Fan adjustment on a D6C D333C, need help

Fans are sometimes reversible, but not really adjustable. In other words, there are two fixed positions, one for fan to suck and one for it to blow.

the reversible fans i was around you had to push the blade down toward the hub and turn aprox 1/4 turn and then the spring would pop it back out. if it hasn't been adjusted in a long time it may require a lot of loose juice.

Hi Team,
these fans were offered somewhere around the mid 1960's and were fitted to most 769 A Trucks as well as attachment for other machines.
Over time the key plates on the ends of the blades and their slots in the fan hubs wore and so this had the effect of flattening out/reducing the pitch of the blades.
When this happens the machines tend to overheat due to diminished air flow.

As said above you push the blades towards the hub centre and turn them to reverse the pitch and create a blower fan or a sucker fan depending on what it was previously set to.

Less wear in the reversed position often restored some of the air flow in the reversed position and so proved the wear problem existed.
On the 769's I think the idea was to periodically reverse the blades to Blow crud out of the radiator fins.
Best fix I feel is to purchase and fit a replacement fan spider of the air direction you require be it blower or suction.

Not sure from memory if they can be dismantled and reclaimed in the keeper and slot areas by welding--might be dodgy for rotating components as such--safer to go standard replacement spider.

I recall having to oxy cut holes, to Cat Drawings, in the side of the crawler tractor radiator cones to get the turning tool in to reverse the blades on New Equipment machines or used machines so fitted/retro-fitted with these.


Some previous dialogue on these jiggers

http://www.acmoc.org/bb/showthread.php?26995-D7e-48a-5960-reversible-fan&highlight=revesable+fan

Cheers,
Eddie B.

Hi Dutchboy, I hope you & yours are okay after last nights twister in Dallas. If you reverse the fan all of that heat and dust will come back on the operator making it impossible to operate! The reverse feature was used to blow warm air on the operator in no/low dust winter conditions. You will be better off spending the money to fix the problem instead of trying a "work around" that's not going to work anyway.
Craig

[quote="seiscat"]Hi Dutchboy, I hope you & yours are okay after last nights twister in Dallas. If you reverse the fan all of that heat and dust will come back on the operator making it impossible to operate! The reverse feature was used to blow warm air on the operator in no/low dust winter conditions. You will be better off spending the money to fix the problem instead of trying a "work around" that's not going to work anyway.
Craig[/quote]
Thank the Lord we are safe, been lots of tornados lately.
So, what would the fix be? The blades hit the cage and are just turned flat. Should I just turn them to blow forward or are you saying to buy something?