Blizzard 680LT Supplement

2004 Assembly & Operation Manual
Blizzard®Straight Blade Snowplow
Models 680LT & 720LT
www.blizzardplows.com

iTable of Contents
Introduction
Congratulations on purchasing the finest
straight blade snowplow available!
Blizzard straight blades are clearing
new trails for innovative design, rugged
durability, quality craftsmanship and
superior performance. Our exclusive
products are manufactured and tested
in Michigan’s Upper Peninsula, the
snow capital of the Midwest. With an
annual snowfall averaging over 250,"
we couldn’t imagine building snow
removal products anywhere else!
Your Blizzard straight blade is equipped
with versatile features designed for years
of dependable service. The hydraulic
draw latch mounting system positively
aligns the plow for fast installation or
removal. All Blizzard straight blade
snowplows feature an extended mold-
board.This unique construction provides
an additional 5" of blade that rolls snow
farther ahead and to the side when
plowing. Now you can move snow
faster, saving fuel and reducing wear
on your truck and plow. Safety features
include full moldboard trip action,
enclosed hydraulics and automatic
cylinder pressure relief.
To ensure years of optimum snowplow
performance, review the contents of this
manual. It contains assembly informa-
tion, detailed diagrams, complete parts
listings, maintenance guidelines and
troubleshooting tips.
Should you need additional information,
contact your local Blizzard snowplow
dealer. Their knowledgeable staff is well
informed on the latest straight blade
information. They are also your source
for replacement parts, technical assis-
tance and all service repairs.
Comments, suggestions or concerns?
Address all correspondence to:
Blizzard Corporation
Customer Service Department
95 Airpark Boulevard
Calumet, MI 49913
Table of Contents
01 Snowplow Accessories
02 Warning!
03 Snowplow Operation
Assembly Instructions
04 Unpacking & Inspection
05 Moldboard & A-frame Assembly
09 Electrical Assembly - Plow Harness
10 Electrical Assembly - Vehicle Harness
12 Testing The Snowplow
14 Power Hitch™ Instruction
15 Notes
Maintenance & Plow Specifications
16 Regular Maintenance
17 Storing Your Snowplow
18 Plow Specifications
Plow Diagrams & Part Lists
19 Models 680LT & 720LT Parts List
22 Models 680LT & 720LT Assembly Schematic
24 Manifold Detail with Hydraulic & Electrical Schematics
Electrical Diagrams
25 Molded Plug Pin Locations
26 Plow Harness
27 Plow Harness Wire Schematic
28 Main Lighting Harness - Triple Relay Version
29 Main Lighting Harness - Triple Relay Version Wire Schematic
30 Vehicle Harness
31 Vehicle Harness Wire Schematic
32 On/Off Switch Leads & Ground Lead
Torque Specifications
33 Bolts & Hydraulic Adapters
Troubleshooting
34 Troubleshooting Guide
Warranties
36 Limited Consumer Warranty
37 Commercial Warranty

Straight Blade Joystick
Window Mount Bracket
P/N 61261
This adjustable bracket mounts
easily to your straight blade joy-
stick control and installs quickly
onto any door panel. Ideal for left
hand joystick operation or for
vehicles with center consoles. The window mount bracket is shipped
complete with hardware. Some assembly required.
Snowplow Accessories 01
Snowplow Accessories
All of the accessories pictured below are currently offered for your snow-
plow. See your local authorized Blizzard dealer for pricing and availability.
Visit our web site at www.blizzardplows.com to view new snowplow
accessories and our latest Blizzard snowplow wearables.
Touch Pad Control Station
P/N 62142
Small and compact, the Blizzard
straight blade snowplow touch
pad control offers ergonomic com-
fort behind the wheel. Whether
you hold it in your hand, strap it on
your leg, wrap it around your seat
or mount it to the dashboard, this control will provide the flexibility
you need! Control is shipped with a molded plastic leg tray,
adjustable Velcro® strap and extra Velcro® patches. Control
measures 3-1/4" x 3-1/4" x 1-5/16".
Adjustable Pedestal Mount
(For use with all controls)
P/N 63078 (12" Shaft)
Easy-to-install and flexible, our
adjustable pedestal mount will
position your straight blade snow-
plow control station how you want
it! Available in a 12" extension, this
quality built accessory will install
on all Blizzard snowplow control stations in minutes! Ideal for bucket
seat vehicles with low center consoles. Pedestal mount accessory
shipped with complete hardware and adapter plate.
Blizzard Snowplows
Emergency Parts Kit
P/N 63115
Be prepared for unexpected plow
emergencies! This kit includes the
most common replacement parts
conveniently packaged in a small,
durable plastic case. Custom foam
insert holds the following plow
parts: Angle cylinder hose, lift cylinder hose, hitch pin w/hair pin cot-
ter, angle cylinder clevis pin w/cotter, hydraulic adapters, solenoid,
Power Hitch™ toggle switch, corrosion preventive compound (2 oz.)
and 10A fuse. The compact case (13.5"x9"x3.3") allows for easy
storage behind or under your truck seat.
Blizzard Snowplow
Touch-Up Paint
P/N 61219 (Gloss White)
P/N 63073 (Gloss Black)
Putting your snowplow away for
the winter? Have a deep scratch
to cover? Clean up your blade and
plow parts with our gloss spray
paints. Blizzard snowplow touch-
up paint provides an excellent finish to help keep your snowplow
looking its best. Paint provided in 12 oz. spray cans.
Blizzard Snowplow Rapid
Action Hydraulic Oil
P/N 63070 (Quart)
P/N 63071 (12 Quarts/Case)
P/N 63072 (Gallon)
P/N 63069 (4 Gallons/Case)
Blizzard hydraulic oil is specially
formulated for use in Blizzard snow-
plows. This zinc-free product can
significantly enhance the operation and performance of the
hydraulic system in the most inclement weather conditions.
Blizzard hydraulic oil maintains its viscosity to temperatures as low
as -60˚F. Blizzard oil is available by the quart, gallon or case.

02 Warning!
Warning!
Prior to operating your straight blade, review the WARNING! label at the
passenger’s side rear of the moldboard (shown below).
Note: Read and understand all warnings indicated in this manual prior to
operating the snowplow. Warnings and cautions in the manual are indicated
by the icons shown to the left.
WARNING:
CAUTION:
1. Properly mount the snowplow prior to moving the vehicle.
2. To prevent accidental plow activation, turn the Power switch on the snowplow control
to the “OFF” position when not in use.
3. Stand clear of the attachment area when mounting the snowplow to the undercarriage
and operating the Power Hitch Connect/Disconnect switch. Failure to do so may
result in serious injury or death.
4. Securely position all mounting pins prior to operating your snowplow.
5. Do not position your body between the snowplow and the vehicle when servicing
or operating.
6. Position snowplow in such a manner as to not block your vision or plow headlights
while in transit.
7. Do not change the position of the snowplow while in transit.
8. Do not exceed 40 mph when transporting the snowplow.
9. Do not exceed 10 mph when plowing.
10. Always lower the snowplow when the vehicle is parked.
11. Vehicles equipped with air bags are designed to be activated in a frontal collision
equivalent to hitting a solid object or barrier at approximately 14 mph or more.
Careless or high speed driving while plowing snow, which results in vehicle impact
deceleration equivalent to or greater than the airbag deployment threshold described
above, would deploy the airbag.
Blizzard straight blade snowplows are protected by U.S. Patents 6,178,669; 6,276,076 and 6,393,737. Other patents pending.
READ
OWNER’S
MANUAL
THOROUGHLY
PRIOR TO
OPERATING
PLOW.
Calumet, Michigan 49913
BLZ 106 0
WARNING
WARNING
Should the WARNING! label or any of the labels
that came with your snowplow become hard to
read or wear off, contact your local authorized
Blizzard dealer for replacements.

Snowplow Operation 03
Snowplow Operation
Your snowplow is the most advanced and versatile straight blade on the
market. The easy-to-use joystick control allows you to automatically adjust
the plow blade into an infinite number of plowing positions. Review the
illustrations below for instruction on maneuvering your snowplow.
A.
B.
C.
D.
A. Lowered or Float Position
Pushing the joystick forward, toward the “Lower/
Float” designation on the label, will lower your
straight blade to the ground. Pushing and
momentarily holding the joystick ahead will allow
the snowplow to “float”, or follow the contour of
the ground when moving forward or backward.
B. Raised Position
Pulling the joystick back, toward the “Raise”
designation on the label, will lift your straight
blade off of the ground. To stop raising the plow,
simply return the joystick to its “neutral” or center
position. The snowplow has reached its maximum
raised position when the blade stops lifting –
return the joystick to its neutral position.
C. Angled Right Position
To angle your straight blade to the right, position
the joystick toward the “R” on the label. To stop
angling the plow, return the joystick to its “neutral”
or center position. The snowplow has reached its
maximum angled position when the blade stops
moving to the right side.
D. Angled Left Position
To angle your straight blade to the left, position
the joystick toward the “L” on the label. To stop
angling the plow, return the joystick to its “neutral”
or center position. The snowplow has reached its
maximum angled position when the blade stops
moving to the left side.
***** IMPORTANT *****
To prevent premature failure of the power
contactor (solenoid), initiate the plow function
and return the joystick to its neutral or center
position— except float. DO NOT hold the joy-
stick in any position that allows the pump to
continuously run after the plow has reached
its maximum degree of movement. This will
reduce the useful life of the solenoid.
BLIZZARD
To prevent accidental plow activation, turn
POWER switch to the “OFF” position when
not in use. BLZ 1017
WARNING
®

04 Unpacking & Inspection
Assembly Instructions
Unpacking & Inspection
Your Blizzard straight blade has been packaged to withstand transit and
weather related damage. Fully inspect all components upon receipt of your
plow. In the event of shipping damage or missing parts, immediately contact
our Customer Service Department toll free at 1-888-680-8600.
Begin unpacking and inspection in the following order:
1. Remove the shipping document from the end panel of the pallet wrap.
Retain all documentation for your records.
2. All wood framing and polyethylene material should be removed from
the pallet for easy access to the snowplow.
3. Due to the odd shaped components and size of several assembly
parts, various cable ties and corrugated material are used for scratch
resistance and package orientation. Please remove these items prior
to assembly.
4. Place the main blade assembly on a flat, level surface.
Once you have inspected all parts and removed all packaging materials,
your snowplow is ready to be fully assembled.
Pallet Wrap End Panel
The tear resistant woven polyethylene pallet wrap
contains a moisture barrier to help protect all
packaged components and keep out the most
inclement weather during shipping and storage.
The end panel of the pallet cover contains impor-
tant information regarding the snowplow model
and the plow’s serial number. Both of these num-
bers are given together. The first three digits and
two letters in the the number indicated is always
the plow model 680LT or 720LT – and the entire
ten digit number make up the serial number. The
shipping document is also attached to the end
panel. Be sure to retain this list for your records.
Snowplow Serial Number
Hydraulic Pump Serial Number
Telephone Number
Dealer/Distributor
Date of Purchase

The kickstand mounts to the side of the pivot
beam with one 1/2"-13 x 4-1/2" hex cap screw
and top lock nut. To pivot the kickstand, simply
pull the spring loaded leg out and rotate it until
the pin locks into place. The kickstand also has
an adjustable foot that can be moved to accom-
modate varying vehicle heights. Adjust the kick-
stand foot approximately 1/8" short of level ground.
This will prevent the kickstand from hitting the
ground before the plow cutting edges. The proper
height of your snowplow mounting points to level
ground should be set at 10-1/2".
1/8" Ground
Clearance
Spring Loaded
Adjustable
Pivot Beam
Kickstand
Moldboard & A-frame Assembly 05
7/16" 7/16"
Male O.R.B. Connector Adapter
Moldboard & A-Frame Assembly
1. Begin the moldboard assembly by positioning the PIVOT BEAM and
A-FRAME near the connecting points at the rear of the blade between
the two center support ribs. Position the pivot beam between the two
support ribs until the connecting points on the beam align with those
on the plow. Insert one 3/4" DIA. x 3" CLEVIS PIN through each mount-
ing hole and secure them with one 1/4" DIA. x 1-1/2" COTTER PIN.
Note: Mount the kickstand to the end of the pivot beam (driver’s side)
using the 1/2"-13 x 4-1/2" bolt provided. The spring, bushing and lock
nut locate on the inside of the pivot beam. Review the diagram to the
right and on page 22. Upon installation, rotate the spring loaded kick-
stand clockwise until it locks into place. Adjust the foot on the stand
arm so the height of the A-frame, at its mount points, is 10-1/2" to
level ground.Tighten both of the 1/2"-13 top lock nuts on the kickstand.
Note: To prevent the kickstand from hitting the ground before the
snowplow cutting edges, causing stress on the kickstand lock pin,
adjust the kickstand foot approximately 1/8" short of level ground.
This procedure will provide clearance for the kickstand when the
snowplow is lowered with the kickstand in the down position.
2. Remove each dust cap from both of the ANGLE CYLINDER ports and
attach one 7/16"-20 x 7/16"-20 MALE O.R.B. CONNECTOR ADAPTER
to each port. Note: All of the hydraulic adapters can be found pack-
aged with the manifold assembly. Reference the torque specifications
table on page 33. Connect one 1/4" x 15" hydraulic hose (P/N 60294)
to the driver’s side angle cylinder adapter. Note: The 90˚ end on the
hose connects to the manifold. Connect one 1/4" x 20" hydraulic hose
(P/N 60296) to the passenger’s side angle cylinder adapter. Be careful
not to overtighten the hose connections. Route both hoses through
the access holes in A-frame at the A-frame angle cylinder mount
brackets. Both hoses should extend through the triangular openings at
the top of the A-frame.
3. Position each ANGLE CYLINDER with the rod end of the cylinder in
the pivot beam and the base end in the A-frame angle cylinder mount
bracket. Secure each cylinder to the pivot beam and A-frame using
two 3/4" x 3" CLEVIS PINS with 1/4" x 1-1/2" COTTER PINS.
4. Next, remove both of the plastic dust caps from the HYDRAULIC LIFT
CYLINDER ports. Attach one 7/16"-20 x 7/16"-20 MALE O.R.B. CON-
NECTOR ADAPTER to the retract port (rod end) and one 7/16"-20 x
7/16"-20 90˚ O.R.B. ADJUSTABLE ELBOW ADAPTER to the extend
port (base end). Once the adapters have been installed on the cylinder,
connect the rod end hose. The male connector adapter receives a
1/4" x 18" hydraulic hose (P/N 60295).
5. Position the lift cylinder in the channel opening under the A-frame.
Route the 18" rod end hose through the front (closest to the pivot
beam) 2" diameter hole in the A-frame.The lift cylinder base end hole
should align with the holes on either side of the channel. Secure the
lift cylinder to the A-frame using one 5/8" DIA. x 5-3/4" CLEVIS PIN
and one 1/4" x 1-1/2" cotter pin. Use the access hole in the A-frame,
located at the driver’s side, to install the clevis pin. The 90˚ adjustable
elbow adapter receives the 1/4" x 10" hydraulic hose (P/N 60293).
10-1/2"
7/16"
7/16"
90˚ O.R.B. Adjustable Elbow Adapter

06 Moldboard & A-frame Assembly (Continued)
6. Begin the draw latch installation by first removing the DRAW LATCH
MOUNT PIN, SPACER & COTTER PIN from the assembly. By removing
this pin, the INNER DRAW LATCH PLATES can swing free. Proceed
to remove the INNER DRAW LATCH PLATE LIFT CYLINDER MOUNT
PIN. Position the plates on either side of the lift cylinder rod and insert
the pin through the plates and cylinder rod. With the cylinder con-
nected to the inner draw latch plates, rotate the draw latch assembly
toward the draw latch mount holes on the A-frame. Align the holes in
the outer draw latch plate with those of the inner draw latch plates
and the A-frame. Note: The A-FRAME LATCH, located at the rear
center of the A-frame, should be raised up to insert the draw latch
mount pin. Pull the A-FRAME LATCH PULL PIN out and rotate the
latch counterclockwise if it is locked into position. Secure the assembly
to the A-frame by replacing the draw latch mount pin spacer and cotter
pin. Reset the A-frame latch so the latch pull pin locks into place.
Once you have completed the draw latch installation, proceed to assemble
the manifold. The manifold, pump and coil harness have been joined
together at the factory; however, the manifold contains several components
that you will need to install prior to securing the assembly to the A-frame.
7. Each of the 4 HOSE PORTS on the HYDRAULIC MANIFOLD are
covered with stretch wrap. Remove the wrap and install the appropriate
fitting (illustrated on page 7) in its respective port.
Note: All ports are identified by a stamped number on the manifold.
The numbers also identify the hydraulic functions, which can be ref-
erenced on the label under the hydraulic pump and manifold cover
(see illustration on page 7).
Outer Draw
Latch Plate
Draw Latch
Mount Pin
(1" DIA. x 3-1/4")
Hydraulic
Lift / Lower
Cylinder
Draw Pin
(1" DIA. x 4-1/2")
Clevis Pin
(3/4" x 3-7/16")
Hex Head Cap Screw
(3/4"-10 x 3-1/2")
Cotter Pin
(3/16" x 2-1/2")
Inner Draw Latch Plate
Lift Cylinder Mount Pin
(5/8" DIA. x 2-1/16")
Draw Latch Arm
Pivot Pin
(3/4" DIA. x 2-1/16")
Cotter Pin
(1/4" x 1-1/2")
Top Lock Nut
(3/4"-10)
Inner Draw
Latch Plate
Draw Latch
Arm Weldment
Draw Latch
Finger Weldment
A-Frame Latch
Lock Pin
Draw
Pin
A-Frame Latch
Rotates Clockwise
And Hooks Onto
Draw Pin
A-Frame
Latch
To mount the straight blade, the A-frame latch
should be lowered over the draw pin– this allows
the draw latch to pull the plow into the undercar-
riage. Once the plow is safely attached to the
undercarriage, rotate the A-frame latch counter-
clockwise until the lock pin snaps into place. The
A-frame latch is only used to mount the plow.
The A-frame latch should always be locked in
place when not in use.
Printed
Label
All of the hoses shipped with the snowplow con-
tain a printed label (with a part number) applied
to the hose. Install the following hoses to their
respective ports on the manifold:
Hose P/N 60294 Port #1
Hose P/N 60296 Port #2
Hose P/N 60293 Port #3
Hose P/N 60295 Port #4
Draw Latch Assembly
The draw latch consists of a series of intercon-
nected plates and pins that attach to the A-frame
and the hydraulic lift cylinder.

9/16"
7/16"
1
23
4
7/16" 9/16"
Moldboard & A-frame Assembly (Continued) 07
Male O.R.B. Connector Adapter
(Port #2)
S6 S8S4
RV FC
S3 S5
Hydraulic Hose Identification Guide
Straight Blade Snowplows
Calumet, Michigan 49913
HYDRAULIC HOSES
1
23
Port Function
S3
S4
S5
S6
S5 & S8
BLZ 1054
NOTE: Energize the following
solenoids for the functions:
1
2
3
4
Pressure Gauge
Quick Connect Clockwise - Decreases Plow Drop Speed
Counterclockwise - Increases Plow Drop Speed
4
Right Angle - Left Cylinder
Left Angle - Right Cylinder
Raise - Lift Cylinder (Base)
Lower - Lift Cylinder (Rod)
Angle Relief Valve
Variable Flow Control Valve
RV
FC
Left Angle - Right Cylinder
Right Angle - Left Cylinder
Float
Raise - Lift Cylinder (Base)
Lower - Lift Cylinder (Rod)
8. Next, align the mount holes on the pump and the manifold with the
holes in the brackets located on the A-frame. When installed correctly,
the manifold will be located at the front of the A-frame closest to the
pivot beam.
CAUTION:When installing the manifold between the mount
brackets on the A-frame, hold the manifold at the sides of
the block. Never handle the manifold by the wire lead coils.
Doing so can cause a solenoid cartridge to bend, causing
the cartridge to stick when activated.
When installing the manifold between the mount
brackets on the A-frame, DO NOT handle the
manifold by the wire lead coils. The solenoid
cartridges can bend, causing them to stick when
activated. Always carry the manifold by the sides
of the aluminum block.
Installing The Manifold Adapters
There are a total of 4 hydraulic adapters to install.
All of the adapters can be found packaged with
the manifold assembly. Remove the protective
stretch wrap from the manifold in a clean area.
DO NOT let any foreign objects enter into the
open ports.The valves can become contaminated
and greatly hinder the plow’s performance.
Review the table on page 33 for proper torque
specifications.
Note: The gray arrows shown in the manifold illustration above indicate
the direction the 90˚ adapters should face to receive the hydraulic hoses.
90˚ Adjustable Elbow O.R.B. Adapter
(Ports #1, #3 & #4)

08 Moldboard & A-frame Assembly (Continued)
Secure one 3/8" flat washer, lock washer and 3/8"-16 x 1-1/4" hex
head cap screw through the top mount hole in the rear bracket and
into the pump. The bottom mount hole receives one 3/8" INTERNAL/
EXTERNAL TOOTH LOCK WASHER, 3/8" lock washer and 3/8"-16 x
1-1/4" hex head cap screw. The bottom mount location will serve as
the ground for the plow electrical harness. Installation instructions for
the harness can be found on page 9. Note: A medium strength
threadlocker, such as Loctite® 242® should be used on the pump
and manifold mount fasteners. This will help prevent the fasteners
from working free. Mount the manifold to the side brackets on the A-
frame using the hardware provided on the manifold. The passenger’s
side mount bracket will serve as the ground location for the manifold
coil harness. Installation instructions for the coil harness can be found
on page 9.
9. Once the pump and manifold assembly is in place, connect the
hydraulic hoses to their respective adapters on the manifold. Review
the label under the pump cover to identify which hoses connect to
each port (See page 7).
Begin installing the hoses with the lift cylinder hoses. Connect the
base end hose (P/N 60293) to port #3. Connect the rod end hose
(P/N 60295) to port #4. Next, attach the 90˚ fitting, on the passenger’s
side angle cylinder hose (P/N 60296), to the male connector adapter
on port #2. Route the hose under the pump and over the manifold.
Lastly, connect the driver’s side angle cylinder hose (P/N 60294) to
port #1. Route the hose over the pump to the hydraulic adapter.
10. Hook each EXTENSION SPRING to the receiving holes located on
the pivot beam and connect the opposite end of the spring to their
respective SPADE BOLTS. Install the 5/8"-11 x 4-3/8" spade bolts
through the EXTENSION SPRING MOUNTING ANGLE on the top rear
of the blade. Secure each spade bolt by placing one 5/8" flat washer
on the bolt and thread one 5/8"-11 nylon insert lock nut. Tighten each
lock nut until a piece of paper can pass between the 3th & 4th coils
on the spring.
11. Install the flexible BLADE GUIDES at each end of the moldboard.
Insert the 5/16"-18 x 1" hex head cap screw through the holes provided
at the top of the outside reinforcement rib.Tighten all screws using the
nylon insert lock nuts provided.
Congratulations! You have successfully completed half of the installation.
Don’t quit now, you’re nearly out of the garage!
A medium strength threadlocker, such as
Loctite® 242®, should be used to properly
secure the mount hardware for the pump and
manifold.This will help prevent the hardware from
working free from vibration and plow use. Apply
a liberal amount of threadlocker to all threaded
fasteners and the threads in the pump and mani-
fold. Both the pump and manifold receive two
3/8"-16 x 1-1/4" hex cap screws—one on each
side of the A-frame and two into the pump.
Use Loctite®On All Manifold
Mount Hardware

Electrical Assembly - Plow Harness 09
Electrical Assembly - Plow Harness
1. Begin the electrical assembly by connecting the RED POWER WIRE
from the PLOW ELECTRICAL HARNESS to the PUMP motor terminal
stud using the hardware provided on the pump. Note: The red power
wire contains an end ring terminal too large for the pump motor stud.
Remove the end ring terminal from the harness and replace it with
the 1/4" DIA. END RING TERMINAL located on the pump motor
terminal stud.
2. Next, remove the bottom bolt, lock washer and internal/external tooth
lock washer from the rear pump mount bracket. Route the BLACK
GROUND WIRE (from the harness) under the pump on the driver’s
side of the A-frame. Align the tooth lock washer and end ring terminal
over the hole on the bracket and secure them with the lock washer
and bolt.
3. The manifold contains a red COIL WIRE HARNESS that must be
grounded to the A-frame. Locate the 3/8" end ring terminal on this
harness and secure it to the passenger’s side manifold mount bracket.
Use the existing manifold mount hardware to secure the ground. Note:
The internal/external tooth lock washer provided should install against
the mount bracket to provide a solid ground.
4. Remove the hex jam nut and external tooth lock washer from the
POWER HITCH CONNECT/DISCONNECT TOGGLE SWITCH and
insert it through the back of the mount bracket on the A-frame. Align
the notch in the key washer on the switch to the notch on the bracket.
Replace the lock washer and jam nut and tighten until the switch is
firmly in place. Next, attach the connector on the plow harness to the
switch. Note: Use caution when making the connection. Switches can
break if done forcefully.
5. Continue the harness installation by connecting the PLASTIC FEMALE
ELECTRICAL CONNECTOR on the harness to the PLASTIC MALE
ELECTRICAL CONNECTOR found on the coil wire harness.
6. Finalize the harness installation by positioning the wire harness braid
in the notch on the switch bracket and secure it with a cable tie. Note:
The DIODE LOOP HARNESS should be positioned inside of the
pump cover.
7. Next, place the MOLDED RUBBER POWER CONNECTOR (from the
harness) through the hole in the PUMP & MANIFOLD COVER. Position
the cover over the protective toggle switch hood. Align the front and
rear holes in the cover with the U-NUTS located on the mount tabs.
Secure the pump cover with two 3/8"-16 x 1-1/8" CLAMPING KNOBS.
Congratulations! You have just completed building the finest snowplow
available! However, the vehicle wire harness still needs to be installed.
That is the focus of the second half of the electrical assembly instruction.
Diode Pack
Mount Bracket
Draw Latch
Toggle Switch
Mount Bracket
The draw latch toggle switch installs through the
rear of the bracket with the protective hood. Align
the key washer with the slot cut in the bracket to
prevent the switch from turning. Secure the
switch with the hardware provided. Note: Use the
square notch in the bracket (below the protective
hood) to position the braided harness. Use another
cable tie to hold the harness against the bracket.
The Pump Cover Installs Over
The Top Of The Draw Latch
Switch Bracket
To properly secure the pump and manifold cover
on the A-frame, position the cover over the top of
the protective hood on the draw latch switch
mount bracket. Align the holes in the cover with
the U-clips on the welded A-frame tabs. Secure
the cover using two clamping knobs.

10 Electrical Assembly - Vehicle Harness
Electrical Assembly - Vehicle Harness
CAUTION: Always perform the vehicle wire harness assem-
bly with the vehicle off and the keys out of the ignition. Use
caution when testing the electrical wires for the vehicle’s
headlight functions.
1. Begin the installation of the electrical harness under the hood. Insert
the WHITE POWER CONNECTOR & RED POWER WIRE (with FUSE)
end of the harness through the driver’s side fire wall access panel into
the vehicle cab. Note:You may need to widen an opening or cut access
to the cab interior to facilitate the assembly. Loosely position the
remaining portion of the harness over the driver’s side fender well and
place the MOLDED RUBBER POWER CONNECTOR near the bumper.
Note: Keep the plow and vehicle rubber power connector pins lubri-
cated with a liberal amount of dielectric grease. Always replace the
protective RUBBER WEATHER CAPS when the plow is disconnected
from the vehicle.
2. Next, attach the POWER CONTACTOR (SOLENOID) to the driver’s
side wheel well or engine fan guard using two 12-14 x 3/4" hex washer
self-drilling screws. Note: Some model vehicles provide mounting
locations for accessory components. Always mount the solenoid with
the terminals facing up. This will extend the useful life of the solenoid.
Connect the 24" BLACK GROUND WIRE to either small terminal on
the solenoid and attach the opposite end to the vehicle with one hex
washer self-drilling screw. Locate the BROWN/WHITE PUMP SOLE-
NOID ACTIVATION WIRE on the wire harness and position the eyelet
over the remaining small terminal on the contactor. Secure it with the
hardware provided on the solenoid.
3. Proceed to connect the BLACK VEHICLE WIRE HARNESS GROUND
WIRE to the negative terminal on the vehicle’s battery. Cut the wire to
length and crimp a 3/8" DIA. END RING TERMINAL on the wire. It is
also recommended that the ring terminal be soldered. Note: The har-
ness should be secured to the vehicle prior to taking the necessary
measurement. Measure the distance needed for the RED POWER
WIRE to reach the solenoid and properly secure an end ring terminal
to it. Connect the power wire to either large terminal on the solenoid.
CAUTION: Do not fasten the wire harness to areas that come
in contact with moving engine parts or possess extreme
heat.The harness could become tangled and/or melt causing
electrical failure and vehicle damage.
4. Attach and solder an end ring terminal to both ends of the remaining
length of the red 4 gauge wire. Connect one end of the wire to the
open terminal on the solenoid and the remaining end to the positive
terminal on the battery.
5. With the vehicle harness secured to the truck, position the MAIN
LIGHTING HARNESS such that both of the large, gray VEHICLE
HEADLIGHT CONNECTORS are near the truck headlights and the
smaller, black PLOW HEADLIGHT CONNECTORS are near the grill
of the vehicle.
AB
C D
Heavy-Duty Power Contactor (Solenoid)
There are four wires that need to be attached to
the power contactor:
(A) Red Power Battery Wire
(B) Vehicle Wire Harness Red Power Wire
(C) 24" Black Ground Wire
(D) Brown/White Pump Solenoid Activation Wire

Elec. Assem. - Vehicle Harness (Continued) 11
6. Plug the HEADLIGHT GROUND/RELAY (BLACK & GREEN/YELLOW)
CONNECTOR, from the vehicle wire harness, into the connector on
the main lighting harness. With the connection made, plug each
HEADLIGHT RELAY into the receptacles. Securely mount the recep-
tacles to the vehicle with the terminal wires facing down and the relays
facing up. Installing the relays in this position will allow moisture to
drain from the relay.
7. Next, remove the front directional light assembly on the driver’s side
of the vehicle. Feed the VIOLET, turn light wire and GRAY, run light wire
from the main lighting harness through the opening in the directional
light housing. At this point, use a test light or ohm meter to determine
the proper wires in the vehicle’s electrical system to splice into. Once
you have identified the proper wires, position one end of the turn or
run light wire into a SPLICE LOCK CONNECTOR provided. Attach
the vehicle wire to the opposite side of the splice lock connector.
Complete the splice by pinching both wires together and locking the
connector. Repeat the splice procedure for the remaining wire. The
passenger’s side directional light assembly requires the same instal-
lation; however, only one wire, the PINK, turn light, needs to be spliced.
8. Connect the vehicle headlights to the main lighting harness using a
HEADLIGHT ADAPTER KIT. Due to differences in the construction
of the adapter kits, and the various make and model vehicles Blizzard
snowplows are installed on, a headlight adapter kit is not packaged
with your snowplow. Contact your local Blizzard dealer to obtain the
appropriate adapter for your vehicle.
9. Begin the adapter kit installation by removing the existing vehicle head-
light connector from the headlight. Attach the HEADLIGHT ADAPTER
CONNECTOR to the existing vehicle headlight connector. Next, plug
the BLACK, FIVE-PIN CONNECTOR on the headlight adapter into
the gray, five-pin connector on the vehicle wire harness. Lastly, plug the
HEADLIGHT ADAPTER CONNECTOR into the vehicle headlight re-
ceptacle. Note: If more than one plug is present, match the colors of
each connector (ie gray to gray, black to black, Chevrolet daylight run-
ning is clear to gray). Repeat the installation for the opposite headlight.
10. Once the headlight adapter connections are completed, proceed to
secure the braided harness to the vehicle. Safely route all harness
lengths around the engine components and attach them to the vehicle
with cable ties. Extend the PLOW HEADLIGHT CONNECTORS, from
the main lighting harness, through the grill of the vehicle and position
the HARNESS POWER PLUG and WEATHER CAP near the bumper.
Cable tie the power plug to the vehicle bumper or tow hook to keep
the harness from hanging too low.
11. Return to the driver’s side cab interior to install the remainder of the
vehicle wire harness. Connect the RED POWER WIRE (with 15 AMP
FUSE) to a switched power source with a minimum of 15 amps. Note:
The red power wire MUST be fused and switched on and off with
ignition. Secure all loose wires under the dash.
Snowplow Hitch Pin
& Hair Pin Cotter
In the event you should lose hydraulic power while
snowplowing, raise the snowplow into a pile of
snow and insert the emergency hitch pin provided
with your plow. The pin will lock the plow in a tem-
porary raised position until proper service can be
performed to restore hydraulic power. Note: For
clarity, the draw latch is not illustrated.
The vehicle wire harness is packaged with three
12V quick connect, sealed headlight relays. The
relays install into the black receptacles located on
the main lighting harness. Review the diagram on
page 28.

12 Testing The Snowplow
12. Find an accessible location under the dashboard for the PLOW
HEADLIGHT TOGGLE SWITCH & BRACKET. Install the headlight
bracket using two self-drilling screws. Insert the toggle switch through
the bracket and secure it with the hardware provided. Use the MALE
2-PIN POWER CONNECTOR to connect the toggle switch to the
vehicle wire harness.
First, insert the 24" GREEN/YELLOW GROUND LEAD into the
FEMALE 2-PIN POWER CONNECTOR (on the vehicle wire harness).
This lead should be grounded to the vehicle. Next, plug both of the
SWITCH LEADS into the toggle switch. Note: Both terminals should
be inserted into the spades on the same side of the switch. One
terminal should be positioned in the middle spade. See the illustration
to the left and on page 32. Plug both 2-pin power connectors together.
13. Next, install the LIGHT TOWER. Position the tower arms into the
receiving pockets located on the undercarriage. Each pocket has a
lock pin that secures both light tower arms. Pull out and twist each
handle to temporarily unlock the pins. Place the light tower into the
pockets and relock the pins. See your local Blizzard dealer for com-
plete installation instructions for your vehicle undercarriage.
14. Proceed to install the PLOW HEADLIGHTS. Align one HEADLIGHT
BALL STUD MOUNT ADAPTER on the light tower tube with the
mounting hole and insert the threaded stud through each. Secure the
headlight with one 1/2" galvanized washer (neoprene facing up), one
7/16" external tooth lock washer and hex nut. Note: All snowplows are
shipped with two BLACK VINYL CAPS that install at either end of the
light tower. Connect the terminals from the plow lights to the terminals
on the main lighting harness. Repeat the installation for the opposite
headlight.
15. Align the four mount holes on the JOYSTICK CONTROL with the
holes located on the JOYSTICK BENCH MOUNT PEDESTAL. Note:
The radius on the pedestal should face the dashboard.Secure the
joystick to the pedestal with four 8-32 x 3/4" machine screws provided.
Next, slide the VELCRO® STRAP through the slots cut in the pedestal.
The metal D-RING should be located on the side opposite of the radius.
Wrap the strap around the bench and fasten. Finally, connect the
white power connector from the vehicle wire harness to the connector
on the control station. The power switch on the joystick should be in
the middle or “OFF” position. See the diagram to the left.
This completes the electrical assembly installation for the vehicle wire
harness and main lighting harness. You are now ready to perform all of
the test functions on the snowplow.
Testing The Snowplow
1. Fill the HYDRAULIC PUMP FLUID RESERVOIR with BLIZZARD
SNOWPLOW RAPID ACTION HYDRAULIC OIL (P/N 63070) until it
is approximately 3/4" from the top of the tank. Replace the cap on the
reservoir. Proceed to remove the weather caps from each of the plow
and vehicle wire harnesses and connect the plugs. Turn the POWER
Insert one terminal into
the middle spade.
Remaining terminal connects
to either spade on the SAME
side of the switch.
Vinyl
Cap
The black vinyl caps provided with your snowplow
install at each end of the light tower. Adjust the
plow headlights as desired, secure each with
hardware provided and finish the installation by
capping the light tower ends.
Power Hitch
Operation
BLZ 1061
System Power
Turned “OFF”
System Power
Turned “ON”
POWER
SWITCH

Testing The Snowplow (Continued) 13
SWITCH on the joystick (in the cab) to the “ON” position and turn the
vehicle ignition switch on.You now have power to the snowplow. Once
all of the hydraulic functions have been executed, the system will have
been filled with approximately 1-1/2 to 2 quarts of hydraulic oil.
2. To raise the POWER HITCH on the snowplow, turn the power switch
on the control station to the up or “ON” position. Push and hold the
toggle switch on the A-frame upward into the “CONNECT” position.
Notice the action of the fluid in the reservoir. By activating the initial
hydraulic function, the fluid begins to fill the system. Push and hold the
toggle switch in the “DISCONNECT” position, the Power Hitch will lower.
Refill the reservoir until the fluid is 3/4" from the top of the tank.
3. Position the vehicle such that the draw latch is below the push beam
and the mounting points on the A-frame are in line with the mounting
points on the undercarriage. Pull out the A-FRAME LATCH PIN and
rotate the A-FRAME LATCH clockwise until the latch is resting on the
DRAW PIN (See diagram on page 14). Move the snowplow in position
by activating the draw latch connect switch and release.
WARNING: Always use caution when operating the draw
latch CONNECT/DISCONNECT switch. Keep your hands and
feet away from the operation of the draw latch and the main
blade. The action of the draw latch moves the snowplow in
position for proper attachment to the vehicle. Failure to follow
this warning may result in serious injury or death.
The Power Hitch will raise until it hits the push beam and the DRAW
LATCH FINGERS will pull the plow into the vehicle. The mounting
points on the plow and vehicle are now positively aligned. Rotate the
A-frame latch counterclockwise until the latch is locked in the raised
position. Insert the two HITCH PINS through the mounting holes on
the A-frame and secure each with one hair pin cotter. The snowplow
is now securely mounted to the vehicle.
4. Return to the interior of the vehicle. With the plow securely in place,
you can now execute the remaining functions of the snowplow. The
power supply on the joystick should be in the “ON” position. Next, raise
the plow to its maximum height by pulling back (“RAISE”) on the joy-
stick. Angle the snowplow to the left by moving the joystick toward the
“L” (left angle) on the label. If the plow function is slow or delayed, the
hydraulic fluid is filling the cylinder and replacing the air in the system.
Continue testing the remaining joystick functions. Monitor the fluid level
in the reservoir and fill to 3/4" from the top of the tank if needed. Also,
look for any hydraulic fluid leaks around the manifold, pump, hydraulic
hoses and all cylinders.
5. Lastly, check that the vehicle and plow headlights are in proper work-
ing condition including the turn signals. If necessary, adjust the plow
headlight beams with the plow in the raised position.
Congratulations on a successful assembly and installation! Once all of the
blade and electrical functions have been tested your Blizzard straight
blade is ready for action. Should you need additional support during a
plow assembly or undercarriage installation, contact your local authorized
Blizzard dealer.
BLIZZARD
To prevent accidental plow activation, turn
POWER switch to the “OFF” position when
not in use. BLZ 1017
WARNING
®
Your Blizzard straight blade snowplow will use
approximately 1-1/2 to 2 quarts of Blizzard Rapid
Action Hydraulic Oil. Blizzard hydraulic oil is also
available by the case (P/N 63071), gallon (P/N
63072) or gallon case (P/N 63069). See your
local authorized Blizzard dealer for price and
availability.

14 Power Hitch™ Instruction
Power Hitch™Instruction
Prior to operating your straight blade, review the Mounting & Dismounting
Instructions label at the driver’s side rear of the moldboard (shown below).
MOUNTING & DISMOUNTING
INSTRUCTIONS
BLZ 1059
TM
A-Frame Latch
Rotates Clockwise
And Hooks Onto
Draw Pin
K
E
E
P
F
I
N
G
E
R
S
A
W
A
Y
!
Should the Mounting & Dismounting Instructions
label or any of the labels that came with your
snowplow become hard to read or wear off, contact
your local authorized Blizzard dealer for
replacements.

Notes 15
Notes

16 Regular Maintenance
Regular Maintenance
Your Blizzard straight blade snowplow has been designed for years of
rugged, dependable service with low maintenance. To ensure proper
working condition, follow the maintenance guidelines below and on the
next page.
CAUTION: Always follow the maintenance guidelines in a timely
fashion. Failure to observe maintenance guidelines may result
in poor snowplow operation, increased component wear or
possibly lead to part failure.
Routinely inspect the following items – perform maintenance as needed:
1. All fasteners, pins, nuts and bolts for tightness. See the recommended
maximum bolt torque chart on page 33.
2. All hydraulic hoses and hydraulic hose adapters for wear and leaks.
See the recommended hydraulic adapter torque values on page 33.
3. All cylinders for leaks; inspect rod ends for corrosion and pitting.
4. Cutting edges and plow shoes for wear. Do not discard plow shoe
washers. These should be retained for different shoe adjustments.
5. Clean and lubricate all electrical plugs, headlight connections, ground
and battery cables, solenoid connections and switch connections to
prevent corrosion. Apply dielectric grease for every 25 hours of snow-
plow use.You may need to grease more frequently depending on your
plowing environment.
6. Lubricate all pins and bushings to prevent corrosion and to maintain
consistent operation, including the A-frame latch. A NLGI Grade 2
multipurpose lithium complex grease with molybdenum (MPGM) is
recommended for lubrication.
7. Clean and cover deep scratches or exposed metal with Blizzard Snow-
plow white (P/N 61219) or black (P/N 63073) touch-up paint. Contact
your local Blizzard Dealer for availability.
8. Check the hydraulic oil level in the hydraulic pump fluid reservoir. Fill
the fluid to within 3/4" from the top of the reservoir. Do not exceed this
level. Never mix different types of fluids. Contact your local dealer for
replacement Blizzard Snowplow Rapid Action Hydraulic Oil (P/N 63070).
9. Check the trip spring adjustment. Properly adjusted tension will allow
a sheet of paper to pass between the 3rd and 4th coils of the spring.
10. To adjust the snowplow drop speed, use the variable flow control valve
(FC) on the manifold (see label under pump & manifold cover). Turn the
dial on the valve clockwise to decrease the drop speed. Turn the dial
counterclockwise to increase the drop speed. See the Troubleshooting
Guide on page 35 for additional instructions.
11. Do not allow snow and ice to build-up on the pump and manifold cover.
Excessive build-up may cause bumper damage when the plow is raised.
Maintenance Schedule
Maintenance Performed Date

Storing Your Snowplow 17
Storing Your Snowplow
Placing Your Plow In Storage
1. Position your plow on a flat, level surface for storage. Follow the dis-
mounting procedure illustrated on page 14.
2. Pressure wash and dry the entire snowplow prior to placing in storage.
3. Apply a liberal amount of dielectric grease to all electrical plugs and
connections. Clean and install all dust caps.
4. Lubricate all exposed hydraulic cylinder rod ends with liquid white
lithium grease to prevent corrosion.
5. Lubricate all pins and bushings to prevent corrosion and to maintain
consistent operation, including the A-frame latch. A NLGI Grade 2
multipurpose lithium complex grease with molybdenum (MPGM) is
recommended for lubrication.
6. Clean and cover deep scratches or exposed metal with Blizzard Snow-
plow white (P/N 61219) or black (P/N 63073) touch-up paint. Contact
your local Blizzard dealer for availability.
7. Remove and properly discard the fluid from the pump reservoir. Clean
the pump filter and replace the hydraulic oil to within 3/4" from the top
of the reservoir. Changing the fluid annually will prolong the life of your
pump and manifold. Never mix different types of hydraulic oil. Contact
your local dealer for replacement Blizzard Snowplow Rapid Action
Hydraulic Oil (P/N 63070).
8. Cover the snowplow with a tarp if stored outside. This will protect your
plow from sun fading and inclement weather which can lead to
accelerated corrosion.
Removing Your Plow From Storage
1. Perform all regular maintenance indicated on the previous page.
2. If you have not replaced the hydraulic oil in the pump reservoir, it is
strongly encouraged that you do so prior to operating your plow. Pro-
longed storage could result in condensation build-up.
3. Follow the mounting procedure illustrated on page 14.
4. Once the plow has been properly mounted to the vehicle and all
electrical connections have been made, initiate all of the functions of
the snowplow. Monitor the fluid level in the reservoir and fill to 3/4" from
the top of the tank if needed.
5. Adjust the snowplow headlights as needed.
Annual Fluid Replacement
Type & Quantity of Fluid Replaced Date

18 Plow Specifications
Plow Specifications
Moldboard
Length
680LT ..................................................................................6'-8"
720LT ..................................................................................7'-2"
Thickness ........................................................................16 Gauge
Height
680LT ..............................................................................21-1/2"
720LT ..............................................................................23-1/2"
Reinforcement ........................................................4 Ribs @ 3/16"
Cutting Edge ..........................................................1/4" x 5" (1080)
Finish ............................................................Powder Coat - White
Trip Mechanism
Trip Spring Type ..................................(4) 5/16" Hooked Extension
Trip Spring Adjustment ......................5/8"-11 x 4-3/8" Spade Bolts
A-frame
Material ................................................Rec. Tube & Channel Type
Hitch Pins........................................................3/4" x 6" Yellow Zinc
Finish..............................................................Powder Coat - Black
Pump
Construction............................Steel Housing w/Clear Plastic Tank
Type ................................................................Internal Gear Pump
Size ......................................................................................0.7 cc
Motor ............................................................................12V Starter
Volume Per Minute ......................................0.8 GPM @ 1500 PSI
Weight ..................................................................................9.2 lb.
Mount ....................................A-frame Install w/Hex Head Screws
Reservoir Capacity ........................................................1.2 quarts
Controls ..................................................Toggle Switch & Joystick
Manifold
Construction ............................................Red Anodized Aluminum
Ports..............................................................................................4
Cartridge Valves............................................................................5
Relief Valve ..................................................................................1
Flow Control Valve ........................................................................1
Weight ................................................................................13.3 lb.
Mount ....................................A-frame Install w/Hex Head Screws
Maximum Flow Capacity....................................................2.0 gpm
Angle Cylinders
Stroke ..................................................................................7-5/16"
Ram Diameter........................................................................1-1/4"
Bore Diameter........................................................................1-1/2"
Lower/Raise Cylinder
Stroke ....................................................................................4-5/8"
Ram Diameter..............................................................................1"
Bore Diameter........................................................................1-3/4"
Plow Headlights
Type ......................................................Low Profile w/Turn Signals
Measurements ............................................12" W x 5"H x 5-1/4"D
Housing ..............................................................Plastic Composite
Mount ..............................................................Adjustable Ball Type
Bulb Type........High/Low Sealed Beam Halogen, 12V Rectangular
Switch Type ....................................................Dash Mount, Toggle
Miscellaneous
Plow Weight*
680LT ..................................................................Approx. 355 lb.
720LT ..................................................................Approx. 370 lb.
Amperage Draw** ........................................................Approx. 65A
Adjustable Plow Shoes................................................(2) Standard
Mount Mechanism........................................Hydraulic Power Hitch
Control Station..............................................Joystick or Touch Pad
*Plow weight does not include vehicle undercarriage.
**Amperage draw specifications are based on the snowplow lift operation, at a shop temper-
ature of 65˚F, using Blizzard Snowplow Rapid Action Hydraulic Oil. Amperage will vary with
temperature, oil viscosity and meter accuracy. Deadheading a plow function will result in
significantly increased amperage.
Unless otherwise indicated, all specifications are for the Model 680LT & 720LT straight blade
snowplows.
Blizzard Corporation reserves the right, under its Continuous Improvement Policy, to change
construction or design details and furnish equipment when so altered without reference to
illustrations or specifications.