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Re: Case/Davis trencher backhoe
Posted: Fri Apr 28, 2023 8:11 am
by RoamingGnome
I was curious where you had posted your questions -
- they popped up briefly on FB (It does that sometimes when someone you know makes a post on a group you aren't a member of yet) but I couldn't find them on any forums or FB Case/Ingersoll groups...
Thanks for the update, and looking forward to reading more about your trencher progress...
Re: Case/Davis trencher backhoe
Posted: Fri Apr 28, 2023 8:53 am
by Eugen
RoamingGnome wrote: ↑Fri Apr 28, 2023 8:11 am
I was curious where you had posted your questions -
- they popped up briefly on FB (It does that sometimes when someone you know makes a post on a group you aren't a member of yet) but I couldn't find them on any forums or FB Case/Ingersoll groups...
Thanks for the update, and looking forward to reading more about your trencher progress...
Thanks Gerry! The group came up on a google search I did for manuals, it's called "Davis (Case) Taskforce 200/300 trencher" and it seems to be the only group for such devices, so people post pictures of all Case/Davis trenchers. It's not a big group, as you can imagine.
Re: Case/Davis trencher backhoe
Posted: Fri Apr 28, 2023 11:07 am
by Eugen
The rods are done. Very nice machining, I'd never have been able to get such good finish on them.
Seeking advice. How would you prepare and weld the eye on the end of the rod? Also, what process, stick or mig? If stick, dc and 7018?
Re: Case/Davis trencher backhoe
Posted: Fri Apr 28, 2023 1:21 pm
by DavidBarkey
Eugen wrote: ↑Fri Apr 28, 2023 11:07 am
The rods are done. Very nice machining, I'd never have been able to get such good finish on them.
039AA02E-C69F-4885-ABA9-45D62BE61245.jpeg
Seeking advice. How would you prepare and weld the eye on the end of the rod? Also, what process, stick or mig? If stick, dc and 7018?
Stick , and protect the chrome with header rap and a pipe over it . I have some rap you can borrow . Grind the end to mirror the tube end to be welded on . Leave a small gap ,about a 1/16th on an inch. Tack in place at each end , you can use your mig for this . First pass at he bottom (root), clean slag and then flip over and then do first pass (root) on other side . The idea is to have the second root pass bite into the bottom of the first . Then start filling in the gap between rod and rod end . Do a pass on each side , clean slag and repeat until the weld is slightly larger than the rod .
As for what rod to use , I would use 7018 because that is what I know . Harry would be able to give better insights on this .
Re: Case/Davis trencher backhoe
Posted: Fri Apr 28, 2023 3:54 pm
by Eugen
Thank you Dave!
Tried the dozer. What 15hp can do with the right transmission and good traction is quite amazing.
https://vimeo.com/822142463
Re: Case/Davis trencher backhoe
Posted: Fri Apr 28, 2023 4:29 pm
by DavidBarkey
. If that is with 15 hp imagine what would it do with full hp . How much is full hp ?
Re: Case/Davis trencher backhoe
Posted: Fri Apr 28, 2023 5:34 pm
by Eugen
Not sure Dave, the original engine was an Onan J60, also called the Onan JB. Probably somewhere between 20 and 30 I'm thinking.
Re: Case/Davis trencher backhoe
Posted: Fri Apr 28, 2023 6:10 pm
by JSinMO
That’s really cool
@Eugen !
I’m looking forward to seeing the backhoe on it digging away!
Re: Case/Davis trencher backhoe
Posted: Fri Apr 28, 2023 8:24 pm
by Harry
DavidBarkey wrote: ↑Fri Apr 28, 2023 1:21 pm
Eugen wrote: ↑Fri Apr 28, 2023 11:07 am
The rods are done. Very nice machining, I'd never have been able to get such good finish on them.
039AA02E-C69F-4885-ABA9-45D62BE61245.jpeg
Seeking advice. How would you prepare and weld the eye on the end of the rod? Also, what process, stick or mig? If stick, dc and 7018?
Stick , and protect the chrome with header rap and a pipe over it . I have some rap you can borrow . Grind the end to mirror the tube end to be welded on . Leave a small gap ,about a 1/16th on an inch. Tack in place at each end , you can use your mig for this . First pass at he bottom (root), clean slag and then flip over and then do first pass (root) on other side . The idea is to have the second root pass bite into the bottom of the first . Then start filling in the gap between rod and rod end . Do a pass on each side , clean slag and repeat until the weld is slightly larger than the rod .
As for what rod to use , I would use 7018 because that is what I know . Harry would be able to give better insights on this .
I agree with David’s suggestions.
Harry
Re: Case/Davis trencher backhoe
Posted: Sat Apr 29, 2023 6:28 am
by DavidBarkey
Eugen wrote: ↑Fri Apr 28, 2023 5:34 pm
Not sure Dave, the original engine was an Onan J60, also called the Onan JB. Probably somewhere between 20 and 30 I'm thinking.
look on page 4-5
https://issuu.com/kmd9isb5nvmk/docs/cum ... ervice_rep
21.6 hp @ 2700 rpm
That 15 @ 3600 rpm is not to far off . If the pump you have on there is a little smaller cid than the original . You can use the extra rpm of that engine to compensate . Just might be a little slower over all , but should work just fine .