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Sno-Way®, Down Pressure® and EIS® are registered trademarks of Sno-Way International, Inc. ProControl™, MegaBlade™, V-Wing™, E-Z Switch™, Revolution™, MaxAdjust™, SpeedLock™, and QuickJack™ are trademarks of Sno-Way International, Inc. ©2009 Sno-Way® International TABLE OF CONTENTSPage INTRODUCTION ........................................................................................................................2 SAFETY .....................................................................................................................................3 INSTALLATION INSTRUCTIONS ..............................................................................................4 Electrical Installation ........................................................................................................ 4 Mechanical Installation..................................................................................................... 5 Mounting Snow Plow To Vehicle.................................................................................... 10 Installing The Cylinder Lock Clamp .............................................................................. 12 Removing Snow Plow From Vehicle.............................................................................. 13 MAINTENANCE ....................................................................................................................... 15 Break In Period................................................................................................................ 15 To Remove Excessive Free Play.................................................................................... 15 Periodic Inspection......................................................................................................... 15 Plow Storage ................................................................................................................... 15 Polycarbonate Blade Care.............................................................................................. 16 Polycarbonate Blade Cleaning Instructions................................................................. 16 Fluid Requirements ........................................................................................................ 16 Changing Oil and Cleaning Filter Screen ..................................................................... 16 Cutting Edge.................................................................................................................... 18 Disk Shoe Adjustment.................................................................................................... 18 Trip Spring Adjustment .................................................................................................. 18 Emergency Plow Raise................................................................................................... 18 PLOWING OPERATION .......................................................................................................... 19 Operating Class .............................................................................................................. 19 Before the Season Begins.............................................................................................. 19 Transporting Vehicle With Plow Attached .................................................................... 19 Plowing Like A Pro.......................................................................................................... 20 Using The Down Pressure (DP) Hydraulic Systems.................................................... 20 Clearing Driveways......................................................................................................... 20 Clearing Parking Lots..................................................................................................... 20 TROUBLESHOOTING ............................................................................................................. 21 Troubleshooting Quick Reference - General ................................................................ 21 Troubleshooting Charts.................................................................................................. 21 THEORY OF OPERATION ...................................................................................................... 24 Hydraulic Power Unit ...................................................................................................... 24 Hydraulic Controls.......................................................................................................... 24 Electro-Hydraulic Operation .......................................................................................... 24 Raise Mode Of Operation ............................................................................................... 24 Lower Mode Of Operation - Gravity Down and Float ................................................... 24 Down Pressure (DP) System........................................................................................... 25 Angle Left or Right Mode of Operation......................................................................... 25 Fuse.................................................................................................................................. 25 MAIN WIRING HARNESS SCHEMATIC (Energy Interruption System) ...............................26 HYDRAULIC SCHEMATIC (Gravity Down System) .............................................................. 27 HYDRAULIC SCHEMATIC (Down Pressure System) ...........................................................28 WIRING SCHEMATIC (Gravity Down System) With S.N. Before: 29G100300, 29TG100100, 32G100400, 32C100100.......................... 29 WIRING SCHEMATIC (Down Pressure System) With S.N. Before: 26D102300, 29HDD100600, 29TDP100400, 32D102800................... 30 PROCONTROL WIRING SCHEMATIC With S.N. After 26G200000 ...................................... 31 PROCONTROL WIRING SCHEMATIC With S.N. After 26D200000....................................... 32 TORQUE SPECIFICATIONS ................................................................................................... 33 INTRODUCTIONThis manual was written for the assembly, installation and maintenance of your new Sno-Way plow. Most importantly, this manual provides an operating plan for safe use. Refer to the Table of Contents for an outline of this manual. Please keep this manual with your machine at all times as reference material and so it can be passed on to the next owner if the machine is sold. We require that you read and understand the contents of this manual COMPLETELY, especially the chapter on SAFETY, before attempting any procedure contained in this manual. ![]() The Society of Automotive Engineers has adopted this SAFETY ALERT SYMBOL to pinpoint characteristics that, if NOT carefully followed, can create a safety hazard. When you see this symbol in this manual or on the machine itself, BE ALERT!, your personal safety and the safety of others, is involved. • Defined in the next column, are the SAFETY ALERT messages and how they will appear in this manual.
NOTE: Additional information concerning the equipment or the procedure that may or may not be contained elsewhere in this manual. BE AWARE! It is illegal to remove, deface or otherwise alter the safety decals mounted on this equipment. Record the Power Pack Model Number, Power Pack Serial Number, Controller Serial Numbers, Blade Model Number, Blade Serial Number and the Pump Serial Number in the space provided below as a handy record for quick reference. The Power Pack Serial Number is located on the A-Frame (driver’s side near the front), the Blade Serial Number is located on one of the middle ribs of the blade. This plate contains information that your Dealer needs to answer questions or to order replacement parts, if needed, for your unit. NAME PLATE DATAPOWER PACK MODEL NUMBER POWER PACK SERIAL NUMBER (Located on A-Frame) CONTROLLER SERIAL NUMBERS: TRANSMITTER S.N. RECEIVER S.N. BLADE MODEL NUMBER BLADE SERIAL NUMBER (Located on Blade Frame) PUMP SERIAL NUMBER (FILL IN) DEALERNAME ADDRESS
ADDRESS CITY STATE ZIP PHONE ( ) – (FILL IN) We reserve the right to make changes or improve the design or construction of any part(s) without incurring the obligation to install such parts or make any changes on any unit previously delivered. Graphics and illustrations may be used which may show equipment and/or options not included in every installation without incurring the obligation to install such parts or make changes on units previously delivered. Sno-Way Service Parts Manuals are available for purchase from your authorized Sno-Way dealer. Request part number 97100829 for the 29 & 32 Series Snow Plows. Factory contact information is available at www.snoway.com. Snow-Way Products are built under one or more of the following patents: 5,524,368 5,832,637 5,894,688 5,987,785 6,154,986 6,691,435 6,701,646 6,702,208 6,775,933 6,778,932 6,860,039 6,860,040 2,121,948 SAFETYBEFORE ATTEMPTING ANY PROCEDURE IN THIS BOOK, READ AND UNDERSTAND ALL THE SAFETY INFORMATION CONTAINED IN THIS SECTION. IN ADDITION, ENSURE ALL INDIVIDUALS WORKING WITH YOU ARE ALSO FAMILIAR WITH THESE SAFETY PRECAUTIONS. For your safety Warning and Information Decals have been placed on this product to remind the operator to take safety precautions. It is important that these decals are in place and are legible before operation begins. New decals can be obtained from Sno-Way or your local dealer. REMEMBER The careful operator is the best operator. Most accidents are caused by human error. Certain precautions must be observed to prevent the possibility of injury to operator or bystanders and/or damage to equipment. NEVER operate plow when under the influence of alcohol, drugs or other medications that could hamper your judgement and reactions. An accident may result in serious injury or death to other persons or yourself. ALWAYS operate vehicle in a well-ventilated area. The carbon monoxide in exhaust gas is highly toxic and can cause serious injury or death. NEVER allow hands, hair or clothing to get near any moving parts such as fan blades, belts and pulleys. Never wear neckties or loose clothing when working on the vehicle. NEVER wear wrist watches, rings or other jewelry when working on the vehicle or individual equipment. These things can catch on moving parts or cause an electrical short circuit that could result in personal injury. ALWAYS wear safety goggles when working on the vehicle to protect your eyes from battery acid, gasoline, and dust or dirt from flying off of moving engine parts. ALWAYS be aware of and avoid contact with hot surfaces such as engine, radiator, and hoses. ALWAYS wear safety glasses with side shields when striking metal against metal! In addition, it is recommended that a softer (non-chipable) metal material be used to cushion the blow. Failure to heed could result in injury to the eye(s) or other parts of the body. NEVER allow children or unauthorized person to operate this unit. NEVER exceed 45 m.p.h. when snow plow is attached to vehicle. Braking distances may be increased and handling characteristics may be impaired at speeds above 45 m.p.h. ALWAYS lock the vehicle when unattended to prevent unauthorized operation of the plow. ALWAYS check the job site for terrain hazards, obstructions and people. NEVER exceed 10 m.p.h. when plowing. Excessive speed may cause serious injury and damage of equipment and property if an unseen obstacle is encountered while plowing. ALWAYS position blade so it does not block path of headlamps beam. Do not change blade positions while traveling. An incorrect plow position blocking headlamp beam may result in an accident. ALWAYS check surrounding area for hazardous obstacles before operating this unit. ALWAYS inspect the unit periodically for defects. Parts that are broken, missing or plainly worn must be replaced immediately. The unit, or any part of it should not be altered without prior written approval of the manufacturer. ALWAYS insert the cylinder lock when plow is not in use. If the cylinder lock is not installed, the plow blade could inadvertently drop and cause injury. ALWAYS shut off the vehicle engine, place the transmission in Neutral or Park, turn the ignition switch to the “OFF” position, firmly apply the parking brake of the vehicle and turn "OFF" the plow controller before attaching or detaching the blade from the vehicle or when making adjustments to the blade. ALWAYS inspect lift system bolts and pins whenever attaching or detaching the plow, and before traveling. Worn or damaged components could result in the plow dropping to the pavement while driving, causing an accident. ALWAYS keep hands and feet clear of blade and A-Frame when attaching or detaching plow. NEVER place fingers in A-frame or mount lug holes to check alignment when attaching snow plow. Sudden motion of the plow could severely injure a finger. NEVER stand between the vehicle and blade or directly in front of blade when it is being raised, lowered or angled. Clearance between vehicle and blade decreases as blade is operated and injury or death can result from blade striking a body or dropping on hands or feet. NEVER work on the vehicle without having a fully serviced fire extinguisher available. A 5 lb or larger CO2 or dry chemical unit specified for gasoline, chemical or electrical fires, is recommended. NEVER smoke while working on the vehicle. Gasoline and battery acid vapors are extremely flammable and explosive. NEVER use your hands to search for hydraulic fluid leaks; escaping fluid under pressure can be invisible and can penetrate the skin and cause injury! If any fluid is injected into the skin, see a doctor at once! Injected fluid MUST be surgically removed by a doctor familiar with this type of injury or gangrene may result. REMEMBER it is the owner’s responsibility for communicating information on the safe use and proper maintenance of this machine. INSTALLATION INSTRUCTIONSGeneralInstall the subframe on the vehicle using the instructions supplied with the subframe package. The pin height should be 8" - 10" off the ground. (See Figure 1-1). Figure 1-2
![]() ![]() Figure 1-1 nuts and cover. Electrical Installation1. Remove the battery power harness and power harness parts bag from the power pack carton. NOTE: Take extra time needed to plan the routing of wiring harnesses. Make sure harnesses do not interfere with, or contact, any moving parts and route wires away from excessive heat areas. Read all the instructions carefully to ensure a safe and professional installation.
16. Apply included dielectric grease to all connectors. NOTE: An adapter is recommended for vehicles with a side post battery. (See Figure 1-3). (Adapters can be purchased from your Sno-Way dealer, Part #96100773 ![]() Figure 1-3 Mechanical InstallationIMPORTANT: Graphics and illustrations may be used which may show equipment and/or options not included in every installation. Assemble Blade, Swing Frame and Trip Springs (29, 29HD, & 32 Series)
NOTE: The 29 Series blade uses green stops and the 32 Series blade uses black stops. Make sure the proper stops are installed for the blade being used. ![]() ![]() Figure 1-4b (New Swing Frame - Forwards and Backwards Compatible)
![]() NOTE: Make sure cotter pin is properly bent or pin may work loose (See Figure 1-6). ![]() ![]() ![]() ![]() Figure 1-7c (32 Series) 8b. 32 SERIES BLADE ONLY: Hook other end of spring onto eyebolt. Insert two eyebolts on each side of the blade into the two lower holes on the swing frame spring bracket. Use a jam nut on either side of bracket to secure. (See Figure 1-7c). 9. Tighten springs until a .010" feeler gauge can pass between two or more coils (a 3x5 postcard is approximately .010").
Assemble Blade, Swing Frame and Trip Springs (29T Series)
![]() ![]() Figure 1-9
![]() 7. Fit the trip spring assemblies to the blade (See Figure 1-11).): Remove (2) 1"-8 x 11-1/2" hex bolts, (2) 1"-8 locking nuts and (2) shock bushings from the kit box. Enter the end of the rod of one of the spring assemblies through the outermost of the holes of the upper blade spring brackets. While holding the spring assembly hard up against the spring bracket, push the 1" bolt through the saddle, just entering it into the outermost of the holes of the upper blade spring brackets. While holding the spring assembly hard up against the spring bracket, push the 1" bolt through the saddle, just entering it into the outermost rib of the lower blade lever-arm. Locate (1) shock bushing between the lower blade lever-arm ribs and align it with the 1" bolt hole, then push the 1" bolt through the shock bushing enough to protrude beyond the lever-arm by about 1/2". Now locate a second spring assembly into the inner hole of the upper blade spring bracket and locate the saddle over the protruding bolt. Push the bolt all the way through the saddle assemblies, holding the inner saddle in place, and fit the 1" lock nut. Tighten the locknut onto the bolt sufficiently to loosely hold the saddle assemblies against the lever-arm ribs. Repeat on the other side of the swing frame. ![]() Figure 1-11 8. Adjust the trip spring loading (See Figure 1-12).): Screw the 3/4" nut, adjacent to the lower spring cup, along the threaded rod so as to compress the spring to an overall compressed length of 16", measured over the spring cups. Run the remaining nut up to the underside of the adjusting nut and firmly lock them together. Repeat for all spring assemblies. ![]() Complete Installation (All Series)
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10. Secure light bar to supports with (4) 3/8" x 1" screws and lock nuts. Align light bar supports to vertical position and tighten all light bar hardware. Tighten eight lower screws to 45 lb-ft. (See Figure 1-15). Mount lamps on light bar using supplied 1/2" lock washers and nuts. (See Figure 1-16). ![]() 9. Remove left and right light support from power pack carton. Secure each light bar support to lift/light bar with (4) 3/8" x 1" screws, (8) washers and (4) lock nuts from the light bar parts bag, part number 96106089. Do not tighten at this time. (See Figure 1-15). ![]() Figure 1-16
NOTE: In order to conform to Federal Motor Vehicle Safety Standards a SAE J602 Approved aiming device must be used to aim plow lights. 2. Plug in power harness and remove controller from Mounting Snow Plow To Vehicletruck cab. Plug controller into plow. 1. Drive truck into plow. Align light/lift bar frame inside of subframe lugs. Pins should fit inside slots cut into subframe lugs. (See Figure 1-17). ![]()
Figure 1-17 NOTE: If pins are too high or low to fit into slots on sub-frame, adjust the height by plugging in the plow and hand held controller. For Down Pressure Plows - To lower the pins, turn on down pressure and press down. To raise the pins, press up. For Gravity Plows -To lower the pins, place plow in float and push up on light bar. To raise the pins, press up.
3. Rotate light/lift bar into position by turning on down pressure and pressing the lower button. (See Figure 118). ![]() Figure 1-18 NOTE: If your plow is not equipped with down pressure hydraulics you will have to manually rotate the light / lift bar into position by placing plow in float mode and pushing on the light bar. 4. Put plow into float position by turning down pressure off. Rotate pin handles down to lock pins in place. (See Figure 1-19).
NOTE: Upper hitch pins are fully engaged when pin handle is tight against pin bracket and you cannot see the upper hitch pin between the pin bracket and pin handle. If upper hitch pins are not fully engaged: A. Raise plow an inch off the ground, then lower. Or, B. Turn Down Pressure ON and then OFF. Upper hitch pins will snap into place. ![]() Figure 1-19
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![]() Figure 1-22
7. Unplug light harness connectors on truck, and disconnect plow light connectors, which had been plugged together for corrosion protection during storage. (See Figure 1-21). Installing The Cylinder Lock Clamp ![]()
![]() 5. Position the cylinder lock clamp around the exposed (chrome) portion of the lift cylinder with the open side of the cylinder lock up. Install the pin. (See Figure 1-23). Figure 1-24
![]() ![]() ![]() Failure to lower plow onto clamp could block headlights resulting in an accident. FAILURE TO FOLLOW CAN RESULT IN INJURY OR DEATH Removing Snow Plow From VehicleChoose a location for the plow storage, which will allow the plow to be removed from the vehicle and not be moved after removal. Also, choose a location that will not allow the plow stand to sink into the ground. A dry, protected area is recommended.
![]() Failure to reconnect the main light harness on the truck when removing plow will cause truck lights to not operate, which could cause an accident. Test lights before operating. FAILURE TO FOLLOW CAN RESULT IN INJURY OR DEATH . ![]() CAUTIONWhen disconnecting the plow control harness, turn only the locking nut at the end of the connector. Do not turn the threaded boot. Turning the threaded boot will break the wires in the harness and cause the controller to stop functioning. (See Figure 1-26). 29D102300, 29HDD100600, 29TDP100400, 32D102800 Figure 1-26![]()
![]() ![]() ![]() Figure 1-28 MAINTENANCEGeneral
IMPORTANT: Hydraulic fluid packaged with power unit is Type 5606. If additional oil is added it must be compatible with Type 5606. If another type of oil has been used in the system the same type of oil must be used for topping off the system.
Break In PeriodThe plow will go through a break in period during which the A-frame and swing frame will settle in. After 15-20 hours of operation check for free play of the A-frame and swing frame pivot.
To Remove Excessive Free Play1. Tighten the pivot bolt nut (typically 1/6 to 1/3 turn, one or two flats). Periodic InspectionAfter every 20 hours of operation perform the following inspections:
![]() Figure 2-1 4. If wear is noticed between the A-frame and the swing frame apply a good quality anti-seize lubricant to this area. Plow StorageWhen storing the plow for long periods of time use the following guidelines.
Polycarbonate Blade Care
DO NOT use abrasive or highly alkaline cleaners on polycarbonate blade. Never scrape polycarbonate blade with squeegees, razor blades or other sharp instruments. DO NOT clean polycarbonate blade in hot sun or at elevated temperatures. Polycarbonate Blade Cleaning InstructionsWash with a mild soap or detergent and luke-warm water using a clean cloth or soft sponge. Dry thoroughly with a chamois or moist cellulose sponge to prevent water spots. Fluid RequirementsIMPORTANT: Hydraulic unit comes from factory supplied with type 5606 hydraulic oil. If additional oil is added it must be compatible with Type 5606. It is recommended that the fluid in the hydraulic system be changed once a season. NOTE: Type 5606 oil is rated to -60 deg. F, when Type 5606 is not available Exxon UNIVIS J13 or equivalent may be used. Do NOT use synthetic oil. Oil must contain an anti-foam additive. Changing Oil and Cleaning Filter ScreenNOTE: We recommend cleaning the filter screen at every oil change; this will help ensure maximum life and maximum performance from the pump assembly.
![]() Figure 2-2
NOTE: If the oil has not been previously removed from the reservoir, the power unit can be rotated and tipped to allow most of the oil to be drained out of the reservoir filler hole, once the filler cap is removed. ![]() Figure 2-3
![]() Figure 2-4
CAUTIONDo Not use Teflon tape or pipe dope on hydraulic fittings. These can dislodge and jam valves in the hydraulic system. 20. Fill the hydraulic reservoir with type 5606 hydraulic fluid until the fluid registers full on the sight line. NOTE: Vehicle must be parked on level ground and plow must be in lowered position in order to properly check the reservoir level.
Operate system and check for leaks. Repair and replace components as necessary. Cutting EdgeNOTE: Cutting edge must be replaced when it is worn to the bottom edge of the frame.
Remove mounting bolts holding old cutting edge to blade. Discard old cutting edge and hardware. Consult parts manual for proper replacement cutting edge. 7. Install new cutting edge using new hardware. Disk Shoe Adjustment
![]() ![]() Figure 2-6 (29 HD Series) 6. After the disk shoe position is properly adjusted place washer on the shoe stem - above the disk shoe mounting bracket and below the retaining lynch pin - to remove all up and down movement of the disk shoe in the bracket. Failure to do so will result in excessive wear of the holes in mounting bracket or bending of the disk shoe stem. IMPORTANT: Snap lynch pin ring over so that it contacts the pin. If ring does not contact lynch pin, rotate the pin and reverse the direction of the ring. If the ring does not contact the pin it is not locked and could fall out. Trip Spring AdjustmentSee "Mechanical Installation" on page 5. Emergency Plow RaiseIf your snowplow becomes inoperable for any reason, follow the instructions below to raise the plow for transport to your nearest Sno-Way Dealer.
Failure to place a jack stand under the plow could result in the plow rapidly falling. FAILURE TO FOLLOW CAN RESULT IN INJURY OR DEATH ![]()
PLOWING OPERATIONOperating ClassThe 29 Series Sno-Way plow is specifically designed for heavy commercial applications on 3/4 and 1-ton trucks. In some applications, the 29 series can be used on 1/2 ton trucks. The 32 Series Sno-Way plow is specifically designed for heavy commercial applications on trucks with a GVWR of 10,000 to 19,000 lbs. The 8-1/2’ and 9’ blades can also be installed on many 3/4 ton trucks. Before the Season Begins
Transporting Vehicle With Plow Attached1. Always install the cylinder lock clamp when the plow is raised and the operator is not engaged in plowing operations. NOTE: If cylinder lock clamp is not installed during transport equipment failure or inadvertent operation of the controls could allow the plow to fall.
Plowing Like A Pro
NOTE: The air bag is factory set to deploy at a certain acceleration level. The air bag will deploy with the plow attached if an obstruction is hit with enough force to reach this level. Always plow within the recommended plowing speeds and know the area you are plowing to avoid any obstructions. NOTE: For better clean up of hard packed snow; raise the disc shoes so that the cutting edge of the blade comes into direct contact with pavement. Use the lowest possible gear to place maximum power behind the cutting edge. For instructions on using the plow controller to manipulate the plow see the manual included with your plow control package.
Using The Down Pressure (DP) Hydraulic SystemsThe DP system was designed for removing hard packed snow from hard surfaces that has been driven on prior to plowing. The system should be turned OFF when plowing surfaces such as gravel, dirt, sand, etc., to prevent cutting into the surface. Activating the system applies down pressure to the down pressure side of the lift cylinder. This down pressure will force the cutting edge through hard packed snow. If down pressure decreases as a result of a low spot, more down pressure will be applied to the lift cylinder. When a high spot is encountered the down pressure will be relieved to allow the plow to follow the contour without lifting the front of the truck. Clearing Driveways
Clearing Parking Lots
TROUBLESHOOTINGIntroductionWhenever service is necessary, your local dealer knows your plow best and is interested in your complete satisfaction. Return your snowplow to your local dealer for maintenance service or any other assistance you may require. If you are unable to do so, this trouble-shooting guide should help you determine the problem. However, before attempting the servicing of your plow, you should possess good mechanical abilities and a total understanding of the mechanism. PLEASE: Before calling parts and service personnel be certain that:
You have the following available: A. Date snowplow was originally installed B. Power Pack Serial Number C. Controller Serial Number D. Blade Serial Number E. Pump Serial Number This information should be recorded on page 2 of this Owners Manual. Troubleshooting Quick Reference - General
Check vehicle electrical system for proper operation. Check oil level in hydraulic system reservoir. TROUBLESHOOTING CHART
TROUBLESHOOTING CHART
TROUBLESHOOTING CHART
THEORY OF OPERATIONHydraulic Power UnitThe hydraulic power unit consists of: 12V DC Motor Hydraulic pump rated at 1.54 GPM @ 1500 PSI 1.35 quart capacity reservoir fine mesh intake and return filters Filter screens on all outlet ports The fluid supply line for the pump is submerged in the hydraulic fluid reservoir and is equipped with a fine mesh intake filter screen. The 12V DC motor is protected electrically by a 250 amp fuse located between the battery and the motor solenoid. The hydraulic pump is protected by a 2100 PSI system relief valve. If this unit is equipped with a down pressure option, this will allow the operator to selectively switch the system to provide additional hydraulic force to the cutting edge of the plow. IMPORTANT: For proper operation, ProControl system solenoid coils require a minimum of 10.5 volts DC, while earlier system coils require a minimum of 9.5 volts DC. Lower voltage will cause erratic operation, or failure to operate. Hydraulic ControlsThe hydraulic controls consist of:
Electro-Hydraulic OperationAll hydraulic functions are controlled by the 12V DC electrical system which energize coils on the hydraulic valve and the power unit motor start solenoid. Control systems using this style controller (Figure 3-1) when turned ON send +12V DC power to all valve coils. ![]() Figure 3-2 All systems employ ground switching to energize the hydraulic valve coils. The individual coils are energized as required when the control circuit board or receiver module completes the coil circuit path to ground by means of a signal from the wired or wireless hand-held controller in the vehicle. Raise Mode Of OperationActuating the ’Raise’ switch on the hand-held controller sends a signal to the control circuit board on the plow, which then actuates the motor start solenoid and the coil for the ’C’ valve. Actuating the start solenoid sends current to the power unit motor to cause the power unit to pump hydraulic fluid. Hydraulic fluid under pressure is directed through the ’C’ valve to the lift cylinder causing it to extend and raise the plow. On down pressure plows, the ’F’ valve is also actuated to allow fluid in the rod end of the double acting raise cylinder to return to the reservoir. When the ’Raise’ switch on the hand-held controller is released, the start solenoid circuit is broken, the motor stops, the circuit to the coil for the ’C’ valve and (if a down pressure plow) the ’F’ valve is broken and these valves go to their normally closed positions. ![]() Lower Mode Of Operation - Gravity Down and FloatActuating the ’Lower’ switch on the hand-held controller sends a signal to the control circuit board on the plow. This actuates the coil for the ’B’ valve and (if a down pressure plow) the ’F’ valve, allowing hydraulic fluid to flow from the lift cylinder to the reservoir. Once the ’Lower’ switch has been actuated, the system will stay in this mode until the ’Raise’ function is actuated or control is shut off, allowing hydraulic fluid to flow between the reservoir and the lift cylinder. This allows the lift cylinder to extend and retract as necessary to follow ground contours while plowing. Down Pressure (DP) SystemThis system operates only when both the ’DP’ switch and the ’Lower’ switch on the hand-held controller are actuated. Actuating the ’DP’ switch actuates the pressure switch, the ’B’ valve coil, the ’E’ valve coil and, through the pressure switch, the start solenoid as required. When the ’E’ is actuated and the hydraulic pump operates, hydraulic fluid is directed to the rod end of the lift cylinder, retracting the cylinder and forcing the plow down. The pressure switch in this system senses the pressure of the fluid in the lift cylinder and closes when the pressure becomes low, allowing the motor and the pump to pump fluid into the rod end of the cylinder. When the pressure reaches the proper level the switch opens, shutting off the motor and the pump. The system is protected by a relief valve, which relieves excess pressure if the plow is forced up, such as by a bump or obstacle in the roadway. Once any obstacle is cleared, the plow can return to a lower position, which will also lower the pressure. If the pressure becomes too low, the pressure switch will activate the motor and pump as mentioned above to return pressure to normal levels. The down pressure system is overridden any time the plow control is placed in the ’Raise’ mode, but will resume when placed back in the ’Lower’ position. Also, note that the ’E’ valve is deactivated anytime an angle function is activated, but returns to its previous condition as soon as the angle function is completed. Angle Left or Right Mode of OperationActuating the ’Angle Right’ switch on the hand-held controller sends a signal to the control circuit board on the plow. This actuates the start solenoid and the coil for the ’A’ valve, allowing hydraulic fluid under pressure to flow through the ’A’ valve to the swing cylinder. At the same time, the hydraulic fluid passing through the ’A’ valve unseats a check valve in the circuit for the ’D’ valve, allowing hydraulic fluid to flow from the opposite swing cylinder through the ’D’ valve and back to the reservoir. Actuating the ’Angle Left’ switch on the hand-held controller sends a signal to the control circuit board on the plow. This actuates the start solenoid and the coil for the ’D’ valve, allowing hydraulic fluid under pressure to flow to the swing cylinder. This fluid also unseats a check valve in the circuit for the ’A’ valve, allowing fluid to flow from the opposite swing cylinder through the ’A’ valve and back to the reservoir. The angle circuits are protected by a crossover relief valve set to relieve pressure on the circuit a 2400 PSI. If the blade of the plow contacts an obstacle during plowing operations, the crossover relief valves will allow fluid to flow out of the swing cylinder on the side encountering the obstacle, allowing the cylinder to retract and allowing the blade to adjust its angle to relieve the force from the outside. FuseA fuse is located near the battery in the primary 12V DC positive power circuit and is in place to protect the electrical system against direct shorts. A high amp draw condition will cause the element in the fuse to interrupt current flow to the plow. The fuse will need to be replaced after interruption. MAIN WIRING HARNESS SCHEMATIC (Energy Interruption System)![]() HYDRAULIC SCHEMATIC (Gravity Down System)LEFT CYLINDER RIGHT CYLINDER
C1 CROSSOVER RELIEF VALVE 2400 PSI CROSS OVER RELIEF VALVE 2400 PSI PILOT OPERATED CHECK VALVES RIGHT ANGLE VALVE A
LEFT ANGLE VALVE D GP HYDRAULIC SCHEMATIC (Down Pressure System)RAISE CYLINDER UP LEFT CYLINDER RIGHT CYLINDER C4 C2 C1C3 CROSSOVER DP PRESSURE
SWITCH 525 PSI DP RELIEF VALVE CROSSOVER 680 - 720 PSI RELIEF DP FLOAT / DP VALVE 2400 PSI VALVE B PILOT OPERATED RAISE / FLOAT CK
VALVE VALVES F CHECK VALVE LEFT ANGLE DP VALVE RAISE VALVE RIGHT ANGLE VALVE VALVE E C A D CHECK VALVE GP 12VDC SYSTEM RELIEF
MOTOR PUMP
WIRING SCHEMATIC (Gravity Down System) With S.N. Before: 29G100300, 29TG100100, 32C100100![]() WIRING SCHEMATIC (Down Pressure System)With S.N. Before: 29D102300, 29HDD100600, 29TDP100400, 32D102800![]() ![]() WIRING SCHEMATIC (Gravity Down System) With S.N. After 29G200000![]() ![]() WIRING SCHEMATIC (Down Pressure System) With S.N. After: 29HDD200000, 32D200000![]() TORQUE SPECIFICATIONS
DO NOT use these values if a different torque value or tightening procedure is given for a specific application. Fasteners should be replaced with the same or higher grade. If higher grade fasteners are used, these should only be tightened to the strength of the original. a “Lubricated” means coated with a lubricant such as engine oil, or fasteners with phosphate and oil coatings. b “Dry” means plain or zinc plated without any lubrication * Values with asterisk are in lb-in. NOTESSNO-WAY® INTERNATIONAL, INC.
DEALER PRE DELIVERY CHECKLISTThe following inspections MUST be accomplished prior to delivering the snowplow to the customer. Place an X x in the box after accomplishing each item on the checklist. CHECK THAT Parts have not been damaged in shipment. Repair or replace items that are loose, dented or missing. All covers, guards and decals are in place and attached securely. All pivot pins and cotters are installed and secure. Trip springs are adjusted. Shoe assemblies are installed and adjusted. Snow plow headlamps are adjusted properly. Snow plow headlamps are functional.
ALL blade functions work properly. Cylinders, hoses and fittings DO NOT leak. Listen for abnormal noises or vibrations; Repair or replace as necessary. The Power Unit is properly filled. DELIVERY CHECKLISTxThe following checklist is to be accomplished with the customer present, Place an X in the box after accomplishing each item on the checklist. After giving the Customer his Owner’s Manual, instruct him to read it PRIOR to operating the Snow Plow. If he has any questions or does not understand part(s) of the Manual, ask him to contact the Dealer for answers or explanations BEFORE operating the unit. Record the Serial Numbers, Date of Purchase, Purchaser’s Name and Address, and the Dealers Name, Address and Phone Number in the space provided on Page 1 of the Owner’s Manual. Explain mounting and removal procedures. Demonstrate power plow controller operation. Demonstrate cylinder lock clamp installation. Demonstrate Down Pressure hydraulic system function and operation. (If unit is so equipped) Fill out Warranty Registration Card and mail COPY 1 to the factory to validate Warranty. NO Warranty claims can be honored if the Warranty Card is not on file at the factory. SNO-WAY® INTERNATIONAL, INC.
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