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DIAGNOSTIC METHOD - FIND THE PROBLEM....FAST!
Testing Plow Functions: Disconnect the Packard Connector for the function to be tested. The Table below indicates
the Color Code for each function. Connect the alligator clip of the test light to a ground source (the stud on the back of
the Pump Assembly). Insert the test probe into the colored side of the Packard Connector (the Orange Wire side is used
for a ground connection) and activate the function. Remember, Lift, Left Angle & Right Angle functions also activate
the Pump Motor (Brown Wire) simultaneously. If the Packard Controller is receiving power when the function is
activated, the Plow Side Harness is working properly.
Testing Plow Light System: For Headlight testing on the Plow, disconnect the Plow Light pigtail from the Harness and,
using the Table below, test for Light functions, i.e. Hi-Beam, Lo-Beam, Common, Parking Lights and Directional Lights.
If the functions are receiving voltage, the Plow Harness is working properly and there may be a malfunction within the
Plow Headlight Assembly. If the functions are not receiving voltage, there may be an internal malfunction in the Plow
Side Harness.
Testing 12vdc Valve Coils: Leave the Battery side of the Pump Motor Solenoid disconnected from the Battery.
Remove the 12vdc Coil from the Valve for the function to be tested. Insert the probe of the test light through the hole in
the Coil. Activate the function using the In-Cab Control. A magnetic draw from the Coil should pull the test probe when
energized. If no draw is present, the Coil may be faulty.
If the 12vdc Valve Coils are working properly, the function problem is most likely a Hydraulic problem.
After it has been determined that both the Vehicle Side and Plow Side Harnesses are in proper working order, the next
step will be to troubleshoot the Hydraulic System, with particular attention to the Manifold.
The main function of the Hydraulic Manifold is to direct fluid to the appropriate Cylinder to perform a task.
For Example: When the In-Cab Control is moved to the 'Plow Lift' function, the Pump Motor spins the Pump developing
pressure. This pressure enters the Manifold. The Manifold’s internal plumbing is configured in such a way that if no
Valve is opened, the fluid will return to the Reservoir on the Electric/Hydraulic Power Unit. Activating the 'Plow Lift'
function not only engages the Pump, but also shifts the 'Plow Lift/Jack Extend' Valve to the 'Plow Lift' position. The
pressurized fluid will follow the path of least resistance, in this case, the opened ‘Plow Lift’ passageway. The fluid then
exits the Manifold through the 'Lift' Hose attached to the 'H' Port on the Manifold and the 7-1/2" Lift Cylinder at the other
end. Pressurized fluid extends the Lift Cylinder raising the Plow. Read through the following pages for detailed
Hydraulic and Electrical Circuit information.
Related Components: Electric/Hydraulic Power Unit
Hydraulic Manifold
System #3: Snowplow Hydraulic System:
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