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John Deere Tractors Discussion Forum

FAN SHAFT 1941 B

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BILLY BLANKENSH

02-23-2004 16:09:59

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NEED HELP FAN SHAFT GEAR IS WORN OUT WHAT MAY HAVE CAUSED THIS WHAT DO YOU THINK CLOONEY

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John T

02-23-2004 18:12:36

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Re: FAN SHAFT 1941 B in reply to BILLY BLANKENSHIP, 02-23-2004 16:09:59

Billy, Im not clooney and dont know what he may think, but its my opinion many of those fan shaft gears got worn (seen many that way) due to lack of a good oil supply, mis adjustment (improper alignment, backlash, or heel/toe, bad governor bearings etc) and just plain old years of use. If you ran other loads off them or had maybe a bad generator or an imbalanced fan etc etc etc., such put even more load on them also. I have seen them so worn and sharp you could almost shave with them lol. I heard of guys who added an extra hole making an oil stream to better lubricate them which may help.

Anywho, its my opinion the wear is caused by poor oiling, misalignment, heavy fan shaft loads, and plain old use and maybe not the best design ever. It will be fun to hear other opinions and ideas.

Good Luck, God Bless ya Billy

John T

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BILLY BLANKENSHIP

02-24-2004 13:23:15

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Re: Re: FAN SHAFT 1941 B in reply to John T, 02-23-2004 18:12:36

JOHN T AND COOLEY HOW DO I GET MORE OIL FLOW TO GEAR THANK YOU

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RUSS

02-24-2004 14:05:03

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Re: Re: Re: FAN SHAFT 1941 B in reply to BILLY BLANKENSHIP, 02-24-2004 13:23:15

Billy ... I replaced my fanshaft in my 1948 JD B
and I know its last few minutes were withou oil flow. Started it in late November and there was ice formed in the bottom. Pickup wasn't picking up and right camshaft end seized in the plain bearing. Camshaft snapped off. The fanshaft was wobbling (prelating) for a damaging while leading up to the failure. My fanshaft bevel gear in the governor was quite peaked in the tooth (sharp).
I forgot to mention the oil feed tubing to the right camshaft plain bearing had broken off from engine crankshaft throw was whacking this tube.
All of this is not normal from the factory.
Just make sure your engine oil 30W or 10W-30 is up to the tell tale.
Replace your fanshaft if you must but it is not
a 2 hour job even with tea and crumpets. Good Luck.

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Clooney

02-23-2004 18:05:24

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Re: FAN SHAFT 1941 B in reply to BILLY BLANKENSHIP, 02-23-2004 16:09:59

Billy, while there's no way to know for sure what caused that wear but the usual cause of worn fan gears is hours & hours & hours of use..

~Things that can contribute to accelerated fan gear wear are.. Poor governor oiling, excess gear lash at set-up time, incorrect heel position at set-up time, excessive generator load for long periods, frozen up fan friction clutch, governor bearing wear or governor bearing bore case wear, too much heat used to remove the driven gear at service time, long periods of engine lugging... Probably just lots of hours on the gears was the biggest reason for the wear..

~You should probably check the fan friction clutch, check the governor bearings & R/H governor case bearing bore for excess wear.. Then check the governor & gear area for proper oiling..

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