Unimount plows are remarkably simple to service, offering easy access to components; begin by verifying controller power and fuse integrity for initial diagnostics.
Western plow systems are renowned for their durability and performance in demanding snow removal applications. Understanding the fundamental operation of these systems is crucial for effective troubleshooting. These plows typically utilize a combination of hydraulic and electrical components to control blade lift, angle, and other functions. The controller unit serves as the central hub, receiving signals from the operator and translating them into commands for the hydraulic pump and solenoid valves.
A key aspect of Western plow design is the unimount system, which simplifies installation and removal. Before diving into specific issues, always confirm a solid power supply to the controller, checking the red wire connection to a 12V source and the inline fuse. Proper grounding is also essential for reliable operation, so inspect the orange/black wire at the battery and all ground connections thoroughly.
Understanding Western Plow Components
Western plows consist of several key components working in unison. The hydraulic pump, driven by the vehicle’s electrical system, provides the force to raise and angle the blade. Solenoid valves direct hydraulic fluid to the lift and angle cylinders, controlling blade movement. The controller unit interprets operator input from the in-cab controls, sending signals to the solenoids.
Crucially, the wiring harness connects all these elements, and its integrity is paramount. Pay close attention to the large plug at the front of the truck, as pins can corrode and cause intermittent contact. The unimount system itself, while simple, relies on secure pin connections. Finally, the plow motor and associated solenoid are vital for overall functionality, and direct voltage testing can quickly isolate issues within these components.
Electrical System Troubleshooting
Begin with checking the controller’s red wire for 12V power and a functional inline fuse, then inspect the orange/black wire at the battery.
Controller Unit Diagnostics
Initial assessment involves confirming the controller light illuminates; a lack of illumination suggests a power supply issue. Carefully inspect the red wire emanating from the controller harness, ensuring a secure connection to a 12-volt power source. Critically, verify the inline fuse associated with this circuit hasn’t blown, interrupting power flow.
Further investigation requires checking the orange/black wire connection at the battery terminal, guaranteeing a solid electrical pathway. If the controller light is illuminated, proceed to consult pages 43 and 44 of the Auton-provided documentation. These pages detail specific diagnostic procedures designed to isolate or confirm a malfunctioning controller unit.
Remember, a functioning controller is paramount for proper plow operation; systematic testing, starting with basic power checks, is essential for accurate diagnosis and efficient repair.
Fuse and Wiring Checks
Begin with a visual inspection of all fuses related to the plow system, located both in the truck’s fuse box and within the controller unit itself. Look for any signs of blown fuses – a broken filament is a clear indicator. Replace any faulty fuses with the correct amperage rating to avoid further damage.
Next, meticulously trace the wiring harness, paying close attention to connections and potential pinch points. Examine the red wire supplying power to the controller, and the orange/black wire connected to the battery. Ensure these connections are clean, tight, and free from corrosion.
Utilize a multimeter to verify voltage continuity along the wiring paths. A break in the wire, or a corroded connection, will disrupt the electrical flow. Address any wiring issues promptly to restore proper functionality.
Battery Connection Verification
A robust battery connection is fundamental for reliable plow operation. Begin by inspecting the battery terminals for corrosion; clean them thoroughly with a wire brush if necessary. Ensure the battery cables are securely fastened to the terminals, providing a tight and consistent connection.
Verify the orange/black wire, connecting the plow controller to the battery, is firmly attached and free from damage. Use a multimeter to check for proper voltage at this connection, confirming the controller receives adequate power. A weak or intermittent connection can cause operational issues.
Consider the battery’s overall health; a weak battery may struggle to provide sufficient amperage for the plow motor, especially in cold weather. Test the battery’s voltage under load to assess its capacity.
Ground Connection Testing
Proper grounding is crucial for the Western plow’s electrical system to function correctly. Begin by locating the ground wire eyelet connected to the plow motor’s ground lug. Using a multimeter set to volts, connect the red lead to the positive battery terminal and the black lead to the ground wire eyelet.
You should obtain a reading equivalent to the battery’s voltage. While testing, have an assistant gently wiggle the plow-truck plug containing the wiring harness. Observe the multimeter; any fluctuation in the voltage reading indicates a poor ground connection within the plug.
Address any voltage drops by cleaning the connector pins or replacing the plug if necessary; A faulty ground can cause intermittent operation or complete failure of the plow system.
Hydraulic System Troubleshooting
Inspect fluid levels, check hoses for leaks, and verify solenoid valve operation alongside pump motor functionality for optimal hydraulic performance and responsiveness.
Hydraulic Fluid Level Inspection
Begin by locating the hydraulic reservoir, typically a translucent tank allowing visual fluid level assessment. Ensure the plow is in a lowered position during this check for accurate readings. Observe the fluid level against the marked indicators – ‘Full’ and ‘Low’ – on the reservoir.
Low fluid levels can indicate a leak within the system, potentially stemming from hoses, cylinders, or the pump itself. If the level is consistently low despite topping off, a thorough leak inspection is crucial. Conversely, overfilling can lead to aeration and reduced efficiency.
Check the fluid’s condition; it should be clean and free of debris. Dark or cloudy fluid suggests contamination, necessitating a fluid change. Always use the manufacturer-recommended hydraulic fluid type to avoid damaging seals and components. Regular fluid level checks are vital for maintaining optimal plow operation and preventing costly repairs.
Hydraulic Hose Leak Detection
Start a visual inspection of all hydraulic hoses, meticulously examining them for any signs of damage – cracks, abrasions, bulges, or kinks. Pay close attention to hose connections at both ends, where leaks commonly originate. Feel along the hoses for dampness or residue, indicating a potential leak even if not immediately visible.
Operate the plow through its full range of motion – lift, lower, angle – while carefully observing the hoses. This will help pinpoint leaks that only appear under pressure. A slow, deliberate movement is best for accurate observation.
If a leak is detected, immediately shut down the system. Tighten connections if possible, but if the hose is damaged, replacement is necessary. Never attempt to repair a damaged hose; always use a new, manufacturer-approved replacement to ensure compatibility and prevent further issues. Prompt leak repair prevents fluid loss and maintains hydraulic system efficiency.
Solenoid Valve Operation Check
Begin by verifying power reaches the solenoid valve. Use a multimeter to confirm 12V DC is present when the corresponding plow control is activated. A lack of voltage indicates an electrical issue upstream – check fuses, wiring, and the controller.
If power is present, carefully listen for a distinct “click” sound from the solenoid when activated. This confirms the solenoid is receiving a signal and attempting to operate. Absence of a click suggests a faulty solenoid requiring replacement.
Directly applying 12V to the solenoid’s red wire (with the system off) can bypass the controller for testing. If the solenoid clicks and the plow functions, the controller is likely the problem. Ensure proper polarity when applying direct voltage. A functioning solenoid is crucial for hydraulic fluid flow and plow operation.
Pump Motor Functionality
Initial assessment involves verifying the pump motor receives power when the plow system is activated. Utilize a multimeter to confirm 12V DC is reaching the motor’s terminals; a lack of voltage points to upstream electrical faults like blown fuses or wiring issues.
Listen carefully for the pump motor to engage and run smoothly when activated. Unusual noises – grinding, whining, or complete silence – indicate potential problems. A failing pump motor will struggle to build hydraulic pressure, impacting plow lift and angling.
Inspect the pump motor for physical damage, such as cracked housings or loose connections. If the motor runs but the plow doesn’t respond, suspect internal pump failure or a blockage in the hydraulic lines. Proper pump function is vital for overall plow operation.
Plow Lift and Angle Unit Troubleshooting
Carefully examine lift and angle cylinders for leaks, damage, and proper pin connections; ensure smooth operation and responsive movement for optimal performance.
Lift Cylinder Inspection
Begin a thorough inspection of the lift cylinder for any visible signs of hydraulic fluid leakage around the seals, rod, and cylinder body itself. Carefully check the cylinder rod for pitting, corrosion, or damage, as these imperfections can compromise the seal and lead to fluid loss and reduced lifting capacity.
Extend and retract the lift cylinder fully, observing its movement for smoothness and any binding or hesitation. Any jerky or uneven motion indicates a potential internal issue within the cylinder. Inspect the cylinder’s mounting points and connections to the plow frame and lift linkage for looseness or damage.
Ensure all pins are securely in place and properly lubricated. A loose or worn pin can cause instability and affect the plow’s lifting performance. Finally, verify that the cylinder is operating at the correct pressure and speed, comparing it to the manufacturer’s specifications if available. Addressing these points will ensure reliable plow lifting.
Angle Cylinder Inspection
Start by visually examining the angle cylinder for any external leaks around the hydraulic fittings, seals, and cylinder walls. Look closely for signs of corrosion or damage to the cylinder rod, which can compromise its ability to seal properly and maintain hydraulic pressure.
Operate the angling function several times, carefully observing the cylinder’s movement. Note any sluggishness, binding, or uneven angling action. Smooth and consistent movement is crucial for effective snow displacement. Inspect the mounting brackets and pivot points of the angle cylinder, ensuring they are secure and free from excessive wear.
Confirm that all connecting pins are properly seated and lubricated to prevent binding and ensure optimal angling performance. Check for any loose connections or damaged hoses associated with the angle cylinder’s hydraulic lines. A properly functioning angle cylinder is vital for precise snow control.
Pin and Connection Point Examination
Begin a thorough inspection of all pins securing the plow to the vehicle and its various components. Verify each pin is fully seated and secured with the appropriate retaining devices – cotter pins or clips – to prevent accidental dislodgement during operation. Look for signs of wear, elongation, or shearing on the pins themselves, indicating potential failure.
Next, examine the connection points – the areas where the plow frame interfaces with the mounting brackets and hydraulic cylinders. Check for cracks, bends, or corrosion that could weaken the structure. Ensure all bolts are tightened to the manufacturer’s specified torque.
Pay close attention to the electrical connectors, wiggling them gently to check for loose connections or damaged wiring. Secure connections are essential for reliable plow operation. A compromised pin or connection point can lead to instability and potential safety hazards.
Common Western Plow Issues
Intermittent operation, unresponsive controls, a failing plow motor, and a controller light that won’t illuminate are frequent problems encountered by users.
Intermittent Operation Problems
Intermittent plow function often points to connection issues, specifically within the truck-to-plow wiring harness. A common fix involves having an assistant gently wiggle the large plug containing multiple wires while you attempt to operate the up, left, and right functions. This “wiggle test” can reveal corroded or loose pins causing inconsistent contact.
Voltage drops across ground connections are also frequent culprits; use a multimeter to verify a consistent voltage reading between the battery’s positive terminal and the ground lug on the plow motor, while simultaneously wiggling the aforementioned plug. Fluctuating readings indicate a poor ground connection needing attention. Remember to check the orange/black wire connection at the battery as well, ensuring a secure and clean connection for reliable power delivery to the controller.
No Response from Plow Controls
Complete lack of response from the plow controls typically begins with verifying power to the controller unit. First, confirm the controller light is illuminated; if not, inspect the red wire extending from the controller harness, ensuring it’s securely connected to a 12-volt power source and that the inline fuse isn’t blown. Simultaneously, check the orange/black wire connection at the battery for proper attachment.
If the controller light is illuminated, consult pages 43 and 44 of the Auton documentation (if available) for specific controller diagnostics. These pages will guide you through steps to rule out a faulty controller. Should the controller receive power, directly jump the solenoid or apply 12V to the red wire leading to the plow motor to test its functionality independently.
Plow Motor Not Engaging
If the plow motor fails to engage despite controller power, a direct test is crucial. Bypass the controller by jumping the solenoid or applying 12V directly to the red wire connected to the plow motor. If the motor runs during this direct test, the issue likely resides within the controller or its wiring, not the motor or solenoid itself. This isolates the problem effectively.
However, if the motor remains unresponsive even with direct power, further investigation of the motor and solenoid is necessary. Check for internal motor damage or a faulty solenoid. Simultaneously, have an assistant gently wiggle the large connector plug at the front of the truck while attempting to operate the plow; intermittent contact within this plug is a common culprit.
Controller Light Not Illuminating
A non-illuminating controller light typically indicates a power supply issue. Begin by inspecting the red wire emanating from the controller harness, ensuring a secure connection to a 12-volt power source. Critically, verify the inline fuse associated with this red wire hasn’t blown – a frequent cause of this symptom. Simultaneously, confirm the orange/black wire is firmly connected at the battery terminal, providing the necessary ground path.
If these connections are sound, proceed to consult pages 43 and 44 of the documentation (as referenced by Auton) for more detailed controller diagnostics. These pages offer specific troubleshooting steps to pinpoint a potentially faulty controller unit. Addressing power supply issues is the first step towards resolving plow functionality.
Advanced Troubleshooting Techniques
Employ a multimeter for precise voltage testing, consider jump-starting the solenoid, and utilize “wiggle testing” on connectors to identify intermittent connection problems.
Multimeter Usage for Voltage Testing
Precise voltage readings are crucial for diagnosing Western plow issues. Begin by setting your multimeter to the DC voltage setting, typically 20V or higher. Connect the red lead to the positive terminal of the battery and the black lead to a known good ground. You should observe a reading close to 12.6 volts.
Next, test the ground connection at the plow motor; connect the red lead to the battery’s positive terminal and the black lead to the ground wire eyelet on the plow motor. A reading matching the battery voltage confirms a solid ground. While someone wiggles the plow-truck connector, monitor for voltage fluctuations, indicating a potential connection issue.
Further testing involves checking voltage at the controller unit, verifying it receives power from the battery via the orange/black wire. Consistent voltage readings throughout the system pinpoint problematic areas efficiently, aiding in accurate repairs.
Jump Starting the Solenoid
Directly powering the solenoid is a key diagnostic step. Locate the solenoid on the plow motor, typically a small cylindrical component with wires attached. Using a jumper wire or a fused test lead, carefully apply 12V DC power directly to the red wire leading to the solenoid.
Ensure the connection is secure and observe if the plow motor engages. If the motor activates, this confirms the solenoid and motor are functional, isolating the issue to the controller or wiring. If no response, the solenoid or motor itself may be faulty, requiring further investigation or replacement.
Caution: Always disconnect the power source before making any further adjustments or repairs. This method bypasses the controller, helping to pinpoint the source of the problem quickly and safely.
Wiggle Testing Connectors
Intermittent connections are a frequent cause of plow malfunctions. With the plow controls activated (Up, Down, Left, Right), have an assistant gently wiggle the main plow-to-truck connector and the controller harness. Pay close attention to any changes in plow operation during this process.
If wiggling a connector restores function, even momentarily, it indicates a loose or corroded connection. Disconnect the connector, inspect the pins for damage or corrosion, and clean them with electrical contact cleaner. Ensure a secure connection is re-established.
Focus on the large plug with numerous wires, as these pins are prone to wear. This simple test can quickly identify problematic connections without requiring extensive disassembly.