Fisher Minute Mount 2 system User manual

February 15, 2019
Lit. No. 41298, Rev. 01
MECHANIC'S GUIDE
SNOWPLOWS
Featuring the
Isolation Module Light System
CAUTION
Read this manual before servicing the snowplow.
Insta-Act®Hydraulic System
SNOWPLOWS

Lit. No. 41298, Rev. 01 February 15, 2019
TABLE OF CONTENTS
INTRODUCTION................................................................................................5
Recommended Tools ...................................................................................5
Available Service Items ...............................................................................5
SAFETY .............................................................................................................6
SPECIFICATIONS .............................................................................................9
Insta-Act®Hydraulic System Specifications ................................................9
ATTACHING/DETACHING SNOWPLOW FROM VEHICLE ..........................10
OPERATIONAL TEST AND FINAL ADJUSTMENTS ....................................11
SYSTEM OVERVIEW ......................................................................................12
Headlamp Beam Aiming ............................................................................13
Hydraulic Hose Routing .............................................................................14
Hydraulic Unit.............................................................................................16
Hydraulic Component Installation ..............................................................17
HT Series™ Controls .................................................................................18
Hand-Held Control ..............................................................................19
SECURITY GUARD ™ Snowplow Anti-Theft System..................21
Joystick Control .................................................................................. 23
SECURITY GUARD ™ Snowplow Anti-Theft System ..................25
Hand-Held Master Control for the SECURITY GUARD™ Snowplow
Anti-Theft System.............................................................................27
THEORY OF OPERATION ..............................................................................28
Snowplow Hydraulics.................................................................................28
3-Port Module Electrical ............................................................................28
ELECTRICAL & HYDRAULIC SCHEMATICS................................................32
Legend — Electrical & Hydraulic Symbols ................................................32
Electrical Schematic — 3-Port Module..................................................... 33
Electrical Schematic — 4-Port Module......................................................37
Hydraulic Schematic ..................................................................................42
Raise — Electrical .................................................................................... 43
Raise — Hydraulic .................................................................................... 44
Lower / Float — Electrical ......................................................................... 45
Lower — Hydraulic.................................................................................... 46
Angle Right — Electrical ............................................................................47
Angle Right — Hydraulic........................................................................... 48
Angle Left — Electrical ............................................................................. 49
Angle Left — Hydraulic ............................................................................. 50
Hold in Raise Position — Hydraulic ..........................................................51
Striking an Object While Plowing — Hydraulic ..........................................52
Scrape Lock Open .................................................................................... 54
TROUBLESHOOTING GUIDE ....................................................................... 55
How To Use the Troubleshooting Guide ................................................... 55
Electrical Testing....................................................................................... 55
Before You Begin ...................................................................................... 56
Vehicle Headlamps ....................................................................................57
Snowplow Park/Turn Lamps..................................................................... 58
Snowplow DRL Lamps ............................................................................. 59
Solenoid Coil Activation Test (SCAT)........................................................ 60
Individual Solenoid Coil Test......................................................................62
Control/Cable/Plow Module Test .............................................................. 63
Motor and Motor Relay Test...................................................................... 64
Pump Pressure Test ................................................................................. 65
Blade Drop Speed Adjustment ................................................................. 66

Lit. No. 41298, Rev. 01 February 15, 2019
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Lit. No. 41298, Rev. 01 February 15, 2019
5
This guide has been prepared to assist the trained
mechanic in the service of FISHER®snowplows.
It also provides safety information and
recommendations. We urge all mechanics to read
this manual carefully before attempting to service
the FISHER snowplow equipment covered by this
guide.
Service of your FISHER snowplow equipment is
best performed by your local FISHER products
outlet. They know your snowplow best and are
interested in your complete satisfaction.
INTRODUCTION
RECOMMENDED TOOLS
• Long, slender needle nose pliers
• Flat screwdriver
• Sockets and combination wrenches:
5/16"–7/8", 1-1/16", 1-1/8"
• Deep socket: 7/8"
• 10 mm socket
• 1/4" socket or nut driver
• 12V test light
• Torque wrench (in-lb/ft-lb)
• Allen wrench set
• 600 psi pressure gauge w/adapter fittings
• 3000 psi pressure gauge
w/adapter fittings
• Flashlight
• Pick set
TORX®is a registered (®) trademark of Textron, Inc.
AVAILABLE SERVICE ITEMS
• Isolation module tester (PN 26470-2)
• Removable spring tool
(for replacing trip springs; PN 20043-1)
• Hydraulic pressure test kit (PN 56686)
• Multiplexed hydraulic diagnostic harness
(PN 29290-2)
• Motor bearing sleeve repair kit (PN 64589)
• Pump shaft seal repair kit
(PN 28856)

Lit. No. 41298, Rev. 01 February 15, 2019
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NOTE: Indicates a situation or action that can
lead to damage to your snowplow and vehicle
or other property. Other useful information can
also be described.
SAFETY
WARNING/CAUTION AND
INSTRUCTION LABELS
Become familiar with and inform users about the
warning and instruction labels on the back of the
blade.
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.
SAFETY DEFINITIONS
Warning and Caution Label
Instruction Label
OFF
ON
INSTRUCTIONS
INSTRUCTIONS
INSTRUCTIONS
INSTRUCTIONS

Lit. No. 41298, Rev. 01 February 15, 2019
7
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.
HYDRAULIC SAFETY
• Always inspect hydraulic components and
hoses before using. Replace any damaged or
worn parts immediately.
• If you suspect a hose leak, DO NOT use your
hand to locate it. Use a piece of cardboard or
wood.
WARNING
Lower the blade when the vehicle is parked.
Temperature changes could change
hydraulic pressure, causing the blade to
drop unexpectedly or damaging hydraulic
components. Failure to do this could result
in serious personal injury.
WARNING
Remove blade assembly before placing
vehicle on hoist.
WARNING
The driver shall keep bystanders clear of
the blade when it is being raised, lowered,
or angled. Do not stand between vehicle
and blade or within 8 feet of a moving blade.
A moving or falling blade could cause
personal injury.
WARNING
Do not exceed GVWR or GAWR including
blade and ballast. The rating label is found
on driver-side vehicle door cornerpost.
WARNING
To prevent accidental movement of
the blade, always turn the control OFF
whenever the snowplow is not in use. The
power indicator light will turn OFF.
WARNING
Keep hands and feet clear of the blade and
A-frame when mounting or removing the
snowplow. Moving or falling assemblies
could cause personal injury.
CAUTION
Refer to the current eMatch selection system
for minimum vehicle recommendations and
ballast requirements.
FUSES
The electrical and hydraulic systems contain
several automotive-style 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 fire. Fuse Replacement, including fuse
ratings and locations, is located in the Maintenance
section of the Owner's Manual.
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-fitting clothing while working
on your vehicle or snowplow.
• 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 fire extinguisher rated BC
handy, for flammable liquids and electrical
fires.
WARNING
Hydraulic fluid under pressure can cause
skin injection injury. If you are injured
by hydraulic fluid, get medical attention
immediately.

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TORQUE CHARTBATTERY SAFETY
NOISE
Airborne noise emission during use is below
70 dB(A) for the snowplow operator.
VIBRATION
Operating snowplow vibration does not exceed
2.5 m/s2to the hand-arm or 0.5 m/s2to the whole
body.
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 flame.
CELL PHONES
A driver's first 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.
VENTILATION
SAFETY
CAUTION
Batteries normally produce explosive
gases, which can cause personal injury.
Therefore, do not allow flames, 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.
CAUTION
Read instructions before assembling.
Fasteners should be finger tight until
instructed to tighten according to torque
chart. Use standard methods and practices
when attaching snowplow, including proper
personal protective safety equipment.
WARNING
Gasoline is highly flammable and gasoline
vapor is explosive. Never smoke while
working on vehicle. Keep all open flames
away from gasoline tank and lines. Wipe
up any spilled gasoline immediately.
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.
1/4-20 109 154
1/4-28 121 171
5/16-18 150 212
5/16-24 170 240
3/8-16 269 376
3/8-24 297 420
7/16-14 429 606
7/16-20
9/16-12
9/16-18
5/8-11
5/8-18
3/4-10
3/4-16
7/8-9
7/8-14 474 669
644 9091-8
1-12 704 995
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 2.00 231 167
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

Lit. No. 41298, Rev. 01 February 15, 2019
9
Electrical System – approx. values:
• Solenoid Coil Resistance = 7 ohm at room
temperature
• Solenoid Coil Amperage Draw = 1.5A
• Motor Relay Coil Resistance = 16–17 ohm
• Motor Relay Amperage Draw = 0.7A
• Motor Amperage Draw = 100A at 1650 psi ±
50 psi
• Switched Accessory Lead Draw = 0.75A
SPECIFICATIONS
AeroShell®is a registered (®) trademark of Shell Oil Company.
HT Series™ Insta-Act®HYDRAULIC SYSTEM SPECIFICATIONS
Pump Cap Screws 5/16-18 x 2 150-160 in-lb
Motor Terminals (+ and –) M6 Nut 25-35 in-lb
Motor to Manifold Cap Screws M5 30-40 in-lb
Reservoir Screws #10-24 x 5/16 30-35 in-lb
Solenoid Valves 7/8 Hex Head 19-21 ft-lb
Coil Nuts 3/4 Hex-Head Jam Nut 40-60 in-lb
SAE O-Ring Plugs 1/8 or 5/32 Internal Hex 55-65 in-lb
Hydraulic Unit Mount Bolts 3/8-16 x 1 25-33 ft-lb
Check Valves 7/8 Hex Head 19-21 ft-lb
Motor Relay Small Terminals #10-32 Nut 15 in-lb max
Motor Relay Large Terminals 5/16-24 Nut 35 in-lb max
Motor Relay Mount Screws 1/4-20 x 1/4 60-70 in-lb
Plow Module Mount Screws 1/4-20 x 5/8 60-70 in-lb
Angle Ram Gland Nuts 150-180 ft-lb
Fastener Torque
NOTE: Remove breather/fill plug slowly to
relieve any pressure in reservoir.
Hydraulic Fluid
• FISHER®EZ Flow Hydraulic Fluid to
–40°F (–40°C) or other fluid conforming to
Military Specification MIL-H-5606A, such as
Mobil Aero HFA or Shell AeroShell®Fluid 4.
Fluid Capacity
• Unit Reservoir = 1-1/2 quarts
• System Total = 2-1/4 quarts
Solenoid Valve Spool Travel = 0.07" for 3- and
4-way valves (S2, S3). Travel of 2-way valve (S1)
spool is not detectable with voltage applied to coil.
CAUTION
Do not mix different kinds of hydraulic
fluid. Some fluids are not compatible and
may cause performance problems and
product damage.
3-Port Module
Vehicle Control Harness Fuse Size
• Park/Turn – 10A (Mini)
• Control – 10A (Mini)
4-Port Module
(automotive-style)
• Park/Turn – 15A
• Control – 7.5A

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ATTACHING/DETACHING SNOWPLOW FROM VEHICLE
OFF
ON
PU
S
H
Jack (raised)
Jack Lock
Pin Release
Handle (raised)
Headgear Push Bar
Headlamp Bracket
Pushplate
Jack
(lowered)
Jack Retract
Lever
Jack Lock
Pin Release
Handle (lowered)
Attachment
Arm
Connecting Pin
HT Series™ ATTACH/DETACH DIAGRAM
NOTE: After each use of the snowplow, reapply
dielectric grease to the electrical plugs to
maintain the protective coating on the terminals.
NOTE: Multiplexed 2-plug systems are
equipped with plug covers.

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11
2. Turn the quill IN (clockwise) to decrease drop
speed. Turn the quill OUT (counterclockwise)
to increase drop speed.
3. Stand 8' clear of the blade when checking
adjustment.
OPERATIONAL TEST AND FINAL ADJUSTMENTS
FILLING HYDRAULIC UNIT
1. Attach the snowplow to the vehicle according to
the instructions on the back of the blade.
The HT Series™ snowplow hydraulic system
comes pre-assembled, filled, and fully tested
from the factory.
2. Remove factory installed pipe plug. Reservoir
fluid level should be within 2-1/2" from the top of
the fill hole. If additional fluid is needed, fill the
reservoir with FISHER®EZ Flow Hydraulic Fluid
to –40°F (–40°C), or other fluid conforming to
Military Specification MIL-H-5606A, such as
Mobil Aero HFA or Shell AeroShell®Fluid 4.
3. Replace with breather/fill plug (included in
parts box).
WARNING
Keep 8' clear of the blade when it is being
raised, lowered, or angled. Do not stand
between the vehicle and blade or directly
in front of blade. If the blade hits or drops
on you, you could be seriously injured.
WARNING
To prevent accidental movement of
the blade, always turn the control OFF
whenever the snowplow is not in use. The
power indicator light will turn OFF.
CAUTION
Do not mix different types of hydraulic
fluid. Some fluids are not compatible and
may cause performance problems and
product damage.
FLUID CAPACITY
• Insta-Act®Unit Reservoir 1-3/4 qt
• Insta-Act System Total 2-3/8 to 2-3/4 qt
Drain
Plug
Breather/Fill Plug
BLADE DROP SPEED ADJUSTMENT
The quill in the valve manifold adjusts the blade
drop speed.
1. Lower the blade to the ground before making
adjustment.
WARNING
Keep 8' clear of the blade when it is being
raised, lowered, or angled. Do not stand
between the vehicle and blade or directly
in front of blade. If the blade hits or drops
on you, you could be seriously injured.
Quill
FINAL ADJUSTMENTS
1. With the snowplow attached to the properly
ballasted vehicle and the blade lowered to the
ground, the A-frame should be parallel with the
ground.
2. Fully angle the blade in raised and lowered
positions. Adjust hose fittings and wraps so
that hoses do not contact vehicle bumper, have
no sharp bends, and are wrapped at contact
points with headgear and blade.

Lit. No. 41298, Rev. 01 February 15, 2019
12
SYSTEM OVERVIEW
VEHICLE LIGHTING CHECK
1. Verify the operation of all vehicle front lighting
prior to connecting the snowplow harness.
2. Check the operation of the snowplow lights
with snowplow mounted to vehicle and all
harnesses connected.
Turn signals and parking lamps
Move vehicle headlamp switch to the parking
lamp "ON" position.
Parking lamps ON:
• Both vehicle and snowplow parking lamps
should be ON at the same time.
Driver-side turn signal ON:
• Both vehicle and snowplow driver-side turn
signal lamps should flash at the same time.
Passenger-side turn signal ON:
• Both vehicle and snowplow passenger-side
turn signal lamps should flash at the same
time.
Headlamps
Move vehicle headlamp switch to the "ON"
position. Connecting and disconnecting the
headlamp harness plug should switch between
vehicle and snowplow headlamps as follows:
Headlamp harness plug DISCONNECTED:
• Vehicle headlamps/parking lamps should be
ON.
• Snowplow headlamps/parking lamps should
be OFF.
Headlamp harness plug CONNECTED:
• Snowplow headlamps/parking lamps should
be ON.
• Vehicle headlamps should be OFF.
Dimmer switch should dim whichever
headlamps are operating. The high beam
indicator on the dash should light when either
set of headlamps is on high beam.
Daytime Running Lamps (DRLs)
for PN 29070-1:
With the dedicated DRLs on the truck turned
ON, the snowplow turn signals will turn ON.
If DRLs are in high or low beam filament when
the snowplow is attached, the corresponding
snowplow lamps will turn ON.
Joystick Control or Fish-Stik®Hand-Held
Control
The control indicator light should light whenever
the control ON/OFF switch and the ignition
(key) switches are both in the "ON" position.
The snowplow plugs do need to be connected
to the vehicle harness connectors.
3. Check aim of vehicle headlamps with
snowplow removed.
4. Connect all snowplow and vehicle harnesses.
Raise the snowplow and aim snowplow
headlamps according to the Snowplow
Headlamp Beam Aiming instructions included
with the headlamps and any state or local
regulations.
5. When the snowplow is removed from the
vehicle, install plug covers on the vehicle battery
cable and lighting harness. Insert the snowplow
battery cable and lighting harness into the cable
boot on the snowplow.
CAUTION
On 2-plug electrical systems, plug covers
shall be used whenever snowplow is
disconnected. Vehicle battery cable is
12V unfused source.

Lit. No. 41298, Rev. 01 February 15, 2019
13
SYSTEM OVERVIEW
HEADLAMP BEAM AIMING
Torque headlamp fasteners to 45 ft-lb once correct
visual aim is achieved.
1. Place vehicle on a level surface 25 feet in front
of a matte-white screen, such as a garage
door. The screen should be perpendicular both
to the ground and to the vehicle centerline.
2. The vehicle should be equipped for normal
operation. The snowplow blade should be in
place and in raised position. Below are steps
listed by the Society of Automotive Engineers
(SAE) pertinent to headlamp aiming in
specification #SAE J599d.
3. Prepare vehicle for headlamp aim or
inspection. Before checking beam aim, the
inspector will:
a. Remove ice or mud from under fenders.
b. Set tire inflation pressures to the values
specified on vehicle information label.
c. Check springs for sag or broken leaves.
d. See that there is no load in the vehicle other
than the driver and ballast as specified in
the eMatch selection system.
e. Check functioning of any automatic
vehicle leveling systems and specific
manufacturer's instructions pertaining to
vehicle preparation for headlamp aiming.
f. Clean lenses.
g. Check for bulb burnout and proper beam
switching.
h. Stabilize suspension by rocking vehicle
sideways.
Vertical centerline ahead of
DS snowplow headlamp
Align with vehicle
centerline Vertical centerline ahead of
PS snowplow headlamp
Screen located 25 feet
from snowplow headlamps
Horizontal centerline
of snowplow headlamps
High-intensity zones of snowplow
headlamps on low beam
4. Mark (or tape) the vertical centerline of
the snowplow headlamps and the vertical
centerline of the vehicle on the screen. Mark
the horizontal centerline of the snowplow
headlamps on the screen (distance from
ground to snowplow headlamp centers).
5. Align the top edge of the high intensity zone
of the snowplow lower beam below the
horizontal centerline and the left edge of the
high intensity zone on the vertical centerline for
each snowplow headlamp. (Refer to diagram.)

Lit. No. 41298, Rev. 01 February 15, 2019
14
SYSTEM OVERVIEW – HYDRAULIC HOSE ROUTING
To DS
Angle Ram
To PS
Angle Ram
To Lif t
Ram Base
To Lif t
Ram Rod
HOSE ROUTING FOR HT Series™ BLADES
PS Ram
DS Ram
To Lif t Ram
Rod
To DS Ram
To PS Ram
To Lif t Ram Base

Lit. No. 41298, Rev. 01 February 15, 2019
15
SYSTEM OVERVIEW – HYDRAULIC UNIT
Insta-Act®HYDRAULIC UNIT
The HT Series™ hydraulic unit has blade scrape
lock circuitry built in. This feature is activated when
the blade is in FLOAT. The HT Series blade is
raised in approximately 4 seconds and angled side
to side in approximately 3 seconds.
Drain Plug
Quill
Reservoir
Valve Manifold
Breather/
Fill Plug
Motor
Sleeve Bearing
Pump Shaft Seal
Scrape Lock
Bypass Check Valve
Pump Pressure
Breather
Reservoir
O-Ring
Drain Plug
Suction Filter
Pump
Quill
PS Crossover Relief Valve
Solenoid Cartridge Valve
Solenoid Coil
Coil Nut
Poppet Check Valve Kit
Check Valve
Crossover Relief Valve
Valve Manifold Block
Motor
Magnet
Plate Baffle
Retainer Clip
Inlet Fitting

Lit. No. 41298, Rev. 01 February 15, 2019
16
SYSTEM OVERVIEW – HYDRAULIC UNIT
SOLENOID CARTRIDGE VALVE IDENTIFICATION
& LOCATION
S2 S3
Solenoid Cartridge Valves
S1
Relief Valve
Scrape Lock
Pump Relief
Valve
PS Plowing
Relief Valve
DS Plowing
Relief
Valve
RELIEF VALVE IDENTIFICATION & LOCATION

Lit. No. 41298, Rev. 01 February 15, 2019
17
Excerpts taken from UltraMount®2 Owner's Manual (Lit. No. 43181, Rev. 01).
HYDRAULIC COMPONENT INSTALLATION
SYSTEM OVERVIEW – HYDRAULIC
Ram Seal Installation
1. Lubricate O-rings before assembly.
2. Assemble gland components as shown, then
lubricate.
3. Remove piston from rod and assemble piston
components as shown.
4. Assemble gland to threaded end of rod. Do not
slide gland over cross hole in rod.
5. Reassemble piston to rod and tighten nut to
100–120 ft-lb.
6. Assemble O-ring into groove on rod. Use tape
or other protection on threads.
7. Apply bead of medium-strength threadlocker
all around threads of gland.
8. Lubricate piston seals and inside of cylinder.
9. Press rod assembly into cylinder and tighten
gland to 30–40 ft-lb.
It is possible to remove cartridges and check
valves from a hydraulic unit without draining the
hydraulic fluid from the reservoir.
1. Install the Diagnostic Harness (PN 29290-2)
following the instructions included with the kit.
Seal Position
Gland
Back-Up Ring
Wiper
Seal O-Ring
Wear Ring
Inner
Backing
Ring
Outer
Seal
Wear
Ring
Nut
Groove in Rod
Rod
Gland
Piston
Cylinder
2. Cycle through the control functions twice to
remove the pressure in the hydraulic unit.
3. Slowly remove the breather from the top of the
hydraulic unit.
4. Either (a) completely drain reservoir and skip
to Step 9 or (b) proceed with instructions
for removing hydraulic components without
completely draining reservoir.
5. Install a 3/8" barb fitting into the top of the
reservoir tank.
6. Attach a hand-operated vacuum pump to the
barb fitting.
7. Using the vacuum pump, pull a vacuum of
approximately 5"–10" Hg.
8. You should now be able to remove cartridges
and check valves from the hydraulic unit with
minimal fluid loss. Maintain the vacuum until
the replacement cartridge/check valve has
been installed. Once the replacement part
has been installed, release the vacuum and
remove the 3/8" barb fitting.
9. Reinstall the breather and remove the
29290-2 Diagnostic Harness according to the
instructions included with the kit.
Cartridge & Check Valve Removal

Lit. No. 41298, Rev. 01 February 15, 2019
18
SYSTEM OVERVIEW – HT Series™ CONTROLS
Power Indicator
Light (red)
ON/OFF Button
(emergency stop)
ON/OFF Switch
(emergency stop
on side of control)
Hand-Held Control
Joystick Control

Lit. No. 41298, Rev. 01 February 15, 2019
19
CONTROL OVERVIEW
The SECURITY GUARD feature was developed
as an electrical anti-theft system for the half-ton
snowplows. The system provides a deterrent from
theft and/or non-permitted use by allowing you
to electronically lock the snowplow's hydraulic
functions.
All half-ton snowplow controls come equipped
with the SECURITY GUARD system. To use this
function, you must complete the steps under the
"Activation & Establishing a 4-Digit Security Code"
section later in this guide.
HAND-HELD CONTROL WITH SECURITY GUARD™ SNOWPLOW ANTI-THEFT SYSTEM
Before Activating the
SECURITY GUARD System:
Install the control as stated in the Hand-Held
Control Kit Installation Instructions, and check all
snowplow functions as described below.
OPERATING THE HAND-HELD
CONTROL
1. Turn the vehicle ignition switch to the "ON" or
"ACCESSORY" position.
2. Press the ON/OFF button on the control. The
power indicator light glows red, indicating the
control is ON. The power indicator light glows
red whenever the control and the vehicle
ignition switch are both ON and the electrical
connections to the snowplow are completed.
The ON/OFF button operates as an
emergency stop if required.
WARNING
To prevent accidental movement of the
blade, always push the ON/OFF button
to switch the control OFF whenever
the snowplow is not in use. The power
indicator light will turn OFF.
RAISE
LOWER
R
L
ON/OFFFLOAT
1
43
2
Power Indicator
Light (red)
ON/OFF
Button
(emergency
stop)
FLOAT Light
(green)
Function Time-Outs
All control functions, except LOWER/FLOAT, time
out (stop) automatically after a period of time. This
is to limit the amount of electrical energy required
from the vehicle.
NOTE: If control function times out before
desired blade movement is complete, release
button and press again.
Automatic Shutdown
The control will automatically turn OFF after being
idle for 20 minutes. To reactivate the control after a
shutdown, press the ON/OFF button.
Each control is equipped with an ON/OFF switch
and an indicator light to show when the control is
powered ON or OFF. The controls are powered by
the vehicle's battery, so your vehicle ignition (key)
switch must be ON to use the controls.

Lit. No. 41298, Rev. 01 February 15, 2019
20
HAND-HELD CONTROL WITH SECURITY GUARD™ SNOWPLOW ANTI-THEFT SYSTEM
Smooth Stop
The control automatically allows the blade to coast
to a stop when the button is released. This results
in smoother operation, reduces the shock to the
hydraulic system, and increases hose and valve
life.
Control Functions
Raise, Lower, Float, Angle
The four diamond-shaped buttons in the center of
the control face, when pressed, will result in the
blade movements described in the table.
Function Description of Operation
RAISE
Press this button to raise the snowplow and
cancel the FLOAT mode. Function times out
after 4.8 seconds.
LOWER
Press this button to lower the snowplow.
Release the button to stop blade at desired
height.
FLOAT
Press the LOWER button and hold 3/4 second
to activate this mode. The FLOAT light in
the upper left corner of the control face will
illuminate. The blade will lower to the ground
surface and follow the contour of the surface
as it dips or raises. Function does not time out,
but control will shut down after 20 minutes of
nonuse.
Press RAISE button momentarily to cancel
FLOAT. Angling left or right will not interrupt
(stop) the FLOAT function.
L
(Angle
Left)
Press this button to angle the blade to the left.
Function times out after 9.6 seconds.
R
(Angle
Right)
Press this button to angle the blade to the
right. Function times out after 9.6 seconds.
1 & 4 Used to access the SECURITY GUARD
system activation mode.
2 & 3 Used to clear the entered SECURITY GUARD
system code.
NOTE: If control function times out before desired
blade movement is complete, release button and
press again.
RAISE
LOWER
R
L
ON/OFFFLOAT
1
43
2
FLOAT Light
(green)