Horton HT650 Operating instructions

HT650TM Fan Drive
Service Instructions
When unpacking your product, remove all components and inspect them to
ensure that no damage occurred during shipping. If any components are missing
or damaged, contact Horton, Inc. at 1-800-621-1320 immediately. Do not return
the product to the retailer or point of purchase.

INTRODUCTION 2
PRE-INSTALLATION 3
PREVENTIVE MAINTENANCE 3
Vehicle Preparation 3
Every 25,000 Miles 4
FAN DRIVE REMOVAL 4
REPAIR KIT INSTALLATION 5
INSTALLATION 8
TROUBLESHOOTING 10
PARTS LIST 12
INTRODUCTION
This manual describes the correct Inspection, Service, and Repair
procedures for Horton HT650TM Fan Drives. Following the instructions
carefully will provide the safest and most trouble-free operation.
Horton uses the following special notices to give warning of possible
safety related problems which could cause serious injury and provide
information to help prevent damage to equipment.
DANGER indicates an imminently hazardous situation which, if
not avoided, will result in death or serious injury.
WARNING indicates a potentially hazardous situation which, if
not avoided, could result in death or serious injury.
CAUTION indicates a potentially hazardous situation which, if
not avoided, may result in minor or moderate injury.
CAUTION used without the safety alert symbol indicates a
potentially hazardous situation, which, if not avoided, may result
in property damage.
NOTE
NOTE is used to notify people of installation, operation, or
maintenance information which is important but not hazard
related.
CAUTION
WARNING
DANGER
CAUTION
CONTENTS
2

You must follow your company safety practices, which should adhere
to or be better than Federal or State approved shop safety practices
and procedures. Be sure that you understand all the procedures and
instructions before you begin work on this unit.
NOTE
Parts replacement and/or repair of your Horton DIESLTEMP®
Fan Drive should be performed only by the Horton Factory or an
authorized Horton Distributor or Dealer to keep your warranty
coverage intact during the warranty period.
PRE-INSTALLATION
PREVENTIVE MAINTENANCE
Vehicle Preparation
Before performing tests on the Fan Drive, be sure to follow good shop
safety practices and:
• Applythevehicle’sparkingbrake.
• Blockthevehicle’swheels.
Before doing work in the area of the fan:
• Start the vehicle’s engine and build air pressure in excess of
90 psi [6.2 bar].
• ObservethefanandFanDrivefromadistance,lookforvibration,
fan blade contact, Fan Drive slippage, and Fan Drive operation.
• Turnengineoff.
Be sure engine is turned off and fan has stopped turning before
approaching fan area, to prevent serious personal injury.
WARNING
3

Every 25,000 Miles
Fan and Fan Belt
1. Check the fan for looseness and damage, such as bent, cracked or
missing blades, loose rivets or missing weights. Retighten if loose.
Replace if damaged.
2. Check for adequate clearance between the fan and the fan shroud
or other engine compartment components. Repair if the clearance
is inadequate.
3. Check the fan belt condition, belt tension, and belt alignment.
Correct if necessary.
Friction Facing
1. Checkforwearcondition.Replacewhenwornto1/16’’[0.159cm]
thick, oil spotted, or if burn marks are visible.
FAN DRIVE REMOVAL
1. VerifytheFanDrivemodelandthatcorrectreplacementpartst
this model.
AvoiddamagingtheRotaryAirUnionduringfaninstallation,removal,
or when servicing the Fan Drive.
2. DisconnecttheairlinefromtheRotaryAirUnion.
Steps 2-4
Fan
Fan
Drive
NOTE
Protect the radiator from
possible damage from the
fan during fan and Fan Drive
removal.
3. Remove the fan and Fan
Drive from the engine.
4. Remove the fan from the Fan
Drive.
CAUTION
4

Step 1
Socket Head
Cap Screws
Shoulder Screws
Seal
Washer
Steps 2-3
Shoulder Screws
Air Chamber
and
Piston
Drive
Sleeve
Silicone
Sleeve
Compression
Spring
REPAIR KIT INSTALLATION
1. Remove the six Socket Head Cap Screws; then,
remove and discard the two Shoulder Screws.
2. Separate theAir Chamber and Piston from the Drive Sleeve.
3. Remove and discard the two old Silicone Sleeves, Compression
Springs, and Seal Washers.
4. SeparatetheAirChamberfromtheoldPistonanddiscardtheold
PistonandO-ringSeal.
5. ExaminetheinsideoftheAirChamberforsignsofdirtandforeign
material.TheAirChambershouldberelativelycleananddry.If
not,aproblemmayexistinthevehicleairsystemandmustbe
corrected before the Fan Drive is reinstalled.
6. Usingpartscleaningsolvent,cleantheo-ringcontactsurfacesof
theAirChamberandnewPiston.
5

7. LubricatethenewO-ringSealandO-ringsealcontactsurfaces
oftheAirChamberwiththeo-ringlubricantsuppliedintheRepair
Kit;then,installthenewO-ringSealintotheAirChamber.
8. PressthenewPistonintotheAirChamber.
NOTE
If you are installing a new Drive Sleeve, continue with Step 9. If
you are not installing a new Drive Sleeve go to Step 15.
Steps 4-8
Air
Chamber
O-ring
Seal
Piston
9. RemovetheHex.HeadCapScrewandWasher;then,slidethe
Mounting Bracket and Hex. Bracket off the splined hub of the
Friction Disc.
10. Slide the Friction Disc out of the Drive Sleeve.
11. Slide the Friction Disc into the new Drive Sleeve.
12. Slidethe MountingBracket andHex. Bracketonto thesplined
hub of the Friction Disc. Install the new Washer.
Steps 9-12
Hex. Head
Cap Screw
Washer
Mounting Bracket
and
Hex. Bracket
Drive
Sleeve
Friction
Disc
6

13. Install the two new Silicone Sleeves over the new Compression
Springs and onto the Drive Sleeve.
14. Place the two new Seal Washers on top of the new Compression
Springs.
15. AligntheAirChamberandnewPistonwiththetabsoftheDrive
Sleeve.
16. ApplyadropofLoctite®242 to the threads of the two new Shoulder
ScrewsandsecuretheAirChamberandnewPistontotheDrive
Sleeve.
17. AlternatelyandevenlytightenthetwonewShoulderScrewsto
20-25Ft.Lbs.[27.1-33.9N•m]torque.
18. ApplyadropofLoctite®242halfwaydownthethreadsofthesix
SocketHeadCapScrewsandinstallthesixSocketHeadCap
Screws.
19. AlternatelyandevenlytightenthesixSocketHeadCapscrews
to20-25Ft.Lbs.[27.1-33.9N•m]torque.
NOTE
If you are replacing the Rotary Air Union, continue with Step 20.
Steps 13-14
Air Chamber
and
Piston
Drive
Sleeve
Silicone
Sleeve
Seal
Washer
Compression
Spring
Steps 15-19
Socket
Head
Cap
Screws
Shoulder
Screws
Shoulder
Screws
7

20. Remove the three Pan Head Screws and the old Retaining
Washer;then,removetheoldRotaryAirUnionandoldO-ring
Seal.
21. LubricatethenewO-ringSealwiththeo-ringlubricantsupplied
inthe Repair Kit;then, install the newO-ring Seal into theAir
Chamber.
22. PressthenewRotaryAirUnionintotheAirChamberandnew
O-ringSeal.
23. SlidethenewRetainingWasheroverthenewRotaryAirUnion.
24. Install and tighten the three Pan Head Screws to 13-17 In. Lbs.
[1.5-1.9N•m]torque.
Pan
Head
Screw
Rotary Air
Union
O-ring
Seal
Retaining
Washer
Air
Chamber
INSTALLATION
Avoid damaging the Rotary Air Union during fan installation,
removal, or when servicing the Fan Drive.
1. Usingsuppliednutsandlockwashers,mountthefanontotheFan
Drive;then,tightenthenutsto10Ft.Lbs.[13.6N•m]torque.
2. UsingSAEgrade8bolts,installthefanandFanDriveassembly
onto the fan drive pulley. Tighten the mounting bolts to 25 Ft. Lbs.
[33.9N•m]torque.
CAUTION
Steps 20-24
8

Steps 1-2
Fan
Drive
Fan
Supplied nuts and lockwashers
Step 5
3. Make the air line connections between the Solenoid Valve and
the Fan Drive.
4. Check for proper air pressure to the Fan Drive. This measurement
should always be taken at the Fan Drive air inlet port.
NOTE
To assure maximum horsepower carrying capacity of the Fan
Drive and to prevent damage to the Fan Drive, there must be a
minimum pressure of 90 to 120 psi [6.2 to 8.3 bar] to the Fan Drive
upon engagement.
5. AfxtheWARNINGstickertoahighlyvisibleareaoftheengine
compartment.
9

TROUBLESHOOTING
PROBLEM PROBABLE CAUSE SOLUTION
Fan Drive
fails to
engage
Electrical Problem
1. Broken circuit (Normally
OpenSystem).
2. Improperly wired.
3. Thermal Switch incorrect for
application.
4. Bad Solenoid Valve.
1. Check electrical
connections.
2. Check wiring according
to diagram.
3. Check Thermal Switch
(N.O.orN.C.).
4. Replace the Solenoid
Valve.
Air Problem
1. AirleaksinFanDrive.
2. Restricted air supply to the
Fan Drive.
3. Bad Solenoid Valve.
1. Install new O-ring
Seals.
2. Check the Rotary Air
Unionandairlinesfor
leaks or restrictions.
3. Replace the Solenoid
Valve.
Fan Drive
fails to
disengage
Electrical Problem
1. Broken circuit (Normally Closed
System).
2. Improperly wired.
3. Bad Thermal Switch.
1. Check electrical
connections.
2. Check wiring
according to
diagram.
3. Replace Thermal
Switch.
Air Problem
1. Airlinerestricted,notallowing
air to exhaust from Fan
Drive.
2. Bad Solenoid Valve.
1. C h e c k t h e a i r l i n e
between the Fan Drive
and Solenoid Valve
for restrictions or
obstructions.
2. Replace the Solenoid
Valve.
Fan Drive
engaged,
engine
running
hot
1. Check for shutter
operation, winter
fronts, or obstructions
in front of radiator.
2. Refer to vehicle engine
manual.
1. Restriction in front of radiator.
2. Cooling system mal-function.
10