Hiniker 2751 User manual

STRAIGHT PLOW
Model Years 1996-1999
Electrical Troubleshooting Guide For
Models 2751, 2851, 2801, 2901
DO NOT USE OR OPERATE THIS EQUIPMENT UNTIL THIS MANUAL
HAS BEEN READ AND THOROUGHLY UNDERSTOOD
PART NUMBER 39300026 Rev. B

TITLE
Foreword
FOREWORD
This guide is intended to assist the trained
dealer mechanic in the repair of Hiniker Com-
pany snowplows. While it provides schematics,
tables, and other documentation, it is not a train-
ing manual and should not be considered a sub-
stitute for proper training in electrical, hydraulic,
or mechanical repair. Above all, it should not be
considered as a substitute for experience and
common sense.
The information in this guide has been checked
and is believed to be accurate. Hiniker Com-
pany, however, assumes no responsibility for
any errors, omissions, or other inaccuracies,
which may appear in this document or for any
damage or expense resulting from them. Nor
does Hiniker Company make any commitment
to update the information contained herein but
reserves the right to make changes at any time
without prior notice.
Hiniker Company reserves the right under its
product improvement policy to discontinue
equipment, or to change construction or design
details and furnish equipment when so altered
without reference to the illustrations or specica-
tions contained herein.
Trucks intended to be equipped with a snowplow
must comply with the vehicle manufacturer’s
specications for snowplow applications. Check
with the vehicle dealer for information on snow-
plow package availability, contents, and any ad-
ditional recommended options.

TITLE
TABLE OF CONTENTS
39300026 Rev. B 12/09 Manual/39300026RevB
INTRODUCTION..................................................................................................... 1
SAFETY ...............................................................................................................2-3
PLOW IDENTIFICATION ........................................................................................ 4
THEORY OF OPERATION...................................................................................5-6
INITIAL INSPECTION............................................................................................. 7
MOLDBOARD PROBLEMS ..............................................................................8-18
Will Not Angle Right........................................................................................... 8
Will Not Angle Left............................................................................................. 9
Will Not Raise.................................................................................................. 10
Will Not Lower..................................................................................................11
Constantly Angles Left..................................................................................... 12
Constantly Angles Right.................................................................................. 13
Operates Slowly.............................................................................................. 14
Will Not Stay Raised........................................................................................ 15
Will Not Hold Angle.......................................................................................... 15
Pump Will Not Run.......................................................................................... 16
No Plow Power................................................................................................ 17
No Controller Power........................................................................................ 18
LIGHTING PROBLEMS...................................................................................19-28
No Lights On Truck And Plow OK..............................................................19-20
No High Beam(s) On Truck And Plow OK...................................................... 20
No Low Beam(s) On Truck And Plow OK....................................................... 21
No Lights On Plow And Truck OK..............................................................22-23
No High Beam(s) On Plow And Truck OK...................................................... 24
No Low Beam(s) On Plow And Truck OK....................................................... 25
No Parking Lights On Plow ............................................................................. 26
No Left Turn Signal On Plow........................................................................... 26
No Right Turn Signal On Plow......................................................................... 27
No Lights On Truck And No Lights On Plow................................................... 28
LIGHTING CONVERSIONS.............................................................................29-32
General............................................................................................................ 29
99 Dodge Dual, P/N 25010617 ..................................................................29-30
99 Dodge Quad, P/N 25011011 .................................................................30-31
99 GM Quad, P/N 25010616........................................................................... 32
Table of Contents

Table of Contents
TEST PROCEDURES......................................................................................33-43
Hydraulic Solenoid .....................................................................................33-34
Motor Solenoid................................................................................................ 35
Controller......................................................................................................... 36
Under Hood Harness..................................................................................37-39
Plow Harness.............................................................................................40-41
Plow Headlight ...........................................................................................42-43
CIRCUIT DESCRIPTIONS...............................................................................44-56
REFERENCE ...................................................................................................57-77
Special Problems ............................................................................................ 57
Company Information...................................................................................... 58
Lighting Adapter Application Chart.............................................................58-59
Lighting Adapters........................................................................................60-63
Ground Switch Converters.........................................................................64-65
Hydraulic Solenoid Table................................................................................. 66
Power Unit Drawing......................................................................................... 66
Hydraulic Schematic........................................................................................ 67
Hydraulic Oil Selection Chart .......................................................................... 68
Hydraulic Solenoids......................................................................................... 69
Motor Solenoids .............................................................................................. 70
Spike Suppressors.....................................................................................71-72
Relays ............................................................................................................. 73
Relay Connections.......................................................................................... 74
Straight Plow Wiring Diagram ......................................................................... 75
Lighting Connectors ........................................................................................ 76
Harness Connectors........................................................................................ 77
System Schematic..............................................................................Back Page

TITLE
Introduction 1
INTRODUCTION
Thissection guidesyouthroughstepbysteppro-
cedures designed to help troubleshoot electrical
problems you might encounter while repairing
or installing a Hiniker straight plow, model years
1996 - 1999. It is intended to be used by quali-
ed service technicians at the dealer level.
This guide contains the following basic types of
information:
• Troubleshooting Procedures
• Testing Procedures
• Electrical Schematics
• Hydraulic Schematics
• Reference Information.
Troubleshooting procedures for various prob-
lems are listed in the table of contents. Select
the one that is closest to your situation. Many
problems overlap each other. If there was no
moldboard movement at all you could select
“PLOW WILL NOT ANGLE LEFT” as the prob-
lem.
The troubleshooting procedures are laid out in
a text based owchart form. Following the guide
consists of performing an action and checking
what happened (See below). For a “No” answer,
go down the left side of the page to the next ac-
tion. “Yes” answers have the next action directly
below them.
Perform action 1.
DID THIS HAPPEN?
No. Yes.
| Perform action 3.
| DID THIS HAPPEN?
| No. Yes.
| | Replace this.
| |
| Perform action 4.
| DID THIS HAPPEN?
|
Perform action 2.
Some of the actions performed are xed test
procedures covering the controller, under hood
harness, and plow harness. The troubleshooting
procedure is geared toward the problem you se-
lected. As an example:
If you have a “PLOW WILL NOT ANGLE LEFT”
problem and the under hood harness fails the
under hood harness test, it is assumed that it
failed because of “PLOW WILL NOT ANGLE
LEFT” problem. The trouble shooting procedure
will then focus on the part of the under hood har-
ness responsible for angle left movement.
Most test procedures require the use of the
Hiniker Snowplow Electrical System Tester part
# 36014014. The tester helps in quickly locating
problems with the system wiring and is required
for performing these tests. The tester is avail-
able from Hiniker Co.
During all testing, the plow should be resting on
the ground. When testing out by the plow, the
two-conductor power cable should be unplugged
at the grill. This will prevent any movement of
the plow and any risk of the plow causing harm
to anyone nearby.
Pull straight out on connectors when unplug-
ging, Do Not Twist. Before plugging connectors
together line them up with the notch or stripe lo-
cated on the connector
During testing it is good practice to check all
wires and connections for any kind of damage.
Corrosion can cause intermittent connections, it
is recommended that dielectric grease be used
on all harness connections.
Power should always be removed from the cir-
cuit that you will be testing before you unplug
or plug any connections.

TITLE
SAFETY INFORMATION
Operator safety is a principle concern in the de-
sign and distribution of equipment. Many ac-
cidents can be avoided by taking the time to
become familiar with the equipment and how to
operate it safely.
Do not use or operate any equipment until the
Operators Manual has been read and thorough-
ly understood.
This is the safety alert symbol. It alerts
an operator to instructions concerning
personal safety. Always read and fol-
low the instructions. Failure to do so could
result in serious injury or death.
Along with the safety alert symbol is a signal
word. It will be the word “CAUTION”, “WARN-
ING”, or “DANGER”. These signal words are
dened as follows.
CAUTION -A reminder for proper safety prac-
tices and directs attention to following them.
Equipment decals of this class are yellow
and black.
WARNING - A reminder for proper safety
practices and what can happen if they are
ignored. This has a more serious conse-
quence than CAUTION. Equipment decals of
this class are yellow and black.
DANGER - Denotes the most serious safety
hazard. It is a reminder for observing the
stated precautions and what can happen if
they are ignored. Equipment decals of this
class are red and white.
CAUTION: For your protection we
strongly recommend that you read,
understand, and heed the following
information.
1. If the operator’s manual is lost or missing
from any Hiniker equipment contact Hiniker
to obtain a replacement.
2. Read the operators manual thoroughly.
Make sure that you understand and know
how to safely operate the equipment. Snow-
plows can kill or injure an untrained or care-
less operator.
3. Do not attempt to service any equipment un-
less you know how to do it safely.
4. Do not be in a hurry. Take time to ensure
proper procedures have been followed.
PAY SPECIAL ATTENTION TO THE FOLLOW-
ING:
ALWAYS inspect lift system bolts and pins when-
ever attaching or detaching the plow, and before
traveling. Worn or damaged components could
result in the plow dropping while driving, causing
an accident.
NEVER place ngers in mounting holes to check
alignment. Sudden shifting of the plow could se-
verely injure a nger.
NEVER stand between the vehicle and mold-
board or directly in front of the moldboard when
it is being operated. Clearance between the
moldboard and vehicle changes as the mold-
board is operated. Serious injury can result from
the moldboard striking a body or dropping on
hands or feet.
NEVER work on the vehicle without having a
fully charged re extinguisher available. A 5 lb.
or larger CO2 or dry chemical unit specied for
gasoline, chemical, or electrical res is recom-
mended.
NEVER smoke while working on the vehicle.
Gasoline and battery acid vapors are extremely
ammable and explosive.
ALWAYS operate the vehicle in a well-ventilated
area. The carbon monoxide in exhaust fumes
is highly toxic. It can cause serious injury or
death.
2 Safety

Safety 3
NEVER allow hands, hair, or clothing to get near
any moving parts such as fan moldboards, belts,
and pulleys. Never wear neckties or loose tting
clothing when working on the vehicle.
NEVER wear wristwatches, rings, or other jewel-
ry when working on the vehicle. They can catch
on moving parts or cause an electrical short that
could result in serious personal injury.
ALWAYS wear suitable eye protection when
working on the vehicle to protect from battery
acid, gasoline, and dirt thrown from moving en-
gine parts.
ALWAYS be aware of and avoid contact with hot
surfaces such as engine, radiator, and hoses.
ALWAYSwearsuitableeyeprotectionwhenstrik-
ing metal against metal. It is recommended that
a softer, non-chipping metal be used to cushion
the blow.
NEVER use your hands to check for hydraulic
uid leaks. Escaping uid under pressure can
be invisible and can penetrate the skin and can
cause serious injury. If any uid is injected into
the skin, see a doctor at once. A doctor familiar
with this type of injury must surgically remove
the injected uid or gangrene may result.
ALWAYS make sure the vehicle is parked on sol-
id, level ground and the plow moldboard is down
when not being operated.
ALWAYS unplug the two conductor power cable
at the grill when performing tests on the plow
harness, motor solenoid, hydraulic solenoids, or
any time you need to work on the moldboard.

TITLE
4 Plow Identification
PLOW IDENTIFICATION
The plow model # is located on the back, left
side of the moldboard. Use it with the chart be-
low to identify the model year.
Model# Year Type * Width
700 2005 S 7’
1850 1999 V 8.5’
1851 2000 V 8.5’
1852 2006 DAV 8.5’
1951 2000 V 9.5’
1952 2006 DAV 9.5’
2750 1995 S 7.5’
2751 1996-99 S 7.5’
2752 2000 S 7.5’
2800 1995 S 8’
2801 1996-99 S 8’
2802 2000 S 8’
2851 1996-99 S 8.5’
2852 2000 S 8.5’
2901 1996-99 S 9’
2902 2000 S 9’
3800 2000 C 8’
6800 2000 Scoop 8’
6900 2000 Scoop 9’
7800 2000 S 8’
7801 2000 S 8’
7900 2000 S 9’
7901 2000 S 9’
8800 2000 C 8’
8801 2000 C 8’
8900 2000 C 9’
8901 2000 C 9’
9850 2007 DAV 8.5’
9950 2007 DAV 9.5’
10321 2008 S 10’
10322 2008 S 10’
* C - C - Moldboard Plow
DAV - Dual Acting Vee Moldboard Plow
S - Straight Moldboard Plow
V - Single Acting Vee Moldboard Plow
1995 - This was the rst year for Hiniker plows. Only
straight plows were manufactured. The plow con-
troller used up/down and left/right rocker switches
to control the moldboard. The under hood harness
had one large relay for switching headlights from
truck to plow. Plugging the plow into the grill con-
nector would cause the headlights to switch to the
plow. The wiring of the under hood harness was
covered by tightly woven, black, webbed loom.
The motor solenoid for this year had three termi-
nals and was mounted out on the plow pump mo-
tor.
1996-99 - Straight plows were manufactured dur-
ing this period, with the V plow being added in
1999. The straight plow controller used a joystick
style switch to control moldboard movements.
The V plow controller used the same joystick style
switch with the addition of two pushbuttons. The
under hood harness had a black box with a fuse
and two relays mounted on it. The wiring consisted
of gray cables. The motor solenoid had three ter-
minals and was mounted under the vehicle hood.
The automatic headlight switching system was re-
placed with a slide switch on the controller and a
power switch was also added.
2000 - Straight, Scoop, V, and C plows were man-
ufactured with the Scoop and C plow being new
for 2000. All four plows use a custom molded,
black plastic case with a joystick style switch and
additional pushbuttons where needed. The under
hood harness has a cluster of three relays for high
beams, low beams, and power switching. The wir-
ing is covered by black plastic corrugated loom.
The motor solenoid is mounted under the hood
and has a separate ground terminal added for a
total of four.
2006 - The V Plow was changed from a SingleAct-
ing hydraulic cylinder V plow to a Dual Acting hy-
draulic cylinder V plow. In a Single Acting V plow,
the wings are retracted by having the left and right
retract solenoids bleed off the hydraulic uid, al-
lowing the wings to retract under spring tension.
In a DualActing V plow, the wings are retracted by
turning on the hydraulic oil pump and having the
left and right retract solenoids route the pumped oil
to the front of the wing cylinders. This causes the
wings to retract under hydraulic pressure rather
than spring tension.

TITLE
Theory of Operation 5
THEORY OF OPERATION
MOLDBOARD MOVEMENTS
Over View
Pushing the joystick to one of the moldboard
movement positions causes the controller to
send +12 volts out to the appropriate solenoid(s)
that interface with the hydraulic system. This,
in turn, causes the movement to be performed.
The solenoids are as follows:
Motor Solenoid - This controls the hydraulic
pump motor, which pumps hydraulic oil.
Down Solenoid - This bleeds off the hydraulic
oil in the up cylinder causing the moldboard to
lower.
Left Solenoid - This changes the ow path of
pumped hydraulic oil. Instead of going to the up
cylinder, the ow is sent to the left cylinder.
Right Solenoid - This changes the ow path of
pumped hydraulic oil. Instead of going to the up
cylinder, the ow is sent to the right cylinder.
Raise Movement
To raise the plow, the controller simply turns on
the motor solenoid. With both the left and right
solenoid off, oil is pumped into the up cylinder,
raising the moldboard. When the joystick is re-
leased, a check valve prevents the oil from ow-
ing backward to the oil tank. A raise movement
will also cause the controller to turn off the down
solenoid if the moldboard was in oat mode.
Lower Movement
To lower the plow, the controller turns on the
down solenoid. This bleeds the oil from the up
cylinder, back into the oil tank as the weight of
the plow moldboard pushes against it. When this
movement is performed the down solenoid is
latched on, also called oat mode, so that the
moldboard can rise and fall with the surface be-
ing plowed. A raise movement will turn off the
down solenoid and cancel the oat mode.
Moldboard Left Movement
To perform a moldboard left movement the con-
troller turns on both the motor solenoid and the
moldboard left solenoid. With the moldboard left
solenoid on, the oil, instead of going to the up
cylinder, is sent to the moldboard left cylinder.
The cylinder extends pushing the right side of
the moldboard forward which angles the mold-
board left. The moldboard left movement also
supplies a bleed back path for the oil in the mold-
board right cylinder so that it can collapse.
Moldboard Right Movement
To perform a moldboard right movement the con-
troller turns on both the motor solenoid and the
moldboard right solenoid. With the moldboard
right solenoid on, the oil, instead of going to the
up cylinder, is sent to the moldboard right cylin-
der. The cylinder extends pushing the left side of
the moldboard forward, which angles the mold-
board right. The moldboard right movement also
supplies a bleed back path for the oil in the mold-
board left cylinder so that it can collapse.

6 Theory of Operation
PLOW LIGHTING
Over View
The purpose of the plow lighting system is to
control the normal vehicle lighting functions and
extend them out to the top of the plow where
they will not be blocked by the plow moldboard.
Head Lights
In order to control the headlights the connec-
tion between the existing vehicle wiring and the
headlights is broken. Lighting adapters are then
used to match the under hood harness to the
various types of vehicle lighting systems.
The under hood harness uses a high and low
beam relay to switch the headlights to either
TRUCK or PLOW depending on the light selec-
tion switch on the controller. Disconnecting the
controller will automatically switch the lights to
the truck.
Parking Lights
The parking lights for the plow are tapped from
the existing vehicle wiring using a quick connect
bullet receptacle. The receptacle mates with the
parking light bullet connector coming from the
under hood harness. It does not change the nor-
mal operation of the vehicle parking lights.
Turn Signals
The left and right turn signals for the plow are
tapped from the vehicle turn signal wiring using
quick connect bullet receptacles. The recepta-
cles mate with the turn signal bullet connectors
coming from the under hood harness. It does not
change the normal operation of the vehicle turn
signals.

TITLE
Step Action
1. Personally observe how, and when, the problem occurs on the customer’s plow.
2. Make sure vehicle is on a solid, level surface, in park, and parking brake is set.
3. Lower plow moldboard before servicing any part of hydraulic or electrical system.
If moldboard will not lower then support it with a oor jack or other suitable means.
4. Insure battery is fully charged.
5. Insure battery terminals and connections are clean, corrosion free, and tight.
6. Insure battery ground to vehicle frame is clean, corrosion free, and tight.
7. Insure alternator belt is in good condition.
8. Insure alternator belt has correct tension.
9. Verify alternator provides 13.6 volts minimum with the engine running and no accessories on.
10. Verify that capacity of alternator meets minimum requirements for operating the snowplow.
11. Insure snowplow ground and power connections are clean, corrosion free, and tight.
12. Check harness connectors for corrosion, dirt, damage, or pushed pins or sockets that do not
fully connect.
13. Check fuses and circuit breakers in the system for the need to be replaced or reset.
14. Verify that the correct hydraulic uid is being used in the unit and that it is adequately lled.
CAUTION! NEVER use your hands to search for hydraulic uid leaks. Use a piece of paper or wood.
15. Check all hoses and cylinders for proper condition and leaks.
Initial Inspection 7
INITIAL INSPECTION
The initial inspection is intended to eliminate
system problems that could occur and should
be performed prior to any troubleshooting. The
troubleshooting procedures assume that the
initial inspection has been performed and will
not address system problems such as a low hy-
draulic uid level.

TITLE
8 Moldboard Problems
MOLDBOARD PROBLEMS
PLOW WILL NOT ANGLE RIGHT
Perform angle right.
DID PUMP MOTOR RUN?
No. Yes.
| Perform Controller Test Procedure.
| DID CONTROLLER TEST OK?
| No. Yes.
| | Perform Under Hood Harness Test Procedure.
| | DID UNDER HOOD HARNESS TEST OK?
| | No. Yes.
| | | Perform Plow Harness Test Procedure.
| | | DID PLOW HARNESS TEST OK?
| | | No. Yes.
| | | | Locate right hydraulic solenoid (See Power Unit Drawing).
| | | | Perform Hydraulic Solenoid Test Procedure.
| | | | DID RIGHT SOLENOID TEST OK?
| | | | No. Yes.
| | | | | Hydraulic problem (See Hydraulic Unit Service Manual).
| | | | |
| | | | Replace right solenoid (See Hydraulic Unit Service Manual).
| | | |
| | | Check ORANGE wire from J1 - 4 (plow harness) to right solenoid.
| | | DID THIS FIND THE PROBLEM?
| | | No. Yes, done.
| | | |
| | | See Special Problems.
| | |
| | Check wiring between P2 - 6 (controller) to P1 - 4 (grill).
| | Note: Wire color changes from BLUE between P2 - 6 & Relay Box,
| | to ORANGE between Relay Box & P1 - 4.
| | DID THIS FIND THE PROBLEM?
| | No. Yes, done.
| | |
| | See Special Problems.
| |
| DID TEST SHOW NO POWER TO CONTROLLER?
| No. Yes.
| | See No Controller Power.
| |
| Check J2 - 6 (controller) for damage.
| DID THIS FIND THE PROBLEM?
| No. Yes, done.
| |
| Replace the controller.
|
See Pump Will Not Run.

Moldboard Problems 9
PLOW WILL NOT ANGLE LEFT
Perform angle left.
DID PUMP MOTOR RUN?
No. Yes.
| Perform Controller Test Procedure.
| DID CONTROLLER TEST OK?
| No. Yes.
| | Perform Under Hood Harness Test Procedure.
| | DID UNDER HOOD HARNESS TEST OK?
| | No. Yes.
| | | Perform Plow Harness Test Procedure.
| | | DID PLOW HARNESS TEST OK?
| | | No. Yes.
| | | | Locate left hydraulic solenoid (See Power Unit Drawing).
| | | | Perform Hydraulic Solenoid Test Procedure.
| | | | DID LEFT SOLENOID TEST OK?
| | | | No. Yes.
| | | | | Hydraulic problem (See Hydraulic Unit Service Manual).
| | | | |
| | | | Replace left solenoid (See Hydraulic Unit Service Manual).
| | | |
| | | Check GREEN wire from J1 - 5 (plow harness) to left solenoid.
| | | DID THIS FIND THE PROBLEM?
| | | No. Yes, done.
| | | |
| | | See Special Problems.
| | |
| | Check wiring between P2 - 5 (controller) to P1 - 5 (grill).
| | Note: Wire color is GREEN between P2 - 5 & Relay Box
| | and GREEN between Relay Box & P1 - 5.
| | DID THIS FIND THE PROBLEM?
| | No. Yes, done.
| | |
| | See Special Problems.
| |
| DID TEST SHOW NO POWER TO CONTROLLER?
| No. Yes.
| | See No Controller Power.
| |
| Check J2 - 5 (controller) for damage.
| DID THIS FIND THE PROBLEM?
| No. Yes, done.
| |
| Replace the controller.
|
See Pump Will Not Run.

10 Moldboard Problems
PLOW WILL NOT RAISE
Perform up.
DID PUMP MOTOR RUN?
No. Yes.
| Locate down hydraulic solenoid (See Power Unit Drawing).
| Check if constantly on (See Hydraulic Solenoid Tests).
| IS DOWN SOLENOID CONSTANTLY ON?
| No. Yes.
| | Perform the Controller Test Procedure.
| | DID CONTROLLER TEST OK?
| | No. Yes.
| | | Perform Under Hood Harness Test Procedure.
| | | DID UNDER HOOD HARNESS TEST OK?
| | | No. Yes.
| | | | Perform Plow Harness Test Procedure.
| | | | DID PLOW HARNESS TEST OK?
| | | | No. Yes.
| | | | | Problem may be intermittent.
| | | | | See Special Problems.
| | | | |
| | | | Check BROWN wire between J1 - 3 & down solenoid
| | | | for short to +12.
| | | | DID THIS FIND THE PROBLEM?
| | | | No. Yes, done.
| | | | |
| | | | See Special Problems.
| | | |
| | | Check RED wire between P2 - 2 & Relay Box for short to +12.
| | | Check BROWN wire between Relay Box & P1 - 3 for short to +12.
| | | DID THIS FIND THE PROBLEM?
| | | No. Yes, done.
| | | |
| | | See Special Problems.
| | |
| | Replace the controller.
| |
| Hydraulic problem (See Hydraulic Unit Service Manual).
|
See Pump Will Not Run.

Moldboard Problems 11
PLOW WILL NOT LOWER
Perform the Controller Test Procedure
DID CONTROLLER TEST OK?
No. Yes.
| Perform Under Hood Harness Test Procedure.
| DID UNDER HOOD HARNESS TEST OK?
| No. Yes.
| | Perform Plow Harness Test Procedure.
| | DID PLOW HARNESS TEST OK?
| | No. Yes.
| | | Locate down hydraulic solenoid (See Power Unit Drawing).
| | | Perform Hydraulic Solenoid Test Procedure.
| | | DID DOWN SOLENOID TEST OK?
| | | No. Yes.
| | | | Hydraulic problem (See Hydraulic Unit Service Manual).
| | | |
| | | Replace down solenoid (See Hydraulic Unit Service Manual).
| | | DID THIS FIND THE PROBLEM?
| | | No. Yes, done.
| | | |
| | | See Special Problems.
| | |
| | Check BROWN wire from J1 - 3 (plow harness) to down solenoid.
| | DID THIS FIND THE PROBLEM?
| | No. Yes, done.
| | |
| | See Special Problems.
| |
| Check wiring between P2 - 2 (controller) to P1 - 3 (grill).
| Note: Wire color changes from RED between P2 - 2 & Relay Box,
| to BROWN between Relay Box & P1 - 3.
| DID THIS FIND THE PROBLEM?
| No. Yes, done.
| |
| See Special Problems.
|
DID TEST SHOW NO POWER TO CONTROLLER?
No. Yes.
| See No Controller Power.
|
Check J2 - 2 (controller) for damage.
DID THIS FIND THE PROBLEM?
No. Yes, done.
|
Replace the controller.

12 Moldboard Problems
PLOW CONSTANTLY ANGLES LEFT
Locate left hydraulic solenoid (See Power Unit Drawing).
Check if constantly on (See Hydraulic Solenoid Test Procedure).
IS LEFT SOLENOID CONSTANTLY ON?
No. Yes.
| Perform Controller Test Procedure.
| DID CONTROLLER TEST OK?
| No. Yes.
| | Perform Under Hood Harness Test Procedure.
| | DID UNDER HOOD HARNESS TEST OK?
| | No. Yes.
| | | Perform the Plow Harness Test Procedure.
| | | DID PLOW HARNESS TEST OK?
| | | No. Yes.
| | | | See Special Problems.
| | | |
| | | Check GREEN wire from J1 - 5 (plow harness) to left solenoid for short to +12.
| | | DID THIS FIND THE PROBLEM?
| | | No. Yes, done.
| | | |
| | | See Special Problems.
| | |
| | Check wiring between P2 - 5 (controller) to P1 - 5 (grill) for short to +12.
| | Note: Wire color is GREEN between P2 - 5 & Relay Box
| | and GREEN between Relay Box & P1 - 5.
| | DID THIS FIND THE PROBLEM?
| | No. Yes, done.
| | |
| | See Special Problems.
| |
| Replace the controller.
|
Hydraulic problem (See Hydraulic Unit Service Manual).

Moldboard Problems 13
PLOW CONSTANTLY ANGLES RIGHT
Locate right hydraulic solenoid (See Power Unit Drawing).
Check if constantly on (See Hydraulic Solenoid Test Procedure).
IS RIGHT SOLENOID CONSTANTLY ON?
No. Yes.
| Perform Controller Test Procedure.
| DID CONTROLLER TEST OK?
| No. Yes.
| | Perform Under Hood Harness Test Procedure.
| | DID UNDER HOOD HARNESS TEST OK?
| | No. Yes.
| | | Perform Plow Harness Test Procedure.
| | | DID PLOW HARNESS TEST OK?
| | | No. Yes.
| | | | See Special Problems.
| | | |
| | | Check ORANGE wire between J1 - 4 (plow harness ) & right solenoid
| | | for short to +12.
| | | DID THIS FIND THE PROBLEM?
| | | No. Yes, done.
| | | |
| | | See Special Problems.
| | |
| | Check wiring between P2 - 6 (controller) to P1 - 4 (grill) for short to +12.
| | Note: Wire color changes from BLUE between P2 - 6 & Relay Box,
| | to ORANGE between Relay Box & P1 - 4.
| | DID THIS SOLVE THE PROBLEM?
| | No. Yes, done.
| | |
| | See Special Problems.
| |
| Replace the controller.
|
Hydraulic problem (See Hydraulic Unit Service Manual).

PLOW OPERATES SLOWLY
The plow should take approximately two seconds to perform moldboard movements.
DOES IT DO THIS?
No. Yes, done.
|
IS THE PLOW BEING USED AT EXTREMELY COLD TEMPERATURES?
No. Yes.
| See chart for recommended oils at various temperatures.
| DID THIS FIND THE PROBLEM?
| No. Yes, done.
| |
|______|
|
See No Plow Power.
HYDRAULIC OIL SELECTION CHART
14 Moldboard Problems
The following chart shows various hydraulic oils
and their recommended temperature range. Se-
lect an oil that is appropriate for your location
and plowing conditions. Old or contaminated hy-
draulicoilcancausemanyoperationalproblems.
Hydraulic oil should be changed every year for
best performance.
Refer to the Operators Manual for specic in-
structions on changing oil.
CAUTION: Do not mix different types
of hydraulic uid. Some uids are not
compatible and may cause perfor-
mance problems and product damage.
DWG NO. 3991A
RECOMMENDED OILS AT VARIOUS TEMPERATURES
OIL TEMPERATURE - - DEGREES FAHRENHEIT
-60 -40 -20 0 20 40 60 80 100
-100 -50 0 50 100 150 200
UNIVIS J26
MIL-5606
SAE 5
ISO VG 22
SAE 10
ATF
OIL TEMPERATURE - - DEGREES CENTIGRADE
MAX. RECOMMENDED PUMP
OPERATING TEMPERATURE.
HYDRAULIC OIL SELECTION CHART