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My David Bradley "fails"

sickle mower david bradley

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#31 Lauber1 OFFLINE  

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Posted August 31, 2012 - 01:13 AM

Seems like to me that some place in the manual it talks about when changing the pulley to speed up the drive, you should back the throttle off to just above idle. This is also supposed to help with the mower shaking the machine so much. If your tractor dont have the orginal pulleys you might want to think about getting an 1 1/2 for the ground drive and a 2 1/4 for the mower drive. i think this would slow it down some. You could also look for the slow speed pully setup for the ground drive.
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#32 Amigatec OFFLINE  

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Posted August 31, 2012 - 03:10 AM

Alan may have a Continental AU7 or AU7B which is on a model 917.5756, if not the AU8 found on 917.57561.


Possibly but the 5756 is a lot harder to find, I have one. Finding an AU7 to put on it was a real problem. The 5756 was only made in 1950, and then probably not for the full year. The AU7 I finally bought is not off a DB, but it will have to work. The AU7 was either 1.6 or 1.8 hp.

The 57561 had the 2 1/2 hp AU8, and was built from 1951 to 1953. The AU8 motor I have has 53 written on the cover which is probably the year of the motor.

The "Super 3" tractors had an AU85, they were 3 hp, and there 4 models made, 3 of those were Bronze hoods with Creme wheels. I believe they were built from 1954 to 1957. I think there were a couple of other DB's to use these motors as well.

#33 wvbuzzmaster OFFLINE  

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Posted August 31, 2012 - 12:29 PM

My first David Bradley was a 5756 with no motor and the earlier in the series so it needed an AU7. I had to settle on an AU7B when I restored it in 2006. Last year at the Dover, PA show I ran across an AU7 with DB pulley on it for sale and grabbed it up in case I want to repower my 5656 to the correct engine. So it took 5 years to get the AU7.

#34 Amigatec OFFLINE  

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Posted August 31, 2012 - 02:18 PM

What's the difference between an AU7 and an AU7B?

#35 HowardsMF155 OFFLINE  

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Posted August 31, 2012 - 03:35 PM

Alan, that video was painful to watch.....If only because it kept reminding me of some of my own adventures! I've never had a DB, but I have struggled with a Gravely sickle mower. Supposedly, it doesn't take a lot of power to run a sickle mower, but something is really doing a number on your engine. As everyone else has said, it is certainly running too fast, several times it looked like you were trying to hold it back. First thing I would want to check is to see if the engine simply lacks power. Could you attach another implement? Someone also told you to try flipping the double pulley around for a slower ground speed and a faster implement speed. I've never seen a sickle bar running especially fast; I know Gravely recommends only running the engine at a fast idle. so I don't think I would take any action which speeds up the mower.
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#36 wvbuzzmaster OFFLINE  

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Posted August 31, 2012 - 07:04 PM

What's the difference between an AU7 and an AU7B?


From what I have found in the past is the AU7 is 1.6 hp and the AU7B is 1.8 hp (or something like that). So it is a hp thing I guess.

#37 Amigatec OFFLINE  

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Posted August 31, 2012 - 07:09 PM

The AU7 I have has an air vane governor instead of the mech unit.

#38 wvbuzzmaster OFFLINE  

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Posted August 31, 2012 - 07:26 PM

Alright, it irritates me enough that I am going to dig the AU7 out and set it next to the AU7B tomorrow. I know the AU7B has air vane governor so not sure about the AU7, but thinking it might be different now..

#39 Amigatec OFFLINE  

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Posted August 31, 2012 - 07:31 PM

DanO in New York has a 5756 with AU7, and his has the mech gov. I was studying his ideo to figure out ow to hook the throttle cable up. Also the the AU7 manual shows a Mech gov.

#40 wvbuzzmaster OFFLINE  

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Posted August 31, 2012 - 08:32 PM

Ya, i think that is the difference.

#41 drbish ONLINE  

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Posted September 01, 2012 - 06:32 AM

http://gardentractor...cooled-engines/

#42 Amigatec OFFLINE  

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Posted September 01, 2012 - 07:06 AM

I'll have t look at mine, since the later models had the mech gov, mine must be a AU7 and not a AU7B. It has the tag so I can see what it says.

#43 drbish ONLINE  

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Posted September 01, 2012 - 07:11 AM

my AU8B has mechanical governor

#44 Amigatec OFFLINE  

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Posted September 01, 2012 - 07:32 AM

OK I took some pictures. Both of mine are not the "B" models. the AU7 has spec 53 with airvane, and the AU8 has spec 127.300 (Sears DB number) and has mech gov

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#45 Amigatec OFFLINE  

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Posted September 01, 2012 - 07:38 AM

It seems they can come either way. The manual is showing both types of govs.





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