1. Turn the vehicle ignition off.
   
   
2. Apply the vehicle's parking brake.
   
   
3. Block the vehicle's wheels.
   
   
4. Prepare the area by cleaning all the mounting surfaces of dirt and debris.
   
   
5. Position the DriveMaster into place, aligning the mounting bracket holes with mounting holes on engine.
   
   
6. Reinstall the mounting bolts and tighten to the vehicle manufacturer's specifications.
   
   
7. Replace and adjust the belts.
   
   
8. Check the condition of the fan. Look for cracks or missing weights.
   
   
9. Remount the fan on the fan drive and tighten the nuts to the vehicle manufacturer's specifications.
   
   
10. Reconnect the air supply line to the DriveMaster.
    
    
11. Start the engine and let the air pressure build to at least 90 PSI [6.21 bar].
    
    
12. If the vehicle is fitted with a manual override switch, engage and disengage the fan drive to observe for proper operation as well as air leaks.
    
    
13. Turn off the engine.
    

Learning Objectives:
• Describe the steps of safely reinstalling the fan drive.

• Describe requirements for proper belt tensioning.

• Describe methods to check for proper fan drive operation.

WARNING
On the workbench, apply 90 PSI [6.21 bar] clean air pressure and check the fan drive for air leaks.

NOTE:
Protect the radiator from possible damage from the fan during fan removal and fan drive installation.

NOTE:
Most engines have multiple mounting locations. Be sure to use the correct holes for the application.

NOTE:
Use flat washers on each manufacturer's approved bolt or studs - DO NOT use lock washers.

CAUTION
Correct belt adjustment and alignment is necessary for all belt driven components to assure longevity of component life. Over tightening of belts will shorten bearing life. Loose belts will cause excessive belt wear and shorten bearing life. Consult the equipment manufacturer and/or engine manufacturer specifications for proper belt adjustment.

WARNING
The maximum fan diameter is 32''. If a larger fan diameter is required, contact Horton at 1-800-621-1320.

NOTE:
Remove all tools from the work area and visually inspect the area in which you have been working prior to starting the engine.

NOTE:
For a normally-open electrical system, use a jumper across a sensor. For a normally-closed electrical system, open the circuit by disconnecting a sensor wire.