1955 Ford 640 crank pulley

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Old 05-18-14, 11:32 AM
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1955 Ford 640 crank pulley

Marksr or any others who care to take a shot, chime in. I was driving my tractor the other day doing some plowing when it overheated. Had plenty of coolant, so I was puzzled. Restarted it and noticed the alternator was not turning. OK, loose belt. Tightened the belt (not much) and restarted. That's when it all went south. The pulley separated from the hub on the crank. I have removed the 4 bolts on the hub but cannot get it past the manual crank mechanism. Do I need to support the engine and remove the fenders and the front axle to gain access or is there an easier way? I have the new pulley and it won't go on, even if I destroy the old one to get it off, so help if you can. Thanks.
 
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Old 05-18-14, 01:17 PM
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Welcome to real world of Ford "better ideas". The front axle and support will need to be removed from front of engine to provide access to front pulley.

Might be a way to get it by removing radiator???????

Have fun!

RR
 
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Old 05-18-14, 01:57 PM
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I looked,,and I just think that axle shroud support will still be in the way. Oh, well. I appreciate the input.
 
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Old 05-18-14, 03:02 PM
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Maybe it's time to upgrade to something new Larry? Like to a 1960 model?

Jeez...yer tractor is older than I am!
 
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Old 05-18-14, 03:12 PM
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Problem is, that it cranks every time, does what I tell it to do, and doesn't complain. Plus it is paid for I have priced new ones, or newer ones, and I like mine even better.
 
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Old 05-19-14, 03:17 AM
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The nice thing about those old fords is you can still get parts for them! Not sure you can say the same for some of the off brands that have been built in the last 20-30 yrs. About the only thing that would make me consider trading my 1953 NAA would be a 4x4 tractor..... and a 4x4 tractor with a FEL is too pricey for me.

Larry, do you have the IT manual for your 640? I've got one for my NAA which I think has the same engine, I'll look later and see what it says. If I remember correctly you have to remove the hood/fenders to remove the radiator. Shouldn't be too bad if you don't have a front end loader attached.
 
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Old 05-19-14, 06:02 AM
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I didn't see it mentioned in my IT manual but looking at my tractor it looks like the axle might have to be removed I replaced the center pin on mine a few yrs back and it's a job. I'd start by removing the sheet metal and radiator - maybe that will give you enough access.
 
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Old 05-19-14, 01:57 PM
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Do you need the manual crank to remove the pivot? I don't have one. I do have the IT, but it is limited on info. I have a searchable CD service manual on the way, so it may shed more on what I need to do. Yeah, I believe I will have to remove the axle, pivot and support. Thanks all!!
 
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Old 05-19-14, 02:47 PM
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I don't remember if/how I dealt with the manual crank fitting but I don't have a manual crank. I'd have to go back to the barn and look but doesn't it just slip thru a hole in the axle? The more I think about it, I'm not sure if I replaced the pin but I know I replaced the bushing .... just looked at my maintenance log - I replace the pin and bushing back in 1/08. I can't remember how long it took but it wasn't a quick easy job. Taking it apart was a bear, putting it back together wasn't too bad.
 
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Old 05-20-14, 01:20 PM
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OK, boys and girls, here's how it went down. Supported oil pan with jack and cribs. Removed shroud, radiator, fan, steering knuckles on axle, stationary braces on axle, then 4 nuts holding support unit to engine boss. Grabbed the cow catcher and pulled the wheels and axle out, exposing the crank. Piece of cake. No need to mess with the axle bushing at all. Took my guys about 2 hours. I supervised . Left off shroud for now. Gonna sandblast it, pressure wash the engine and paint shroud back to factory finish. Looks funky now, but it runs! Thanks for all the help.

Picture of new pulley in place and the 4 bolts that hold it all together.
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Old 05-20-14, 02:09 PM
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Glad you got her going

Took my guys about 2 hours. I supervised
That's cheating most every time I work on my tractor the crew of 3 consists or me, myself and I
sometimes the dog will supervise
 
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