As mentioned in our previous video, Vari-Cool Fan Drive systems require inspection and service every 500 hours or annually, whichever comes first.
If during this inspection you determined that your Vari-Cool Fan Drive belt is worn to or below minimum limits it must be replaced. This video we will discuss Vari-Cool fan belt replacement procedure.
Vari-Cool fan drive belts can easily be replaced with a few simple steps.
Begin by locating the control valve for driver unit. Follow hydraulic lines back to valve to locate. Earlier versions of this valve have one solenoid valve equipped with two coils. This version will have a bypass valve that needs to be cracked open approximately ¼ to a ½ turn.
Control valves on later models have two separate solenoid valves. These versions do not have bypass valve. Their design allows oil to flow out of drive unit without having to open a bypass valve.
Remove vent located on Driver unit.
Locate and remove provided tool, from its storage location.
Install this cap screw into vent opening, threading it into piston plate.
Tighten cap screw to pull inner sheave away from belt releasing tension on belt.
Remove nuts from fan blade cap screws.
Remove fan blade and move forward, next to radiator for storage. Use caution not to damage radiator fins.
Remove 6 cap screws from front Driver pulley,
and remove pulley outer sheave.
Now your belt can be easily remove from Driven unit.
Reverse procedure to install new belt.
Re-install Driver unit, outer sheave
and finger tighten 6 cap screws.
As you tighten these cap screws, rotate belt to avoid pinching between sheave halves and causing damage to belt.
Torque cap screws to specifications found in operator’s manual.
Install fan blade and torque nuts to specifications found in operator’s manual.
If opened, close bleed valve.
Remove cap screw holding inner sheave
and re-install back in its original storage location.
Failure to close bleed valve or remove this cap screw will allow fan belt to slip and may overheat engine.
Re-install vent.
Be sure all fasteners are installed in air diverter and finger guards before starting engine.
Two additional videos are available to assist you if needed with your pre-season inspection and maintenance of Vari-Cool Fan Drives.
Use the link below or Search for; • Vari-Cool Fan Drive inspection • or Vari-Cool Fan Drive maintenance