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939 Sno-Thro
Service Manual
Models 939001, 939002, 939300
01920500 12/06
Printed in USA

Summary of Contents

  • Page 1

    939 Sno-Thro Service Manual Models 939001, 939002, 939300 01920500 12/06 Printed in USA...

  • Page 2: Table Of Contents

    1.0 Introduction ..... . .1-5 1.1 The Manual ..... . .1-5 1.2 Service and Replacement Parts .

  • Page 3

    Facsimile (920) 756-2407 We the undersigned, ARIENS COMPANY, certify that: Nous, soussignés ARIENS COMPANY, certifions que : Der Unterzeichnete, ARIENS COMPANY, bescheinigt, dass: La sottoscritta società ARIENS COMPANY certifica che: Nosotros, los abajo firmantes, ARIENS COMPANY, certificamos que: Undertegnede, ARIENS COMPANY, bekrefter at: Undertecknad, ARIENS COMPANY, intygar att: Allekirjoittanut, ARIENS COMPANY, vakuuttaa, että: My, niŸej podpisani, ARIENS...

  • Page 4

    – Vibrasjonsmåling ved brukerens hender – Vibrationsmätning vid förarens händer – Tärinä kuljettajan käsissä – Pomiar ) na rêkach operatora – Hodnota vibrací (m/s wibracji (m/sec Ariens Company Brillion, WI 54110-0157 USA Signature Signature Unterschrift Firma Firma Signatur Namnteckning...

  • Page 5: Introduction, The Manual, Service And Replacement Parts, Product Registration, Unauthorized Replacement Parts, Disclaimer

    Figure 1 SECTION 1 - INTRODUCTION 1.3 PRODUCT REGISTRATION The Ariens dealer must register the product at the time of purchase. Registering the product will help the company process warranty claims or contact you with the latest service information. All claims meeting...

  • Page 6: Safety, Safety Alerts, Notations, Practices And Laws, Required Operator Training, Safety Decals And Locations

    Service Letter - General technical information for the dealer. Technical information on how to service the product and product improvements. Service Bulletin - Notification to update products to resolve certain issues or a notification of a policy change. 2.1 SAFETY ALERTS WARNING: To avoid injury to hands and feet, always disengage clutches, shut off engine, and wait for all movement to stop before...

  • Page 7: Preparation, Service Position

    Read Owner/Operator Manual. OL1801 Keep people away from unit while operating. Keep children out of work area and under watchful care of a responsible adult. OL4370 Never direct discharge towards persons or property that may be injured or damaged by thrown objects. OL0910 Stop engine, remove key, read manual before making any repairs or...

  • Page 8: Cleaning And Storage

    2.8 CLEANING AND STORAGE WARNING: AVOID SHARP EDGES which can cut. Movement of parts can cut off fingers or a hand. Wear gloves, and use extreme caution when servicing. IMPORTANT: Never spray unit with water or store unit outdoors to help prevent sealed bearing rust or corrosion.

  • Page 9

    DO NOT throw snow any higher than necessary. Deflected materials can cause injury and property damage. Always stand clear of the discharge area when operating this unit. Fumes from engine exhaust can cause injury or death. DO NOT run engine in an enclosed area. Always provide good ventilation.

  • Page 10

    ALWAYS keep protective structures, guards, and panels in good repair, in place and securely fastened. NEVER modify or remove safety devices. DO NOT change engine governor settings or over- speed engine. Fumes from engine exhaust can cause injury or death. DO NOT run engine in an enclosed area.

  • Page 11: Gear Case, General Maintenance & Adjustments, Controls And Features

    SECTION 4 - GENERAL MAINTENANCE & ADJUSTMENTS 4.1 CONTROLS AND FEATURES OS7350 OS7355 1. Attachment Clutch Lever 2. Traction Drive Clutch Lever 3. Chute Handle (939001, 002) 4. Discharge Chute Deflector 5. Discharge Chute 6. Impeller 7. Clean-Out Tool 8. Auger 9.

  • Page 12: Service Position, Stopping In An Emergency, Starting And Shutting Off

    Ariens dealers provide any service or adjustments required to keep your unit operating at peak efficiency. Should engine service be required, contact an Ariens dealer or an authorized engine manufacturer's service center. WARNING: AVOID INJURY. Read and understand the entire Safety section before proceeding.

  • Page 13: Fuel Tank, Pre-start

    6. Insert key into ignition switch on engine and push into RUN position. DO NOT twist key after it is inserted. 7. If engine is cold, apply choke. A warm engine requires less choking than a cold engine. See Engine Manual for detailed instructions. 8.

  • Page 14: Maintenance Schedule

    IMPORTANT: DO NOT allow grease or oil to get on the belts. NOTE: Apply Ariens Hi-Temp Grease or equivalent to the lubrication fittings. See “Service Parts List” on page 32. Lubricate Sno-Thro at the beginning of the season or every 25 operating hours, whichever comes first.

  • Page 15: Attachment Drive Belt Replacement

    Auger Shaft To grease auger shaft, remove shear bolt nuts and shear bolts. Apply grease at the grease zerks and then rotate the auger shaft. Replace shear bolts per instructions in “Shear Bolts” on page 17. Grease Oil OS1374 Figure 6 4.8 ATTACHMENT DRIVE BELT REPLACEMENT Remove Attachment Drive Belt...

  • Page 16: Traction Drive Belt Replacement

    Replace Attachment Drive Belt 1. Place new belt onto lower pulley. 2. While holding brake out of way, tip unit together. NOTE: Engage attachment clutch lever while connect- ing housing to frame to hold brake out of the way. 3. Attach blower housing to frame with cap screws removed in step 5 of “Remove Attachment Drive Belt”...

  • Page 17: Shear Bolts, Tire Pressure, Service And Adjustments, Discharge Chute Deflector, Discharge Chute

    4.10 SHEAR BOLTS IMPORTANT: Use only Ariens shear bolts for replacement. Use of any other type of shear bolt may result in severe damage to unit. Occasionally a foreign object entering the blower housing may jam the auger and break the shear bolts (Figure 11) that secure the auger to the shaft.

  • Page 18: Runners, Attachment Clutch/brake Adjustment

    5.3 RUNNERS Runners should be adjusted as conditions require (Figure 14). 1. Position unit on a hard, flat, smooth level surface. 2. Adjust runners by inserting a spacer of desired thickness under center of scraper blade, loosen runner hardware, slide runners to flat surface. Allow 1/8 in.

  • Page 19: Traction Drive Clutch Adjustment

    4. Remove two screws securing belt cover to unit and remove belt cover. 5. Adjust the attachment idler position. a. Loosen attachment idler nut (Figure 8). b. To increase distance between clutch lever and handlebar, move the idler towards the attachment belt.

  • Page 20: Handlebars & Controls, Inspect Lower Handlebar, Replace Lower Handlebar, Traction Drive Clutch Lever And Cable

    SECTION 6 - HANDLEBARS & CONTROLS 6.1 INSPECT LOWER HANDLEBAR 1. Remove bolts attaching lower handlebar to each side of frame (2 places, each side) (see Figure 20). 2. Remove handlebar assembly. 3. Check lower handlebar parts for wear or replacement 4.

  • Page 21: Attachment Control Lever And Cable

    1. Bolt (2-1/2") 2. Flange Bushing 3. Clutch Lever (Right Hand) 4. Jam Nut 5. Flat Washer 6. Sleeve Bushing 7. Bushing 8. Torsion Spring 9. Retaining Ring 10. Traction Cable 14. Spring 11. Clutch Lever (left Hand) 15. Pulley 12.

  • Page 22: Engine, Engine Troubleshooting

    7.1 ENGINE TROUBLESHOOTING The following troubleshooting chart is to be used to isolate engine problems and give possible causes and corrective action responses. PROBLEM Black Exhaust Restriction in air cleaner Poor compression Incorrect grade of fuel Leaking cylinder head gasket Sticking valves Worn cylinder bores Pitted valves and seats...

  • Page 23

    PROBLEM Excessive Fuel Restriction in air cleaner Consumption Poor compression Incorrect grade of fuel Sticking throttle/restricted movement Leaking cylinder head gasket Worn oil pump Worn cylinder bores Pitted valve stems and seats Broken, worn, or sticking piston rings High Oil Pressure Incorrect grade of lubricating oil Pressure relief valve sticking closed Knocking...

  • Page 24

    PROBLEM Poor Compression Leaking cylinder head gasket Incorrect tappet adjustment Sticking valves Worn cylinder bores Pitted valves and seats Broken, worn, or sticking piston ring(s) Worn valve stems and guides Broken valve spring Starts and Stops Restriction in air cleaner Fuel tank empty Choked fuel filter Bad spark plugs...

  • Page 25: Engine Removal, Engine Installation

    7.2 ENGINE REMOVAL Figure 22 CAUTION: Remove fuel from fuel tank before removing engine. 1. Drain gasoline. 2. Separate blower housing from frame (see Figure 3. Block frame front and back so it will not tip. 4. Remove belt cover. 5.

  • Page 26: Transmission, Transmission Removal, Transmission Installation

    The transmission has no dealer-serviceable parts. If defective, it must be replaced as a unit. 8.1 TRANSMISSION REMOVAL Figure 23 1. Shut off engine, remove key, disconnect spark plug wire, and allow unit to cool completely. CAUTION: Remove fuel from fuel tank before placing unit in service position.

  • Page 27: Auger/impeller, Auger/impeller Repair, Shear Bolts

    7. Assemble, using reverse procedure. SECTION 9 - AUGER/IMPELLER Figure 24 9.2 SHEAR BOLTS IMPORTANT: Use only Ariens shear bolts for replacement. Use of any other type of shear bolt may result in severe damage to unit. Occasionally an object may enter auger/impeller housing and jam auger, breaking shear bolts which secures auger to shaft.

  • Page 28: Discharge Chute

    9.3 DISCHARGE CHUTE Models 939001 and 939002. Figure 25 WARNING: DO NOT put hands or feet near or under rotating parts. Keep clear of discharge opening at all times. WARNING: NEVER direct discharge of material toward bystanders nor allow anyone in front of equipment while unit is in operation.

  • Page 29: Discharge Chute Crank

    9.4 DISCHARGE CHUTE CRANK Model 939300 only or if kit 73900100, Crank Kit, is installed. Figure 26 WARNING: DO NOT put hands or feet near or under rotating parts. Keep clear of discharge opening at all times. WARNING: NEVER direct discharge of material toward bystanders nor allow anyone in front of equipment while unit is in operation.

  • Page 30: Runner And Scraper

    9.5 RUNNER AND SCRAPER CAUTION: Adjust auger/impeller housing height to clear gravel or crushed rock surfaces. Runners should be adjusted as conditions require (Figure 27). Raising or lowering runners controls distance scraper blade is held above surface being cleared. When operating machine on gravel surface, lower runners so the housing will not pick up gravel.

  • Page 31: Aluminum Gear Case

    10.1 ALUMINUM GEAR CASE PS0381 1. Bolt w/Lock Washer 2. Pulley 3. Bearing Flange 4. Ball Bearing 5. Bearing Flange 6. Impeller (12 in.) 7. Groove Pin 8. Oil Seal 9. Flange Bushing 10. Thrust Collar 1. Remove auger/impeller and gear case from housing (see Auger/Impeller Repair on page 27).

  • Page 32

    11.Reassemble gear case. After assembly is complete you should be able to turn input shaft freely. 12.Fill gear case with lubricating oil (Ariens L-2, P/N 00008000): a. Remove filler plug. b. Fill gear case with oil. c. With machine sitting level, check oil level.

  • Page 33

    Ariens Company 655 West Ryan Street P.O. Box 157 Brillion, WI 54110-0157 920-756-2141 Fax 920-756-2407 www.ariens.com 1 - 33...

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