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SnowEx RD Mechanic's Manual

Straight blade snowplows
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September 1, 2020
Lit. No. 72188, Rev. 01
SNOWPLOWS
MECHANIC'S GUIDE
RD, HD & LT STRAIGHT BLADE
SNOWPLOWS
CAUTION
Read this manual before servicing the snowplow.

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  • Page 1 September 1, 2020 Lit. No. 72188, Rev. 01 SNOWPLOWS MECHANIC'S GUIDE RD, HD & LT STRAIGHT BLADE SNOWPLOWS CAUTION Read this manual before servicing the snowplow.
  • Page 2 Attach Snowplow ..................41 Aiming Headlamp Beams ................8 Detach Snowplow ..................43 Raise ......................45 HYDRAULIC SYSTEM ..................9 Lower ......................47 SnowEx Straight Blades Hydraulic System Specifications ......9 ® FLOAT ....................... 49 Hydraulic Unit Components Diagram ............11 Angle Right ....................51 Valve Locations ..................12 Angle Left ....................
  • Page 3 • Seal Repair Tool, PN 52252 • Hex key set, including 3/8" Service of your SnowEx snowplow equipment is • 3-Port Isolation Module and Cab Control • Combination standard wrench set best performed by your local SnowEx products Tester: PN 41000-1 outlet.
  • Page 4 SAFETY SAFETY DEFINITIONS WARNING/CAUTION AND INSTRUCTION LABELS WARNING Become familiar with and inform users about Warning/Caution Label Indicates a potentially hazardous situation the warning and instruction labels on the back of that, if not avoided, could result in death or the blade.
  • Page 5 Read and understand labels and the whenever the snowplow is not in use. The FUSES Owner's Manual before installing, operating, or power indicator light will turn OFF. making adjustments. The SnowEx electrical and hydraulic systems ® contain several automotive-style fuses. If a problem WARNING WARNING...
  • Page 6 SAFETY NOISE Be careful when using gasoline. Do not use gasoline to clean parts. Store only in approved WARNING CAUTION CAUTION Gasoline is highly flammable and gasoline Batteries normally produce explosive Read instructions before assembling. vapor is explosive. Never smoke while gases, which can cause personal injury.
  • Page 7 BLADE, A‑FRAME & HEADGEAR INSTALLING THE EMERGENCY TRANSPORT CHAIN 6. Secure the A-frame to the stacking stop cross Install the two cotter pins into the clevis pins, The Chain Kit (PN 84787) is used to temporarily bar using the chain with removable clevis securing the pins in the clevis link.
  • Page 8 BLADE, A‑FRAME & HEADGEAR AIMING HEADLAMP BEAMS Tighten headlamp fasteners to 22 ft-lb or 30 N · d. Check the functioning of any automatic 2. Mark (or tape) the vertical centerline of with rubber gasket once correct visual aim is vehicle leveling systems and specific the snowplow headlamps and the vertical achieved.
  • Page 9 1800 +/– 50 psi pump relief valve • Maximum Motor Amperage Draw: 4000 psi crossover relief valve Hydraulic Fluid ◦ LT and RD Snowplows (3" motor) = 150–200A 425 psi scrape lock ◦ HD Snowplows (4" motor) = 200–250A CAUTION 0.000477 gal/rev pump...
  • Page 10 HYDRAULIC SYSTEM SPECIFICATIONS, continued Fastener Torque Specifications Pump Cap Screws 5/16-18 x 2-1/4 150–160 in-lb Motor Terminals (+ and –) 5/16-18 Nut 50–60 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 Cover Screws...
  • Page 11 Plug Relief Valves Solenoid Cartridge Valves Plow Control Module * 550 psi for LT and RD blades; 725 psi for HD blades. For optional Scrape Maxx™ accessory, 200 psi. † Blade drop speed adjustment. ‡ Lit. No. 72188, Rev. 01...
  • Page 12 HYDRAULIC SYSTEM VALVE LOCATIONS Solenoid Cartridge Valves Coil Valve Type Wire Color SV08-2211 PINK S2C1 (Top) DARK GREEN SV08-47D S2C2 (Bottom) PURPLE S3C1 (Top) YELLOW SV08-47C S3C2 (Bottom) BROWN S2C2 SV08-2211 BLUE S2C1 S3C2 S3C1 Lit. No. 72188, Rev. 01 September 1, 2020...
  • Page 13 HYDRAULIC SYSTEM CARTRIDGE VALVES The SnowEx straight blade snowplow ® Three of the blade movement functions require Power from the vehicle battery is supplied to the hydraulic system performs five blade movement energizing the electric motor and opening solenoid solenoid coils and the motor relay via the plow functions and two blade attachment functions.
  • Page 14 Relief Valve Settings Crossover Relief 4000 psi (bidirectional) Lift Ram Base End 425 psi (scrape lock) Manifold LT: 1800 psi Pump Relief RD: 1800 psi HD: 2000 psi RV3 Pump Relief RV2 Scrape Lock Lit. No. 72188, Rev. 01 September 1, 2020...
  • Page 15 1/8 to 1/4 turn to lock the fitting Angle Ram in place. Final torque on the jam nut should be approximately 20 ft-lb. Pressure Switch (550 psi LT and RD blades, 725 psi HD blade) HD Unit Shown Lit. No. 72188, Rev. 01 September 1, 2020...
  • Page 16 HYDRAULIC SYSTEM BLADE DROP SPEED ADJUSTMENT 3. Turn the quill IN (clockwise) to decrease WARNING the drop speed. Turn the quill OUT Keep 8' clear of the blade when it is being (counterclockwise) to increase the drop speed. raised, lowered, or angled. Do not stand between vehicle and blade or directly in front of the blade.
  • Page 17 Controls are also used to program the start to flash, refer to "Control/Cable/Plow Module SECURITY GUARD™ anti-theft system and Test" in the Troubleshooting section of activate the optional Scrape Maxx™ down SnowEx straight blade snowplows can be ® this guide. force feature (requires installation of the operated by a POWER GRIP™...
  • Page 18 CAB CONTROLS OPERATING THE POWER GRIP™ HAND‑HELD CONTROL Function Time‑Outs Control Functions WARNING The driver shall keep bystanders clear of the All control functions, except LOWER/FLOAT, time Raise, Lower, Float, Angle blade when it is being raised, lowered, or out (stop) automatically after a period of time. This Pressing the four diamond-shaped buttons in the angled.
  • Page 19 CAB CONTROLS OPERATING THE JOYSTICK CONTROL Function Time‑Outs The ON/OFF switch operates as an WARNING emergency stop, if required. The driver shall keep bystanders clear of the All control functions, except LOWER/FLOAT, time blade when it is being raised, lowered, or out (stop) automatically after a period of time.
  • Page 20 CAB CONTROLS OPERATING THE JOYSTICK CONTROL, continued Joystick Control Lever Movement Control Functions Function Description of Operation From the center position, the control lever can be Raise, Lower, Float, Angle Move the control lever straight to the left (Angle Left) to angle the blade left.
  • Page 21 FLEET FLEX ELECTRICAL SYSTEM SMOOTH STOP AND ONE‑TOUCH FLOAT FEATURES Smooth Stop Enable/Disable Procedure One‑Touch Float: Move and hold the control lever to the "LOWER" position, or press and Smooth stop, or soft stop, allows the blade to coast To enable/disable the One-Touch FLOAT and hold the "LOWER"...
  • Page 22 FLEET FLEX ELECTRICAL SYSTEM SECURITY GUARD™ SNOWPLOW ANTI‑THEFT SYSTEM Activation & Establishing a 4‑Digit Manual Unlock Enter your 4-digit security code by moving the control lever to (or pressing the button for) Security Code If the SECURITY GUARD system is activated any four of the eight following positions: UP, and you are using a FLEET FLEX control with a DOWN, LEFT, RIGHT, 1, 2, 3, or 4.
  • Page 23 FLEET FLEX ELECTRICAL SYSTEM SECURITY GUARD™ Snowplow Anti‑Theft System, continued Clearing an Established 4‑Digit Light Flash Indicators Additional Notes Security Code • The SECURITY GUARD system requires any POWER – Red Function control (other than the one with the assigned 1.
  • Page 24 FLEET FLEX ELECTRICAL SYSTEM SECURITY GUARD™ Snowplow Anti‑Theft System, continued Hand‑Held Master Control 1. Turn the vehicle ignition to the "OFF" position. 3. While pushing down on the plate, turn the ignition ON. 2. With the control power OFF, using the tool that Universal Clear Security was included in the Distributor Master Control 4.
  • Page 25 VEHICLE‑SIDE ELECTRICAL COMPONENTS HARNESS DIAGRAM – 3‑PORT ISOLATION MODULE CAUTION On 2‑plug electrical systems, plug covers shall be used whenever snowplow is Factory Vehicle Harness disconnected. Before 2019 vehicle Park/Turn 8" Cable battery cable is 12V unfused source. Lamps Battery 200A Fuse &...
  • Page 26 VEHICLE‑SIDE ELECTRICAL COMPONENTS 3‑PORT ISOLATION MODULE OVERVIEW The isolation module acts as an electrical hub, With the snowplow attached, the isolation module NOTE: References to "left" and "right" are automatically directing vehicle power to the is still inactive until either the vehicle parking lamps correct for modules located on the driver's appropriate vehicle or snowplow lighting devices, are turned ON or the vehicle ignition switch is...
  • Page 27 VEHICLE‑SIDE ELECTRICAL COMPONENTS 3‑Port Isolation Module Function, continued Snowplow Not Attached to Vehicle • Activating the vehicle park lamp circuit applies • On vehicles equipped with DRLs integrated voltage to the module park circuit input. A into the vehicle headlamps: Activation of System is inactive.
  • Page 28 The Scrape Maxx accessory kit is compatible with removed. WARNING LT, RD, and HD straight blade snowplows. It does not affect the operation of One-Touch FLOAT. Keep 8' clear of the blade when it is being Breather -4 O-Ring raised, lowered, or angled.
  • Page 29 Scrape Maxx™ DOWN FORCE ACCESSORY KIT (PN 84854) Scrape Maxx Kit Installation, continued OPERATING INSTRUCTIONS 6. Reinstall the reservoir breather. 9. Turn the cab control ON. Raise and lower the blade several times to purge the lift ram. Locate the black connector with two gray wires Do not enable the Scrape Maxx mode until the on the harness connected to the B port of the 10.
  • Page 30 ELECTRICAL & HYDRAULIC SCHEMATICS OVERVIEW ELECTRICAL LEGEND HYDRAULIC LEGEND The hydraulic and electrical schematics in this section explain how the hydraulic unit performs CROSSING WIRE LINE, WORKING (MAIN) SPRING the different functions. A schematic is an abstract SOLENOID, drawing showing the purpose of each of the LINES JOINING SINGLE WINDING components in the system.
  • Page 31 HEADLAMPS – ELECTRICAL/HARNESSES FLOAT Ground FLOAT Input FLOAT EdgeView™SENSE IN EdgeView LIGHT COMMON COMMON BLK/ORN BLK/ORN RIGHT LOW RIGHT LOW BLK/WHT BLK/WHT RIGHT HIGH RIGHT HIGH WHT/YEL WHT/YEL LEFT HIGH LEFT HIGH BEL OUT EdgeView LIGHT COMMON BLK/ORN BLK/ORN LEFT LOW LEFT LOW LEFT TURN LEFT TURN...
  • Page 32 TYPICAL LED PLOW LIGHT, HEADLAMP CONTROL MODULE (HCM), AND HARNESS DIAGRAM 25A Fuse NOTE: On 2‑plug electrical systems, plug Vehicle Vehicle covers shall be used whenever snowplow is Grounding Post Battery Cable disconnected. Assembly 200A Fuse Vehicle Battery Cable and Holder Vehicle Control Harness To Switched Accessory...
  • Page 33 HEADLAMPS: TYPICAL LED SCHEMATIC (continued on following page) BAT (+) 8 RED TO VEHICLE 8 BLK BATTERY BAT ( ) CABLE ASSEMBLY, HCM PN 72549 (72550) CONNECTION: FROM WIRE ON THE FLOAT SOLENOID COIL, HYDRAULIC UNIT, TO YELLOW WIRE BREAKOUT AT THE Y OF THE PLOW LIGHTING HARNESS.
  • Page 34 HEADLAMPS: TYPICAL LED SCHEMATIC (continued from previous page) 18 BLK TO PLOW CONTROL 18 RED FROM VEHICLE BAT (+) 14 RED/GRN BAT ( ) 12 BLK CABLE ASSEMBLY TO SWITCHED PLOW CONTROL HARNESS ACCESSORY LEAD ISOLATION MODULE TYPICAL PLUG-IN HARNESS (BLUE WIRES) LO_IN LOW IN...
  • Page 35 HEADLAMPS: TYPICAL DUAL‑WIRE HALOGEN/LED SCHEMATIC (continued on following page) TO VEHICLE BAT (+) 8 RED BATTERY BAT ( ) 8 BLK CONNECTION: FROM WIRE ON THE FLOAT SOLENOID COIL, CABLE ASSEMBLY, HCM HYDRAULIC UNIT, TO YELLOW WIRE BREAKOUT AT THE Y PN 72549 (72550) OF THE PLOW LIGHTING HARNESS.
  • Page 36 HEADLAMPS: TYPICAL DUAL‑WIRE HALOGEN/LED SCHEMATIC (continued from previous page) 18 BLK TO PLOW CONTROL 18 RED BAT (+) FROM VEHICLE 14 RED/GRN BAT ( ) 12 BLK TO SWITCHED CABLE ASSEMBLY ACCESSORY LEAD PLOW CONTROL HARNESS ISOLATION MODULE (BLUE WIRES) TYPICAL PLUG-IN HARNESS LO_IN LOW IN...
  • Page 37 HEADLAMPS: DUAL‑WIRE HALOGEN/LED INSTALLATION PART OF FACTORY VEHICLE HARNESS BATTERY VEHICLE INSTALL: LIGHTS VEHICLE CABLE ASSEMBLY PN: 72549 (72550) NO CHANGE: VEHICLE BATTERY CABLE PN: 28584 (42014) HALOGEN PLOW LIGHTS NO CHANGE: NO CHANGE: TO PLOW CONTROL TYPICAL 3-PORT PLOW LIGHTING HARNESS CONNECT TO A NO CHANGE: PLUG-IN...
  • Page 38 LED HEADLAMPS EdgeView™ BLADE‑EDGE ILLUMINATION SYSTEM – LED LIGHTING APPLICATIONS Changing the Blade‑Edge EdgeView Lighting Connections Remove the jumper fuse from the fuse holder and re-insert it in the desired mode position as shown Illumination Mode The EdgeView Float (FLT) mode activation function below.
  • Page 39 ELECTRICAL SYSTEM SCHEMATIC – STRAIGHT BLADE SNOWPLOWS Pump Motor DO/RO DO/RI 70448 Plow Control Harness Motor Relay 5A FUSES S2C2 S2C1 PP SENSE POWER Switch S2C2 S2C1 on Headgear DK GRN M/R (MOTOR) LIFT/LOWER (MOM-ON) ATTACH DETACH (ON) SCRAPE MAXX PRESSURE (MOM-ON) SWITCH*...
  • Page 40 PSW2 200 psi Scrape Lock QUILL S3C2 S3C1 S2C2 S2C1 TEST PUMP Pump Return to Reservoir *Detach Pressure Switch: 550 psi switch installed on LT and RD plows; 725 psi switch on HD plow. Lit. No. 72188, Rev. 01 September 1, 2020...
  • Page 41 ATTACH SNOWPLOW – ELECTRIC System Response Pump CAUTION Motor On units with the Scrape Maxx™ down force accessory installed and enabled, DO/RO the hydraulic pump will cycle ON and OFF DO/RI 70448 automatically when the vehicle ignition is Plow Control ON and the blade is in LOWER/FLOAT mode.
  • Page 42 Motor SV08-2211 S2C1 SV08-47D S2C2 S3C1 Pump SV08-47C S3C2 Return to SV08-2211 Reservoir * Detach Pressure Switch: 550 psi switch installed on LT and RD plows; 725 psi switch on HD plow. Lit. No. 72188, Rev. 01 September 1, 2020...
  • Page 43 DETACH SNOWPLOW – ELECTRIC System Response Pump CAUTION Motor On units with the Scrape Maxx™ down force accessory installed and enabled, DO/RO the hydraulic pump will cycle ON and OFF DO/RI 70448 automatically when the vehicle ignition is Plow Control ON and the blade is in LOWER/FLOAT mode.
  • Page 44 Motor SV08-2211 S2C1 SV08-47D S2C2 Pump S3C1 SV08-47C Return to S3C2 Reservoir SV08-2211 * Detach Pressure Switch: 550 psi switch installed on LT and RD plows; 725 psi switch on HD plow. Lit. No. 72188, Rev. 01 September 1, 2020...
  • Page 45 RAISE — ELECTRICAL System Response CAUTION Pump Motor Battery voltage is supplied to the plow module, motor relay, and solenoid coils when the snowplow is connected to the vehicle. DO/RO DO/RI 70448 Plow Control 1. Verify that the POWER switch (upper switch on Harness Motor headgear) is in the "PLOW"...
  • Page 46 LEFT Solenoid PUMP Motor SV08-2211 S2C1 SV08-47D S2C2 S3C1 Pump SV08-47C S3C2 Return to Reservoir SV08-2211 * 550 psi switch installed on LT and RD plows; 725 psi switch on HD plow. Lit. No. 72188, Rev. 01 September 1, 2020...
  • Page 47 LOWER — ELECTRICAL System Response CAUTION Pump Motor On units with the Scrape Maxx™ down force accessory installed and enabled, the hydraulic pump will cycle ON and OFF DO/RO DO/RI automatically when the vehicle ignition is 70448 Plow ON and the blade is in LOWER/FLOAT mode. Control Harness Motor...
  • Page 48 LOWER — HYDRAULIC LIFT RAM RAISE LOWER DS ANGLE RAM PS ANGLE RAM PSW1 Scrape Maxx™ accessory only: PSW2 200 psi Scrape Lock QUILL S3C2 S3C1 S2C2 S2C1 ANGLE ANGLE TEST RAISE LOWER FLOAT RIGHT LEFT Solenoid PUMP Motor SV08-2211 S2C1 SV08-47D S2C2...
  • Page 49 FLOAT — ELECTRICAL This page applies to snowplows without the Scrape Maxx™ down force accessory installed and enabled. Schematics for Scrape Maxx functions Pump appear at the end of this section. Motor System Response DO/RO DO/RI CAUTION 70448 Plow Battery voltage is supplied to the plow Control module, motor relay, and solenoid coils when Harness...
  • Page 50 FLOAT — HYDRAULIC LIFT RAM RAISE LOWER DS ANGLE RAM PS ANGLE RAM PSW1 Scrape Maxx™ accessory only: PSW2 200 psi Scrape Lock QUILL S3C2 S3C1 S2C2 S2C1 ANGLE ANGLE TEST RAISE LOWER FLOAT RIGHT LEFT Solenoid PUMP Motor SV08-2211 S2C1 SV08-47D S2C2...
  • Page 51 ANGLE RIGHT — ELECTRICAL System Response CAUTION Pump Motor Battery voltage is supplied to the plow module, motor relay, and solenoid coils when the snowplow is connected to the vehicle. DO/RO DO/RI 70448 Plow Control 1. Verify that the POWER switch (upper switch on Harness Motor headgear) is in the "PLOW"...
  • Page 52 ANGLE RIGHT — HYDRAULIC LIFT RAM RAISE LOWER DS ANGLE RAM PS ANGLE RAM PSW1 Scrape Maxx™ accessory only: PSW2 200 psi Scrape Lock QUILL S3C2 S3C1 S2C2 S2C1 ANGLE ANGLE TEST RAISE LOWER FLOAT RIGHT LEFT Solenoid PUMP Motor SV08-2211 S2C1 SV08-47D...
  • Page 53 ANGLE LEFT — ELECTRICAL System Response CAUTION Pump Motor Battery voltage is supplied to the plow module, motor relay, and solenoid coils when the snowplow is connected to the vehicle. DO/RO DO/RI 70448 Plow Control 1. Verify that the POWER switch (upper switch on Harness Motor headgear) is in the "PLOW"...
  • Page 54 ANGLE LEFT — HYDRAULIC LIFT RAM RAISE LOWER DS ANGLE RAM PS ANGLE RAM PSW1 Scrape Maxx™ accessory only: PSW2 200 psi Scrape Lock QUILL S3C2 S3C1 S2C2 S2C1 ANGLE ANGLE TEST RAISE LOWER FLOAT RIGHT LEFT Solenoid PUMP Motor SV08-2211 S2C1 SV08-47D...
  • Page 55 When a high spot in the surface is encountered while plowing, pressure increases on the base QUILL end of the lift cylinder. Once this pressure reaches 425 psi (HD snowplows) or 550 psi (RD and LT S3C2 snowplows), RV2 will open, allowing the blade to S3C1 S2C2 rise up over the high spot.
  • Page 56 RV3 Settings base end of the angle ram on the affected end of 1800 psi for LT and RD snowplows NOTE: The bidirectional CR1 valve is not the blade. If the pressure exceeds 4000 psi, 2000 psi for HD snowplow adjustable.
  • Page 57 FLOAT: BUILD DOWN FORCE – ELECTRIC (Scrape Maxx™ Mode Enabled) System Response CAUTION Pump On units with the Scrape Maxx down Motor force accessory installed and enabled, the hydraulic pump will cycle ON and OFF DO/RO automatically when the vehicle ignition is DO/RI 70448 ON and the blade is in LOWER/FLOAT mode.
  • Page 58 FLOAT: BUILD DOWN FORCE – HYDRAULIC (Scrape Maxx™ Mode Enabled) LIFT RAM 5. Once the blade is on the ground, releasing the RAISE LOWER LOWER function, the pump will continue to DS ANGLE RAM PS ANGLE RAM run and the S2C2 cartridge valve will remain open until the line pressure at the base of the Scrape Maxx™...
  • Page 59 FLOAT: MAINTAIN DOWN FORCE – ELECTRIC (Scrape Maxx™ Mode Enabled) System Response Pump CAUTION Motor On units with the Scrape Maxx down force accessory installed and enabled, DO/RO the hydraulic pump will cycle ON and OFF DO/RI 70448 Plow automatically when the vehicle ignition is Control ON and the blade is in LOWER/FLOAT mode.
  • Page 60 FLOAT: MAINTAIN DOWN FORCE, PUMP OFF – HYDRAULIC (Scrape Maxx™ Mode Enabled) LIFT RAM RAISE LOWER DS ANGLE RAM PS ANGLE RAM PSW1 Scrape Maxx™ Accessory PSW2* Scrape Lock QUILL S3C2 S3C1 S2C2 S2C1 BUILD CYCLE TO TEST PRESSURE MAINTAIN Solenoid TO 200 psi 200 psi...
  • Page 61 FLOAT: MAINTAIN DOWN FORCE, PUMP ON – HYDRAULIC (Scrape Maxx™ Mode Enabled) LIFT RAM RAISE LOWER DS ANGLE RAM PS ANGLE RAM CAUTION On units with the Scrape Maxx down PSW1 Scrape Maxx™ force accessory installed and enabled, Accessory PSW2* the hydraulic pump will cycle ON and OFF automatically when the vehicle ignition is ON and the blade is in LOWER/FLOAT mode.
  • Page 62 FLOAT: Blade Rises to Follow Surface – HYDRAULIC (Scrape Maxx™ Mode Enabled) LIFT RAM (Blade rises to follow contour.) RAISE LOWER CAUTION DS ANGLE RAM PS ANGLE RAM On units with the Scrape Maxx down force accessory installed and enabled, PSW1 Scrape Maxx™...
  • Page 63 TROUBLESHOOTING HOW TO USE THE TROUBLESHOOTING GUIDE ELECTRICAL TESTING Read and understand the electrical circuit All malfunctions of the SnowEx straight blade 1. Go to "Before You Begin" (next page) ® operation information in the Vehicle-Side Electrical snowplows can be categorized as structural, and satisfy the listed conditions.
  • Page 64 (See c. The control is connected in the cab and "SnowEx Straight Blades – Hydraulic ® turned ON. The control power LED is in a System Specifications" in the Hydraulic steady state and is not flashing.
  • Page 65 TROUBLESHOOTING VEHICLE HEADLAMPS Incorrect Operation or No Headlamps BASIC CHECK QUESTIONS SOLUTIONS Fully understand OEM headlamp operation; refer to DRL mode/automatic headlamp functioning? vehicle owner's manual. Correct isolation module kit installed for Verify per Power Match at www.snowexproducts.com. application? OEM lights operating correctly prior to OEM headlamps must be fully operational for correct installation? isolation module operation.
  • Page 66 TROUBLESHOOTING SNOWPLOW HEADLAMPS Incorrect Operation or No Headlamps BASIC CHECK QUESTIONS SOLUTIONS Fully understand OEM headlamp operation; refer to Automatic headlamp functioning? vehicle owner's manual. All harnesses connected at vehicle and Harnesses must be connected for all snowplow and snowplow? headlamp functions.
  • Page 67 TROUBLESHOOTING SNOWPLOW PARK/TURN LAMPS* Incorrect Operation or No Park/Turn Lamps BASIC CHECK QUESTIONS SOLUTIONS OEM park/turn lamps working? Refer to vehicle owner's manual for fuse location and size. All harnesses connected at vehicle and Harnesses must be connected for all snowplow and snowplow? headlamp functions.
  • Page 68 TROUBLESHOOTING SNOWPLOW DRL LAMPS* Incorrect Operation or No DRL Lamps BASIC CHECK QUESTIONS SOLUTIONS Fully understand OEM DRL operation? Refer to vehicle owner's manual for DRL operation. OEM headlamps must be fully operational for correct OEM headlamps and DRLs operating correctly? isolation module operation.
  • Page 69 TROUBLESHOOTING VEHICLE LIGHTING CHECK 1. Verify the operation of all vehicle front lighting The dimmer switch should toggle the Joystick or Hand‑Held Control prior to connecting the snowplow harness. headlamps between high and low beams. The The snowplow plugs do need to be connected high beam indicator on the dash should light 2.
  • Page 70 TROUBLESHOOTING SOLENOID COIL ACTIVATION TEST (SCAT) The main purpose of the SCAT test is to identify 6. Plug the connectors previously unplugged from Off-Truck Testing: Connect the snowplow a problem as being either electrical or hydraulic. the plow module into the matching connectors control into the 4-position control connector on Each snowplow function is activated in turn and the on the diagnostic harness (A to A and B to B).
  • Page 71 Angle Right S3C2, motor relay Angle Left S3C1, motor relay Scrape Maxx™ Active S1, S2C2, motor relay Excerpted from SnowEx Snowplows Solenoid Coil Activation Test (SCAT) Instructions (Lit. No. 86260, Rev. 00). ® Lit. No. 72188, Rev. 01 September 1, 2020...
  • Page 72 TROUBLESHOOTING Solenoid Coil Activation Test (SCAT), continued INDIVIDUAL SOLENOID COIL TEST 1. Remove both wires from coil terminals. After Completing a SCAT Test 2. Attach an ohmmeter across the coil terminals. Turn the snowplow control OFF. 3. A reading that is not approximately 7 ohms Off-Truck Testing: Disconnect the 12V power indicates coil is damaged and must be source.
  • Page 73 TROUBLESHOOTING CONTROL/CABLE/PLOW MODULE TEST To Safely Handle the Printed CONDITION POSSIBLE CAUSE CORRECTIVE ACTION Circuit Board Make sure grille plugs between snowplow and truck are properly Snowplow is not connected. connected. CAUTION With the vehicle switched accessory ON, test the 4-pin connector The circuit board may be damaged by inside the cab.
  • Page 74 TROUBLESHOOTING MOTOR AND MOTOR RELAY TEST 4. Check for switched 12V at the empty large If switched 12V is present at the empty WARNING motor relay terminal while activating any large motor relay terminal, disconnect Keep 8' clear of the blade when it is being control function except LOWER.
  • Page 75 The pump relief valve may be out of adjustment. Turn the relief valve clockwise 1/4 turn and retest the pressure. Repeat until Pressure correct pressure is obtained: 1800 psi for LT and RD blades, Gauge 2000 psi for HD blades.
  • Page 76 TROUBLESHOOTING CARTRIDGE & CHECK VALVE REMOVAL It is possible to remove cartridges and check 6. Attach a hand-operated vacuum pump to the valves from a hydraulic unit without draining the barb fitting. hydraulic fluid from the reservoir. Using the vacuum pump, pull a vacuum of approximately 5 to 10 Hg.
  • Page 77 Lift Ram Base End 425 psi 2-1/4 – 2-1/2 (Scrape Lock) components into the valve block. HD: 2000 psi 2000: 2 Pump Relief     L T: 1800 psi 1800: 2-1/8 RD: 1800 psi Lit. No. 72188, Rev. 01 September 1, 2020...
  • Page 78 TROUBLESHOOTING SCRAPE LOCK ADJUSTMENT 8. Raise the blade high enough to slide a floor jack NOTE: Adjustments should be made in 1/4‑turn under the center of the blade. Lower the blade increments. Follow the instructions below to adjust the pressure onto the jack.
  • Page 79 TROUBLESHOOTING REPLACING DAMAGED BEARING SLEEVES Remove Damaged Bearing Sleeve 4. Turn the hex nut onto the bushing puller pin until the underside of the pin head is snug 1. Remove the reservoir, pump, and motor from against the end of the bearing sleeve. the hydraulic manifold.
  • Page 80 TrynEx International offers a limited warranty for all snowplows and accessories. See separately printed page for this important information. The following are registered ( ) or unregistered (™) ® trademarks of Douglas Dynamics, LLC: Automatixx , POWER GRIP™, Scrape Maxx™, SECURITY GUARD™, SnowEx ® ® Printed in U.S.A.

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