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Old 09-17-2013, 10:37 AM   #1
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Side radiator loud fan squeal

I started my coach yesterday, when the temp reached the point of turning on the hydraulic fan there was a very load squeal, sounded like a bearing. When the fan kicked off, the squeal went away. Does anyone know if this fan has a grease fitting, I have looked but not found one. It is a Cummins 400 ISL side radiator with a hydraulic fan and a Freightliner chassis. Has anyone changed this bearing or fan motor and how big a job was it? Thanks
Don
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Old 09-17-2013, 12:16 PM   #2
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Huh. I have been told that side rad fans were run by hydraulic oil or tranni fluid under pressure. If so that would explain why there aren't any zerk fittings. The bearings would be swimming in oil as it is.

Sorry I can't help beyond that but someone will be along soon that knows them better then I do.
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Old 09-17-2013, 01:07 PM   #3
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Thanks Jim, that is my impression also about the lack of grease fitting. Just wanted to reassure myself.
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Old 09-17-2013, 03:39 PM   #4
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I would be concerned that you may contaminate the fluid with a fan motor bearing failure, I would get that fixed ASAP as to not mess up the pump or power steering system. Just my $0.02. BTW, Easy to do. Confirm that it is the fan motor and not the pump by listening. It could be the pump making the noise under load, so I would rule that out before buying parts.

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Old 09-17-2013, 04:40 PM   #5
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Thanks Chris. The weather has cooled off here and now I can't get the temp up high enough for the fan to kick on. I ran it at fast idle for several minutes today and the temp would only get to the first hash mark (150 degree ?). I may have to take it for a drive to get it hot enough.
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Old 09-17-2013, 06:30 PM   #6
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The fan motor is purely hydraulic and has no replaceable bearings. When it makes noise it is gone. If it is a Sauer Danfoss you can check with the coach maker and get the correct matched motor. These are unique to each coach and can run for $600 to over $2,000 plus labor. If it is not replaced you might have a blow out because of the high pressure hydraulic operations and then you will need a tow, possibly a pump and the mercy of a shop who knows where.
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Old 09-17-2013, 10:03 PM   #7
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Not good news but thank you.
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