HORTON DIESLTEMP FAN CLUTCH HT650 SERVICING …

1 INTRODUCTION2 PRE-INSTALLATION3 PREVENTIVE MAINTENANCE3 Vehicle Preparation3 Every 25,000 Miles4 FAN CLUTCH REMOVAL5 REPAIR KIT INSTALLATION5 INSTALLATION8 TROUBLESHOOTING9 PARTS LIST11 HORTON DIESLTEMP FAN CLUTCHHT650 TMSERVICING INSTRUCTIONS INTRODUCTIONRead this manual carefully, making useof its explanations. This manualdescribes the correct Inspection, Service,and Repair procedures for HortonHT650TM Fan Clutches. Following theinstructions carefully will provide thesafest and most trouble-free uses the following specialnotices to give warning of possiblesafety-related problems which couldcause serious injury, and providesinformation to help prevent damage is used to indicate thepresence of a hazard which will causesevere personal injury, death, orsubstantial property damage if thewarning is that a potential hazardexists and indicates procedures thatmust be followed exactly to eithereliminate or reduce the hazard, andto avoid serious personal injury.

2 Orprevent future safety problems withthe is used to indicate thepresence of a hazard which will orcan cause minor personal injury orproperty damage if the warning of operation, procedure, orinstruction that is inserted forcorrect service providing greaterowner satisfaction. A note can alsoprovide information that will makeservice quicker and must follow your company safetypractices, which should adhere to or bebetter than Federal or State approvedshop safety practices and sure that you understand all theprocedures and instructions before youbegin work on this replacement and/or repair ofyour HORTON DIESLTEMP Fan Clutchshould be performed only by theHorton Factory or an authorizedHorton Distributor or Dealer to keepyour warranty coverage intactduring the warranty period.

3 PRE-INSTALLATION3 PREVENTIVE MAINTENANCEV ehicle PreparationBefore performing tests on the FanClutch, be sure to follow good shopsafety practices and: Apply the vehicle s parking brake. Block the vehicle s doing work in the area of the fan: Start the vehicle s engine and buildair pressure in excess of 90 PSI. Observe the fan and Fan CLUTCH froma distance, look for vibration, fanblade contact, Fan CLUTCH slippage,and Fan CLUTCH operation. Turn engine sure engine is turned off and fanhas stopped turning beforeapproaching fan area, to preventserious personal 25,000 MilesFan and Fan Belt1. Check the fan for looseness anddamage, such as bent, cracked ormissing blades, loose rivets ormissing weights. Retorque if if Check for adequate clearancebetween the fan and the fanshroud or other enginecompartment components.

4 Repairif the clearance is Check the fan belt condition, belttension, and belt if Facing1. Check for wear condition. Replacewhen worn to 1/16 thick, oilspotted, or if burn marks are FAN CLUTCH REMOVAL1. Verify the Fan CLUTCH model andthat correct replacement parts fitthis damaging the Rotary AirUnion during fan installation,removal, or when SERVICING the Disconnect the air line from theRotary Air the radiator from possibledamage from the fan during fan andFan CLUTCH Remove the fan and Fan Clutchfrom the Remove the fan from the 2-45 REPAIR KIT INSTALLATION1. Remove the six Socket Head CapScrews; then, remove and discardthe two Shoulder Separate the Air Chamber andPiston from the Drive Remove and discard the two oldSilicone Sleeves, CompressionSprings, and Seal 2-3 Step 1 FanFanClutchSocket HeadCap ScrewsShoulderScrewsShoulderScrewsAir ChamberandPistonDriveSleeveSiliconeSleev eCompressionSpringSealWasherSteps 4-8 Steps 9-1264.

5 Separate the Air Chamber from theold Piston and discard the old Pistonand O-ring Examine the inside of the AirChamber for signs of dirt andforeign material. The Air Chambershould be relatively clean and not, a problem may exist in thevehicle air system and must becorrected before the Fan CLUTCH Using parts cleaning solvent, cleanthe o-ring contact surfaces of theAir Chamber and new Lubricate the new O-ring Seal andO-ring seal contact surfaces of theAir Chamber with the o-ringlubricant supplied in the Repair Kit;then, install the new O-ring Sealinto the Air Press the new Piston into the you are installing a new DriveSleeve, continue with Step 9. If youare not installing a new Drive Sleevego to Step Remove the Hex.

6 Head Cap Screwand Washer; then, slide theMounting Bracket and Hex. Bracketoff the splined hub of the Slide the Friction Disc out of theDrive Slide the Friction Disc into the newDrive Slide the Mounting Bracket andHex. Bracket onto the splined hubof the Friction HeadCap ScrewWasherMounting BracketandHex. BracketDriveSleeveFrictionDisc13. Install the two new Silicone Sleevesover the new Compression Springsand onto the Drive Place the two new Seal Washers ontop of the new Align the Air Chamber and newPiston with the tabs of the Apply a drop of Loctite 242 to thethreads of the two new ShoulderScrews and secure the Air Chamberand new Piston to the Drive Alternately and evenly torque thetwo new Shoulder Screws to20-25 Ft.

7 Lbs. [ N m].18. Apply a drop of Loctite 242 halfway down the threads of the sixSocket Head Cap Screws and installthe six Socket Head Cap Alternately and evenly torque thesix Socket Head Cap screws to 20-25 Ft. Lbs. [ N m].Steps 15-19 Steps 13-14 Steps 20-24 NOTEIf you are replacing the Rotary AirUnion, continue with Step Remove the three Pan Head Screwsand the old Retaining Washer;then, remove the old Rotary AirUnion and old O-ring Lubricate the new O-ring Seal withthe o-ring lubricant supplied in theRepair Kit; then, install the newO-ring Seal into the Air Press the new Rotary Air Union intothe Air Chamber and new ChamberandPistonDriveSleeveSiliconeSleev eSealWasherCompressionSpringSocket HeadCap ScrewsShoulderScrewsShoulderScrewsPan HeadScrewRotary AirUnionO-ringSealRetainingWasherAirCham ber723.

8 Slide the new Retaining Washerover the new Rotary Air Install and torque the three PanHead Screws to 13-17 In. Lbs.[ N m]. Steps 1-2 FanClutchFanSuppliednuts and lockwashers8 INSTALLATIONA void damaging the Rotary AirUnion during fan installation,removal, or when SERVICING the Using supplied nuts andlockwashers, mount the fan ontothe Fan CLUTCH ; then, torque thenuts to 10 Ft. Lbs. [ N m].2. Using SAE grade 8 bolts, install thefan and Fan CLUTCH assembly ontothe fan drive pulley. Torque themounting bolts to 25 Ft. Lbs.[ N m].3. Make the air line connectionsbetween the Solenoid Valve andthe Fan Check for proper air pressure to theFan CLUTCH . This measurementshould always be taken at the FanClutch air inlet assure maximum horsepowercarrying capacity of the Fan Clutchand to prevent damage to the FanClutch, there must be a minimumpressure of 90 to 120 PSI to the FanClutch upon Affix the WARNING sticker to ahighly visible area of the Step 59 TROUBLESHOOTINGPROBLEMPROBABLE CAUSESOLUTION Fan CLUTCH fails to engage Electrical Problem1.

9 Broken circuit (NormallyOpen System).2. Improperly Check Check wiring according Check Thermal Switch( or ).4. Replace the SolenoidValve. Air Problem1. Air leaks in Fan Install new O-ring Check the Rotary Air Unionand air lines for leaks Replace the SolenoidValve. Fan CLUTCH fails to disengage Electrical Problem1. Broken circuit (NormallyClosed System).1. Check Check wiring according Replace Thermal Switch. Air Problem1. Air line restricted, notallowing air to exhaustfrom Fan Check the air line betweenthe Fan CLUTCH andSolenoid Valve forrestrictions or Replace the Thermal Switch incorrectfor Bad Solenoid Restricted air supply to theFan Bad Solenoid Improperly Bad Thermal Bad Solenoid Valve.

10 Fan CLUTCH engaged, engine running hot1. Check for shutter oper-ation, winter fronts, orobstructions in front Refer to vehicle Restriction in front Cooling system continued onPage CAUSESOLUTION Fan CLUTCH cycles frequently Electrical Problem1. Poor ground wire Improper temperaturecontrol Check Check temperature settingof all controls. ThermalSwitch setting shouldengage the Fan Clutch100 F higher than the fullopen temperature of Check the A/C PressureSwitch. Use higher Check for shutteroperation, winter fronts, orobstructions in front of Replace the Replace the A/C Pressure Switch settingtoo Restriction in front of radiator, blocking air Faulty Thermal Faulty Air-Temp Switch.