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Generators In this forum we will try to answer any of your questions about the different model generators that can be found on Blue Bird coach's.

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  #11  
Old 07-26-2013
Mallie Lennon's Avatar
Mallie Lennon Mallie Lennon is offline
1995 WB 42’ Series 60
 
Join Date: Jan 2011
Location: Eufaula
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Quote:
Originally Posted by Jim Brookshire View Post
Just a note from doing some work replacing a fan motor at Oshkosh several years ago. Make sure that you look carefully at the mounting supports. Many of the replacement home ACHV fan motors have brackets that will not stand the shock and vibration that happens with over the road operation. We had to replace a motor that had been installed and the brackets had allowed the fan wheel to contact the housing. If you can find a bare motor and reuse your existing brackets (which look very strong) that would be best.
Good point Jim. the standard motor is 5 5/8 with a 1/2 shaft. Lot of the replacement brackets are just heavy wire.
And mark the bracket so you get it in the same place on the new one, and make sure the wheel is as close to the motor as possible.
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  #12  
Old 07-23-2018
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louh louh is offline
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Location: Thousand Oaks
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I know this an old thread but wanted to put my findings in here for future reference of anyone searching for this. I just replaced the generator squirrel fan in my 87 PT40 . The original fan was a GE 5KCP39KG . I originally went to replace it with a Marathon X003. When it arrived the motor wouldn't even turn so I returned it. It would have worked though as it did fit my fan shroud and mounting hardware. Instead I went to Grainger and purchased a Dayton 4M099 which looks about identical in size and shape to the X003. They both have the same specs as well. It bolted right in and worked great. I did have to change the run capacitor from my original GE fan. No biggie though. I also replace the squirrel fan itself since I was at Grainger and they had one. I used a 2UTW1
that measured Wheel Dia. (In.)11 Wheel Width (In.)10-5/8 . It was an exact replica of the original. It comes balanced and ready to bolt in. With a new 2MDV4, 5 microfarad 370v capacitor, and it runs smooth and cool!
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Thousand Oaks, CA
1987 PT40 "UFO"
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  #13  
Old 07-23-2018
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Dieselbird01 Dieselbird01 is offline
John Wyatt – Administrator/Moderator
 
Join Date: Feb 2008
Location: Titusville
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Thanks Lou!
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Titusville, Florida
1991 40' WLWB-WTB
Body Number F095567
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1991 40' WB ...From 2008 - Present
1984 ½ PT-36 .From 2000 - 2008
1973 FC-31 .....From 1991 - 2001
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  #14  
Old 07-24-2018
Butch Charpentier Butch Charpentier is offline
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Join Date: Jan 2008
Location: Syracuse
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Stop screwing around with that old squirrel cage. Rip it out and replace it with a 16 inch 3000 cfm 12 volt fan wired thru a Bosh relay that turns on the electric from the hour meter.
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  #15  
Old 07-24-2018
mrkane mrkane is offline
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Join Date: Jan 2008
Location: USA
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Quote:
Stop screwing around with that old squirrel cage. Rip it out and replace it...
There are a number of reasons why this was a poor choice for my coach.

The most important was the available 12 volt power: DC power on my coach comes from the battery bank, the battery charger, or the alternator on the 8V92 DD. (The generator has no 12 VDC alternator.) The main engine alternator is ~160 Amp rated.

Coaches of this era came with separate inverters and chargers. My charger is a Truecharge40.

The maximum current draw for the squirrel-cage motor is ~2.5 Amps at 220 VAC, while the pancake fan typically draws about 15 Amps at 12 VDC.

Therefore, if operating the generator with the DD not running, the current available for charging the batteries and other applications would be substantially reduced by a 12 VDC radiator fan.




--M.R.Kane
1987 PT40 'Sleipnir'
currently near Elmo, TX
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