Hello, first of all I'm new to the group so I hope I can do this right and would like to thank the host of this forum for the vast amount of knowledge your providing. Has anyone had experience with converting the right angle fan drive system in a 853 to a dual high cfm electric fan system. I feel the right angle drive system was a great idea.. but extremely high in maintenance requirements and personally don't care for the fan belt system used to drive this. There has to be a better way!
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There was a member that a few years ago converted i think a 643 or 743 to thermo fans as his blower housing was toasted. I think he had issues with not being able to get rid of all the heat though, it still got hot.
If you sized the fans and created a housing for the fans, i can't see why you can't move enough air through to get the job done.
I'd weigh up the cost though, the blower drive isn't that expensive if it was to fail.
If you sized the fans and created a housing for the fans, i can't see why you can't move enough air through to get the job done.
I'd weigh up the cost though, the blower drive isn't that expensive if it was to fail.
Hello Tazza, Thank you for that info. The 853 is a bit larger machine.. and yes heat removal both from hydraulics and water heat exchangers could be a problem. I have seen some Case or similar machines with a pair of what looked like 12" fans sitting up on top of heat exchanger system almost like the ones from a electric fan system on some import cars. I am considering the idea in the near future simply to reduce the clutter and also make the machines various internals more accessible. I am currently going through an entire machine rebuild at the moment and hope to address this issue pretty soon. I have a really expensive rework but nice looking Isusu 4JB1 ready for install just waiting on completion of the frame details and repairs.
SkidRoe
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There are a few things that you need to consider in this conversion. The most important one is that compared to an automotive cooling / fan system, you have no ram air effect pushing air through the heat exchangers when the vehicle is in motion. With automotive systems, a large part of your air flow is generated this way. So you will need to use the bigest fans that you can fit. You will also need to ensure that the shroud/plenum that you mount these fans on covers the entire area of the heat exchanger so that you are drawing air across the entire surface. Also, you should make your shroud/plenum is as deep as possible (maximise the distance between the surface of the heat exchanger and the fan) so that you have some settling volume to balance the flow of air being drawn over the entire surface of the cooler. Finally, avoid the use of pusher fans at all cost. Balancing the air flow is extremely difficult unless you use a very large (deep) shoud/plenum.
HTH
How is the fan gear box high maintance? Check the fluid when changing the engine oil and as long as the seal isn't leaking bad, there is nothing that ever has to be done with the gear box. The fan belt tensioners due wear over time, but they still easily last 2000 plus hours. I think you are looking to solve a problem you don't have.
Hello Dan, After tearing down my fan gear box I have found my basic problem, most of it being neglect or maintenance deficiencies from the previous owner. The angle gear keyway has slightly worn and this has created a sloppy backlash problem with the fan in respect to the belt pulley. Since I have partially disassembled the drive and determined that the seals indeed do leak, I have taken the task of rebuilding the entire unit and going for broke to keep the original design. I wasn't too keen on the idea of reinventing the wheel in the first place! The only problem I have run into as of today is removing the blower fan itself, the service manual depicts a unit which has either threaded puller holes for a two or three jawed puller to exert force for fan removal. Apparently I have a earlier model 853 and the puller holes cease to exist on mine. Any ideas on how to remove this style of fan without breaking it, looks similar to carbon fiber or some sort of composite material. Thanks, JL
I noticed the same on a 751 i worked on a few years back, the fan was burnt, so damage wasn't an issue.
I wonder how you would go with drilling and tapping two holes to attach a puller and shock it off. I really don't see any other way to do it. I think it's made of ABS plastic, it's hard and has what appears to be fibres in it to hold it together, naturally it's a little brittle too. I didn't think the blower fan was that spendy from the dealer either, but hopefully it will come off without damage.
Hello Tazza, I am thinking I can machine some holes as well. I do see some areas about 2.5 - 3 inches from center they look as if they were intended for this purpose. Not sure yet but will advise on my luck with thatproceedure. Thanks for your input.
