Western PRO-FLO 300W Operating instructions

This document supersedes all editions with an earlier date.
September 1, 2021
Lit. No. 43755, Rev. 05
PRO‑FLO™ 300W & PRO‑FLO™ 300H
Tailgate Spreaders
#30850, 30860
Owner's Manual and Installation Instructions
Original Instructions
This manual is for WESTERN®PRO‑FLO™ 300W & PRO‑FLO™ 300H tailgate spreaders with
serial numbers beginning with 150401 and higher.
CAUTION
Read this manual before installing or
operating the spreader.
Western Products, PO Box 245038, Milwaukee, WI 53224‑9538 • www.westernplows.com

Lit. No. 43755/43757, Rev. 05 3 September 1, 2021
TABLE OF CONTENTS
INTRODUCTION ....................................................... 5
Owner's Information Form .................................... 5
SAFETY ..................................................................... 6
LOADING ................................................................. 11
Certication......................................................... 11
Approximate Material Weights............................ 11
MOUNTING THE SPREADER............................... 12
Assembly Instructions......................................... 12
Receiver Mount Spreader................................... 13
ELECTRICAL DIAGRAM....................................... 14
OPERATING THE SPREADER ............................. 16
Driving and Spreading on Snow and Ice ............ 16
Ensuring that the Spreader has Power............... 18
Starting and Stopping Motor............................... 18
Spreading Tips.................................................... 18
REMOVING THE SPREADER............................... 19
WIRELESS CONTROL PROGRAMMING AND
PAIRING ............................................................... 20
MAINTENANCE ......................................................22
Lubrication ..........................................................22
After Each Use....................................................22
At the End of Each Season or
After Extended Storage ................................... 22
Fuse Replacement..............................................22
Storage ...............................................................22
TROUBLESHOOTING............................................ 23

Lit. No. 43755, Rev. 05 5 September 1, 2021
INTRODUCTION
This manual has been prepared to acquaint you with
the safety information, operation, and maintenance of
your new tailgate spreader. Please read this manual
carefully and follow all recommendations. This will
help ensure protable and trouble-free operation of
your spreader. Keep this manual accessible. It is a
handy reference in case minor service is required.
When service is necessary, bring your spreader to
your distributor. They know your spreader best and are
interested in your complete satisfaction.
NOTE: This spreader is designed to spread snow
and ice control materials only. Do not use it
for purposes other than those specied in this
manual.
Register your spreader online at www.westernplows.com
OWNER'S INFORMATION
Owner's Name: ______________________________________________________________________
Date Purchased: _____________________________________________________________________
Distributor Name: __________________________________________ Phone:_________________
Distributor Address:___________________________________________________________________
Vehicle Model:_____________________________________________ Year: __________________
Spreader Model: _________________________ Serial #:__________________________________
Spreader Weight:_____________________lb/kg

Lit. No. 43755/43757, Rev. 05 6 September 1, 2021
SAFETY DEFINITIONS
NOTE: Indicates a situation or action that can lead
to damage to your spreader and vehicle or other
property. Other useful information can also be
described.
SAFETY
WARNING/CAUTION LABELS
Please become familiar with the warning and caution
labels on the spreader.
NOTE: If labels are missing or cannot be read, see
your sales outlet.
CAUTION
Indicates a potentially hazardous situation
that, if not avoided, may result in minor or
moderate injury. It may also be used to alert
against unsafe practices.
WARNING
Indicates a potentially hazardous situation
that, if not avoided, could result in death or
serious personal injury.

Lit. No. 43755/43757, Rev. 05 7 September 1, 2021
SAFETY
SERIAL NUMBER LABEL
Code Denition
YY 2‑Digit Year
MM 2‑Digit Month
DD 2‑Digit Day
LL 2-Digit Location Code
XXXX 4-Digit Sequential Number
ZZZZZZ Assembly Part Number
Model No. 00000
Serial No. YYMMDDLLXXXXZZZZZZ
Model No. 00000
Serial No. 000000000000000000

Lit. No. 43755/43757, Rev. 05 8 September 1, 2021
CAUTION
Disconnect electric and/or hydraulic power
and tag out if required before servicing or
performing maintenance.
CAUTION
DO NOT leave unused material in
hopper. Material can freeze or solidify,
causing unit to not work properly.
Empty and clean after each use.
NOTE: Lubricate grease ttings after each use.
Use a good quality multipurpose grease.
FUSES
The electrical system may contain several blade-
style automotive fuses. If a problem should occur
and fuse replacement is necessary, the replacement
fuse must be of the same type and amperage rating
as the original. Installing a fuse with a higher rating
can damage the system and could start a re. Fuse
Replacement is located in the Maintenance section of
this Owner's Manual.
SAFETY
SAFETY PRECAUTIONS
Improper installation and operation could cause
personal injury and/or equipment and property
damage. Read and understand labels and the
Owner's Manual before installing, operating, or making
adjustments.
WARNING
• Driver to keep bystanders minimum of
25 feet away from operating spreader.
• Before working with the spreader, secure all
loose-tting clothing and unrestrained hair.
• Before operating the spreader, verify that all
safety guards are in place.
• Before servicing the spreader, wait for
auger and spinner to stop.
• Do not climb into or ride on spreader.
WARNING
Overloading could result in an
accident or damage. Do not exceed
GVWR or GAWR ratings as found on
the driver‑side door cornerpost of
the vehicle. See Loading section to determine
maximum volumes of spreading material.
CAUTION
If rear directional, CHMSL light, or brake
stoplights are obstructed by the spreader,
the lights shall be relocated, or auxiliary
directional or brake stoplights shall be
installed.
CAUTION
During the hopper spreader installation
we recommend the addition of an OSHA
compliant Backup Alarm. This alarm is
required for OSHA governed employers.
CAUTION
• Do not operate a spreader in need of
maintenance.
• Before operating the spreader, reassemble
any parts or hardware removed for cleaning
or adjusting.
• Before operating the spreader, remove
materials such as cleaning rags, brushes,
and hand tools from the spreader.
• While operating the spreader, use auxiliary
warning lights, except when prohibited by law.
• Tighten all fasteners according to the
Torque Chart. Refer to Torque Chart for the
recommended torque values.
WARNING
Vehicles <10,000 lb GVWR: Obstructing
the visibility from the vehicle's rear camera
could result in serious injury or damage. An
auxiliary camera system shall be installed
if the vehicle's rear camera is removed or
blocked.

Lit. No. 43755/43757, Rev. 05 9 September 1, 2021
VENTILATION
BATTERY SAFETY
FIRE AND EXPLOSION
Be careful when using gasoline. Do not use gasoline
to clean parts. Store only in approved containers away
from sources of heat or ame.
CELL PHONES
A driver's rst responsibility is the safe operation of
the vehicle. The most important thing you can do
to prevent a crash is to avoid distractions and pay
attention to the road. Wait until it is safe to operate
mobile communication equipment such as cell phones,
text messaging devices, pagers, or two-way radios.
CAUTION
Batteries normally produce explosive gases
which can cause personal injury. Therefore,
do not allow ames, sparks, or lit tobacco
to come near the battery. When charging or
working near a battery, always cover your
face and protect your eyes, and also provide
ventilation.
• Batteries contain sulfuric acid which burns
skin, eyes, and clothing.
• Disconnect the battery before removing or
replacing any electrical components.
WARNING
Vehicle exhaust contains lethal fumes.
Breathing these fumes, even in low
concentrations, can cause death. Never
operate a vehicle in an enclosed area without
venting exhaust to the outside.
WARNING
Gasoline is highly ammable and gasoline
vapor is explosive. Never smoke while
working on vehicle. Keep all open ames
away from gasoline tank and lines. Wipe up
any spilled gasoline immediately.
SAFETY
PERSONAL SAFETY
• Remove ignition key and put the vehicle in PARK
or in gear to prevent others from starting the
vehicle during installation or service.
• Wear only snug-tting clothing while working on
your vehicle or spreader.
• Do not wear jewelry or a necktie, and secure long
hair.
• Wear safety goggles to protect your eyes from
battery acid, gasoline, dirt, and dust.
• Avoid touching hot surfaces such as the engine,
radiator, hoses, and exhaust pipes.
• Always have a re extinguisher rated BC handy,
for ammable liquids and electrical res.

Lit. No. 43755/43757, Rev. 05 10 September 1, 2021
CAUTION
Read instructions before assembling.
Fasteners should be nger tight until
instructed to tighten according to torque
chart. Use standard methods and practices
when attaching spreader including proper
personal protective safety equipment.
TORQUE CHART
1/4-20 10
91
54
1/4-28 12
11
71
5/16-1
81
50 212
5/16-2
41
70 240
3/8-16 269 376
3/8-24 29
74
20
7/16-1442
96
06
7/16-20
9/16-12
9/16-18
5/8-11
5/8-18
3/4-10
3/4-16
7/8-9
7/8-14 47
46
69
64
49
091-8
1-12 70
49
95
1/2-13
1/2-20
11.9
13.7
24.6
27.3
43.6
26.9
53.3
93
148
49.4
69.8
77.9
106.4
120.0
8.4
9.7
17.4
19.2
30.8
35.0
49.4
55.2
75.3
85.0
M6 x 1.00
M12 x 1.75
M8 x 1.25
M14 x 2.00
M10 x 1.50
M27 x 3.00
M22 x 2.50
M30 x 3.50
M24 x 3.00
M20 x 2.5011.1
19.5
38.5
67
107
7.7
613
778
1139
1545
450
428
562
796
1117
M33 x 3.50
M36 x 4.00
2101
2701
1468
1952
325
M16 x 2.00 231167
M18 x 2.50 318222
Recommended Fastener Torque Chart
Size Size
Torque (ft-lb)
Grade
5
Grade
8
Metric Fasteners Class 8.8 and 10.9
These torque values apply to fasteners
except those noted in the instructions.
Torque (ft-lb)
Grade
5
Grade
8
Size Size
Torque (ft-lb)
Class
8.8
Class
10.9
Torque (ft-lb)
Class
8.8
Class
10.9
Inch Fasteners Grade 5 and Grade 8
NOISE
Airborne noise emission during use is below 70 dB(A)
for the spreader operator.
VIBRATION
Operating snowplow vibration does not exceed
2.5 m/s2to the hand‑arm or 0.5 m/s2to the whole
body.
SAFETY

Lit. No. 43755/43757, Rev. 05 11 September 1, 2021
APPROXIMATE MATERIAL WEIGHTS
Material Density
(lb/ft3)
Rock Salt (Dry) 80–90
Weight of spreader and mount must be added to
struck material weight to determine total spreader
weight. Do not exceed maximum material capacity
as shown on the safety label (see Safety section).
Use only bagged rock salt with the spreader.
Other forms of spreading material are not
compatible with the tailgate spreader.
NOTE: If spreader and ice control material loading
is in doubt, weigh vehicle for compliance with
vehicle ratings.
LOADING
This manual covers vehicles which have been
recommended for carrying the spreader. Please see
your local dealer for proper vehicle applications.
CERTIFICATION
WARNING
Overloading could result in an accident or
damage. Do not exceed GVWR or GAWR
as found on the driver‑side cornerpost of
vehicle.
WARNING
New untitled vehicle installation of a spreader
requires National Highway Tra󰀩c Safety
Administration altered vehicle certication
labeling. Installer to verify that struck load of
snow or ice control material does not exceed
GVWR or GAWR rating label and complies
with FMVSS.
CAUTION
Read and adhere to manufacturer's
ice‑control material package
labeling including Material Safety
Data Sheet requirements.
WARNING
Do not overload vehicle. Use chart below
to calculate weight of material. Weights of
material are an average for dry materials.
CAUTION
Never use wet materials or materials with
foreign debris with any of these spreaders.
These units are designed to handle dry, clean,
free-owing material.

Lit. No. 43755/43757, Rev. 05 12 September 1, 2021
ASSEMBLY INSTRUCTIONS
The spreader shall be installed according to
instructions supplied. Your local outlet is trained to
provide this service and service your spreader with
factory original parts.
1. Place the drive assembly on a at, level surface.
Attach the receiver mount to the drive assembly
as shown below using four 1/2" x 1-1/2" cap
screws. Tighten the fasteners according to the
torque chart.
MOUNTING THE SPREADER
2. Mount the support frame to the drive assembly
using the six supplied 5/16" x 1" cap screws and
the four supplied 5/16" locknuts. Tighten the
fasteners according to the torque chart.
3. Mount the throat support to the support frame at
the two lower holes by using the four supplied
5/16" x 1" cap screws and 5/16" locknuts. Tighten
the fasteners according to the torque chart.
5/16" x 1" Cap Screws
Support Frame
5/
16" Locknuts
Drive Assembly
Re
ceiver Mount
1/2" x 1-1/2" Cap Screw
Throat Support
5/16" x 1"
Cap Screws
5/
16"
Locknu
ts
Support Frame

Lit. No. 43755/43757, Rev. 05 13 September 1, 2021
RECEIVER MOUNT SPREADER
The spreader shall be installed according to
instructions supplied. Your local outlet is trained to
provide this service and service your spreader with
factory original parts.
Insert the assembled unit into the receiver hitch and
secure with the supplied hitch pin and hairpin cotter.
MOUNTING THE SPREADER
4. Drill four holes in the hopper using the
support frame holes as a template. Place the
backing plate inside the hopper.
5. Fasten the hopper to the support frame by running
the four supplied 5/16" x 1" cap screws through
the backing plate, hopper, and support frame from
inside the hopper. Attach using the four supplied
5/16" locknuts. Tighten the fasteners according to
the torque chart.
5/16" x 1" Cap Scre
w
5/16"
Locknut
Hopper
Hairpin Cotter
Hitch Pin
Receiver Mount
Receiver Hitch
CAUTION
During removal or mounting, securely grip
spreader to avoid dropping.
CAUTION
Before drilling holes, check to be sure that no
vehicle wiring or other components could be
damaged.

Lit. No. 43755/43757, Rev. 05 14 September 1, 2021
ELECTRICAL DIAGRAM –WIRED CONTROL
Battery
Double Female
Remove jumper for use
with VAR-020 Variable
Speed Control Kit.
ON/OFF
Switch
Rubber
Switch
Boot
Wiring Harness
25A
Breaker
3/8"
Terminal
Ring
Fuse Holder
25A
3" Jumper
ELECTRICAL DIAGRAM: WIRED CONTROL
IMPORTANT: In the o󰀨-season, remove the control
and put in a cool, dry place. The interior summer
temperatures could damage the circuit board and
void the warranty.
Wiring Instructions
1. Install switch at desired location.
2. Run the spreader/vehicle harness from the rear of
the vehicle to the switch area. Attach the female
spade red wire to the switch. Leave the black wire
for Step 5.
3. Route the power harness from the battery to the
switch/control.
4. Attach the red lead to the POSITIVE (+) side of the
battery and the black lead to the NEGATIVE (–)
side of the battery.
5. Attach the female spade red wire on the switch
terminal. Using 3" double female black wire
jumper, attach the black wire from the power
harness to the black wire of the vehicle harness.
6. Install the rubber weatherproof boot on the switch
before nishing the installation.
7. Apply dielectric grease on the terminals of SAE
plug at rear of vehicle.

Lit. No. 43755/43757, Rev. 05 15 September 1, 2021
Wireless Receiver Module Connections
Spreader Power Plug End
Battery NEGATIVE (–)
Battery POSITIVE (+)
Bypass
CommonLearn
Antenna
LEDMotor POSITIVE (+) Motor NEGATIVE (–)
Battery Power POSITIVE (+)
Terminal #4
Black Wire
Battery NEGATIVE (–)
Terminal #1
White Wire
ELECTRICAL DIAGRAM –WIRELESS CONTROL
WIRELESS CONTROL

Lit. No. 43755/43757, Rev. 05 16 September 1, 2021
DRIVING AND SPREADING ON SNOW
AND ICE
Follow your vehicle owner's manual instructions for
driving in snow and ice conditions. Remember, when
you drive on snow or ice, your wheels will not get good
traction. You cannot accelerate as quickly, turning
is more di󰀩cult, and you will need longer braking
distance. Wet and hard packed snow or ice o󰀨er the
worst tire traction. It is very easy to lose control. You
will have di󰀩culty accelerating. If you do get moving,
you may have poor steering and di󰀩cult braking,
which can cause you to slide out of control.
Here are some tips for driving in these conditions:
• Drive defensively.
• Do not drink, then drive or spread ice-control
materials.
• Spread or drive only when you have good visibility
for operating a vehicle.
• If you cannot see well due to snow or icy
conditions, you will need to slow down and keep
more space between you and other vehicles.
• Slow down, especially on higher-speed roads.
Your headlamps can light up only so much road
ahead.
• If you are tired, pull o󰀨 in a safe place and rest.
• The spreader's size and location reduce driver
visibility to the rear of the vehicle. We recommend
an OSHA compliant backup alarm for all governed
employers.
• Keep your windshield and all glass on your vehicle
clean to see around you.
• Dress properly for the weather. Wear layers of
clothing; as you get warm, you can take o󰀨 layers.
OPERATING THE SPREADER
WARNING
Drinking and then driving or spreading is
very dangerous. Your reexes, perceptions,
attentiveness, and judgment can be a󰀨ected
by even a small amount of alcohol. You can
have a serious or even fatal collision if you
drive after drinking. Please do not drink then
drive or spread ice‑control materials.

Lit. No. 43755/43757, Rev. 05 17 September 1, 2021
OPERATING THE SPREADER –WIRED CONTROL
WIRED CONTROL
The tailgate spreader comes standard with an
ON/OFF switch.
To start the spreader: Turn the power ON. Material
will begin to ow through the feed auger.
To stop the spreader: Switch the power OFF.
Material will cease to spread.
NOTE: The truck ignition must be ON to start the
spreader.
NOTE: If truck ignition is turned OFF while
spreader is running, the motor will stop.
NOTE: The spinner motor is not designed for
continuous duty. Allow the motor to cool between
long cycle times.
WARNING
Never operate equipment when under the
inuence of alcohol, drugs, or medications
that might alter your judgment and/or reaction
time.
WARNING
Never allow children to operate or climb on
equipment.
WARNING
Never exceed 45 mph (72 km/h) when loaded
spreader is attached to vehicle. Braking
distances may be increased and handling
characteristics may be impaired at speeds
above 45 mph (72 km/h).
WARNING
Before starting the spreader, the driver shall
verify that all bystanders are a minimum of
25 feet away from operating spreader.

Lit. No. 43755/43757, Rev. 05 18 September 1, 2021
OPERATING THE SPREADER –WIRELESS CONTROL
WARNING
Never operate equipment when under the
inuence of alcohol, drugs, or medications
that might alter your judgment and/or reaction
time.
WARNING
Never allow children to operate or climb on
equipment.
WARNING
Never exceed 45 mph (72 km/h) when loaded
spreader is attached to vehicle. Braking
distances may be increased and handling
characteristics may be impaired at speeds
above 45 mph (72 km/h).
ENSURING THAT THE SPREADER HAS
POWER
The spreader is only compatible with 7‑way
RV‑style trailer plugs. If your vehicle is
not equipped with a 7‑way trailer plug,
contact Customer Support to purchase the
necessary electrical harness (PN 75924).
Fuses are supplied with the spreader. One may
need to be installed in the truck fuse panel for the
7‑way plug to receive power.
1. Begin by unplugging the spreader from the
7‑way plug.
2. Push the toggle switch DOWN into the
"MANUAL OVERRIDE" position.
3. Plug the spreader into the 7‑way plug. The
spreader will start at 100% speed.
WARNING
Before starting the spreader, the driver shall
verify that all bystanders are a minimum of
25 feet away from operating spreader.
4. Unplug the spreader, push the toggle switch into
the center position, and then replug the spreader.
The spreader must be unplugged after running
an override. The wireless key fob control will
remain locked out until power is removed from the
spreader unit.
5. If power is not present, consult the trailering
section in the vehicle owner's manual for more
information.
STARTING AND STOPPING MOTOR
To start the spreader, press either the "50%" or "100%"
speed button on the control.
Press the "OFF" button in the middle of the control to
stop the spreader.
NOTE: The truck ignition must be ON to start the
spreader.
NOTE: If truck ignition is turned OFF while
spreader is running, the motor will stop.
NOTE: The spinner motor is not designed for
continuous duty. Allow the motor to cool between
long cycle times.
SPREADING TIPS
• Spread ice melters with the storm to prevent
unmanageable levels of ice.
• Never exceed 10 mph (16 km/h) when spreading.
• For a heavier pass, drive slower.
• Never operate spreader near pedestrians.
• Calculate spread pattern when near vegetation.
WARNING
The spinner will start immediately upon
connecting power while in manual override
mode. Keep hands and tools clear of spinner
assembly.

Lit. No. 43755/43757, Rev. 05 19 September 1, 2021
1. Unplug the spreader harness from the vehicle
harness.
2. Remove the hitch pin from the receiver hitch.
3. Remove the spreader from the vehicle and stand it
upright. This may require additional support.
CAUTION
During removal or mounting, securely grip
spreader to avoid dropping.
REMOVING THE SPREADER
CAUTION
Empty the hopper before removing the
spreader.

Lit. No. 43755/43757, Rev. 05 20 September 1, 2021
WIRELESS CONTROL PROGRAMMING AND PAIRING
WHEN TO PROGRAM AND PAIR THE
WIRELESS KEY FOB CONTROL
The wireless key fob control included with the
spreader should come paired and ready for use.
If the spreader does not respond to the
wireless key fob control, or after replacing the
battery (CR2032 battery or equivalent), you will need
to program the wireless key fob control and pair it to
the spreader's wireless control module.
ENSURING THAT THE SPREADER HAS
POWER
The spreader is only compatible with 7‑way
RV‑style trailer plugs. If your vehicle is
not equipped with a 7‑way trailer plug,
contact Customer Support to purchase the
necessary electrical harness (PN 75924).
1. The spreader must be receiving power
from the vehicle to pair and program the
wireless key fob control. Begin by unplugging the
spreader from the 7‑way plug.
2. Push the toggle switch DOWN into the
"MANUAL OVERRIDE" position.
3. Plug the spreader into the 7‑way plug. Be sure to
check that the plug polarity is correct as shown
below. The spreader will start at 100% speed.
4. Unplug the spreader, push the toggle switch into
the center position, and then reconnect power to
the spreader.
The spreader must be unplugged after running
an override. The wireless key fob control will
remain locked out until power is removed from the
spreader unit.
5. If power is not present, consult the trailering
section in the vehicle owner's manual for more
information.
Spreader Power Plug End View
Ba
ttery Power POSITIVE (+)
Black Wire
Battery Ground NEGATIVE (–)
White Wire
WARNING
The spinner will start immediately upon
connecting power while in manual override
mode. Keep hands and tools clear of spinner
assembly.