guard. Mount the blower / motor assembly in a well
ventilated area to prevent motor overheating and premature belt and / or blower
head failure.

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4.2.2 Temperature
The blower / motor assembly must be placed in an area that prevents hard freezes
or overheating. Ambient temperature conditions should range from a low of
+10°F (-12°C) to +110°F (43°C). The blower / motor assembly is suitable for
outdoor locations, but care should be taken to protect the equipment from
temperature extremes, direct exposure to the sun, rain, snow, and dust so as to
extend the service life of the blower, motor, and filter.
The blower / motor assembly, while running, can increase the ambient
temperature above 110°F (43°C). Always check the running ambient temperature
and do not operate above 110° (43°C).
4.2.3 Moisture and Debris
Sonic air blowers have a high-speed belt drive, close tolerance components and
precision bearings. Do not put the blower where it will be sprayed from a
washing / rinsing zone, from over-spray from an air knife or where dust, dirt, or
other debris will attack the drive belt or clog the filter. If the filter needs cleaning
or replacing more than one time each month, the blower or filter should be moved
to a cleaner, dryer area. A Sonic acoustical blower enclosure will also ensure safe
operation.
4.2.4 Wash Down
In factory locations subject to high-pressure water or caustic wash down cycles,
the blower / motor unit must be protected or relocated to prevent damage. Raising
the blower 1-2 feet (0.3 to 0.6 meters) above the wash zone is recommended.
Wash down duty motors and corrosive resistant blower coatings are available to
allow full exposure should it be needed.
4.2.5 Explosive Environments
The Sonic 150 centrifugal blower is made from non-sparking aluminum and
therefore is suitable for explosive gases and explosive environments. Special
explosion proof motors can also be included for hazardous duty.
4.2.6 Corrosive Environments
The Sonic 150 blower can be protected with special coatings for protection in
corrosive environments. Protection level and life of blower is dependent on the
type of chemical and the concentration level.
4.2.7 Vibration
Due to the low vibration level of the Sonic air blowers, they can be bolted to any
type of foundation or framework without transmitting any significant vibration.
Sonic provides four rubber isolation mounts on most assemblies to prevent other
equipment vibration from damaging the blower bearings.
4.2.8 Water Cooling Circuit
If the inlet air / gas is piped directly to the blower inlet, and the temperature is
over 125°F (52°C), a water-cooled blower head must be used to protect the shaft

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bearings. The exact water temperature and flow required in the cooling circuit
will vary with each blower configuration and application. Although water
demand for the blower head varies, the common design point in all applications is
that the water exiting from the cooling circuit should never exceed 100°F (38°C).
Typical water demand will range from ¼ to ¾ gallons per minute (1 to 3 liters per
minute) if using tap water (approximately 65°F (18°C)) and will be significantly
lower if chilled water is used.
4.2.9 Thermocouple Option
All Sonic 150 blower heads can be ordered with a thermocouple option. The
thermocouple is in direct contact with the shaft bearing and continuously monitors
the temperature of the bearing. Continuous monitoring of the blower head bearing
temperature can indicate an imminent bearing failure (See Section 12 for Sonics’
repair policy). Predicting and anticipating a bearing failure may save costly
equipment and / or line down time.
4.3 Belt Installation
Sonic ships all new systems with the drive belt removed. This is to assure that the
electrical starter, soft start and wiring is correct before the blower is started. See Section
5.1 for motor wiring instructions and verify that the wiring and blower rotation is correct
before installation of the drive belt.
4.3.1 Tools Required
Description
Qty.
Description
Qty.
1/2 inch socket
1
#3 Drive Extension
1
9/16 inch box-end wrench
1
¾ inch deep socket (optional)
1
3/8 inch ratchet driver
1
Rubber Mallet (optional)
1
4.3.2 Belt Installation Procedure
1. Remove the belt guard using the 1/2 inch socket. (See Figure 6)
2. Using the 9/16 inch box-end wrench, rotate the belt tensioner arm counter
clockwise (CCW). At the same time wrap the belt around the blower pulley, then
along the right side of the idler pulley, and finally around the motor pulley. (See
Figure 7)
3. Slowly rotate the motor pulley to make sure the belt is seated in the grooves.
4. Verify that the belt gap is approximately ¾ inch ±1/16 inch (Factory Set). (See
Figure 8)
5. If a ¾ inch belt gap was not achieved, use a ¾ inch deep socket to loosen the
bracket mounting screws behind the motor pulley and slide the bracket. (See
Figure 9 and Figure 10)
6. Using the 1/2 inch socket, reinstall the belt guard.

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Figure 6 - Remove Belt Guard
Figure 7 - Install Belt
Figure 8 – Verify Belt Gap
Figure 9 - Loosen Bracket Bolts

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Figure 10 – Adjust Belt Gap to ¾”

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4.4 Blower Head Mounting Adjustment
The blower head position was adjusted at the factory to the application specifications.
Therefore, it should not be necessary to change the position of the blower head outlet
unless the application specifications have changed or the unit is relocated. See Figure 11
for blower head rotation options. Use the following procedure to modify or adjust the
blower head rotation.
Figure 11 - Blower Rotations
4.4.1 Required Tools
Description
Qty.
Description
Qty.
3/8 inch ratchet driver
1
Rubber mallet
1
¾ inch deep socket
1
1/2 inch socket
1
¼ inch allen socket
1
9/16 inch box-end wrench
1
242 Loctite
1
5/16 inch allen socket
1
#3 Drive Extension
1
4.4.2 Blower Head Adjustment Procedure
1. Remove the belt guard using the 1/2 inch socket. (See Figure 12)
2. Disconnect the water-cooling lines at the quick disconnect on the blower head. (If
Applicable)
3. Using the 9/16 inch box-end wrench, rotate the belt tensioner arm counter
clockwise (CCW) and remove the belt. (See Figure 13)
Note: If rotating the blower bracket, follow Steps 4 thru 8. If only rotating the blower
head, skip to Step 7.
4. Use the ¾ inch deep socket to hold the motor pulley in place. Using the 5/16 inch
allen socket, remove the motor pulley screws and motor pulley. (See Figure 14)
5. Using the ¾ inch deep socket, remove the four bracket bolts and washers located
behind the motor pulley. (See Figure 15)
6. Rotate the bracket to the desired position and reinstall the bracket bolts and
washers. Tighten only one bolt temporarily for belt adjustment. (See Figure 16
and Figure 17)

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7. Using the ¼ inch allen socket, remove the eight screws from the bracket that
secure the blower head. (See Figure 18)
8. Remove the water-cooling plugs from the blower head and rotate as necessary.
(See Figure 19) (If Applicable)
9. Rotate the blower head to desired rotation and reinstall the eight screws to the
proper torque specifications. (See Section 7.2 - Torque Specifications) (See Figure
20)
10. Using the 5/16 allen socket and the 242 Loctite, reinstall the motor pulley.
11. Using the 9/16 inch box-end wrench, rotate the belt tensioner arm counter
clockwise (CCW). At the same time wrap the belt around the blower pulley, then
along the right side of the idler pulley, and finally around the motor pulley. (See
Figure 21)
12. Slowly rotate the motor pulley to make sure the belt is seated in the grooves.
13. Verify that the belt gap is approximately ¾ inch ±1/16 inch. If a ¾ inch belt gap
was not achieved, use a ¾ inch deep socket to loosen the bracket mounting screws
behind the motor pulley and slide the bracket. (See Figure 22 and Figure 23)
14. Using a ¾ deep socket, verify that the bracket bolts behind the motor pulley are
secure. (See Section 7.2 - Torque Specifications)
15. Reinstall the water-cooling lines. (If Applicable)
16. Using the 1/2 inch socket, reinstall the belt guard.

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Figure 12 - Remove Belt Guard
Figure 13 - Remove Belt
Figure 14 - Remove Motor Pulley
Figure 15 - Remove Bracket Hardware

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Figure 16 - Rotate Bracket
Figure 17 - Install Bracket Hardware
Figure 18 - Remove Blower Hardware
Figure 19 - Move Water-Cooling Plugs
Figure 20 - Reinstall Blower Head
Figure 21 - Reinstall Belt
Figure 22 - Adjust Belt Gap to 3/4"
Figure 23 - Final Position

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4.5 Retro Kit Installation (Assemble Sonic blower to existing motor)
4.5.1 Tools Required
Description
Qty.
Description
Qty.
3/8 inch ratchet driver
1
9/16 inch box-end wrench
1
¾ inch deep socket
1
1/2 inch socket
1
9/16 inch open-end wrench
1
¼ inch flat head screwdriver
1
5/16 inch allen socket
1
Rubber mallet
1
Calipers
1
24 inch Straight edge
1
242 Loctite
1
7/32 inch allen wrench
#3 Drive Extension
1
4.5.2 Retro Kit Installation
1. Using a 9/16 inch open-end wrench, mount the vibration isolators and uni-mounts
to the motor. (See Figure 24)
2. Mount the bracket assembly to the motor and then tighten only one screw using
the ¾ inch socket temporarily for belt gap adjustment. (See Figure 25)
3. Using a flat head screwdriver and a rubber mallet, wedge the screwdriver into the
front face of the bushing (Do not wedge in flange area) and then slide it onto the
motor shaft. (See Figure 26)
4. Set the bushing to 1.266 ± .005 (32.2 mm) from the bushing flange to the bracket
reference surface and remove the screwdriver. Using the 5/16 inch allen socket
and 242 Loctite, install the two bushing screws. Tighten the screws to the
specified torque, over tightening may damage the bushing. (See Figure 27, Figure
28, Figure 29, and Figure 30)(See Section 7.2 - Torque Specifications)
5. Tighten the bushing set screw using the 7/32 inch allen wrench.
6. Before installing the motor pulley, double check the bushing setting and then
install the pulley and the three pulley screws using 242 Loctite and the 5/16 inch
allen socket. Tighten the three pulley screws to the required torque specifications.
(See Figure 31)(See Section 7.2 - Torque Specifications)
7. Using the 9/16 inch box-end wrench, rotate the belt tensioner arm counter
clockwise (CCW). At the same time wrap the belt around the blower pulley, then
along the right side of the idler pulley, and finally around the motor pulley. (See
Figure 32)
8. Slowly rotate the motor pulley to make sure the belt is seated in the grooves.
9. Using the rubber mallet, adjust the belt gap to ¾ inch ±1/16 inch. (See Figure 33)
10. Using the ¾ inch deep socket, tighten the bracket hardware. (See Section 7.2 -
Torque Specifications)
11. Using a straight edge, check the pulley alignment from the face of the motor
pulley to the face on the blower pulley. Verify that there is no gap and the
alignment must be within ±1/32 inch. (See Figure 34)
12. Using the 1/2 inch socket, install the belt guard.

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Figure 24 - Install Uni-mounts
Figure 25 - Mount Bracket to Motor
Figure 26 - Prepare Bushing
Figure 27 - Install Bushing
Figure 28 – Install Bushing Hardware
Figure 29 - Bushing Installation
Figure 30 – Install Set Screw