Wrecker Broken CV Joint

[wcuhillbilly]

Wrecker Broken CV Joint, The Golden Driveshaft Crane Drive

Lost my lower CV joint on the Power divider last nite with the boom at full extention and at a 45* to the truck... was setting my pickup bed back on the rails....

Ok, we know the CV is a POS and a real PITA and its made of Unobtainium.
Does anyone know of a commercial truck application that could be retro fitted inplace, Hydraulic or shaft driven?
I am puttin in an Eaton Trans next year so the T case is being moved back, Now sounds like a good time to remove the extra tunnul off the Pwr divider and either go hydraulic or re config the shaft with a coulple support carriers.
Could the 936 system be retro fitted in with some machine work... or does anyone know the specs on the 936 drive system, torque, fluid cap, rpm etc. I have a competent machinist in my pocket, so fabrication and mill work is availible.

Read on to Page four for the final outcome, This shaft off the Tulsa/Garwood power divider will cost around $2,000 from the MV suppliers, IF you own an M816 with this crazy expensive or obsolete system you will at some time end up replacing this shaft.
Basically I dropped one extension housing off the power divider. Had a machinist neighbor mill an endcap, shaft with bearing/seal and oil drain back hole, for the extension housing and fit a keyed flange on the shaft/end cap. From here we took a high angle yoke for a 1330 series (1/2 ton GM or ford) U joint, which allows for up to a 30* angle and welded up the 12 spline existing CV crane shaft to be turned down and cut for 16 spline to fit in the yoke. this makes a slip yoke to ease installation and allows operation at the new angle of 26* up to the union by existing old style CV at the crane drive under the Turret.

 

[swbradley1]

Modified title, it sounded like you were broke down and needed emergency help.

 

[Jakelc15]

You could pull the yoke from your PTO and replace it with one with a newer series u-joint. It's a 10 spline standard size, any driveshaft shop should have. I don't know what the power divider has though.

 

[Jakelc15]

Spicer yoke for transfer PTO end. I'd pull your yoke to check and make sure this is correct.http://www.northerndrivetrain.com/product/SPI-3-4-1501-1.html
http://www.parttarget.com/2520-00-8...19.html/-6B9E4FE9-005F-4EDE-98B0-59272C3A6D14

 

[wcuhillbilly]

Top pic is overall, second is the model plate, Tulsa Transmission Mod: ORD7413950 Serial: G17916 Assembly: 61675

Parttarget brings up additional part numbers.
2520007413950
KC2769
M306098
112009R91
7413950
Im sure some oilfield truck has got one of these in some configuration.

I have removed the 2 extension housings and the oval box, I would like to drop these housings and install a U joint flange at the case then start the shaft up to the crossmember with a carrier bearing and another shaft up to the crane drive.

 

[red]

Couple pics of the underside of my m816 (should be the same). 1st pic is the underside of the crane, the PTO shaft in the middle.





This pic is the output side of the power divider, the crane PTO is the lower part. The PTO shaft connects to the yellowish box to the left

 

[wcuhillbilly]

Thanks Red, Im trying to upload pics from my phone, and type on the computer. not working... had a nice explanation typed out, but the system kept cycleing till it dropped my text and barely uploaded one pic.

 

[red]

And now it's uploaded your pics/details. Computers love you hahaha

 

[Jakelc15]

OK. Now I see what is broken. When you said everything stopped, I assumed it was the PTO to power divider shaft. I didn't know the hoist drive line was so intricate.

You need a hydraulic swivel like newer wreckers. You could mount the pump right off the power divider and run the 2 lines up through the swivel into the wrecker body.
Or run a second hydraulic system. PTO runs a pump, hydraulic motor drives wrecker pump. Also use it to power the winches. The front winch shaft isn't going to fit after the tranny swap anyway!

Just some ideas. I think you have it figured out already with removing the extensions and eliminating the obsolete parts.

Sent from my SPH-L710 using Tapatalk

 

[adamsoffroadperformance]

with some machine work you use 2 cv joints from a ford truck driveshaft they should do the job no problem and are very common

 

[Jakelc15]

with some machine work you use 2 cv joints from a ford truck driveshaft they should do the job no problem and are very common

Don't use ford parts if you want it to work!

 

[wcuhillbilly]

Don't use ford parts if you want it to work!

yes, Im trying to avoid using inferior tactics.... My machinist neighbor looked at it last nite and thinks we can drop the bigger extension housing but due to the shaft coming out of the Pwr Div I will likely have to keep the smaller housing in order to fit a milled end cap/bearing retainer and yoke onto. the shaft coming out of the div is female woodruf key (Edit: The female part is a coupler that is held on with an allen screw, it will come off yielding a male shaft with woodruff half moon key.) inside the smaller housing, thus if he mills a cap for it with a bearing/oil seal and a shaft(could cut down the other shaft) then we can go with a OTR truck PTO U-joint and start the process up to the crane pot.
I really would like to convert to the Hyraulic setup off an 936 but out here in podunk Wyoming there just are not very many resources to pic from.... not to mention I would need the crane operational to pluck said unit off another truck...
I tried to dig up some info on the Tulsa/Garwood pwr divider but it too is made of unobtainium, and the truck shops want me to drop it and bring it in, sure I will get right on that..... I am betting that since the rear winch output is a U joint, then the lower one for the crane would have come as a U joint as well, but since the engineers at the US army got ahold of it, the conversion was made to the "new and improved CV joint"... I was trying to find the output shaft and bearing retainer to convert the lower shaft to a u joint with factory components. but no such luck....

 

[EO2NMCB]

Keep us posted as to what you come up with to repair it, as I'm sure its a ticking time bomb for other m816 owners.

 

[adamsoffroadperformance]

Don't use ford parts if you want it to work!

Haha well if you think about the ford cv's are made by spicer which makes most all manufacturers driveline components as also makes the driveline components in the 5ton trucks so your anti ford comment is in valid.

 

[adamsoffroadperformance]

https://www.google.com/search?q=5to...=q0EXWLX9IcG3jwSR8pqoDg#imgrc=hxcjUX_32MUCdM:

 

[adamsoffroadperformance]

this is what you need. military grade green. lol and it's the same as a ford style cv I was talking about and is sold by Fort Wayne Clutch as seen in the pic. https://www.google.com/search?q=5to...=q0EXWLX9IcG3jwSR8pqoDg#imgrc=JCE-L2KpuUDA5M:

 

[Jakelc15]

Ford had Spicer make a special size oddball joint just to keep things from being interchangeable. I think it's the 1330F. Changed the cap size slightly. They didn't use to make conversion joints and I had to buy 2 joints and switch the caps to fit Ford axles under Jeeps!

Sent from my SPH-L710 using Tapatalk

 

[adamsoffroadperformance]

the Ford Cv used a standard 1330 or 1310 joint. they only used an odd joint at the axle end which he does not need. he just need the cv

 

[Jakelc15]

Could probably find it easily in a junk yard if you have one nearby. Save some $ Good to know what it was used on.

 

[adamsoffroadperformance]

the one in the pic comes up if you google 5ton m939 CV so it was used for something. I've come across them on other parts dealers websites so they got them surplus