JD #7 BACKHOE SWINGS TOO FAR L/R

[rlinwood]

New to me is a 1983 JD750 equipped with a loader and JD #7 backhoe.

At issue:
The JD #7 backhoe will swing so far to the left or right
that it hits the hydraulic connectors on the control box and fractures them.

I have all the hoses and connectors intact again
but would like to understand the "where" to adjust the scope of swing.
It is possible there are pieces missing for this adjustment.

Question 1 :
Anyone have any photos and/or experience on how/where to fix this issue so I can avoid further expensive mistakes?

Question 2 :
Anyone know of a source for seat-related parts for this backhoe?
The former owner also took the entire seat (complete bracket assembly and all) off and disposed of it all.

Thanks

 

[DennisFolsom]

My JD 48 backhoe also has rubber bumpers, though they are a little different than K7LN showed us.

My guess is that yours had bumpers, which are now missing.

I am now using a seat from Tractor Supply on my backhoe. It's a bit nicer seat than the original type. In my case, I had the bracket assembly, but the original seat had some cracks in it. You might be able to adapt a hinged seat bracket from something else - a junked garden tractor, for instance. Northern Tool lists a seat that looks just like the original type for my 48. Tractor Supply had seats, but they were not quite as close to the original type.

I would have bought the seat at Northern Tool, but my son got me the nicer one from Tractor Supply as a gift.

 

[rlinwood]

They say a picture says 1000-words. So true here.
I have the rubber bumpers but the bracket on the backhoe arm appears bent compared to yours.

 

[rlinwood]

I suspect that I will need to purchase the piece parts and assemble the seat brace as there is nothing there at all currently.
Is there a junk yard out there for more complete assemblies that you've heard of ?

 

[rlinwood]

Interesting... so those flat components are non-standard aftermarket additions.
Revisiting that photo you had (above), I do not see bolts hanging out those stops.
Mine seems to have bolts inserted.
So it appears that someone:
- welded some type of flat steel support onto the side of the arm and then
- inserted bolts into those standard stops to make adjustments but
- one of those added bolts is missing and
- the other bolt appears pretty bent

Confirming that your #7 does not have those flat adds on it?

 

[Mechanos]

Interesting... so those flat components are non-standard aftermarket additions.
Revisiting that photo you had (above), I do not see bolts hanging out those stops.
Mine seems to have bolts inserted.
So it appears that someone:
- welded some type of flat steel support onto the side of the arm and then
- inserted bolts into those standard stops to make adjustments but
- one of those added bolts is missing and
- the other bolt appears pretty bent

Confirming that your #7 does not have those flat adds on it?

Actually, the title of your post is not correct.... you hoe actually does not swing far enough. Should swing 180 degrees side to side.

Looks to me like some damaged, tweaked, cracked or broke the boom at one point and did a completely ammeaturish, jack-leg, mess of a repair job that has caused more problems than it's solved. It's blatenly obvious what is OEM factory and what is jack-leg hack job.... and all that crap on the side of your boom is hack.

 

[burnieman]

Actually, the title of your post is not correct.... you hoe actually does not swing far enough. Should swing 180 degrees side to side.

Looks to me like some damaged, tweaked, cracked or broke the boom at one point and did a completely ammeaturish, jack-leg, mess of a repair job that has caused more problems than it's solved. It's blatenly obvious what is OEM factory and what is jack-leg hack job.... and all that crap on the side of your boom is hack.

You're gonna burst his bubble with all that honesty. Don't sugar coat it. Tell him what you really think about his abortion looking repair job!

 

[boggen]

i could of sworn last year, john deere website, had a online parts manual, with diagrams you could look through. but entering 750 or 7 or backhoe just returned nothing found.

and trying to find just manuals ended as ugly dead ends of JD trying to sell manuals but no pricing listings for manuals. Yikes!

you might have better luck
John Deere Home Page Redirect goto us/canada then goto "parts" and then middle of page "parts catalog"

 

[Mechanos]

When you go to the JD parts catalog website, click the button at the top of the screen for "catalog number search" or whatever it is. Enter catalog number 1969.

 

[SwLWildcat]

try this link for the parts catalog...

John Deere - Parts Catalog

 

[rlinwood]

Great info.
Wellll - okay - this explains a lot.
Yup looks like a re-engineering job is awaiting me on this one.
I noted on the photos that it appears there is also a missing cover for the connectors on the black control-lever box. Might you be able to send a photo or two of both sides of that box?
The thought that those bars were welded on to fix a stressed arm bugs me.
The engine has about 830 hours on it and that backhoe must have had all of them.
It see dried concrete splattered around the grill and bucket area and wonder if that may have related to the backhoe use, too.
Thanks guys for your input. This is invaluable to me.

 

[ptgdigger]

I could be wrong but I don't think the boom was damaged, looking at the pics I think it all comes back to a damaged cylinder on the main boom, original owner breaks/bends the cylinder , prices a Deere cylinder and says "no way!" Orders a close match for pin holes and stroke , but the big end on the tie rod cylinder won't fit in the boom, so they weld on these "extensions" to move the lower pin hole outside the boom. Now that big ugly cylinder fits ! Only when they swing the hoe to the stops they realize they have a problem and try to extend the swing stops, (note in the photos the original stops are still intact), but the extended stops bend and you cream the hoses.

So I'm guessin you put a deere cylinder back on it and cut all the cabbaged up junk off the boom you no longer have a problem.

Ray

 

[kennyd]

Interesting... so those flat components are non-standard aftermarket additions.

This may sound rude, and I don't mean it to be...but how the heck can you look at those welds and think that is factory? That looks like such a blatant hack job, it would have kept my from buying this machine altogether.

 

[ptgdigger]

K7LN , on those control pics you just posted - what is the purpose of the restricted joystick ? to prevent an accidental swing when backing in the garage and lowering the boom maybe ? just curious.

Ray

 

[Mechanos]

K7LN , on those control pics you just posted - what is the purpose of the restricted joystick ? to prevent an accidental swing when backing in the garage and lowering the boom maybe ? just curious.

Ray

Why do tractors have seat switches? One word.... lawyers. It's their responsibility to protect us from ourselves you know. Heaven forbid that anyone would be responsibile for their own actions.

 

[rlinwood]

Been away a bit due to illness in family.

Starting to work on the tractor again - it appears that the former owner did attempt to "beef up" the #7 Backhoe with the aid of his welding equipment.
Both ends of the primary arm cylinder have been modified with double layer steel.

I have not found any evidence of metal fatigue or failure - just the second layer of steel reinforcements (see attached photos).
At this point, I will weld some new braces on the arm to prevent it from swinging to far in and trashing the hydraulic hoses and/or connectors (been there, done that).

Since he had removed the #7 backhoe seat (and all supporting brackets and components) I would like to replace those.
Anyone have any ideas where I might find a complete seat assembly?

Thanks again for your input on this board.... extremely helpful.

 

[XSKIER]

Ahh, now I understand. Those "beef ups" were made in order to mount that silly looking farm supply cylinder in the dipper stick position. I'll bet if you got ahold of the guy who did that he'd whip you up a fine looking seat!

 

[XSKIER]

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