WD snap coupler Boom
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Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=11879
Printed Date: 30 Jan 2025 at 2:28am
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Topic: WD snap coupler Boom
Posted By: ALinIL
Subject: WD snap coupler Boom
Date Posted: 03 May 2010 at 3:41pm
| Someone here mentioned a WD boom. Does anyone have a sketch or drawing to make a unit? Also what would be it's lift capacity at say 8ft. behind the rear tires(Approx 10 ft behind rockshaft). I'm looking to be able to lift 1000# at that point. Thanks - AL |
Replies:
Posted By: RickM(MO)
Date Posted: 03 May 2010 at 5:43pm
|
Al,
I mentioned I was looking for one also or the plans to make one. There's a picture of on on a CA in Norm's book but it doens't look it would work on a WD. It also mentions the WD version as having more lift capacity at 1,400 lbs. and cost $43.50 while the CA version would lift 650 lbs. and cost $25.75. ------------- Missouri Allis Chalmers Club Member; 1954 WD45 (NF), 611LTD & 811GT Lawn Tractors |
Posted By: TEDMI
Date Posted: 03 May 2010 at 6:11pm
|
Here is a picture of one I picked up a year ago.
TEDMI
 |
Posted By: Chris/CT
Date Posted: 03 May 2010 at 7:12pm
| I have the plans to build it. 10 ft out from rockshaft is NG. That boom on the WD/WD45 is at best out 5 ft from rockshaft. It will lift pretty good [depending on hyd's up to snuff] but it has it's limits. The 10 ft out would be a unsafe lift, along with stress on all the hardware. I guess if the load at 10 ft was small it may be OK. |
Posted By: ALinIL
Date Posted: 03 May 2010 at 7:49pm
|
Ted - Thank for the photo. Chris, I just figured it would lift pretty well, since we have
1-1/4 rams at 3000# for a total of 7500#. - AL
|
Posted By: NCAllisnut
Date Posted: 03 May 2010 at 7:59pm
|
It has been a while, but I think this is how you look at forces in this situation -
7,500 pounds of force from the cylinders times the roughly 9 inches from the short arm of the rock shaft to the center of the rock shaft would be 5,625 ft-lbs of torque on the rock shaft. A 1,000 pound load at 10 ft would be 10,000 ft-lbs of force in the opposite direction - the 1,000 pound load wins.
I hope I thought that through correctly, if not, I'm sure someone will chime in.
Adam
|
Posted By: CTuckerNWIL
Date Posted: 03 May 2010 at 8:12pm
|
Adam, I don't think it matters if your numbers are exact, it gets the point across. The next thing to think about is how fast this boom will come down when you bump the lever a bit. It is not a snap couple boom. It is only hooked to the lift arms. If they come down too fast at 2 feet behind the pivot point, think how fast it would move at 10 feet back. It would be a blur. I saw a cobbed up rear blade on a WD at a sale one time. It was mounted to the lift arms only. It raised way high like 5' off the ground. The guy shut the tractor of so the auctioneer could sell it and people started moving in toward the tractor about the same time the guy let the lever down a touch. That blade hit the ground in a fraction of a second. Luckily nobody got their foot under it. ------------- http://www.ae-ta.com" rel="nofollow - http://www.ae-ta.com Lena 1935 WC12xxx, Willie 1951 CA6xx Dad bought new, 1954WD45 PS, 1960 D17 NF |
Posted By: Dusty MI
Date Posted: 04 May 2010 at 7:56am
|
I had an AC scraper blade on my WD. The front wheels got broke off my IHC C 1/2 mile back from the shop. We hooked the front of the C to the back of the blade to bring it up to the shop. A friend had to ride the radiator of the WD to hold the front end down. Dusty ------------- 917 H, '48 G, '65 D-10 series III "Allis Express" |
Posted By: RickM(MO)
Date Posted: 04 May 2010 at 8:33am
|
Ted,
The one you have looks like the one pictured on a CA in Norm's book. Do you use it on a CA or a WD? Chris, Would you be willing to share the plans you have to make one? Thanks, RickM(MO) ------------- Missouri Allis Chalmers Club Member; 1954 WD45 (NF), 611LTD & 811GT Lawn Tractors |
Posted By: Chris/CT
Date Posted: 04 May 2010 at 11:04am
| I can get some copy's made, they are "rough" but helpful to build-it. I built one and it was pretty easy work. Had welding shop make the bends in the 4" C-Channel. |
Posted By: RickM(MO)
Date Posted: 04 May 2010 at 2:08pm
|
Chris,
Thanks for the offer on the plans. Rick ------------- Missouri Allis Chalmers Club Member; 1954 WD45 (NF), 611LTD & 811GT Lawn Tractors |