Ariens Professional Sno-Thro Series Service Manual
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Ariens Professional Sno-Thro Series Service Manual

With hydrostatic drive
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Service Guide
®
Professional Series Sno-Thro
With Hydrostatic Drive
Models
926060 – Pro 28 RapidTrak
(SN 000101 +)
926068 – Pro 28 EFI
(SN 000101 +)
926069 – Pro 32 RapidTrak
(SN 000101 +)
926070 – Pro 36 EFI
(SN 000101 +)
926334 – Pro 32 12V CE
(SN 000101 +)
926336 – Pro 28 EFI CE
(SN 000101 +)
926337 – Pro 28 EFI CE Track
(SN 000101 +)
926338 – Pro 28 EFI CE RapidTrak
(SN 000101 +)
E10
ENGLISH
05136630B • 12/18

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Summary of Contents for Ariens Professional Sno-Thro Series

  • Page 1 Service Guide ® Professional Series Sno-Thro With Hydrostatic Drive Models 926060 – Pro 28 RapidTrak (SN 000101 +) 926068 – Pro 28 EFI (SN 000101 +) 926069 – Pro 32 RapidTrak (SN 000101 +) 926070 – Pro 36 EFI (SN 000101 +) 926334 –...

  • Page 2: Table Of Contents

    TABLE OF CONTENTS Remove Interlock Cam ........38 SAFETY .
  • Page 3 A parts manual and an operator’s manual for your unit are available for free download or purchase at www.ariens.com. AriensCo recommends using only genuine Ariens replacement parts on this unit. Using unauthorized parts may adversely affect the performance, durability or safety of this unit and may void the warranty.

  • Page 4: Safety

    Failure to follow these instructions and warnings may cause death or serious 4. Notice injury. If you have purchased this product from an Ariens NOTICE: Indicates information or procedures that are dealer, the dealer can provide you with training.

  • Page 5: Safety Decals

    SAFETY DECALS Stop engine, remove key, and read manual The safety decals on your machine are visual reminders of before making any repairs or adjustments. the important safety information in this manual. All messages on your unit must be fully understood and carefully followed.

  • Page 6: Safety Rules

    SAFETY RULES Handle fuel with care; it is highly flammable. • Use an approved fuel container. The following safety instructions are based on the B71.3 specifications of the American National Standards Institute • Never add fuel to a running engine or hot engine. in effect at the time of production.
  • Page 7 After striking a foreign object, stop the engine, remove the Never operate the snow thrower without good visibility or wire from the spark plug, disconnect the cord on electric light. Always be sure of your footing, and keep a firm hold motors, thoroughly inspect the snow thrower for any on the handles.
  • Page 8 Maintain or replace safety and instruction labels as When practical, remove gas-powered equipment from the necessary. truck or trailer and refuel it on the ground. If this is not possible, then refuel on a trailer with a portable container, Run the machine a few minutes after throwing snow to rather than from a gasoline dispenser nozzle.

  • Page 9: Draining Fuel System

    DRAINING FUEL SYSTEM SEPARATE HOUSING FROM FRAME Move unit to an open, well-ventilated area with no Remove Auger Housing flames or sparks. IMPORTANT: Save all hardware for reinstallation. Remove fuel tank cap and siphon fuel into a clean Stop engine, remove key and wait for moving parts to gasoline container.
  • Page 10 IMPORTANT: Discharge chute control designs differ based Generation 3 Chute Control Designs on serial number. Generation 2 chute control designs See Figure 5. appear as shown in Figure 4 and Generation 3 chute 10. Remove hairpin from clevis pin and partially remove control designs appear as shown in Figure 5.
  • Page 11 See Figure 6. 13. Remove hairpin, sleeve bushing and cable eyelet from deflector arm under dash panel. 14. With a pliers, compress cable anchor tabs and remove anchor from deflector bracket. IMPORTANT: Reinstall sleeve bushing and hairpin so parts are not misplaced. Figure 7 See Figure 8.
  • Page 12 18. Remove hardware retaining belt finger to engine and See Figure 11. remove belt finger. See Figure 9. 20. Position support, such as a trash can, under handlebars so tractor / frame remains upright when separated from auger housing. 21. Chock or block wheels to prevent tractor / frame movement.

  • Page 13: Reinstall Auger Housing

    See Figure 12. Reinstall Auger Housing 22. Remove hardware securing auger housing to frame. See Figure 13. 23. Lift auger housing rear slightly to disengage from With help from an adult assistant, engage attachment mount rod and separate from unit. clutch lever so attachment brake will not obstruct attachment drive pulley in step 2.
  • Page 14 To assist belt installation, slowly pull recoil starter handle while gently guiding belts onto attachment sheave. Measure Here Figure 14 Reinstall belt finger and secure with two flat steel 1. Belt Finger washers, two locking washers and two hex bolts. 2.
  • Page 15 24. Remove sleeve bushing and hairpin from deflector Generation 3 Chute Control Design arm and reinstall cable eyelet onto deflector arm. See Figure 16. Reinstall sleeve bushing and hairpin. See Figure 6. 18. Remove hairpin from clevis pin and reinstall cable 25.

  • Page 16: Bottom Cover Removal

    BOTTOM COVER REMOVAL Remove Bottom Cover IMPORTANT: Save all hardware for reinstallation. WARNING: AVOID INJURY. Before placing unit in service position, drain fuel from tank and fuel system. See Draining Fuel System on page 7. Make sure unit is secure and will not tip. Stop engine, remove key and wait for all moving parts to stop and for hot parts to cool.

  • Page 17: Install Bottom Cover

    Remove hardware retaining bottom cover to frame Install Bottom Cover and remove cover. See Figure 21. Reinstall bottom cover and secure with two tapping screws and four hex bolts. Models 926068, 926070, 926334, 926336, 926337: advance to step 6. Models 926060, 926069, 926338 See Figure 22.

  • Page 18: Attachment Drive Belt Replacement

    ATTACHMENT DRIVE BELT TRACTION DRIVE BELT REPLACEMENT REPLACEMENT Remove Attachment Drive Belts Remove Traction Drive Belt IMPORTANT: Save all hardware for reinstallation. IMPORTANT: Save all hardware for reinstallation. Stop engine, remove key and wait for all moving parts Stop engine, remove key and wait for all moving parts to stop and for hot parts to cool.

  • Page 19: Install Traction Drive Belt

    DRIVE IDLER ASSEMBLY REPLACEMENT Remove Attachment Drive Idler Assembly IMPORTANT: Save all hardware for reinstallation. Stop engine, remove key and wait for all moving parts to stop and for hot parts to cool. Disconnect spark plug wire from engine. Remove auger housing. See Separate Housing From Frame on page 7.

  • Page 20: Remove Traction Drive Idler Assembly

    See Figure 29. Remove roll pin, attachment idler arm hub and front torsion spring from drive idler pivot rod. Remove rear torsion spring from around idler pivot rod. Figure 27 Remove Traction Drive Idler Assembly IMPORTANT: Save all hardware for reinstallation. Stop engine, remove key and wait for all moving parts to stop and for hot parts to cool.

  • Page 21: Install Traction Drive Idler Assembly

    Install Traction Drive Idler Assembly Install Attachment Drive Idler Assembly See Figure 31. See Figure 33. Reposition torsion spring leg around idler arm. IMPORTANT: Ensure idler arm has tension. Secure attachment drive idler assembly to hub with original tapping screws. Reinstall second torsion spring and attachment idler arm hub onto pivot rod.

  • Page 22: Attachment Brake Replacement

    Adjust attachment drive clutch. Refer to Operator’s ATTACHMENT BRAKE REPLACEMENT Manual for adjustment procedure. Remove Attachment Brake Reconnect spark plug wire. IMPORTANT: Save all hardware for reinstallation. IMPORTANT: Check all adjustments after first use. Stop engine, remove key and wait for all moving parts to stop and for hot parts to cool.
  • Page 23 Attachment Clutch Disengaged / Brake Engaged WARNING: AVOID INJURY. Before placing unit in service position, drain fuel from tank and fuel system. See Draining Fuel System on page 7. Make sure unit is secure and will not tip. Place unit in service position and remove bottom cover.

  • Page 24: Transaxle Replacement

    Remove hairpin and flat steel washer retaining traction TRANSAXLE REPLACEMENT drive cable end to traction idler arm. Remove cable Remove Transaxle end from arm. See Figure 40. IMPORTANT: Save all hardware for reinstallation. Stop engine, remove key and wait for all moving parts to stop and for hot parts to cool.
  • Page 25 13. Remove hairpin and flat steel washer securing shift rod to transaxle. See Figure 44. Figure 42 12. Remove hardware retaining transaxle shroud and remove shroud. See Figure 43. Figure 44 14. Remove hairpin securing shift rod to bell crank at unit rear and remove shift rod.
  • Page 26 15. Remove hairpin securing transaxle bypass rod to See Figure 48. transaxle and remove bypass rod from transaxle. See 18. Tilt transaxle so tension is removed from chain and Figure 46. remove chain from transaxle. 19. Remove transaxle. Figure 46 16.

  • Page 27: Install Transaxle

    See Figure 51. Install Transaxle Reinstall shift rod into transaxle and bell crank. Install key, pinion sprocket and spacer bushing onto transaxle driveshaft. Secure with E-ring. IMPORTANT: Shift rod ends are not equal length. The long end inserts through transaxle, and the short end inserts See Figure 50.
  • Page 28 Reinstall transaxle bypass rod through unit rear and See Figure 53. into bypass arm on transaxle. Secure with hairpin. See Align transaxle with transaxle mount. Figure 52. Reinstall two hex bolts through transaxle mount and transaxle. Secure with two flat steel washers, two locking washers and two hex nuts, but DO NOT tighten hardware.
  • Page 29 1. Stepped Spacer 2. Pocket Bushing 3. Idler Pulley Figure 54 4. Flat Steel Washer 5. Locking Nut Figure 55 See Figure 55. 14. Reinstall stepped spacer onto hex bolt and insert bolt 18. Reinstall housing to frame. See Reinstall Auger through frame front from inside frame.

  • Page 30: Check Chain Tension

    Check Chain Tension TRANSAXLE SERVICE Push on front chain length and observe amount of Add Transaxle Fluid deflection. SAE 0W-40 is approved for all-season applications in • If chain deflects less than 3.2 mm (1/8"), chain is too Hydro-Gear® RT-310™ transaxles. tight and requires adjustment.

  • Page 31: Purge Air From Transaxle

    Purge Air From Transaxle REDUCTION SHAFT BEARING Due to the effects air has on efficiency in hydrostatic drive REPLACEMENT applications, it’s critical that air is purged from the system. Models 926060, 926069, 926338 The purge procedure in this section should be performed Remove Bearings each time a hydrostatic system has been opened for maintenance or after adding oil.

  • Page 32: Install Bearings

    Install Bearings Press bearings into bearing flanges and install onto reduction shaft. Install shaft into transmission bracket and position bearing flanges outside transmission bracket. Secure each bearing flange to transmission bracket with 3 tapping screws. Install sleeve bushing onto right side of pinion shaft. See Figure 61.

  • Page 33: Auger Replacement

    Remove hardware retaining support bushings to auger AUGER REPLACEMENT housing. See Figure 64. Remove Auger IMPORTANT: Save all hardware for reinstallation. Stop engine, remove key and wait for all moving parts to stop and for hot parts to cool. Disconnect spark plug wire from engine. Remove auger housing.

  • Page 34: Install Auger

    Align holes in auger with holes in auger shaft and reinstall shear bolt. Torque bolt to 7.9 N•m – 16.5 N•m (5.8 lb-ft – 12.2 lb-ft). If torque wrench is unavailable, tighten until bolts no longer spin freely. DO NOT overtighten.

  • Page 35: Auger Gearcase Replacement

    See Figure 69. AUGER GEARCASE REPLACEMENT Tighten three hex nuts securing bearing plate to auger Remove Gearcase Assembly housing. IMPORTANT: Save all hardware for reinstallation. 10. Apply anti-seize compound to impeller shaft end. Stop engine, remove key and wait for all moving parts 11.

  • Page 36: Impeller Replacement

    IMPELLER REPLACEMENT Remove Impeller IMPORTANT: Save all hardware for reinstallation. Stop engine, remove key and wait for all moving parts to stop and for hot parts to cool. Disconnect spark plug wire from engine. Remove auger housing. See Separate Housing From Frame on page 7.

  • Page 37: Engine Replacement

    ENGINE REPLACEMENT Remove Engine IMPORTANT: Save all hardware for reinstallation. Stop engine, remove key an d wait for all moving parts to stop and for hot parts to cool. Disconnect spark plug wire from engine. Drain gasoline from fuel system and tank. See Draining Fuel System on page 7.

  • Page 38: Battery Replacement

    BATTERY REPLACEMENT Install Battery Install battery in battery tray so negative terminal is Model 926334 positioned on the right side (from perspective of the Remove Battery operator in operator’s position). IMPORTANT: Save all hardware for reinstallation. Reconnect positive battery cable to positive battery Stop engine, remove key and wait for all moving parts terminal first, then the negative cable to negative to stop and for hot parts to cool.

  • Page 39: Traction Drive Clutch Cable Replacement

    TRACTION DRIVE CLUTCH CABLE REPLACEMENT Remove Traction Drive Clutch Cable IMPORTANT: Save all hardware for reinstallation. Stop engine, remove key and wait for all moving parts to stop and for hot parts to cool. Disconnect spark plug wire from engine. Remove belt cover.

  • Page 40: Install Traction Drive Clutch Cable

    Install Traction Drive Clutch Cable DUAL-HANDLE INTERLOCK Reinstall upper traction clutch cable to traction clutch REPLACEMENT lever and secure with one flat steel washer and Remove Interlock Cam hairpin. See Figure 79. IMPORTANT: Save all hardware for reinstallation. Connect lower traction clutch cable to upper traction clutch cable.

  • Page 41: Install Interlock Cams

    Figure 84 Reinstall right camshaft and secure to clutch lever with one tapping screw. Figure 86 Check dual-handle interlock function. Refer to Operator’s Manual for test procedure. IMPORTANT: If dual-handle interlock continues to malfunction, see your Ariens dealer. EN – 40...

  • Page 42: Axle Bearing Replacement

    AXLE BEARING REPLACEMENT Install Left Axle Bearing Install bearing onto axle and align with bearing plate. Models 926068, 926070, 926336 Insert three hex bolts from inside frame through Remove Left Axle Bearing bearing and secure with three locking nuts. IMPORTANT: Save all hardware for reinstallation. Reinstall sleeve bushing and key onto axle.

  • Page 43: Install Right Axle Bearing

    See Figure 89. Install Right Axle Bearing IMPORTANT: Two flat steel washers will become free Align bearing with bearing plate and mount to frame when short axle is removed. with three hex bolts from inside frame. Secure with three locking nuts. Hold differential gear and remove short axle.

  • Page 44: Pinion Shaft Bushing Replacement

    See Figure 92. PINION SHAFT BUSHING Reinstall long axle into differential gear. REPLACEMENT Reinstall E-ring onto axle end. Remove Bushings IMPORTANT: Save all hardware for reinstallation. WARNING: AVOID INJURY. Before rotating unit forward, drain fuel from tank and fuel system. See Draining Fuel System on page 7.
  • Page 45 Models 926060, 926069, 926338 Model 926337 Remove drive wheels and tracks from unit. See 12. Remove drive wheels and tracks from unit. See Remove Track Drive Wheel on page 60. Remove Track Drive Wheel on page 60. Slowly rotate track carriage assembly as far down as See Figure 96.

  • Page 46: Install Bushings

    Models 926060, 926069, 926338 Models 926068, 926070, 926336 Figure 98 Figure 100 Model 926337 Models 926060, 926069, 926338 Figure 101 Figure 99 Install Bushings Model 926337 Install bushings into pinion gear and / or transaxle mounting bracket. See Figure 100, Figure 101 and Figure 102. Reinstall pinion gear through transaxle mounting bracket.

  • Page 47: Differential Gear Replacement

    See Figure 103. DIFFERENTIAL GEAR REPLACEMENT Position spacer against frame and reinstall spring clip Remove Differential Gear into pinion shaft. IMPORTANT: Save all hardware for reinstallation. Models 926068, 926070, 926334, 926336, 926337: Position flat steel washer against pinion gear and WARNING: AVOID INJURY.

  • Page 48: Install Differential Gear

    See Figure 105. IMPORTANT: Two flat steel washers will become free when short axle is removed. Hold differential gear and remove short axle from unit. IMPORTANT: Make sure two sleeve bushings remain inside short axle ends. 1. Short Axle 2. Flat Steel Washer 3.

  • Page 49: Chute Gear Replacement

    See Figure 109. CHUTE GEAR REPLACEMENT IMPORTANT: Support discharge chute so it remains Remove Chute Rotation Gear upright. IMPORTANT: Save all hardware for reinstallation Remove hardware securing chute rotation gear to Stop engine, remove key and wait for all moving parts pedestal plate and remove chute gear.

  • Page 50: Remove Actuation Gear

    Remove Actuation Gear IMPORTANT: Save all hardware for reinstallation. Stop engine, remove key and wait for all moving parts to stop and for hot parts to cool. Disconnect spark plug wire from engine. Remove chute rotation gear. See Remove Chute Rotation Gear on page 47.

  • Page 51: Scraper Blade Replacement

    See Figure 113. SCRAPER BLADE REPLACEMENT Slowly tip unit back so it rests on handlebars. Remove Scraper Blade Remove remaining hardware securing scraper blade IMPORTANT: Save all hardware for reinstallation. to auger housing and remove scraper blade. WARNING: AVOID INJURY. Before tipping unit onto handlebars, drain fuel from tank and fuel system.

  • Page 52: Headlight Replacement

    HEADLIGHT REPLACEMENT Remove Bulb IMPORTANT: Save all hardware for reinstallation. Stop engine, remove key and wait for all moving parts to stop and for hot parts to cool. Disconnect spark plug wire from engine. Remove hardware securing headlight to dash panel. See Figure 114.

  • Page 53: Efi Battery Replacement

    EFI BATTERY REPLACEMENT Models 926068, 926070, 926336, 926337, 926338 Remove Battery IMPORTANT: Save all hardware for reinstallation. Stop engine, remove key and wait for all moving parts to stop and for hot parts to cool. Disconnect spark plug wire from engine. Disconnect wire harnesses from ECU.

  • Page 54: Replace Engine Control Unit (Ecu)

    See Figure 120. REPLACE ENGINE CONTROL UNIT Secure battery bracket to dash panel with original (ECU) hardware. Models 926068, 926070, 926336, 926337, 926338 Reconnect battery connector to wire harness. Remove ECU IMPORTANT: Save all hardware for reinstallation. Stop engine, remove key and wait for all moving parts to stop and for hot parts to cool.

  • Page 55: Install Ecu

    Install ECU GEARCASE REBUILD Secure ECU to bracket with original hardware. See Disassemble Gearcase Figure 123. IMPORTANT: Save all parts for reassembly, unless Secure ECU bracket to dash panel with original otherwise specified. hardware. See Figure 121. Remove gearcase. See Remove Gearcase Assembly Reconnect wire harnesses to ECU.
  • Page 56 See Figure 125. Remove hardware retaining gearcase cover and remove cover. Remove gasket and drain gearcase. Figure 127 With a flathead screwdriver or similar pry bar, remove Figure 125 front seal cover and discard. See Figure 128. Remove bushing retainer from gearcase. See Figure 126.
  • Page 57 10. With a snap ring pliers, remove retaining ring. See 14. Remove seals and flange bushings from gearcase. Figure 129. See Figure 131. Figure 129 Figure 131 See Figure 130. 11. With a driver, strike impeller shaft end until shaft is through front of gearcase.

  • Page 58: Assemble Gearcase

    See Figure 134. Assemble Gearcase Reinstall impeller shaft through gearcase front and See Figure 132. reinstall thrust collar onto impeller shaft end. Press rear seal into gearcase until flush with gearcase Wrap a seal protector around impeller shaft end and exterior.
  • Page 59 See Figure 135. Reinstall flange bushing onto impeller shaft end. With a driver, strike bushing until positioned just below Reinstall pin into impeller shaft and turn shaft so pin is retaining ring groove. See Figure 136. horizontal. Align thrust collar with pin and install thrust collar over pin.
  • Page 60 See Figure 138. 15. With a driver, such as a 1 1/4" deep-well socket, drive bushing into gearcase until groove is just beyond 12. Reinstall one flat steel washer into left side of interior gearcase wall. See Figure 140. gearcase. 13.
  • Page 61 See Figure 142. (2.4" – 2.6") from the flat surface of the gearcase cover. IMPORTANT: Ariens recommends using only Ariens L3 synthetic sever duty gear lube. Using other lubricants will not automatically void unit warranty, but the warranty will not cover damage caused by using unauthorized lubricants.

  • Page 62: Track Drive Wheel Replacement

    TRACK DRIVE WHEEL REPLACEMENT Models 926060, 926069, 926338 Remove Track Drive Wheel IMPORTANT: Save all hardware for reinstallation. WARNING: AVOID INJURY. Before placing unit in service position, drain fuel from tank and fuel system. See Draining Fuel System on page 7. Make sure unit is secure and will not tip.

  • Page 63: Track Replacement

    TRACK REPLACEMENT Install Track See Figure 150 and Figure 151. Remove Track IMPORTANT: Tracks are directional and MUST be installed IMPORTANT: Save all hardware for reinstallation. in the orientation shown in Figure 150 and Figure 151. Install track onto carriage assembly and align with WARNING: AVOID INJURY.

  • Page 64: Bogie Wheel Replacement

    Model 926337: Adjust track tension. Refer to BOGIE WHEEL REPLACEMENT Operator’s Manual for adjustment procedure. Remove Bogie Wheel Fill fuel tank and reconnect spark plug wire. IMPORTANT: Save all hardware for reinstallation. IMPORTANT: Check all adjustments after first use. WARNING: AVOID INJURY. Before placing unit in service position, drain fuel from tank and fuel system.

  • Page 65: Axle Bearing Replacement (Track Models)

    AXLE BEARING REPLACEMENT Model 926337 (TRACK MODELS) Remove Left Bearing IMPORTANT: Save all hardware for reinstallation. WARNING: AVOID INJURY. Before placing unit in service position, drain fuel from tank and fuel system. See Draining Fuel System on page 7. Make sure unit is secure and will not tip. Stop engine, remove key and wait for all moving parts to stop and for hot parts to cool.

  • Page 66: Install Left Bearing

    Install Left Bearing Models 926060, 926069, 926338 IMPORTANT: Bearing plates are ONLY installed with bearing on frame. Bearing plates are NOT installed with bearing on carriage. Secure each bearing to frame and / or carriage with three hex bolts and three locking nuts. Reinstall sleeve bushing between bearings.

  • Page 67: Remove Right Bearing

    Reinstall track drive wheel and reinstall track. See Remove Right Bearing Install Track Drive Wheel on page 60 and Install Track IMPORTANT: Save all hardware for reinstallation. on page 61. Return unit to operating position. WARNING: AVOID INJURY. Before placing unit in service position, drain fuel from tank and fuel 10.
  • Page 68 Model 926337 Model 926337 Figure 161 Model 926337 See Figure 162. IMPORTANT: Flat nylon washer will become free when short axle is removed. Hold differential gear and remove short axle. IMPORTANT: Make sure sleeve bushings remain inside short axle ends. 1.

  • Page 69: Install Right Bearing

    See Figure 164. Install Right Bearing 11. Loosen, but DO NOT remove hardware retaining axle IMPORTANT: Bearing plates are ONLY installed with mount plates to side plates. bearing on frame. Bearing plates are NOT installed with bearing on carriage. 12. Remove sleeve bushing between frame and carriage side plate bearings.
  • Page 70 See Figure 168 and Figure 169. Reinstall long axle into differential gear. Models 926060, 926069, 926338: Reinstall hub onto each axle end. Model 926337: Reinstall one flat steel washer onto each axle end. Models 926060, 926069, 926338 Figure 168 Model 926337 Figure 169 Reinstall E-ring onto right axle end.

  • Page 71: Efi Troubleshooting

    EFI TROUBLESHOOTING EFI REPLACEMENT COMPONENTS....71 EFI TROUBLE CODE IDENTIFICATION ...73 CHECKING TROUBLE CODES ....73 TROUBLE CODE DIAGNOSTICS.

  • Page 72: Efi Replacement Components

    EFI REPLACEMENT COMPONENTS Models 926068, 926070, 926336, 926337, 926338 See Figure 170, Figure 171 and Figure 172. Ariens recommends using only genuine Ariens replacement parts on this unit. Using unauthorized parts may adversely affect the performance, durability or safety of this unit and may void the warranty. Click the Parts Diagrams by Parts Radar link at www.ariensco.com for...
  • Page 73 Fuel Injector Servo Motor Servo-Operated Engine Throttle Plate Temperature Sensor Fuel Pump With Internal Filter Fuel Inlet Fuel Pressure Sensor (Internal) Figure 173 Inline Fuel Filter Throttle Body Assembly* Sealing O-Ring Fuel Pump Figure 172 *Throttle body assembly consists of fuel injector, fuel pressure sensor and servo-operated throttle plate.

  • Page 74: Efi Trouble Code Identification

    EFI TROUBLE CODE IDENTIFICATION CHECKING TROUBLE CODES The blinking red LED light on the ECU displays trouble Trouble Problem Correction codes. Its sequence indicates a particular system Code malfunction by blinking as many times as the first digit of a Low Battery Voltage Check charging trouble code, pausing, and then blinking as many times as system and battery.

  • Page 75: Trouble Code Diagnostics

    TROUBLE CODE DIAGNOSTICS NOTICE: Before performing diagnostic tasks, be aware of the screw on the bottom of the throttle body that adjusts the servo offset. The servo offset calibrates the throttle body at the factory using a flow bench and should NEVER be touched.

  • Page 76: Code 21: Barometer Sensor

    Code 21: Barometer Sensor Code 23: EFI System Cannot Sustain Desired RPM See Figure 170. The ECU reads the RPM through the alternator. If a faulty This trouble code indicates the barometric pressure sensor connection exists, the ECU will not read the RPM correctly. has failed.
  • Page 77 Inline Fuel Filter Center Tab Figure 180 Check fuel pump wiring to ensure it is connected correctly. See Figure 181. Figure 182 Fuel Pump Wires IMPORTANT: Fuel pump voltage MUST be measured within 30 seconds of the ignition switch being turned to the ON position.

  • Page 78: Code 28: High Battery Voltage

    Remove pump from tank. DIAGNOSTICS FOR NON-TROUBLE Reconnect pump wires. CODES Turn the ignition key to the ON position and listen for a IMPORTANT: The following conditions and diagnostic “humming” noise. procedures apply to EFI components only. If fuel pump is silent, replace fuel pump. Engine Starts and Loses Power If voltage is within range and fuel pump is operating If the engine starts and loses power immediately, this is...
  • Page 79 recoil starter handle to check for spark. If no spark is present, replace spark plug. f. Reinstall spark plug and finger tighten. Turn an additional 1/4 turn after spark plug is seated. g. Reinstall spark plug wire and make sure it is correctly positioned onto the spark plug.
  • Page 80 If voltage is within range and the fuel injector is not operating correctly with the key in the ON position, replace throttle body assembly. Figure 187 c. If no voltage is present at the injector, check battery voltage by probing the red and white wires on the 12-pin ECU connector with the red probe and contact the black probe against the engine block.

  • Page 81: Surging Run Condition

    If no voltage is present at the ECU, replace ECU. If voltage With an inline spark tester, check ignition for is present at the ECU, check wires for kinks or damage. If intermittent spark. damage is present repair wires if possible, or replace Check fuel pump output.

  • Page 82: Fluttering Servo Motor

    c. Position the black probe on the engine block. d. Turn ignition key to ON position. e. Turn the potentiometer from low-idle to full throttle. Voltage to the red wire should measure 4.90 V DC – 5.0 V DC at both low-idle and full throttle positions. If voltage measures less than 4.9 V DC, replace ECU.

  • Page 83: Service Record

    SERVICE RECORD DATE SERVICE COMPLETED NOTES EN – 82...
  • Page 84 655 West Ryan Street Brillion, WI 54110 www.ariensco.com parts.ariens.com...

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